Western Australia in winter 2012: A very dry winter

  • Rainfall: 7th driest winter for WA; 6th driest for southwest WA
  • Maximum temperature: above average for WA
  • Minimum temperature: 7th coolest winter for WA; near average for southwest WA

Rainfall

Rainfall during winter 2012 was below to very much below average throughout much of WA, and a few sites in the Great Southern observed their lowest winter rainfall in over 100 years of record, with the previous record being winter 2010. This low rainfall was in stark contrast to the above average rainfall reported in the nearby South and Southeast Coastal districts, mainly due to heavy rainfall in early June, and the fact that two sites in the South Coastal district reported their highest winter rainfall on record. Averaged across WA as a whole, winter rainfall was the 7th driest on record, whilst the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) ranked as the 6th driest for winter 2012 (comparable records commenced in 1900) mainly due to the region registering its driest July on record. For the Southwest Land Division (SWLD) as a whole, rainfall in winter 2012 ranked as the 9th driest on record.

Significant rainfall events during winter 2012:

  • June 2012 saw frequent rainfall in western and southern parts of the SWLD, with some sites recording rainfall on over 20 days in the month. A series of low pressure systems and cold fronts brought a number of significant weather events to the SWLD, which not only brought moderate to heavy rainfall, but also damaging winds and significant storm surges during the first half of the month, particularly between the 7th and 13th. Please refer to the Special Climate Statement 40 for detailed information on these events. The second half of June saw mainly light to moderate rainfall events in the SWLD, with the passage of several more moderate cold fronts.
  • A slow moving trough and low pressure system moved over the SWLD at the end of May and the start of June bringing moderate to heavy rainfall and thunderstorms to southern and eastern parts of the SWLD and adjacent Goldfields. A number of locations in the Southwest and South Coastal districts registered daily rainfall totals over 80 mm during the first two days of June, and broke their winter daily rainfall record. Peppermint Grove in the South Coastal observed 174.2 mm on the 1st, which is a June record in its 106 years of record and the second highest daily total for any month for the site behind the 196.9 mm on 6 May 1921. It was also the 2nd highest daily rainfall total for June for the SWLD. Warner Glen in the Southwest district recorded a total of 106.4 mm on the 1st, which was its wettest day in its 63 years of record. Tamaru in the South Coastal received a daily total of 116.2 mm on the 2nd, which was the highest daily total for any month in its 47 years of record. Several sites in the South Coastal district recorded their highest June monthly total rainfall due to a combination of this event and above average rainfall for the remainder of the month.
  • A low off the WA west coast on 6 June brought extensive cloud to much of the state resulting in areas of rain over much of western WA. Heavy falls were observed in the Pilbara and Central West, with totals over 50 mm reported near Roebourne, whilst highest June daily falls in 10 years were reported at some Pilbara sites as a result of the unseasonal rainfall.
  • A rapidly deepening tropical low off the northwest coast moved near the west coast during the morning and crossed the Southwest district during the afternoon on 10 June. The system brought very windy conditions to the Lower West, Southwest, South Coastal, and Great Southern districts. The highest recorded wind gust during the event was 146 km/h at Cape Naturaliste, which is the strongest wind gust observed at the site in almost 10 years of record, and the 4th strongest wind gust on record in Western Australia in the May to August period. Widespread property damage was reported in western parts of the SWLD with a significant number of trees downed, and 800 power lines southwest of a line from Geraldton to Ravensthorpe damaged. More than 170,000 homes lost power and it took several days for power to be restored to all residents in the region. A significant storm surge with minor coastal inundation was reported along the SWLD west coast. Some moderate to heavy falls were observed in the west Pilbara, west Gascoyne, and western parts of the SWLD during the event and a few locations in the northern Central West recorded their wettest winter day on record as a result.
  • Most of WA, apart from the Kimberley, experienced a wet day on 11 June as a cold front moved through the SWLD and a cloudband moved across northwest and central parts of the state. Moderate to heavy falls were mainly confined to southern parts of the SWLD, whilst west coast parts of the division endured more severe winds and a storm surge event.
  • A rapidly developing cold front and deep low pressure system moved through the SWLD during the afternoon and evening of 12 June, and through central and eastern parts of southern WA on the 13th. Widespread rainfall was recorded through the SWLD, with heavy falls in the 40 mm to 60 mm range in the Southwest and Lower West districts. Thunderstorms, moderate to heavy rainfall, and severe wind gusts were reported in the SWLD, particularly in the Southwest and neighbouring districts, as further roof damage was reported to buildings, trees were uprooted, and additional power lines were downed. Another storm surge occurred although it was weaker than previous recent events.
  • Individual rainfall events over southern WA during July were mainly confined to cold fronts moving through the region on the 6th to 8th, 10th to 12th, 16th and 17th, and 23rd and 24th, though falls were generally modest. Otherwise, strong ridging over southern WA resulted in generally clear conditions across much of the state for much of the month, and thus WA recorded its 3rd driest July, and a significant number of stations in the SWLD recorded their driest July in more than 100 years of rainfall recording.
  • A strong cold front moved over the southwest corner of WA early on 31 July, bringing widespread rainfall to the SWLD and some heavy falls to the Central West with several stations observing their wettest August daily rainfall total in the 24 hours to 9am on the 1st. Following this front a generally westerly flow and a series of cold fronts over southern WA during the first week of August 2012 brought consistent rainfall to the region, although daily totals after the 1st were generally only light to moderate and August totals very below average across most of WA.

