Western Australia in December 2011: Third wettest December for southwest WA

  • Rainfall: Near average for WA; 3rd wettest December for southwest WA.
  • Maximum temperature: Near average.
  • Minimum temperature: Near average for WA; 4th warmest for southwest WA.

Rainfall

Rainfall in WA during December 2011 was above to very much above average for most of the Southwest Land Division (SWLD), adjacent parts of the Goldfields, and the southeast Gascoyne, with numerous sites in the SWLD (many with over 100 years of record) registering their wettest December on record, mainly due to extremely heavy rainfall events on the 6th and 12th. Above to very much above average rainfall was also observed in the Interior and inland Kimberley, where the highest rainfall totals for December in WA were recorded, and the coastal Eucla, while below to very much below average rainfall was evident through much of the Pilbara and northwest Gascoyne, the coastal Kimberley, and inland Eucla (see the December 2011 rainfall totals & deciles maps).

When averaged across the state, December 2011 rainfall was near average, however for both the SWLD and the Lower Southwest (southwest a line from Jurien Bay to Bremer Bay), December 2011 ranked as 3rd wettest on record. Comparative rainfall records commenced in 1900.

A deep middle level trough off the west coast produced the first significant summer rainfall in the SWLD and the adjacent Goldfields and Gascoyne on the 6th. Numerous sites in the Lower West, Central Wheat Belt, and Great Southern observed over 50 mm during the event, though the heaviest downpours occurred in the eastern Central Wheatbelt and northeast Great Southern. Daily rainfall totals of 109.0 mm at Amrista Park and 105.0 mm at Hyden, both in the northeast Great Southern, in the 24 hours to 9am on the 7th were not only their wettest December days on record, but also their highest daily rainfall total for any month, and in the top ten highest December daily falls on record in the SWLD. Many other sites in the SWLD also broke their previous wettest December day on record on the 7th.

Another deep mid-level trough off the west coast brought further widespread moderate to heavy rainfall across the SWLD and the adjacent Goldfields and Gascoyne on the evening on the 12th and into the morning of the 13th, with numerous sites in the SWLD and Gascoyne observing their highest December daily rainfall on record. Areas in the Great Southern were hit hardest by the downpour, and the daily total of 125.6 mm at Williams in the Great Southern in the 24 hours to 9am on the 13th was not only their wettest December day in 115 years of record, but also the highest daily rainfall recorded in December in the SWLD. For more details of these two extreme heavy rainfall events, please see Special Climate Statement 35.

Maximum temperature

Mean daily maximum temperatures in WA during December 2011 were below to very much below average over eastern parts of the SWLD, the Goldfields, western Eucla, and southern Interior, with areas up to 3 °C cooler than normal in the southern Interior, eastern Goldfields, and far western Eucla. Below average daytime temperatures were also observed in coastal parts of the Pilbara, despite extremely hot days in the week prior to Christmas with temperatures in the high 40s. Above to very much above average maxima were observed along the west coast of WA, extending into the northern Gascoyne and inland Pilbara. Western and northern parts of the Kimberley also saw above average mean maxima, with temperatures up to 3 °C above normal (see the December 2011 mean maximum temperature deciles & anomaly maps) recorded around King Sound in the Kimberley, and Shark Bay in the Gascoyne.

When averaged across WA as a whole, daytime temperatures were near average for December 2011.

Extremely hot weather was observed in the Pilbara from the 20th through to the 25th, with numerous sites observing daily maxima over 47 °C, and several sites registering record high December temperatures. The December maximum temperature record for WA was also broken on three consecutive days, with Roebourne (49.4 °C on the 21st), Roebourne Airport (49.0 °C on the 21st), Onslow (49.2 °C on the 22nd), and Learmonth Airport (48.9 °C on the 23rd), all surpassing the previous December record of 48.8 °C set at Mardie on 26 December 1986. To further illustrate the significance of the event, Roebourne's 49.4 °C was the 2nd hottest December day on record in Australia, just 0.1 °C below the 49.5 °C recorded at Birdsville in Queensland on 24 December 1972, and the 5th hottest day on record in WA. Sites in WA have recorded temperatures of over 48 °C during December on 18 occasions, and 10 of those occurred during this event.

