Wednesday, 2 January 2013 - Annual Climate Summary for Western Australia - Product code IDCKGC11R0
Rainfall in WA during 2012 was near average for the State as a whole, but below average for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay). Wet months in November and December in the Lower Southwest meant that annual rainfall in the region during 2012 was below average, but not in the lowest 10 per cent of records, after a very dry autumn and winter.
Maximum temperatures were well above average for WA as a whole, with the State recording its ninth-warmest year on record. Very much above average maxima were also observed in the Lower Southwest, which recorded its second-warmest year on record only behind 2010. The Lower Southwest has seen a persistent run of above average monthly temperatures for over three years, with only two below-average months since October 2009. Since comparable annual records commenced in 1910, five of the seven hottest years in the Lower Southwest have occurred since 2006.
Averaged across WA as a whole, rainfall during 2012 was near average. The Southwest Land Division (SWLD) and Eucla recorded below- to very-much-below-average rainfall during 2012, whilst large parts of the Kimberley, east Pilbara, and Interior recorded above- to very-much-above-average rainfall. Wet months were observed for WA as a whole in January (sixth-wettest) and November (eleventh-wettest); while May (fifth-driest), July (third-driest), and August (tenth-driest) were in the lowest 10 per cent of records since 1900, mainly due to low rainfall over southern WA during these months. As a result of the relatively dry months in the middle of the year, WA recorded its third-driest April to October period. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) saw below-average rainfall during 2012, largely as a result of registering its eighth-driest autumn, and eighth-driest winter, which included the driest July for the region since comparable records commenced in 1900. The final two months of the year in the Lower Southwest saw very-much-above-average rainfall, with November ranking as eleventh-wettest on record and December sixth-wettest, thus the NovemberDecember period was fourth-wettest on record and elevated the annual rainfall total in 2012 above the lowest 10 per cent of records. January to October rainfall in the Lower Southwest was ranked seventh-lowest.
Significant rainfall events during the year were as follows:
Averaged across WA as a whole, maximum temperatures during 2012 were very-much-above-average, ranking as the ninth-highest on record. Much of the State recorded above- to very-much-above-average temperatures, with areas of highest on record in the Eucla, southern SWLD, west Gascoyne and northwestern Central West, with a number of sites observing their warmest or equal-warmest year on record. The only region of WA to see a below-average 2012 was the southeast Kimberley. Monthly mean maximum temperatures for WA were below average at the start of the year, but were consistently above average from April to December, and WA recorded its third-warmest April to November period since comparable records commenced in 1950.
The Lower Southwest saw very-much-above-average maximum temperatures, recording its second-warmest year since comparable records commenced in 1910, only behind the record set in 2010. The very-much-above-average year was largely due to an above-average January, a very-much-above-average autumn (fifth-warmest), and consistently above-average maxima from July to October. The Lower Southwest has seen a persistent run of above-average mean monthly maximum temperatures for over three years, with only two months below the average since October 2009. Also of note is that five of the seven hottest years in the Lower Southwest, since comparable annual records commenced in 1910, have occurred since 2006.
Significant maximum temperature events during the year were as follows:
Averaged across WA, minimum temperatures were near average, while for the Lower Southwest, overnight temperatures were above average during 2012. Much of western and southern WA reported above- to very-much-above-average annual mean minimum temperatures, whilst the Kimberley and large parts of the Interior reported below- to very-much-below-average minima.
The year began with relatively low minimum temperatures across much of the State with monthly mean minima averaged across WA below average from January to August, including the fifth-coolest May and the coolest July on record, before state-wide overnight temperatures warmed during the latter part of the year and WA recorded its third-warmest spring since comparable records commenced in 1950. For the Lower Southwest, overnight temperatures were generally above average in most months. January 2012 was the warmest January on record for the Lower Southwest, whilst only May and July saw below-average monthly mean minima.
Eyre in the Eucla district observed its lowest annual minimum temperature in 46 years of record, with an average overnight temperature of 9.3 °C, 0.5 °C below the previous record. This is remarkable given Eyre also recorded its warmest year in terms of the mean maximum temperature; however, 2012 was a relatively dry year at the site suggesting a lack of cloud ensured good conditions for day-time heating, as well as night-time radiative cooling.