Maximum temperature

Mean daily maximum temperatures during winter 2012 were above to very much above average throughout most of WA, apart from in the southeast Kimberley which saw below average daytime maxima.. Areas of highest on record were evident in the west Pilbara and far norhtwest Gascoyne where temperatures were up to 3 °C above normal. Learmonth recorded its warmest winter in 37 years of record with a mena maximum of 26.6 °C, whilst Emu Creek Station recorded its equal warmest winter.

When averaged across the state, the mean maximum temperature for winter 2012 was above average, whilst the Lower Southwest also recorded an above average winter.

A high moving south of WA in mid-August resulted warm to hot conditions through northwest and central parts of WA from the 16th through to the 21st, with unseasonally hot days observed in the west Pilbara and Gascoyne on the 18th. Onslow Airport observed its warmest winter temperature in 48 years of record on the 18th, with a maximum of 35.2 °C. Hot conditions re-established over northern WA late in the month and Telfer Aerodrome recorded a maximum temperatue of 36.0 °C on the 28th, its equal highest winter temperature in 39 years of record.

Minimum temperature

Minimum temperatures were below to very much below average during winter 2012 in most of eastern and northern WA, with temperatures up to 4 °C below normal in the northeast Kimberley. Western and central WA saw mostly near average overnight temperatures, with areas of above average mean minima in the west Pilbara, west Gascoyne, and northern SWLD, and areas below average in the central and eastern SWLD, and in the Goldfields.

When averaged across the state, the mean minimum temperature for WA for winter 2012 was very much below average, and ranked as the 7th lowest since comparable records commenced in 1950, whilst the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) was near average.

Cloudy skies and northerly winds in the western parts of the state in the second week of June brought unseasonally warm nights on the 10th and 11th. Emu Creek Station in the west Pilbara recorded a minimum of 22.2 °C on the 10th, its warmest winter night in 41 years of recording, and Kalbarri recorded a minimum of 19.4 °C on the 11th, its warmest winter night in 39 years of recording.

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Extremes in winter 2012
Hottest day 38.5 °C at Fitzroy Crossing Aero on 27 Aug
Warmest days on average 31.7 °C at Kalumburu
Coolest days on average 15.7 °C at Rocky Gully
Coldest day 10.1 °C at Norseman Aero on 10 Jul
Coldest night -4.2 °C at Yeelirrie on 7 Jul
-4.2 °C at Warburton Airfield on 8 Jul
Coolest nights on average 3.5 °C at York
Warmest nights on average 21.3 °C at Troughton Island
14.8 °C at Wyndham
Warmest night 24.7 °C at Troughton Island on 3 Jun
23.3 °C at Argyle Aero on 26 Aug
Wettest overall 578.2 mm at Walpole
Wettest day 174.2 mm at Peppermint Grove on 2 Jun
Highest wind gust 146 km/h at Cape Naturaliste on 10 Jun

