Western Australia in November 2012: A wet month in WA

  • Rainfall: very much above average for WA
  • Maximum temperature: above average for WA; near average for southwest WA
  • Minimum temperature: above average for WA; near average in southwest WA

Rainfall

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% of observations, ranking as 11th highest on record. For the SWLD, area averaged rainfall was 3rd highest on record, while averaged across the state as a whole, November 2012 rainfall ranked as 11th highest on record. Comparable area-averaged records commenced in 1900.

The wet November in the Lower Southwest during November raised the year to date rainfall out of the lowest 10% of records, however the January to November total remains below average, currently ranking as 14th lowest on record, largely a result of the 8th driest autumn and 8th driest winter. For the SWLD, January to November rainfall ranked as 12th lowest on record.

A cloudband extending over much of western and southern WA on the last day of October, resulted in rain, showers and thunderstorms, with moderate to heavy falls observed in the 24 hours to 9am on 1 November in eastern parts of the SWLD. The heaviest daily fall was 37.6 mm at Merredin (Central Wheat Belt), which is its wettest November day in 105 years of record. Severe thunderstorms developed during the afternoon of the 1st in the Central West to the east and southeast of Geraldton and moved in a southerly direction before clearing during the evening. A particularly strong cell developed just to the north of Badgingarra and moved southward before dissapating to the southeast of Lancelin. Badgingarra (DAFWA) reported 39.8 mm in the 24 hours to 9am on the 2nd, with 31.6 mm of this total recorded in 12 minutes between 1358 WST and 1410 WST on the 1st; a greater than 1 in 100 year rainfall event. A cold front moved through western and southern WA late on the 3rd and on the 4th, with moderate to heavy falls observed in the Lower West and Southwest districts. The passage of the front across the SWLD was preceeded by a report of a tornado near Wonnerup during the afternoon of the 3rd. Moderate to heavy rainfall was observed in the 24 hours to 9am on the 22nd in northern, central, and eastern parts of the Southwest Land Division, the Goldfields, and Southern Interior. Seven Oaks in the Central Wheat Belt observed its second wettest November day since records commenced in 1922 with 43.0 mm, while Carnegie in the Southern Interior observed its wettest November day on record. Showers and thunderstorms on the 24th brought heavy rainfall to central and eastern parts of the SWLD and the southern Goldfields in the 24 hours to 9am on the 25th, with daily falls generally in the 25 mm to 50 mm range. Gibb Rock (Central Wheat Belt) recorded its highest November daily rainfall in 32 years of record during this event, whilst the daily total at Perth Airport of 26.0 mm in a thunderstorm was the third wettest day in November on record at the site, and 20.8 mm fell in 10 minutes from 1813 WST to 1822 WST, which was a one in 20 to 50 year event.

A strong cold front moved across western and central WA and into the southeast of the state on the 28th, with a secondary front moving over the southwest of the state in the afternoon and evening. A cloudband, with areas of rain and widespread showers and thunderstorms, extended over much of western and southern WA, contracting to the southeast of the state during the evening. The passage of an associated rapidly deepening low just off the the WA southwest coast brought very strong winds to southern WA, with isolated thunderstorms in the Southwest and South Coastal districts. Numerous sites experienced their highest wind gusts for November in more than ten years, with maximum gusts in excess of 90 km/h reported across southern WA. Rottnest Island observed the strongest wind gust of 117 km/h at 1146 WST on the 28th. It was a rare occurrence for such a strong storm in late spring and the storm caused traffic congestion in Perth, with one lane closed on the Kwinana Freeway due to waves on the Swan River over-topping the sea wall, airport delays, and extensive power outages with reports of 50,000 houses losing power. Daily rainfall totals in the 24 hours to 9am on the 29th were generally light to moderate for the southern half of the state, grading to 25 mm to 50 mm in parts of the Lower West and Southwest districts. Culford in the Great Southern recorded its highest November daily rainfall in 44 years of record. Squally conditions continued in southern and western parts of the SWLD on the 29th, with isolated thunderstorms in the Southwest and South Coastal districts, mainly during the morning. Severe gusts were observed near the coast in the Lower West, Southwest, and Southeast Coastal districts, the highest being 117 km/h at Cape Leeuwin at 0445 WST on the 29th. Showers persisted over the southwest of the state on the 30th in a westerly flow.