Significant minimum temperature events during the year were as follows:
|Extremes in 2012|
|Hottest day||47.3 °C at Emu Creek Station on 23 Dec|
|Warmest days on average||35.7 °C at Fitzroy Crossing Aero|
|Coolest days on average||20.8 °C at Albany|
|Coldest day||9.8 °C at Mount Barker on 4 Sep|
|Coldest night|| -4.2 °C at Yeelirrie
on 7 Jul
-4.2 °C at Warburton Airfield on 8 Jul
|Coolest nights on average||8.5 °C at Collie East|
|Warmest nights on average|| 23.7 °C at Varanus
21.8 °C at Wyndham
|Warmest night||32.7 °C at Emu Creek Station on 24 Dec|
|Wettest overall||1723.2 at Doongan|
|Wettest day|| 260.6 mm at Troughton
Island on 14 Mar
244.0 mm at Home Valley on 13 Mar
|Highest wind gust||146 km/h at Cape Naturaliste on 10 Jun|
|Record highest daily rainfall|
Highest daily rainfall
in 2012 (mm)
|Collie||157.2||on 13 Dec||118.4||on 21 Jan 1982||109|
|Warner Glen||106.4||on 1 Jun||104.4||on 14 Jan 1954||63|
|Tamaru||116.2||on 2 Jun||112.7||on 2 Aug 1992||47|
|Kimberley||88.2||on 1 Jun||84.6||on 1 Apr 1983||44|
|Alexandra Bridge||107.2||on 1 Jun||82.0||on 27 May 2010||42|
|Record highest annual mean daily maximum temperature|
Mean daily maximum
for 2012 (°C)
|Narrogin||23.6||= 23.6||in 2010||81||22.4|
|Carnarvon Airport||28.9||= 28.9||in 1988||64||27.2|
|Esperance||22.7||= 22.7||in 1983||42||21.8|
|Record highest daily minimum temperature|
Highest daily minimum
in 2012 (°C)
|Hyden||26.5||on 2 Feb||26.3||on 5 Jan 1977||42||9.9|
|Record lowest annual mean daily minimum temperature|
Mean daily minimum
for 2012 (°C)
|Month by month|
An active monsoon across the north of WA, the passage of tropical cyclone Heidi across the Pilbara, and the influence of tropical cyclone Iggy off the west Pilbara coast, resulted in above- to very-much-above-average rainfall for much of the State during January 2012. A number of sites in the west Kimberley, Pilbara, and north Gascoyne registered their wettest January on record. Very heavy and persistent rainfall was observed in the west Kimberley between the 26th and 29th where Cygnet Bay and Cape Leveque both recorded 4 consecutive days of rainfall over 100 mm, an unprecedented event in WA weather recording history. Both sites recorded January daily rainfall records as a result of this event.
Maximum temperatures in WA during January 2012 were much cooler than average over large parts of central and northern WA, but above average near the west coast. When averaged over the State, January 2012 was the third-coolest January on record. Minimum temperatures followed a similar pattern, with cooler-than-average temperatures in central and northern parts, and warmer-than-average nights in western and southern areas. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) experienced its hottest January in terms of overnight temperatures.
|Rainfall rank||Maximum temperature rank||Minimum temperature rank|
Rainfall during February 2012 was near average for much of WA. Below-average rainfall was observed in the north of the State due to a break in the wet season, whilst the eastern Eucla also saw below-average rainfall. Above-average rainfall was observed in the southwest Gascoyne and parts of the Southwest Land Division (SWLD), particularly near the west coast, mainly due to the passage of ex-tropical cyclone Iggy early in the month. Above-average rainfall was also reported in the central Interior.
Maximum temperatures were near normal across much of the State during February 2012. Above average daytime temperatures were evident in the Kimberley, coastal Eucla and near the southwest Capes, while below average maxima were confined to the central Interior. Minimum temperatures were below to very much average over much of eastern WA, contrasting with above average overnight minima in the SWLD, and in patches of the west Gascoyne, west Pilbara and north Kimberley.
March 2012 saw wet conditions through the Kimberley and adjacent parts of the Pilbara and Interior mainly due to a monsoonal burst during the middle of the month. Above average rainfall was also observed in parts of central and southeastern WA, mostly as a result of ex-tropical cyclone Lua moving through the region. In contrast, below-average rainfall was observed in western and southwestern parts, with a number of sites observing their lowest March rainfall total on record, although March rainfall is typically low. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) experienced its fifth-driest March since comparable records commenced in 1900; whilst WA as a whole saw above-average rainfall.
Much of northern, central and eastern WA saw below to very- much-below-average maximum temperatures in March 2012. Relatively cool days were evident through central WA during the middle part of the month due to the passage of Lua, and Port Hedland Airport observed its coolest March day, and month, on record. In contrast, very hot conditions were evident in western parts of the Gascoyne and Southwest Land Division (SWLD) during the first half of the month, with numerous locations observing multiple days over 40 °C. The Lower Southwest observed its sixth warmest March on record, primarily due to the hot start to the month, though WA as a whole recorded a below-average month for maximum temperatures. The pattern of minimum temperatures was similar to maximum temperatures, with mostly cooler-than-average conditions in northern, central and eastern parts, and warm conditions near the west and south coasts. Averaged across WA as a whole, March 2012 was below average in terms of the overnight temperature, whilst the Lower Southwest was near average.