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Record highest winter daily rainfall
Highest daily rainfall
in winter 2012 (mm)
Previous wettest
for winter
Years of
record
Peppermint Grove 174.2 on 2 Jun 105.2 on 7 Jul 1945 106
Eradu 62.6 on 10 Jun 58.9 on 28 Jun 1910 72
Coolangatta 54.4 on 10 Jun 44.0 on 30 Jul 1996 63
Warner Glen 106.4 on 1 Jun 91.2 on 20 Jun 1967 63
Wayjo Park 60.0 on 2 Jun 54.0 on 2 Jul 1978 50
Albany Airport Comparison 96.4 on 2 Jun 65.4 on 20 Jul 1991 49
Tamaru 116.2 on 2 Jun 112.7 on 2 Aug 1992 47
Kimberley 88.2 on 1 Jun 70.0 on 25 Jun 1988 44
Walpole Forestry 84.6 on 1 Jun 73.0 on 22 Jun 1983 42
Vermeulen 68.6 on 1 Jun 59.0 on 16 Jul 1984 39
Warra Jarra 84.0 on 1 Jun 67.2 on 26 Aug 1993 34
Karingal 33.6 on 2 Jun 33.2 on 15 Aug 1976 33



Record highest total winter rainfall
Total rainfall
for winter 2012 (mm)
Previous wettest
for winter
Years of
record
Average for
winter
Tamaru 429.8 416.7 in 1992 45 269.3
Warra Jarra 331.2 249.0 in 1986 33 181.1



Record lowest total winter rainfall
Total rainfall
for winter 2012 (mm)
Previous driest
for winter
Years of
record
Average for
winter
Wagin 104.7 109.0 in 1914 122 200.7
Narrogin 114.8 118.4 in 2010 121 241.7
Wickepin 88.7 96.0 in 2010 101 194.5



Record highest winter temperature
Highest temperature
in winter 2012 (°C)
Previous warmest
for winter
Years of
record
Average for
winter
Onslow Airport 35.2 on 18 Aug 34.8 on 31 Aug 2006 48 26.1
Telfer Aero 36.0 on 28 Aug = 36.0 on 23 Aug 1995 39 26.3



Record highest winter mean daily maximum temperature
Mean daily maximum
temperature
for winter 2012 (°C)
Previous warmest
for winter
Years of
record
Average for
winter
Emu Creek Station 28.1 = 28.1 in 1977 39 26.3
Learmonth Airport 26.6 26.2 in 2003 37 25.1



Record highest winter daily minimum temperature
Highest daily minimum
temperature
in winter 2012 (°C)
Previous warmest
for winter
Years of
record
Average for
winter
Emu Creek Station 22.2 on 10 Jun 21.9 on 14 Aug 2011 41 12.0
Kalbarri 19.4 on 11 Jun 19.3 on 19 Jul 1985 39 10.2



Record lowest winter mean daily minimum temperature
Mean daily minimum
temperature
for winter 2012 (°C)
Previous coolest
for winter
Years of
record
Average for
winter
Eyre 3.7 = 3.7 in 2010 49 6.2
Wyndham 14.8 = 14.8 in 2002 44 17.8