Minimum temperature

Mean daily minimum temperatures in WA in December 2011 were above to very much above average over large parts of western and southern WA, as well as in the west Kimberley, with up to 3 °C warmer than normal mean minima in the southwest Gascoyne, Central West, and Lower West. Several sites in western parts of the SWLD registered record high December mean minima, including Donnybrook in the Southwest, which has 105 years of record. Broome Airport also recorded its warmest December nights in 72 years of record. Below to very much below average overnight temperatures were reported in the central and southeast Kimberley, and northern and central Interior, with a small patch of up to 3 °C cooler than normal minima in the central Interior (see the December 2011 minimum temperature deciles & anomaly maps).

When averaged across the state, overnight temperatures in WA in December 2011 were below average, however, the Lower Southwest observed its 4th warmest December on record. Comparable temperature records commenced in 1950.

Hot nights were observed in the inland Pilbara from the 20th through to the 26th, with several sites observing minimum temperatures over 30 °C after extremely hot days. Wittenoom observed the hottest night for December 2011 with 33.2 °C on the 22nd, closely followed by Paraburdoo with 33.0 °C on the 26th.

Other Phenomena

Heavy rainfall and thunderstorms on the 6th caused flash flooding, flooded roads, fallen trees and minor damage to homes in Perth and Northam.

Thunderstorms and flash flooding occurred across parts of the SWLD, including the Perth Metropolitan area on the 12th. In the Great Southern region, there was significant flooding in Williams and Narrogin with homes and roads flooded. There were also reports of minor damage to roofs, fallen trees on homes, cars and fences.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in December 2011
Hottest day 49.4 °C at Roebourne on the 21st
49.2 °C at Onslow Airport on the 22nd
49.0 °C at Roebourne Aero on the 21st
48.9 °C at Learmonth Airport the 23rd
Warmest days on average 42.5 °C at Marble Bar
Coolest days on average 22.2 °C at Albany
Coldest day 16.5 °C at Mount Barker on the 13th
Coldest night 4.1 °C at Salmon Gums Res.Stn. on the 26th
Coolest nights on average 12.5 °C at Jacup
Warmest nights on average 27.9 °C at Troughton Island
27.7 °C at Broome Airport
Warmest night 33.2 °C at Wittenoom on the 22nd
Wettest overall 289.8 mm at Doongan
Wettest day 138.8 mm at Mount Krauss on the 29th
Highest wind gust 100 km/h at Halls Creek Airport on the 21st