Severe tropical cyclone Lua formed during mid-March off the Pilbara coast before crossing the coast near Pardoo Station on the 17th and weakening as it tracked through central WA. Lua was the fifth tropical cyclone in the Western Region for the 2011-12 season, and the second to cross the Pilbara coast.
Rainfall during April 2012 was below average in much of the southern half of WA apart from much of the Lower West, which recorded near-average to above-average April rainfall as a result of a rainfall event during the last few days of the month. In the north of the State, rainfall was mostly near-average, although parts of the east Kimberley experienced some heavy rainfall towards the end of the month. When averaged across the State, April 2012 rainfall was below average. Rainfall across the Southwest Land Division (SWLD) as a whole was also below average; however, the Lower Southwest (southwest a line from Jurien Bay to Bremer Bay) recorded near-average rainfall.
Much of southern and western WA, as well as the Interior, saw above-average maximum temperatures in April 2012, with Eyre in the Eucla observing its warmest April on record, largely as a result of a very warm first half of the month. Below-average maximum temperatures were confined to the east Kimberley and coastal parts of the east Pilbara and far west Kimberley. Overnight temperatures were close to average for large parts of WA during April 2012, apart from areas of above-average maxima in much of the SWLD, eastern Eucla, and southeast and central Interior, and areas of below-average minima in the northern Goldfields, east Gascoyne, southeast Pilbara and much of the Kimberley.
Rainfall during May 2012 was below average throughout much of WA, with areas of very-much-below-average rainfall scattered throughout the State. When averaged across the State as a whole, May 2012 rainfall was very much below average and ranked as fifth-lowest on record. The Lower Southwest (southwest a line from Jurien Bay to Bremer Bay) also observed below average rainfall.
Most of WA, apart from the northeast of the State, observed above-average day-time temperatures during May 2012, with consistently warm conditions across the month in the northwest resulting in some stations observing their warmest May on record. Overnight temperatures were below to very much below average in the Kimberley, east Pilbara, and northern and eastern Interior, with near-average conditions in the remainder of WA during May.
Rainfall during June 2012 was near average for much of Western Australia. Above- to very-much-above-average rainfall was observed in isolated parts of western, central, and southern WA, and a number of sites in the South Coastal district observed their wettest June on record, partly due to a significant rainfall event early in the month. In what is typically a dry time of year in the north of WA, areas of above-average rainfall were observed in small parts of the Pilbara, particularly around Karratha, while large areas of below-average rainfall were observed in the Kimberley and central Interior.
Above-average maximum temperatures were observed in much of western, central and southwestern WA during June, with below-average daytime temperatures only observed in the east Kimberley. Averaged across the State as a whole, the mean maximum temperature for WA during June was close to average. Minimum temperatures were below average in northern and eastern parts of WA, while western parts reported above- to very-much-above-average mean minima. Averaged across the State as a whole, the June mean minimum temperature was near average; however the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed above-average overnight temperatures.
A series of low pressure systems and cold fronts crossed southwest WA from 7 to 13 June resulting in significant damage in the region. Two tornadoes were observed with one affecting inner northern Perth suburbs causing extensive localised damage. Significant wind gusts that were some of the highest on record for the region caused an unprecedented number of power outages to mainly western parts of the Southwest Land Division (SWLD), and unusually high sea levels as a result of storm surges caused localised coastal and estuarine inundation. Refer to http://www.bom.gov.au/climate/current/statements/scs40.pdf for further information.
Record-low rainfall was observed across a large part of southwest WA during July 2012 particularly in western districts, centred on the Lower West. A large number of sites observed their driest July on record, many with over 100 years of rainfall records. Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), July 2012 was the driest July on record whilst for the State as a whole it was the third-driest July on record (comparable records commenced in 1900). The very low rainfall during July 2012 was the result of persistent high pressure systems over southern WA during the month and a contraction of the usual fronts and westerly winds southwards.
Most of WA saw below- to very-much-below-average mean minimum temperatures during July 2012, with areas of lowest on record in the central eastern and southeastern Interior, and in central and eastern parts of the Southwest Land Division (SWLD). As a result WA observed its coldest July on record (comparable records commenced in 1950). Above- to very-much-above-average maximum temperatures were observed over much of western WA during July 2012, resulting in the Lower Southwest observing its seventh-warmest July on record.