Summary statistics for winter 2012
Maximum temperatures
for winter
(°C)
Minimum temperatures
for winter
(°C)
Rainfall
for winter
(millimetres)
Mean for
winter
2012
Diff
from
average
Highest for
winter
2012
Mean for
winter
2012
Diff
from
average
Lowest for
winter
2012
Total for
winter
2012
Average
for
winter
Rank of
winter
2012
Fraction of
winter
average
North Kimberley (district 01)
Kalumburu 31.7 -0.5 37.5 26 Aug 13.0 -1.1 8.1 27 Jun 0.2 4.1 low 5%
Mount Elizabeth 29.0 0.0 34.7 30 Aug         0 17.9 lowest 0%
Troughton Island 27.7 -0.9 29.7 15 Jul 21.3 -1.4 18.9 3 Aug 4.6 11.2 high 41%
Wyndham 31.1 -0.8 37.2 26 Aug 14.8 -3.0 10.5 26 Jun 0 7.0 lowest 0%
Wyndham Aero 31.7 -0.4 38.3 26 Aug 14.0 -1.6 8.9 12 Aug 0 7.0 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 29.7 -0.6 36.5 26 Aug 14.1 -2.2 9.1 25 Jun 0 6.2 v low 0%
Halls Creek Airport 27.4 -0.7 35.1 30 Aug 12.1 -1.6 7.1 7 Jul 0 13.4 lowest 0%
Kununurra Aero 30.9 -0.2 38.0 26 Aug 12.3 -3.4 6.7 7 Jul 0 5.5 lowest 0%
Warmun 29.6 -0.8 36.4 26 Aug 11.9 -1.8 6.0 1 Aug 0 12.5 lowest 0%
West Kimberley (district 03)
Bidyadanga 30.8 +0.7 37.1 26 Aug     10.2 4 Jul 1.8 30.3 low 6%
Broome Airport 29.8 +0.4 36.6 27 Aug 13.1 -1.5 7.4 3 Aug 1.6 26.4 low 6%
Curtin Aero 31.5 -0.1 38.4 26 Aug 13.4 -2.6 6.2 8 Jul 0 18.1 v low 0%
Derby Aero 30.7 -0.5 37.2 31 Aug 12.3 -3.3 6.1 27 Jun 0 16.8 lowest 0%
Fitzroy Crossing Aero 31.0 -0.4 38.5 27 Aug 10.6 -2.2 3.9 4 Jul 0 16.4 v low 0%
West Roebuck 31.2 -0.1 37.9 26 Aug 11.4 -1.4 3.6 25 Jun 0.4 32.0 v low 1%
De Grey (district 04)
Karratha Aero 27.2 +0.2 34.6 20 Aug 13.4 -0.9 7.3 7 Jul 58.2 47.7 high 122%
Mandora 30.3 +0.8 37.5 28 Aug     2.8 9 Jul 1.8 28.1 low 6%
Marble Bar 28.7 +0.7 36.5 28 Aug 11.9 -0.9 5.4 9 Jul 5.0 33.0 average 15%
Pardoo Station 29.0 +0.2 36.0 29 Aug 12.3 -1.5 4.5 14 Jul 17.7 38.3 average 46%
Port Hedland Airport 28.7 +0.8 35.5 28 Aug 12.1 -1.1 5.8 9 Jul 11.4 36.8 average 31%
Roebourne 29.0 +1.4 36.4 21 Aug 13.5 -1.0 6.4 8 Jul 71.6 47.8 high 150%
Roebourne Aero 28.6 -0.1 35.9 21 Aug 11.5 -1.3 4.5 8 Jul 84.2 34.8 high 242%
Fortescue (district 05)
Barrow Island Airport 24.6 +0.3 30.1 20 Aug 17.5 -0.5 11.8 15 Jul 36.0 43.1 average 84%
Learmonth Airport 26.6 +1.5 33.5 30 Aug 11.8 -0.5 4.0 6 Jul 16.0 76.0 v low 21%
Mardie 29.3 +0.9 35.3 20 Aug 12.5 -0.2 5.9 9 Jul 28.0 57.8 average 48%
Onslow Airport 27.7 +1.6 35.2 18 Aug 14.1 +0.6 7.5 16 Jul 45.2 74.6 average 61%
Wittenoom 26.7 +1.5 34.4 27 Aug 12.2 -0.3 4.0 15 Jul 13.0 50.4 low 26%
West Gascoyne (district 06)
Carnarvon Airport 24.6 +1.7 29.1 18 Jun 10.8 -0.8 3.3 6 Jul 50.0 110.9 low 45%