Shower and thunderstorm activity was a consistent feature during November 2012 in the Kimberley and adjacent Pilbara and Interior, with numerous instances of heavy rainfall and severe wind gusts through the month. Warmun observed 102.0 mm in the 24 hours to 9am on the 29th, which is its wettest November day in 82 years of record.

Maximum temperature

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. Maximum temperatures were up to 2 °C above normal in an area stretching from the east Pilbara and into the Interior, grading to up to 4 °C above normal in the eastern Interior and Eucla, and up to 5 °C above normal in the western Eucla. Northeastern parts of the SWLD and small areas in the west Pilbara saw below average daytime maxima, with small areas up to 1 °C cooler than normal in these regions. 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) continuing the very warm year to date in the region, with almost all months so far in 2012, apart from February, observing above average mean maxima. The mean maximum temperature for January to November 2012 in the Lower Southwest was 1.1 °C above normal and ranked as equal highest with 2011 since comparable temperature records commenced in 1950. The very much above average year so far is largely due to an above average January, a very much above average autumn (5th warmest), and consistently above average maxima from July to October. This run of "warm" temperatures in the Lower Southwest has persisted for three years, with the Lower Southwest only recording two months below the average, in terms of mean maximum temperature, since October 2009.

Cloud, rainfall, and cool southeasterly winds produced some low maximum temperatures in southern parts of WA to begin November 2012, with temperatures in the low to mid-teens. In contrast, temperatures reached the low forties in the Kimberley, Pilbara, and Interior. Temperatures were well above average in the Eucla and adjacent southern Interior on the 4th in northerly winds ahead of a cold front, causing temperatures to rise to the low forties. The front brought a cool day to inland western parts of the state, with the cool conditions persisting on the 5th as a ridge developed in the wake of a cold front. A warm to hot day was observed in western WA on the 9th as a trough deepened near the west coast and the heat moved through southern WA on the 10th, particularly in the southern Goldfields, Southeast Coastal, and Eucla where temperatures were 8 to 10 °C above normal, with the hot conditions persisting in the southeast of the state on the 11th.

Hot conditions were observed in northern WA on the 13th as a trough lay over the area, with eighteen sites observing temperatures over 40 °C. Mandora in the Kimberley was the hottest location with 44.0 °C. A trough inland of the west coast also resulted in hot maximum temperatures in much of the SWLD, particularly in the Central West and northern Central Wheat Belt where temperatures were in the mid-to-high thirties and well above the November average. The hot weather persisted throughout much of WA on the 14th, away from southern and western parts of the SWLD, west Gascoyne, and coastal Kimberley. Numerous sites in central and northern WA observed temperatures of over 40 °C, with Roebourne the hottest location with 45.1 °C. Hot conditions continued across central and northwestern WA on the 15th, particularly in the central Pilbara where temperatures reached the mid-forties. Roebourne observed the highest temperature in the state with 46.4 °C, which was WA's hottest in November 2012, and also the hottest in WA this year so far. Maxima in excess of 40 °C continued across the Pilbara, inland Kimberley, and Northern Interior on the 16th, particularly in the central Pilbara where temperatures reached the mid-forties. Roebourne Aerodrome observed the highest temperature with 46.0 °C. Temperatures across northern WA in general moderated to the low forties on the 17th, while a hot day was observed in the SWLD, particularly in mostly inland western parts. Carnamah and Mullewa in the Central West both reached 40.1 °C.