Rainfall during August 2012 was below to very much below average throughout most of WA, ranking as tenth-lowest on record for the State as a whole. Rainfall was particularly low in southeastern WA where several sites in the Eucla recorded less than 3 mm for the month and Eyre observed its lowest August rainfall in 83 years of record. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed below average rainfall again during August 2012, following its driest July on record, and has observed its fifth-driest January to August period since comparable records commenced in 1900.
Maximum temperatures during August were above to very much above average throughout WA, with areas of highest on record throughout most of the Pilbara and parts of the west Kimberley where a number of sites registered their warmest August on record. When averaged across the State as a whole, the mean maximum temperature during August 2012 ranked as second-highest on record for WA, continuing a run since April of five consecutive above average months for the State. Mean maximum temperatures were also above-average in the Lower Southwest, with above average mean maxima for almost all months, except February, resulting in the third-warmest January to August period for this region since comparable temperature records commenced in 1950.
Overnight temperatures were near average across WA as a whole in August 2012, with below- to very- much-below-average minimum temperatures observed across the Kimberley, adjacent Interior and coastal east Pilbara contrasting with above- to very-much-above-average minimum temperatures in large parts of central, western and southern WA.
When averaged across WA as a whole, rainfall during September 2012 was near-average. Western parts of the Southwest Land Division (SWLD) saw near-average to above-average rainfall during September 2012, with small areas of very-much-above-average rainfall. Walpole in the South Coastal and sites in the western Great Southern observed their wettest September on record. In contrast, below- to very-much-below-average rainfall was observed in much of the central and southern Interior, and Eucla, as rainfall totals were generally low outside the SWLD.
Maximum temperatures during September 2012 were above to very much above average throughout almost all of WA, with the State recording its fourth-highest mean maximum temperature since comparable temperature records commenced in 1950. Areas of highest on record were observed in southeastern and northern parts of the State. Eucla and Eyre, both in the Eucla district, observed their equal warmest and warmest September on record respectively. Minimum temperatures were above average for WA as a whole, with below- to very-much-below-average minimum temperatures in the northern Kimberley contrasting with above- to very-much-above-average overnight temperatures for much of the remainder of the State.
Rainfall in the southern half of WA was mostly below to very much below average during October 2012, with sites in the South and Southeast Coastal, and Great Southern recording their lowest October rainfall. Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), October 2012 rainfall ranked as eighth-lowest since comparable records commenced in 1900; whilst the SWLD ranked as fifth-lowest. The northern half of the State generally saw above- to very-much-above-average rainfall, with Paraburdoo in the Pilbara registering its wettest October in 37 years of records, albeit with a total of 32.8 mm for the month. As a result of the contrasting north and south, October rainfall was near-average for WA as a whole.
Maximum temperatures during October 2012 were above- to very-much-above-average throughout almost all of WA apart from the east Kimberley and northeastern Interior, which saw near-average day-time temperatures. A number of sites in the Southwest Land Division observed their warmest October on record, including Cape Naturaliste with 109 years of record; whilst Emu Creek Station in the west Pilbara also recorded its highest October mean maximum temperature. When averaged across the State, the mean maximum temperature for October 2012 ranked as seventh-highest on record and the Lower Southwest ranked as second-highest on record. Much of the Kimberley and northeastern Interior saw below- to very-much-below-average overnight minima during October 2012; however, most of the remainder of WA recorded above- to very-much-above-average minimum temperatures, with sites in eastern parts of the SWLD and in the Goldfields reporting their highest October mean minimum temperature on record.
Rainfall during November 2012 was above- to very-much-above-average through most of the Southwest Land Division (SWLD), particularly in northern and eastern parts where numerous sites, many with over 100 years of record, observed their wettest November on record. Rainfall was also above- to very-much-above-average in the west and south Gascoyne, the Goldfields, east Pilbara, Southern Interior, western Eucla, and parts of the Kimberley, with some sites in the Kimberley observing record daily and monthly totals due to thunderstorm activity. The only part of WA to experience significant below-average rainfall was in eastern parts of the Northern Interior, and northeastern Southern Interior.
Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), November rainfall was very much above average and in the highest 10 per cent of observations, ranking as eleventh-highest on record. For the SWLD, area averaged rainfall was third-highest on record, while averaged across the State as a whole, November 2012 rainfall ranked as eleventh-highest on record. Comparable area-averaged records commenced in 1900.