Denham 22.8 +0.5 29.1 3 Jun 15.0 +1.8 10.0 6 Jul 116.7 116.6 average 100%
Emu Creek Station 28.1 +1.8 34.9 11 Aug 12.1 +0.1 5.6 7 Jul 25.7 70.0 low 37%
Murchison 23.3 +1.6 32.5 26 Aug 7.0 +0.2 0.0 3 Jul 71.3 78.9 average 90%
Shark Bay Airport 24.0 +0.5 29.8 3 Jun 11.2 +0.1 4.7 4 Jul 126.0 92.9 high 136%
East Gascoyne (district 07)
Newman Aero 24.8 +0.8 33.6 28 Aug 7.0 +0.1 -0.7 5 Jul 5.2 35.0 low 15%
Paraburdoo Aero 26.8 +1.0 34.7 27 Aug 10.5 0.0 1.8 6 Jul 11.4 48.0 low 24%
Murchison (district 07A)
Meekatharra Airport 21.8 +1.8 30.5 26 Aug 8.4 +0.2 1.8 13 Jul 22.4 63.4 low 35%
Mount Magnet Aero 20.9 +1.1 31.0 26 Aug 7.9 +0.3 1.9 22 Jun 63.4 70.2 average 90%
North Coast (district 08)
Carnamah 19.8 +1.1 26.7 11 Aug 7.9 +0.2 1.7 25 Jul 133.5 194.8 low 69%
Geraldton Airport 21.1   28.4 4 Jun 9.3   1.8 25 Jul 213.6
Geraldton Airport Comparison 20.9 +0.7 28.7 4 Jun 9.5 -0.3 1.6 25 Jul 214.0 256.4 average 83%
Kalbarri 23.7 +1.4 29.6 4 Jun 10.0 -0.2 1.4 6 Jul 152.7 201.8 low 76%
Morawa Airport 20.2 +0.7 28.0 11 Aug 7.2 +0.6 1.3 25 Jul 150.0 118.4 average 127%
Mullewa 21.2 +1.6 30.3 11 Aug 8.6 +1.1 2.4 13 Jul 118.0 167.2 low 71%
North Island 22.0 +0.5 27.1 3 Jun 15.4 -0.4 7.7 16 Jul 215.4 179.3 average 120%
Wongan Hills 18.8 +1.1 25.9 11 Aug 7.0 0.0 0.0 25 Jul 150.8 192.5 low 78%
Central Coast (district 09)
Badgingarra Research Stn 18.7 +0.5 25.8 3 Jun 8.1 +0.5 1.8 25 Jul 237.2 296.2 average 80%
Bickley 16.2 +0.6 21.6 11 Aug 7.8 +0.3 2.9 9 Jul 433.4 592.7 low 73%
Champion Lakes 18.8   23.7 3 Jun 9.5   2.7 25 Jul 285.8
Garden Island HSF 18.4 +0.1 23.1 3 Jun 11.3 -0.1 5.6 13 Jul 267.4 324.4 low 82%
Gingin Aero 19.4 +0.5 24.4 11 Aug 6.5 -0.1 -2.7 25 Jul 273.4 350.6 low 78%
Gosnells City 19.9 +0.8 25.5 3 Jun         263.4 457.8 v low 58%
Jandakot Aero 19.3 +0.9 24.3 10 Aug 6.7 -0.4 -1.6 25 Jul 303.6 461.3 v low 66%
Jurien Bay 21.0 +1.1 26.2 21 Jul 8.8 -0.9 0.5 25 Jul 261.0 308.8 low 85%
Karnet 16.7 +0.8 22.1 10 Aug 6.2 -0.4 -0.5 19 Jul 441.3 621.2 v low 71%
Lancelin 20.6 +1.1 26.2 5 Jun         213.7 336.7 v low 63%
Medina Research Centre 19.6 +0.8 24.5 10 Aug 8.1 -0.4 0.3 25 Jul 286.8 410.5 v low 70%
Pearce RAAF 19.3 +1.0 24.3 11 Aug 7.8 -0.9 -0.8 25 Jul 256.8 374.6 low 69%
Perth Airport 19.5 +1.1 24.5 11 Aug 8.0 -0.3 -0.7 25 Jul 276.4 436.5 v low 63%
Perth Metro* 19.7 +0.9 24.5 11 Aug 8.0 -0.2 0.4 25 Jul 262.6 478.7 v low 55%
Rottnest Island 18.6 +0.5 23.4 3 Jun 13.0 +0.3 9.1 18 Jul 271.6 392.1 v low 69%
Swanbourne 19.7 +0.9 24.7 3 Jun 9.8 -0.2 3.9 25 Jul 310.8 389.9 low 80%
South Coast (district 09A)
Albany 17.4 +1.2 22.1 21 Jul 9.6 +1.1 4.5 10 Aug 400.0 403.5 average 99%