Hot conditions were observed throughout much of WA on the 18th, away from the west coast, with temperatures well above normal in the eastern SWLD and Goldfields. Hyden in the Great Southern reached 40.0 °C, while Southern Cross Airfield reached 40.2 °C. Temperatures into the low forties were observed in the Eucla and Interior on the 19th, while a trough near the west coast directed generally easterly winds over the area, resulting in a hot day on the 21st in parts of the western SWLD and adjacent southwest Gascoyne. A hot day was observed in south coast districts on the 27th, with temperatures up to 12 °C above average in northerly winds ahead of a trough. The trough moved through southern WA on the 28th, resulting in a hot day was in the southeast of the state on the 28th where temperatures reached the low forties in the Eucla and eastern Interior. Red Rocks Point observed 41.0 °C, its equal hottest November day in 8 years of record.

Maximum temperatures were well below average throughout much of the SWLD on the 29th, following significant cold fronts on the 28th, with a number of sites only reaching the low to mid-teens. The 15.5 C recorded at Collie East was its coolest November day in 9 years of record, while Manjimup recorded the coolest day in WA during November 2012 with a maximum of just 13.1 C.

Minimum temperatures

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, with overnight temperatures up to 3 °C above normal. Above average minima was 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, continuing the run of above average months since September, after eight consecutive below average months to start the year. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) saw close to, but slightly above average, overnight temperatures in November 2012, continuing a run of above average minima in which only two months since November 2010 have recorded below average overnight temperatures (May 2012 and July 2012).

A cool morning was observed in central western parts of WA on the 5th, with temperatures over 10 °C cooler than normal, in contrast to a warm morning through the Kimberley where temperatures were in the high twenties. A cold morning was observed in southern parts of the SWLD and adjacent Goldfields on the 8th, with a number of sites observing temperatures below 5 °C. A broad heat trough across the Kimberley resulted in a warm morning on the 13th, with daily minima in the low thirties in the north Kimberley. Wyndham observed the highest minimum in the state with 31.0 °C. In contrast to the warm conditions in the north of the state, a high pressure ridge in the Bight brought clear skies and light winds to southern WA, with several sites in the Southwest and Eucla recording daily minima below 5 °C.

After a hot day on the 14th, cloudy conditions as a result of thunderstorms persisted overnight with minimum temperatures in the high twenties to low thirties in the Pilbara and Interior on the 15th. Wittenoom was the warmest location with 31.4 °C, which was also the state's warmest night in November 2012. A warm morning was again observed on the 16th in the Kimberley, Pilbara and Interior, with temperatures in the high twenties to low thirties at a number of sites. A warm night was experienced in large parts of the SWLD and Goldfields on the 22nd, with minimum temperatures in the high teens to low twenties. A warm morning was observed in the Kimberley on the 23rd after a hot day on the 22nd, with temperatures in the high twenties and Wyndham Aerodrome recording a minimum temperature of 30.1 °C.

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Extremes in November 2012
Hottest day 46.4 °C at Roebourne on the 15th
Warmest days on average 41.2 °C at Marble Bar
Coolest days on average 20.3 °C at Windy Harbour
Coldest day 13.1 °C at Manjimup on the 29th
Coldest night 0.0 °C at Eyre on the 9th
Coolest nights on average 8.9 °C at Jarrahwood
Warmest nights on average 28.0 °C at Troughton Island
27.0 °C at Wyndham
Warmest night 31.4 °C at Wittenoom on the 15th
Wettest overall 290.9 mm at Theda
Wettest day 102.0 mm at Warmun on the 29th
Highest wind gust 117 km/h at Rottnest Island on the 28th
117 km/h at Cape Leeuwin on the 29th

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 November daily rainfall
Highest daily rainfall
in November 2012 (mm)
Previous wettest
for November
Years of
record
Merredin 37.6 on the 1st 36.6 on the 16th in 1951 105
Warmun 102.0 on the 29th 90.2 on the 27th in 1920 82
Carnegie 38.4 on the 22nd 33.0 on the 16th in 2008 58
Culford 35.6 on the 29th 26.4 on the 14th in 1974 44
Gibb Rock 41.2 on the 25th 27.6 on the 17th in 1983 32