Maximum temperatures during November 2012 were above- to very-much-above-average in the west Kimberley, Interior, central Pilbara, northeast Gascoyne, Eucla, and South and Southeast Coastal districts, while northeastern parts of the SWLD and small areas in the west Pilbara saw below-average daytime maxima. The remainder of the State was generally within 1 °C of the average. When averaged across the State as a whole, the mean maximum temperature during November 2012 was in the above-average range, continuing a run of eight consecutive above-average months since April. Mean maximum temperatures were close to, but slightly above, average in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay).
Minimum temperatures were above- to very-much-above-average across an area stretching from the east Pilbara and west Kimberley into the Interior and Eucla. Above-average minima were also experienced in the west Pilbara and southeastern SWLD, while the remainder of the State was generally close to normal. When averaged across the State as a whole, the mean minimum temperature during November 2012 was above average, while the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) saw close to, but slightly above average, overnight temperatures.
Averaged across the state as a whole, rainfall during December 2012 was above-average, while for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) rainfall ranked as the sixth wettest December since comparable records commenced in 1900. For the wider SWLD, December 2012 rainfall was above-average. Significant rainfall was observed in
A surface trough interacting with a middle level low near southwest WA produced
thunderstorms and very heavy rainfall across parts of southwest WA on 12 and
13 December 2012, with a number of sites observing their wettest December
day on record. Daily rainfall in excess of 50 mm was widespread across
the Southwest and Lower West districts, with isolated heavier falls of over
100 mm. Slow-moving heavy thunderstorms over the Bunbury to Collie region produced
extreme rainfall on the 13th, the highest report being 210.8 mm at Yourdamung
Lake (northeast of Collie), which broke the record for the wettest December
day on record in the SWLD, and was the fifth-wettest day on record in the
SWLD for any month. Extreme rainfall was also observed in Collie, with sites
at Collie and Collie East recording 157.2 mm and 135.8 mm respectively.
As a result the town of Collie saw significant flash flooding with businesses
and residences inundated.
When averaged across the state as a whole, the mean maximum temperature for December 2012 was above-average, continuing the run since April of consecutive mean maxima above the average. After a reasonably cool first half of December 2012, very hot conditions in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) towards the end of the month resulted in the region observing its fifth hottest December since comparable records commenced in 1950.
|Rainfall rank||Maximum temperature rank||Minimum temperature rank|
|Summary statistics for 2012|
|North Kimberley (district 01)|
|Kalumburu||33.7||-0.5||39.2||13 Sep||19.5||-0.8||7.6||29 May|
|Wyndham||34.9||-0.7||42.9||7 Dec||21.8||-1.4||10.5||26 Jun||947.1||817.3||high||116%|
|Wyndham Aero||35.5||-0.2||43.8||7 Dec||21.3||-0.9||8.9||12 Aug||714.8||834.9||average||86%|
|East Kimberley (district 02)|
|Argyle Aerodrome||34.6||0.0||44.0||7 Dec||21.1||-1.0||9.1||25 Jun||679.0||764.2||average||89%|