Albany Airport 17.0   22.0 11 Aug 7.5   0.9 10 Aug 420.4
Albany Airport Comparison 16.8 +0.6 21.9 11 Aug 7.6 -0.1 0.9 10 Aug 371.2 334.5 high 111%
Bridgetown 16.7 +0.5 22.5 3 Jun 4.6 -0.2 -2.1 10 Aug 322.8 346.1 low 93%
Bunbury 18.0 +0.3 23.8 3 Jun 7.3 -0.2 0.1 18 Jul 320.8 408.1 low 79%
Busselton Aero 17.6 +0.4 23.6 3 Jun 6.7 -0.4 1.0 10 Aug 303.2 370.3 low 82%
Cape Leeuwin 17.8 +1.1 22.0 4 Jun 12.5 +0.9 7.1 9 Jul 352.2 494.3 low 71%
Cape Naturaliste 17.8 +1.1 21.4 5 Jun 11.4 +0.7 5.1 24 Jul 309.8 438.5 v low 71%
Collie East 17.3   22.5 3 Jun 3.9   -2.4 5 Jul 264.0 364.2 low 72%
Donnybrook 18.1 +1.0 22.7 4 Jun 6.3 +0.2 0.0 9 Jul 372.5 525.7 low 71%
Dwellingup 16.8 +1.3 22.1 10 Aug 5.4 -0.4 -1.1 19 Jul 458.2 674.1 v low 68%
Esperance 18.3 +0.6 27.2 26 Aug 8.7 0.0 4.7 20 Jul 265.8 259.6 average 102%
Esperance Aero 17.2 +0.3 25.5 12 Aug 7.7 -0.2 3.2 20 Jul 226.0 214.9 average 105%
Harvey 18.1 +0.4 23.0 5 Jun 7.5 -0.2 0.5 24 Jul 363.4 434.6 low 84%
Hopetoun North 18.8 +0.1 29.7 11 Aug 8.2 +0.1 3.0 5 Jul 218.6 172.0 high 127%
Mandurah 18.4 +0.5 22.9 5 Jun 11.1 +0.1 5.8 19 Jul 349.2 343.8 low 102%
Manjimup 16.1 +1.2 21.0 11 Aug 7.1 +0.3 1.8 9 Jul 294.4 485.1 v low 61%
North Walpole 16.7   20.9 9 Jun 9.1   3.8 10 Aug
Pemberton 16.5 +1.1 21.1 3 Jun 8.0 +0.5 2.3 10 Aug 428.2 569.1 low 75%
Rocky Gully 15.7 +0.5 20.4 11 Aug 6.9 0.0 0.3 9 Jul 302.4 277.1 average 109%
Windy Harbour 17.5 +0.4 22.3 9 Jun 9.7 +0.7 2.5 9 Jul 457.7 532.7 low 86%
Witchcliffe 17.1 +0.3 21.3 11 Aug 8.1 -0.2 1.3 9 Jul 518.8 500.6 high 104%
North Central (district 10)
Bencubbin 18.3 +1.2 28.4 11 Aug 6.8 +0.4 0.1 19 Jul 86.9 132.1 low 66%
Cunderdin Airfield 18.7 +1.0 25.9 31 Aug 4.7 -0.2 -2.9 19 Jul 90.4 128.2 low 71%
Kellerberrin 18.3 +1.2 27.0 11 Aug         87.3 147.1 v low 59%
Merredin 18.5 +1.6 28.4 11 Aug 6.0 +0.1 -2.5 25 Jul 93.8 139.3 low 67%
Northam 18.7 +1.1 24.6 11 Aug 4.9 -0.9 -2.9 25 Jul 143.3 223.8 low 64%
York 18.3 +0.6 24.0 11 Aug 3.5 -0.6 -3.1 25 Jul 152.3 191.1 low 80%
South Central (district 10A)
Beverley 18.4 +0.9 24.2 31 Aug 4.7 -0.7 -2.6 19 Jul 121.8 215.2 v low 57%
Brookton 17.5 +0.9 23.8 4 Jun 4.4 -0.5 -2.1 19 Jul 123.0 234.2 v low 53%
Corrigin 17.3 +1.3 25.8 31 Aug 4.1 -1.1 -2.3 19 Jul 103.7 167.8 v low 62%
Hyden 18.5 +1.4 28.7 11 Aug 4.3 -0.7 -3.5 19 Jul 84.2 137.9 low 61%
Jacup 17.1 +0.8 26.0 31 Aug 5.7 -0.2 1.1 18 Jul 159.8 138.6 high 115%
Katanning 15.8 +0.5 22.3 11 Aug 6.0 -0.2 1.1 18 Jul 154.2 189.8 v low 81%
Lake Grace 17.0 +0.6 26.0 31 Aug 5.5 -0.2 -1.1 18 Jul 80.8 104.7 low 77%
Narembeen 18.5 +1.3 27.7 11 Aug 5.5 -0.2 -1.6 25 Jul 90.5 143.5 v low 63%