Record highest December daily rainfall
Highest daily rainfall
in December 2011 (mm)
Previous wettest
for December
Years of
record
Pingelly 72.2 on the 7th 61.0 on the 30th in 1999 111
Gingin 76.0 on the 7th 66.0 on the 16th in 1923 107
Katanning Comparison 63.0 on the 13th 54.9 on the 3rd in 1940 106
Codg Codgen 76.6 on the 7th 53.0 on the 25th in 1991 105
Wagin 87.0 on the 13th 66.0 on the 24th in 1987 105
Williams 125.6 on the 13th 74.2 on the 22nd in 1958 105
Narrogin 84.4 on the 13th 57.8 on the 31st in 1980 104
Darkan 64.8 on the 13th 53.3 on the 29th in 1912 102
Bannister 105.4 on the 13th 57.6 on the 31st in 1980 101
Dumbleyung 71.0 on the 13th 51.0 on the 31st in 1983 101
Trayning 70.4 on the 7th 35.8 on the 3rd in 1940 101
Belka 72.0 on the 7th 51.1 on the 20th in 1913 100
Rushy Pool 70.0 on the 13th 61.5 on the 1st in 1951 100
Arthur River 71.0 on the 13th 53.4 on the 23rd in 1987 99
Kukerin 61.0 on the 13th 50.2 on the 31st in 1980 98
Bruce Rock 62.0 on the 7th 44.5 on the 18th in 1952 95
Dellyanine 70.0 on the 13th 64.0 on the 24th in 1987 92
Koorda 40.0 on the 7th 36.8 on the 19th in 1978 90
Nairibin 67.0 on the 13th 49.0 on the 31st in 1980 89
Narembeen 87.4 on the 7th 39.6 on the 24th in 1987 85
Hyden 105.0 on the 7th 47.2 on the 3rd in 1940 83
Hines Hill 65.6 on the 7th 63.2 on the 24th in 1995 81
Holt Rock 42.4 on the 7th 28.2 on the 17th in 1960 80
Woodanilling 58.6 on the 13th 51.8 on the 3rd in 1940 76
Karlgarin 94.0 on the 7th 48.0 on the 24th in 1987 75
Beacon 41.0 on the 7th 29.2 on the 12th in 1930 73
Lake King 44.0 on the 7th 43.2 on the 3rd in 1940 73
Seven Oaks 50.0 on the 7th 38.4 on the 19th in 1978 73
Perth Airport 35.2 on the 13th 27.2 on the 3rd in 1951 68
Pearce RAAF 48.8 on the 7th 34.5 on the 18th in 1952 57
Amrista Park 109.0 on the 7th 58.0 on the 25th in 1987 56
Mount Walker 59.0 on the 7th 32.8 on the 17th in 1960 54
Swanara 90.0 on the 7th 43.4 on the 24th in 1987 51
Kojonolokan Hills 60.0 on the 13th 35.0 on the 1st in 2001 49
Spring Valley 70.0 on the 7th 64.4 on the 24th in 1995 49
Allan Rocks 65.6 on the 7th 34.8 on the 7th in 1987 44
Roleystone 40.0 on the 7th 28.4 on the 27th in 1966 44
Mordetta 74.0 on the 7th 42.0 on the 25th in 1987 37
Gibb Rock 49.0 on the 7th 28.4 on the 23rd in 1987 31



Record highest total December rainfall
Total rainfall
for December 2011 (mm)
Previous wettest
for December
Years of
record
Average for
December
Bannister 140.0 88.4 in 1888 127 13.7
Williams 141.4 75.0 in 1958 126 13.8
Gingin 78.9 72.6 in 1923 122 10.9
Pingelly 101.8 88.2 in 1951 121 12.6
Wagin 105.6 76.6 in 1951 121 12.7
Narrogin 143.1 94.6 in 1913 120 14.1
Katanning Comparison 85.4 74.4 in 1951 119 16.6
Marradong 115.2 95.8 in 1913 115 13.1
Darkan 81.6 54.3 in 1912 111 10.8
Codg Codgen 95.2 75.6 in 1991 110 11.8
Nungarin 82.6 70.6 in 1913 108 12.3
Trayning 77.6 76.4 in 1978 101 11.6
Lake Grace Comparison 93.4 70.2 in 1913 100 15.0
Bruce Rock 124.0 60.7 in 1923 95 13.1
Dellyanine 91.4 72.4 in 1987 93 13.5
Borden 102.2 66.6 in 2001 88 17.5
Nairibin 75.0 72.2 in 1983 88 11.3
Narembeen 104.0 69.1 in 1951 85 13.0
Boscabel 72.8 50.4 in 1967 84 14.4
Hyden 138.0 97.8 in 1987 83 15.1
Hines Hill 98.4 86.4 in 1995 80 9.2
Mount Madden 97.0 91.7 in 1987 80 16.6
Karlgarin 147.4 76.9 in 1987 74 14.1
Waroona 73.0 49.8 in 1980 74 14.1
Beacon 82.0 48.6 in 1958 73 12.5
Lake King 120.4 67.3 in 1940 73 15.5
Perth Airport 65.8 65.5 in 1951 68 11.2
Newdegate Research Station 136.0 66.9 in 1980 58 15.3
Amrista Park 135.8 132.6 in 1987 56 16.0
Twolganup 65.0 64.0 in 1958 56 16.3
Mount Walker 87.4 72.0 in 1987 55 13.7
Dandaragan West 64.2 50.4 in 2007 54 9.7
Swanara 101.8 58.2 in 1962 51 12.2
Kojonolokan Hills 78.6 57.7 in 1983 49 14.9
Pearce RAAF 65.0 53.6 in 1952 49 10.2
Erinair 89.2 73.2 in 1983 44 18.6
Roleystone 67.2 44.4 in 1967 44 15.2
Esperance 62.0 55.4 in 1980 43 18.9
Bickley 41.0 40.6 in 1983 41 13.2
Esperance Aero 66.0 59.0 in 1983 41 20.4
Mordetta 74.0 72.0 in 1987 37 16.3
Pickering Brook 55.1 34.9 in 1984 34 14.4
Desert Fringe 87.0 70.0 in 2008 31 17.7