|Halls Creek Airport||33.0||-0.6||43.5||8 Dec||19.1||-0.9||7.1||7 Jul||587.0||566.4||average||104%|
|Kununurra Aero||34.9||+0.1||43.2||6 Dec||19.5||-1.8||6.7||7 Jul||959.4||828.2||high||116%|
|West Kimberley (district 03)|
|Bidyadanga||33.7||+0.4||45.3||9 Dec||10.2||27 May||1021.8||514.3||v high||199%|
|Broome Airport||32.7||+0.5||43.0||9 Dec||20.7||-0.5||7.4||3 Aug||686.4||607.3||average||113%|
|Curtin Aero||35.5||0.0||43.4||8 Dec||19.8||-1.2||6.2||8 Jul||1141.0||863.7||high||132%|
|Derby Aero||34.3||-0.2||43.3||8 Dec||20.1||-1.4||6.1||27 Jun||899.8||690.8||high||130%|
|Fitzroy Crossing Aero||35.7||-0.2||45.0||8 Dec||18.8||-1.3||3.9||4 Jul||772.0||725.1||high||106%|
|West Roebuck||34.3||+0.4||45.0||9 Dec||19.1||-0.8||3.6||25 Jun||783.8||853.1||average||92%|
|De Grey (district 04)|
|Karratha Aero||32.5||+0.2||43.6||15 Nov||20.4||-0.4||7.3||7 Jul||273.8||295.6||average||93%|
|Marble Bar||35.1||-0.3||45.3||24 Dec||19.6||-0.8||5.4||9 Jul||404.8||352.9||average||115%|
|Port Hedland Airport||33.4||+0.2||42.7||10 Dec||19.3||-0.1||5.8||9 Jul||457.2||315.3||high||145%|
|Roebourne||34.7||+0.7||46.4||15 Nov||20.3||-0.2||6.4||8 Jul||344.4||312.3||average||110%|
|Roebourne Aero||34.4||-0.3||46.0||16 Nov||19.1||-0.7||4.5||8 Jul||426.4||272.2||high||157%|
|Fortescue (district 05)|
|Barrow Island Airport||29.5||+0.4||38.8||24 Dec||22.4||+0.2||11.8||15 Jul||235.8||291.2||average||81%|
|Learmonth Airport||32.6||+0.8||46.6||23 Dec||17.9||+0.2||4.0||6 Jul||163.0||251.9||low||65%|
|Mardie||34.1||+0.2||44.8||14 Feb||19.2||+0.5||5.9||9 Jul||133.6||274.6||low||49%|
|Onslow Airport||32.9||+1.0||44.8||13 Feb||20.0||+1.0||7.5||16 Jul||128.0||320.7||low||40%|
|Wittenoom||33.1||+0.2||44.5||24 Dec||19.5||-0.2||4.0||15 Jul||604.0||461.7||high||131%|
|West Gascoyne (district 06)|
|Carnarvon Airport||28.9||+1.7||43.7||28 Jan||17.3||+0.1||3.3||6 Jul||173.0||230.5||average||75%|
|Emu Creek Station||18.6||+0.4||5.6||7 Jul||303.6||299.2||average||101%|
|Shark Bay Airport||29.8||+0.9||44.8||24 Jan||16.7||+0.4||4.7||4 Jul||181.0||209.5||average||86%|
|East Gascoyne (district 07)|
|Newman Aero||31.7||-0.2||44.4||24 Dec||453.2||325.9||high||139%|
|Paraburdoo Aero||33.4||0.0||44.6||23 Dec||17.9||-0.1||1.8||6 Jul||453.0||323.1||high||140%|
|Murchison (district 07A)|
|Meekatharra Airport||29.4||+0.5||42.8||24 Dec||15.8||-0.1||1.8||13 Jul||293.0||239.0||average||123%|
|Mount Magnet Aero||29.0||+0.6||44.1||21 Dec||15.2||+0.2||1.9||22 Jun||220.0||261.3||average||84%|
|North Coast (district 08)|
|Geraldton Airport||27.5||43.9||31 Dec||14.2||1.8||25 Jul||314.4|
|Kalbarri||29.1||+1.5||44.8||27 Jan||15.4||+0.9||1.4||6 Jul||267.2||350.4||low||76%|
|Morawa Airport||28.5||+0.4||43.7||26 Dec||13.1||+0.4||1.3||25 Jul||296.0||289.6||average||102%|
|Mullewa||29.0||+1.1||44.5||26 Dec||14.3||+1.2||2.4||13 Jul||221.8||334.4||low||66%|
|North Island||25.8||+1.2||37.4||6 Mar||18.9||+0.4||7.7||16 Jul||285.8||288.7||average||99%|
|Wongan Hills||26.6||+0.9||42.2||26 Dec||12.4||+0.5||0.0||25 Jul||344.9||388.4||average||89%|
|Central Coast (district 09)|
|Badgingarra Research Stn||26.1||+0.2||41.8||26 Dec||12.6||+0.7||1.8||25 Jul||510.6||551.6||average||93%|
|Bickley||22.7||+0.2||38.6||31 Dec||11.7||+0.6||2.9||9 Jul||1063.6||1079.5||average||99%|
|Champion Lakes||24.8||40.8||31 Dec||14.1||2.7||25 Jul||711.0|
|Garden Island HSF||23.3||+0.7||40.2||25 Jan||15.2||+0.4||5.6||13 Jul||590.6||605.8||average||97%|
|Gingin Aero||26.0||+0.6||41.5||31 Dec||11.6||+0.7||-2.7||25 Jul||636.6||631.7||average||101%|