Narrogin 16.5 +1.4 22.6 31 Aug 5.0 -0.6 -1.2 9 Jul 114.8 241.7 lowest 47%
Newdegate Research Station 17.0 +1.0 26.2 31 Aug 4.0 -0.4 -2.6 20 Jul
Ongerup 16.5 +1.0 25.1 11 Aug 5.7 -0.4 -0.5 18 Jul 127.0 141.8 average 90%
Pingelly 17.1 +1.2 23.0 11 Aug 5.4 -0.5 -1.0 19 Jul 115.8 225.9 v low 51%
Ravensthorpe 17.8 +0.9 28.3 11 Aug 7.1 0.0 2.3 18 Jul 142.5 134.5 average 106%
Wagin 16.8 +0.9 23.2 11 Aug 5.1 -0.7 -1.0 9 Jul 104.7 200.7 lowest 52%
Wandering 16.7 +0.4 22.9 11 Aug 4.0 -0.3 -2.5 9 Jul 201.8 261.9 low 77%
Eucla (district 11)
Balladonia 19.2 +1.0 28.2 12 Aug 4.9 -0.4 -1.4 14 Aug 57.7 67.7 average 85%
Eucla 19.2 +0.6 29.7 27 Aug 6.9 -0.7 0.9 15 Jun 58.2 81.5 low 71%
Eyre 19.9 +1.1 28.6 12 Aug 3.7 -2.5 -4.0 15 Jun 77.5 104.3 low 74%
Forrest 20.1 +0.7 31.5 27 Aug 4.0 -1.7 -1.9 1 Jul 12.6 48.8 v low 26%
Red Rocks Point 19.3   28.5 31 Aug 7.5   1.3 15 Jun 63.2
South East (district 12)
Bulga Downs 21.2   31.6 12 Aug 5.4   -1.3 7 Jul 58.4 67.0 average 87%
Kalgoorlie-Boulder Airport 18.5 +0.9 27.4 12 Aug 5.8 +0.2 -1.1 14 Aug 54.2 74.4 average 73%
Laverton Aero 20.0 +1.0 30.5 27 Aug 6.4 -0.3 -1.0 14 Jul 26.4 42.9 average 62%
Leinster Aero 20.5 +0.8 30.0 27 Aug 6.6 -0.4 0.5 23 Jun 21.8 45.2 low 48%
Leonora 20.0 +0.6 29.6 12 Aug 6.3 -0.5 0.1 16 Jul 41.7 60.1 average 69%
Leonora Aero 20.3   30.3 12 Aug 6.1   -0.8 16 Jul 32.6
Munglinup West 17.6 +0.2 27.4 11 Aug 6.8 -0.2 2.8 8 Aug 166.6 115.8 v high 144%
Norseman Aero 18.4 +0.2 27.5 26 Aug 3.9 -0.4 -3.6 14 Aug 53.0 56.3 average 94%
Salmon Gums Res.Stn. 18.0 +1.3 27.8 12 Aug 4.4 -0.6 -3.3 9 Aug 83.0 108.6 low 76%
Southern Cross Airfield 18.3 +0.7 28.9 11 Aug 4.0 +0.3 -2.9 25 Jul 83.8 91.4 average 92%
North East (district 13)
Giles Meteorological Office 21.5 +0.5 32.5 28 Aug 6.1 -1.8 0.0 23 Jun 1.6 39.3 low 4%
Telfer Aero 27.3 +1.0 36.0 28 Aug 10.7 -1.0 4.4 4 Jul 3.6 30.6 low 12%
Warburton Airfield 22.2 +0.7 33.8 28 Aug 4.7 -1.7 -4.2 8 Jul 3.0 41.0 low 7%
Wiluna 22.1 +1.8 31.5 27 Aug         12.5 49.0 low 26%
Offshore Islands (district 200)
Varanus Island 24.7 -0.1 28.0 5 Aug 19.9 -0.3 17.0 6 Jul 35.2 30.8 average 114%

Notes

A Seasonal 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 10 am on Monday 3 September 2012. 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.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (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.

Records in this summary are based on sites with at least 30 years of data.

For PDF files of Perth Metro climate statistics for other months, please click here for extremes and here for averages.

Further information

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