Record highest total November rainfall
Total rainfall
for November 2012 (mm)
Previous wettest
for November
Years of
record
Average for
November
Bulong 97.0 73.9 in 1958 115 16.1
Burracoppin 104.8 90.9 in 1929 112 14.2
Nungarin 94.8 77.6 in 1983 109 13.3
Cowcowing 83.2 64.0 in 1983 105 11.4
Kokardine 55.0 53.4 in 1983 105 11.4
Moningarin 90.0 68.3 in 1983 103 12.5
Ballidu 59.6 47.0 in 1983 102 11.0
Trayning 105.8 90.6 in 1983 102 14.5
Belka 84.0 75.0 in 1983 101 11.7
Bencubbin 106.2 67.8 in 1983 101 13.6
Koorda 120.8 71.6 in 1981 100 11.6
Westonia 97.0 91.4 in 1929 98 15.9
Narembeen 83.6 75.7 in 1956 86 16.6
Holt Rock 81.7 73.4 in 1974 84 19.3
Hyden 99.1 72.5 in 1929 84 18.9
Cadoux 59.2 57.4 in 1983 80 13.2
Graham Rock 93.4 92.3 in 1939 79 18.9
Seven Oaks 135.8 68.4 in 1983 78 15.0
Latham 48.8 46.7 in 1946 77 10.3
King Rocks 87.8 54.4 in 1939 74 19.1
Karlgarin 74.4 66.6 in 1971 72 19.1
Gabbin 98.6 91.0 in 1981 71 15.5
Perth Airport 85.0 80.7 in 1946 69 26.9
Goodlands 78.0 51.8 in 1956 62 12.2
Mount Walker 85.2 80.6 in 1993 57 17.8
Swanara 74.2 54.2 in 2011 52 18.2
Theda 290.9 283.4 in 1990 47 108.4
Cowarna Downs 84.4 77.2 in 1973 45 21.7
Culford 80.2 64.8 in 1984 44 23.1
Bickley 128.6 120.0 in 1984 43 43.9
Jurien Bay 72.0 63.6 in 1991 43 19.1
Mount Elizabeth 175.9 164.8 in 1973 39 74.4
Swan View 82.6 69.4 in 1992 38 30.7
Pickering Brook 103.1 92.4 in 1984 35 43.1
Desert Fringe 65.2 52.0 in 2011 32 25.7
Gibb Rock 103.6 46.6 in 1983 32 20.1