Record highest December temperature
Highest temperature
in December 2011 (°C)
Previous warmest
for December
Years of
record
Average for
December
Roebourne 49.4 on the 21st 47.6 on the 31st in 1969 55 39.0
Onslow 48.7 on the 22nd 47.3 on the 23rd in 1980 51 35.2
Onslow Airport 49.2 on the 22nd 47.3 on the 12th in 1950 46 35.9
Learmonth Airport 48.9 on the 23rd 46.8 on the 21st in 2004 37 36.8
Marble Bar 48.4 on the 21st 48.3 on the 29th in 1956 117 41.6



Record highest December mean daily minimum temperature
Mean daily minimum
temperature
for December 2011 (°C)
Previous warmest
for December
Years of
record
Average for
December
Donnybrook 15.8 15.5 in 1977 105 12.3
Albany 15.9 15.8 in 1963 93 14.0
Broome Airport 27.7 27.5 in 2002 72 26.5
Pearce RAAF 17.3 17.1 in 2002 52 14.4
Brookton 15.9 15.7 in 1999 44 13.4
Kalbarri 19.8 19.4 in 2009 38 17.3


Summary statistics for December 2011
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2011
Diff
from
average
Highest for
December
2011
Mean for
December
2011
Diff
from
average
Lowest for
December
2011
Total for
December
2011
Average
for
December
Rank of
December
2011
Fraction of
December
average
North Kimberley (district 01)
Doongan 34.9 +0.4 38.6 1st 22.8 -0.3 20.7 15th 289.8 222.5 average 130%
Kalumburu 35.5 +0.2 38.5 26th 24.9 -0.1 22.8 5th 212.6 237.0 average 90%
Mount Elizabeth 35.4 +1.4 39.0 1st 22.5 +0.2 20.4 4th 121.4 166.1 average 73%
Troughton Island 33.6 +0.7 35.3 21st 27.9 +0.7 23.3 28th 72.0 120.1 average 60%
Truscott 35.1   37.7 21st 26.6   21.7 13th 79.2
Wyndham 38.4 +0.3 41.5 25th 27.2 +0.2 22.5 5th 148.0 150.2 average 99%
Wyndham Aero 39.0 +1.2 42.9 1st 26.9 +0.2 22.1 5th 86.6 129.2 average 67%
East Kimberley (district 02)
Argyle Aerodrome 37.6 +0.5 40.6 26th 26.1 +0.2 21.3 3rd 106.8 137.0 average 78%
Halls Creek Airport 37.1 -0.7 40.9 26th 24.2 -0.5 20.3 4th 150.4 82.1 v high 183%
Kununurra Aero 38.1 +1.0 42.4 26th 25.4 0.0 22.2 3rd 69.8 135.4 low 52%
Warmun 37.9 -0.6 41.0 26th 24.9 -0.3 21.6 3rd 141.3 114.6 average 123%
West Kimberley (district 03)
Bidyadanga 34.9 0.0 40.6 2nd 26.7 +1.0 24.3 3rd 0 54.4 lowest 0%
Broome Airport 34.5 +0.7 40.5 2nd 27.7 +1.2 23.9 29th 0.2 56.0 v low 0%