|Jandakot Aero||25.3||+0.8||41.5||26 Jan||11.8||+0.5||-1.6||25 Jul||684.4||827.4||low||83%|
|Jurien Bay||26.2||+1.4||43.2||24 Jan||13.6||+0.6||0.5||25 Jul||520.8||561.9||average||93%|
|Karnet||22.9||+0.4||39.0||28 Jan||10.9||+0.3||-0.6||28 Sep||1121.9||1170.1||average||96%|
|Pearce RAAF||26.2||+1.1||42.7||31 Dec||12.5||+0.3||-0.8||25 Jul||544.5||655.5||low||83%|
|Perth Airport||25.7||+1.3||42.2||31 Dec||12.6||+0.5||-0.7||25 Jul||647.4||773.2||low||84%|
|Perth Metro*||25.7||+1.1||42.1||31 Dec||13.2||+0.5||0.4||25 Jul||608.2||850.0||low||72%|
|Rottnest Island||23.2||+1.1||39.5||25 Jan||16.3||+0.7||8.9||28 Sep||493.6||682.7||low||72%|
|Swanbourne||25.3||+1.3||43.1||26 Jan||14.3||+0.5||3.9||25 Jul||694.8||724.1||average||96%|
|South Coast (district 09A)|
|Albany||20.8||+1.3||37.3||6 Mar||13.0||+1.3||4.5||10 Aug||913.5||931.3||average||98%|
|Bunbury||23.6||+0.6||40.4||25 Jan||11.4||+0.4||-0.1||25 May||765.6||729.1||average||105%|
|Busselton Aero||23.6||+0.6||41.0||30 Dec||10.4||+0.2||0.4||25 May||569.8||689.8||low||83%|
|Cape Leeuwin||21.1||+1.4||37.9||6 Mar||15.2||+1.1||7.1||9 Jul||770.0||967.4||low||80%|
|Cape Naturaliste||22.6||+2.0||37.7||30 Dec||13.7||+1.0||5.1||24 Jul||619.6||808.9||low||77%|
|Collie East||23.5||39.4||30 Dec||8.5||-3.1||25 May||776.8||730.5||average||106%|
|Donnybrook||24.2||+1.1||40.5||27 Jan||10.9||+1.2||0.0||9 Jul||861.6||975.5||low||88%|
|Dwellingup||23.1||+1.3||39.7||26 Jan||10.1||+0.6||-1.2||25 May||1119.8||1243.1||low||90%|
|Esperance||22.7||+0.9||42.4||23 Feb||12.5||+0.5||4.7||20 Jul||590.0||616.0||average||96%|
|Esperance Aero||22.9||+0.9||41.6||23 Feb||11.4||+0.1||3.2||20 Jul||549.8||565.2||average||97%|
|Hopetoun North||22.4||+0.2||43.5||23 Feb||11.2||-0.3||0.9||11 Oct||458.6||498.7||low||92%|
|Jarrahwood||23.8||+1.3||40.7||26 Jan||8.7||+0.1||-3.0||24 May||809.4||924.7||low||88%|
|Mandurah||23.9||+0.8||41.1||25 Jan||15.2||+0.5||5.8||19 Jul||796.2||673.1||high||118%|
|Manjimup||22.1||+1.8||40.6||30 Dec||10.4||+0.7||1.8||9 Jul||683.2||1002.0||v low||68%|
|North Walpole||21.0||38.1||6 Mar||11.8||3.8||10 Aug|
|Rocky Gully||21.9||+1.1||40.9||30 Dec||9.8||+0.2||0.3||9 Jul||644.6||696.5||average||93%|
|Windy Harbour||20.9||+0.7||39.4||6 Mar||1032.2||1063.9||average||97%|
|Witchcliffe||22.4||+1.1||40.6||30 Dec||10.9||+0.3||0.6||24 May||1087.2||958.5||high||113%|
|North Central (district 10)|
|Bencubbin||26.1||+0.7||42.4||26 Dec||12.4||+0.8||0.1||19 Jul||339.4||316.2||average||107%|
|Cunderdin Airfield||26.7||+0.9||43.1||28 Jan||10.6||+0.2||-2.9||19 Jul||225.2||295.1||low||76%|
|Merredin||26.3||+1.3||42.5||26 Dec||11.9||+0.5||-2.5||25 Jul||315.7||325.9||average||97%|
|South Central (district 10A)|
|Brookton||25.0||+0.8||41.4||31 Dec||10.2||+0.5||-2.1||19 Jul||300.1||450.5||v low||67%|
|Corrigin||25.0||+1.3||41.6||31 Dec||10.2||+0.2||-2.3||19 Jul||237.8||371.9||v low||64%|
|Hyden||26.1||+1.1||42.0||31 Dec||10.3||+0.4||-3.5||19 Jul||280.0||339.5||low||82%|
|Katanning||23.1||+0.7||40.5||30 Dec||9.7||+0.2||-0.1||23 Sep||481.0||456.1||average||105%|
|Lake Grace||24.1||+0.7||40.6||31 Dec||10.7||+0.5||-1.1||18 Jul||283.0||331.2||low||85%|
|Narembeen||26.2||+1.0||42.0||28 Jan||11.2||+0.6||-1.6||25 Jul||322.0||332.3||average||97%|
|Narrogin||23.6||+1.2||40.5||30 Dec||10.1||+0.7||-1.2||9 Jul||350.2||494.9||v low||71%|
|Newdegate Research Station||24.3||+1.0||41.3||28 Jan||8.7||0.0||-2.6||20 Jul|
|Ongerup||23.0||+1.3||40.7||28 Jan||10.1||+0.3||-0.9||25 May||341.9||385.5||low||89%|
|Pingelly||24.5||+1.2||40.6||31 Dec||10.7||+0.3||-1.0||19 Jul||330.6||445.9||low||74%|