Summary statistics for November 2012
Maximum temperatures
for November
(°C)
Minimum temperatures
for November
(°C)
Rainfall
for November
(millimetres)
Mean for
November
2012
Diff
from
average
Highest for
November
2012
Mean for
November
2012
Diff
from
average
Lowest for
November
2012
Total for
November
2012
Average
for
November
Rank of
November
2012
Fraction of
November
average
North Kimberley (district 01)
Doongan 35.9 -0.8 38.0 9th 22.5 -0.4 20.1 8th 136.0 115.1 average 118%
Kalumburu 36.2 -0.9 38.5 8th 24.5 -0.2 22.0 15th 100.8 80.4 high 125%
Mount Elizabeth 36.0 -0.2 38.5 9th 21.9 +0.3 14.8 9th 175.9 74.4 highest 236%
Troughton Island 33.4 +0.5 34.5 28th 28.0 +0.6 24.2 10th 13.0 9.6 high 135%
Truscott 35.2   36.5 29th 25.8   22.6 15th 16.4
Wyndham 38.6 -0.8 41.1 12th 27.0 -0.1 22.1 18th 109.6 54.7 high 200%
Wyndham Aero 38.9 -1.0 42.1 2nd 26.9 +0.3 22.5 18th        
East Kimberley (district 02)
Argyle Aerodrome 39.5 +0.9 42.3 17th 26.9 +0.8 23.0 18th 20.6 58.7 low 35%
Halls Creek Airport 38.6 +0.3 42.1 23rd 24.8 +0.4 21.0 8th 48.6 37.4 high 130%
Kununurra Aero                 34.4 61.3 low 56%
Warmun 39.8 +0.5 43.1 8th 25.3 +0.4 22.0 20th 189.0 60.3 v high 313%
West Kimberley (district 03)
Bidyadanga 35.6 +0.7 43.2 13th 25.3 +1.4 21.5 8th 0 7.8 lowest 0%
Broome Airport 34.7 +1.1 39.9 2nd 26.6 +1.5 23.4 9th 3.2 8.9 average 36%
Curtin Aero 40.5 +0.7 42.7 3rd 24.4 +0.3 19.2 8th 7.8 23.3 average 33%
Cygnet Bay                 0 4.9 lowest 0%
Derby Aero 38.5 +0.5 42.6 9th 26.1 +0.7 20.6 9th 2.4 12.8 average 19%
Fitzroy Crossing Aero 40.6 -0.1 43.6 24th 25.4 0.0 19.2 9th 30.4 30.1 average 101%
West Roebuck 36.9 +0.6 42.4 2nd 24.4 +0.8 18.3 9th 6.8 10.1 average 67%
De Grey (district 04)
Bedout Island 33.0   35.0 10th        
Karratha Aero 35.1 +0.2 43.6 15th 22.9 -0.1 19.3 6th 0 1.5 lowest 0%
Mandora 36.7 +0.1 44.0 13th 23.0 +1.3 17.0 8th 1.6 6.6 high 24%
Marble Bar 41.2 +0.9 44.6 14th 24.4 +0.6 19.7 17th 14.2 8.5 high 167%
Pardoo Station 37.4 +0.9 44.5 14th 22.2 +0.1 17.0 7th 0 3.3 lowest 0%
Port Hedland Airport 36.8 +0.6 42.4 14th 22.3 +1.0 17.9 7th 2.2 2.7 high 81%
Roebourne 39.0 +1.0 46.4 15th 23.1 +0.5 18.0 6th 0 1.5 lowest 0%
Roebourne Aero 39.1 +0.5 46.0 16th 22.4 +0.1 15.2 6th 0 3.7 v low 0%
Fortescue (district 05)
Barrow Island Airport 30.3 -0.1 35.1 12th 23.2 +0.4 20.8 5th 0 2.0 v low 0%
Learmonth Airport 34.6 +0.1 41.1 14th 18.8 +0.4 14.7 29th 0.4 1.9 high 21%
Mardie 35.4 -1.0 42.9 15th 20.8 +0.8 17.6 7th 0 1.5 lowest 0%
Onslow Airport 34.4 +0.1 42.5 14th 20.7 +0.7 17.9 5th 0 3.0 lowest 0%