|Ravensthorpe||23.7||+1.0||41.2||23 Feb||11.1||+0.7||1.3||23 Sep||333.2||424.2||low||79%|
|Wagin||23.8||+0.9||40.7||30 Dec||9.8||+0.1||-1.0||9 Jul||334.8||434.1||low||77%|
|Wandering||24.0||+0.3||41.1||30 Dec||8.8||+0.4||-3.4||25 May||513.2||507.5||average||101%|
|Eucla (district 11)|
|Balladonia||25.5||+0.9||42.2||31 Dec||10.2||+0.4||-1.4||14 Aug||255.4||262.5||average||97%|
|Eucla||24.2||+1.4||43.3||19 Nov||12.1||-0.1||0.9||15 Jun||230.2||272.1||average||85%|
|Eyre||24.8||+2.0||45.4||22 Dec||9.4||-1.4||-4.0||15 Jun||257.7||309.8||low||83%|
|Forrest||27.3||+1.2||43.6||22 Dec||10.3||-0.6||-1.9||1 Jul||88.4||232.7||v low||38%|
|Red Rocks Point||23.2||43.9||24 Feb||12.9||1.3||15 Jun||202.6|
|South East (district 12)|
|Bulga Downs||28.9||43.0||17 Feb||13.2||-1.3||7 Jul||270.9||234.7||average||115%|
|Kalgoorlie-Boulder Airport||25.8||+0.5||42.6||17 Feb||12.3||+0.6||-1.1||14 Aug||241.0||264.2||average||91%|
|Laverton Aero||27.7||+0.9||43.8||22 Dec||13.9||0.0||-1.0||14 Jul||261.0||292.9||average||89%|
|Leonora||27.9||0.0||43.9||16 Feb||13.7||-0.2||0.1||16 Jul||282.4||236.5||average||119%|
|Munglinup West||23.8||42.6||23 Feb||10.7||2.6||28 Sep|
|Norseman Aero||25.3||+0.2||41.6||31 Dec||9.9||+0.1||-3.6||14 Aug||275.6||291.5||average||95%|
|Salmon Gums Res.Stn.||24.5||+1.1||41.3||31 Dec||9.1||+0.1||-3.3||9 Aug||325.2||353.2||average||92%|
|Southern Cross Airfield||26.2||+0.4||43.8||21 Dec||10.8||+0.6||-2.9||25 Jul||230.8||308.6||low||75%|
|North East (district 13)|
|Giles Meteorological Office||29.8||+0.5||43.8||24 Dec||15.0||-0.9||0.0||23 Jun||228.4||287.2||average||80%|
|Telfer Aero||34.3||+0.2||45.5||24 Dec||19.3||-0.1||4.4||4 Jul||251.0||363.8||average||69%|
|Warburton Airfield||30.2||+0.5||44.6||23 Dec||14.4||-0.3||-4.2||8 Jul||264.6||246.4||average||107%|
|Offshore Islands (district 200)|
|Cocos Island Airport||29.4||+0.4||31.2||6 Mar||25.1||+0.6||20.9||23 Sep||1464.6||1977.9||low||74%|
|Varanus Island||29.3||+0.3||37.7||13 Feb||23.7||+0.3||17.0||6 Jul||254.2||259.4||average||98%|
A Annual Climate Summary is prepared to list the main features of the weather in Western Australia using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.
This statement has been prepared based on information available at 2 pm on Wednesday 2 January 2013. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
Averages are long-term means based on observations from all available
years of record, which vary widely from site to site. They are not shown for
sites with less than 10 years of record.
The median is sometimes more representative than the mean of long-term average rain.
*Official Perth observations have been recorded at several different sites with varying instrumentation over the years, and these changes can affect the continuity of the climate record. For the current Mt Lawley site, the most significant changes of this kind relate to minimum temperature and rain days.
For that reason, current mean temperature and rain-day data quoted here are based only on readings from the Mt Lawley site, which commenced observations in 1993. Sunshine recordings are from Perth Airport and for similar reasons current means use only Perth Airport data, which commenced in 1993.
The Rank indicates how rainfall this time compares with the climate record for the site,
based on the
(very low rainfall is in decile 1, low in decile 2 or 3,
average in decile 4 to 7, high in decile 8 or 9
and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.