Wittenoom 39.2 +1.2 43.7 16th 24.1 +0.5 19.2 5th 0 9.4 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 27.7 +0.1 38.0 9th 18.9 +0.3 13.3 3rd 5.4 4.2 high 129%
Denham 26.6 -1.1 36.7 9th 18.1 -0.5 12.5 29th 7.4 3.1 high 239%
Emu Creek Station 36.5 -0.3 41.9 12th 19.2 -0.1 14.5 5th 1.2 3.8 high 32%
Shark Bay Airport 29.3 -1.1 38.3 9th 17.1 -0.4 10.3 3rd 6.4 1.7 high 376%
East Gascoyne (district 07)
Newman Aero 37.9 +0.7 42.3 16th 22.1 +1.4 15.4 10th 16.8 12.3 high 137%
Paraburdoo Aero 38.5 +0.3 43.4 17th 21.7 +0.4 15.7 6th 1.6 8.1 average 20%
Murchison (district 07A)
Meekatharra Airport 33.9 +0.7 41.0 14th 19.1 +0.4 12.0 5th 0 11.6 lowest 0%
Mount Magnet Aero 32.4 +0.1 40.2 14th 17.6 -0.1 10.2 6th 19.0 10.9 high 174%
North Coast (district 08)
Carnamah 29.7 -0.4 40.1 17th 13.8 +0.5 9.5 12th 56.4 10.7 v high 527%
Dalwallinu 28.2 -2.2 37.6 17th 12.8 0.0 6.3 3rd 47.2 8.9 v high 530%
Geraldton Airport 27.3   36.9 21st 14.5   8.0 12th 25.6
Geraldton Airport Comparison 27.3 +0.1 37.1 21st 14.4 +0.6 7.8 12th 0 9.2 lowest 0%
Kalbarri 28.1 -0.1 36.0 21st 15.6 +0.7 10.7 3rd 15.8 7.1 high 223%
Morawa Airport 30.7 -1.2 39.8 17th 13.9 -0.4 9.4 7th 31.4 9.7 high 324%
Mullewa 30.7 -0.3 41.0 21st 14.2 -0.1 9.7 11th 30.6 8.8 v high 348%
North Island 25.2 0.0 28.4 9th 18.1 -0.4 11.5 3rd 13.4 7.7 high 174%
Wongan Hills         13.0 0.0 9.0 7th 56.6 12.4 v high 456%
Central Coast (district 09)
Badgingarra Research Stn 27.1 -1.2 36.9 17th 12.4 +0.2 7.4 3rd        
Bickley 23.5 -1.3 33.4 17th 11.7 -0.1 7.8 11th 128.6 43.9 highest 293%
Champion Lakes 25.0   34.7 17th 14.3   11.0 5th 79.0
Garden Island HSF 22.8 -1.0 30.6 21st 15.3 -0.3 12.0 12th 37.8 25.1 high 151%
Gingin Aero 26.7 -1.2 36.4 17th 11.2 -0.7 7.7 7th        
Gosnells City 26.4 -1.0 36.0 17th 13.7 -0.6 10.5 11th 51.4 29.2 high 176%
Jandakot Aero 25.5 -0.6 35.7 21st 11.8 -0.7 7.2 10th 67.8 29.9 v high 227%
Jurien Bay 25.7 -0.1 35.2 21st 13.7 +0.2 9.0 12th 72.0 19.1 highest 377%
Karnet 23.0 -1.4 33.0 22nd 11.2 -0.2 6.8 29th 121.9 48.1 v high 253%
Lancelin         14.1 0.0 9.5 12th 43.3 21.3 high 203%
Medina Research Centre 26.1 +0.2 36.2 21st 12.7 -0.7 8.6 9th        
Pearce RAAF 27.5 +0.4 36.9 17th 12.0 -0.5 8.0 10th 59.0 23.8 high 248%
Perth Airport 26.1 +0.3 36.1 17th 12.7 0.0 7.7 13th 85.0 26.9 highest 316%
Perth Metro* 25.9 -0.3 35.3 17th 14.0 -0.2 10.6 5th 58.2 22.1 v high 263%
Rottnest Island 22.7 -0.3 26.7 21st 15.7 -0.1 10.0 5th 36.4 17.2 high 212%
Swanbourne 25.0 -0.3 35.8 21st 14.1 -0.5 10.3 12th 60.0 25.7 v high 233%
South Coast (district 09A)
Albany 21.2 +0.8 31.6 27th 13.1 +0.7 8.7 30th 95.7 45.2 v high 212%
Albany Airport 22.3   34.6 27th 10.3   6.1 12th 63.2
Albany Airport Comparison 22.0 +1.2 35.0 27th 10.5 -0.3 6.9 26th 57.0 47.6 high 120%
Bunbury 23.1 -1.2 32.3 21st 11.6 -0.5 5.3 12th 50.0 26.6 high 188%
Busselton Aero 24.0 -0.9 32.3 21st 9.9 -0.8 3.5 12th 48.2 25.3 high 191%
Cape Leeuwin 20.7 +0.6 23.4 17th 14.8 +0.6 8.7 29th 51.4 37.3 high 138%
Cape Naturaliste 21.9 +0.5 27.3 21st 12.9 +0.4 8.9 29th 35.8 26.3 high 136%
Collie East 24.3   33.3 21st 9.6   2.9 12th 74.0 35.2 v high 210%
Donnybrook 24.7 -0.1 33.5 21st 11.4 +1.0 5.8 11th 65.9 33.7 high 196%
Dwellingup 23.4 -0.2 32.9 21st 10.9 +0.5 6.3 12th 120.6 47.5 v high 254%
Esperance 23.5 +0.4 37.2 18th 13.2 +0.5 8.7 12th 56.2 34.6 high 162%
Esperance Aero 25.1 +1.1 36.7 18th 12.1 +0.2 6.2 12th 73.8 37.2 v high 198%
Harvey 24.3 -0.8 33.0 22nd 10.8 -1.1 5.5 11th 65.8 40.3 v high 163%
Hopetoun North 22.8 -0.6 37.7 18th 10.5 -1.8 5.8 9th 56.6 39.4 high 144%
Jarrahwood 23.8 +0.2 31.5 21st 8.9 -0.6 2.0 12th 96.8 44.2 v high 219%
Mandurah 23.4 -1.2 33.1 21st 15.3 -0.3 11.3 5th 57.2 27.8 v high 206%
Manjimup 22.4 +0.5 30.8 17th 10.1 0.0 5.7 12th 88.6 46.9 v high 189%
North Walpole 20.6   25.5 27th 11.3   7.6 8th 88.4
Pemberton 21.8 +0.5 29.4 17th 10.6 +0.3 6.1 8th 98.6 61.8 high 160%
Rocky Gully 23.9 +0.8 33.2 27th 9.3 -0.5 3.6 12th 62.8 41.2 high 152%
Windy Harbour 20.3 -0.5 23.1 27th 11.8 0.0 7.4 29th 59.5 43.5 high 137%
Witchcliffe 22.5 -0.2 28.9 21st 10.0 -0.9 5.1 8th 61.8 37.9 high 163%
North Central (district 10)
Bencubbin 27.8 -1.2 38.6 18th 13.9 +0.8 9.1 3rd 106.2 13.6 highest 781%
Cunderdin Airfield 28.8 -1.1 38.5 18th 12.3 +0.2 6.7 3rd 40.2 16.2 high 248%
Kellerberrin 28.5 -0.4 38.0 18th         69.3 12.4 v high 559%
Merredin 27.8 -0.7 39.3 18th 13.5 +0.4 7.8 6th 68.6 14.5 v high 473%
Northam 28.2 -0.3 36.9 17th 12.3 -0.1 5.9 3rd 49.2 12.5 v high 394%
York 28.2 -0.9 37.4 17th 10.4 -0.7 5.5 3rd 38.6 17.2 high 224%
South Central (district 10A)
Beverley 28.2 -0.2 37.2 17th 11.7 +0.2 7.2 12th 51.0 15.3 v high 333%
Brookton 27.3 -0.1 35.9 17th 11.5 +0.5 6.6 3rd 30.5 14.9 high 205%
Corrigin 27.3 +0.3 38.7 18th 11.8 +0.5 7.4 5th 41.9 16.6 v high 252%
Hyden 28.0 -0.4 40.0 18th 12.3 +0.9 6.0 6th 99.1 18.9 highest 524%
Jacup 26.3 +1.8 37.8 27th 10.1 +0.3 3.8 12th        
Katanning 26.3 +0.3 35.5 27th 9.7 -0.3 3.2 12th 28.4 26.9 average 106%
Lake Grace 26.4 -0.6 37.3 18th 12.4 +0.7 7.9 5th 47.4 25.5 high 186%
Narembeen 28.0 -0.5 39.4 18th 12.9 +0.7 8.0 5th 83.6 16.6 highest 504%
Narrogin 25.7 +0.2 34.0 17th 11.1 +1.0 5.9 8th 37.8 18.4 v high 205%
Newdegate Research Station 26.6 -0.5 38.2 18th 10.7 +0.7 4.3 12th 54.6 22.0 v high 248%
Ongerup 25.5 +1.2 36.2 27th 10.6 +0.1 4.8 12th 24.0 25.7 average 93%
Pingelly 26.6 +0.4 34.6 18th 11.7 +0.4 7.0 8th 38.2 15.5 v high 246%
Ravensthorpe 25.2 +0.2 38.2 18th 11.8 +0.8 7.1 12th 61.6 30.3 high 203%
Wagin 26.1 +0.5 34.7 17th 11.1 +0.5 5.0 12th 29.8 18.2 high 164%
Wandering 25.9 -1.4 34.7 17th 9.5 +0.1 4.0 12th 60.8 20.4 v high 298%
Eucla (district 11)
Balladonia 28.4 +0.5 36.9 10th 12.3 +1.0 7.0 12th 75.4 22.4 v high 337%
Eucla 28.5 +4.3 43.3 19th 13.7 +0.4 6.5 8th 16.0 18.2 average 88%
Eyre         12.2 +0.2 0.0 9th 38.1 20.4 high 187%
Forrest 32.4 +2.6 43.5 19th 13.0 0.0 6.2 9th 17.2 21.8 average 79%
Red Rocks Point 26.2   41.0 28th 14.4   7.8 6th 28.2
South East (district 12)
Bulga Downs 32.4   42.4 18th 16.7   10.5 3rd 32.1 10.9 v high 294%
Kalgoorlie-Boulder Airport 29.0 0.0 39.8 14th 14.6 +0.5 9.0 7th 62.8 18.1 v high 347%
Laverton Aero 32.4 +1.6 41.3 14th 17.1 +0.2 9.1 6th 33.6 20.9 high 161%
Leinster Aero 32.6 +0.3 42.0 18th 17.4 -0.7 11.0 6th 23.0 18.4 average 125%
Leonora 32.4 +0.2 42.0 14th 17.3 +0.3 12.0 6th 43.4 12.5 v high 347%
Leonora Aero 32.1   42.0 14th 17.4   10.5 5th 50.6
Munglinup West 25.6 -0.4 38.8 18th 11.5 +0.2 6.9 12th
Norseman Aero 27.8 -1.0 37.5 18th 12.0 -0.1 4.6 8th 92.2 25.2 v high 366%
Salmon Gums Res.Stn. 26.7 +0.4 36.8 18th 11.1 +1.0 2.9 12th 64.2 26.2 v high 245%
Southern Cross Airfield 28.9 -1.0 40.2 18th 13.5 +0.6 7.5 6th        
Yeelirrie         16.4 +0.2 9.6 6th        
North East (district 13)
Balgo Hills 39.8 +1.2 43.1 24th 25.3 +1.1 21.5 4th 8.0 23.4 average 34%
Carnegie 36.5 +1.2 43.2 14th 20.4 +1.3 13.9 8th 61.2 13.0 v high 471%
Giles Meteorological Office 36.7 +2.5 41.4 28th 21.7 +1.8 14.9 6th 1.8 27.5 low 7%
Telfer Aero 40.3 +1.0 44.6 14th 25.0 +1.7 18.3 7th 24.2 16.5 high 147%
Warburton Airfield 35.9 +1.7 42.4 19th 20.2 +1.7 12.6 7th 62.8 24.7 v high 254%
Wiluna 34.4 +0.5 42.0 18th 18.2 +0.4 11.5 6th 30.8 11.2 high 275%
Offshore Islands (district 200)
Christmas Island Aero 28.6 +1.4 29.2 20th 24.1 +1.3 23.0 27th 90.4 146.7 average 62%
Cocos Island Airport 29.5 +0.5 30.6 27th 25.2 +0.8 23.5 27th 18.0 101.5 low 18%
Varanus Island 30.3 +0.3 33.8 10th 23.4 0.0 20.9 5th 0 0.8 v low 0%

Notes

A Monthly 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 December 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.

*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.

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

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.

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