Curtin Aero 40.1 +1.8 45.1 1st 24.8 -0.2 21.3 9th 66.6 146.4 low 45%
Derby Aero 39.1 +2.1 44.9 1st 26.4 +0.1 23.2 13th 9.6 69.9 low 14%
Fitzroy Crossing Aero 39.6 +0.5 44.2 1st 24.8 -0.9 21.8 3rd 85.4 121.1 low 71%
West Roebuck 36.6 +0.8 41.6 22nd 25.6 +0.4 23.0 22nd 8.2 103.7 v low 8%
De Grey (district 04)
Bedout Island 32.4   34.0 25th 26.6   25.0 5th
Karratha Aero 35.1 -0.7 46.3 21st 25.3 -0.2 21.5 7th 0 12.7 lowest 0%
Legendre Island 31.7   36.9 21st 25.4   23.7 7th
Mandora 35.0 -1.8 42.5 2nd     22.4 6th 4.0 33.8 average 12%
Marble Bar 42.5 +0.9 48.4 21st 26.4 +0.4 22.3 8th 12.4 28.7 average 43%
Pardoo Station 37.0 +0.7 43.0 19th 24.2 -0.5 20.8 6th 0 23.6 lowest 0%
Port Hedland Airport 35.6 -1.0 43.0 20th 24.7 +0.7 21.6 5th 0 18.1 lowest 0%
Roebourne 38.9 -0.1 49.4 21st 23.9 -1.0 20.1 16th 0 11.0 lowest 0%
Roebourne Aero 38.9 -0.3 49.0 21st 24.5 -0.1 21.1 2nd 0 5.6 v low 0%
Fortescue (district 05)
Barrow Island Airport 31.8 -0.2 39.2 24th 24.6 +0.3 22.6 1st 0 3.0 v low 0%
Learmonth Airport 37.7 +0.9 48.9 23rd 21.3 +0.6 16.2 2nd 0 6.5 lowest 0%
Mardie 35.8 -1.8 48.5 21st 23.6 +0.7 20.6 7th 0 8.4 lowest 0%
Onslow 34.2 -1.0 48.7 22nd 23.1 +1.5 19.4 3rd 0 5.3 lowest 0%
Onslow Airport 34.9 -1.0 49.2 22nd 22.9 +0.7 19.2 3rd 0 3.5 lowest 0%
Wittenoom 40.9 +1.3 46.0 21st 26.4 +1.0 21.5 7th 0.8 49.4 v low 2%
West Gascoyne (district 06)
Carnarvon Airport 30.4 +1.1 42.4 27th 22.1 +1.5 17.4 2nd 0 5.6 lowest 0%
Denham 30.7 +1.7 41.0 27th 22.5 +2.1 19.6 2nd 2.6 2.3 high 113%
Emu Creek Station 40.1 +0.3 48.2 24th 22.8 +0.5 17.6 7th 0 13.2 lowest 0%
Murchison 36.5 -0.8 43.0 28th 21.4 +1.5 15.7 7th 20.4 13.4 high 152%
Shark Bay Airport 33.0 +0.9 42.9 27th 20.7 +1.3 17.6 2nd 0.6 12.8 average 5%
East Gascoyne (district 07)
Newman Aero 39.6 +0.6 45.2 25th 25.0 +1.3 19.7 3rd 7.0 36.8 low 19%
Paraburdoo Aero 41.3 +1.1 46.9 25th 26.3 +2.0 20.3 9th 5.0 28.5 low 18%
Murchison (district 07A)
Meekatharra Airport 36.4 0.0 43.4 23rd 22.1 +0.1 17.8 4th 10.8 13.5 average 80%
Mount Magnet Aero 34.0 -1.5 41.4 22nd 20.9 -0.1 17.3 8th 67.0 24.3 high 276%
North Coast (district 08)
Carnamah 33.6 +0.1 38.3 29th 18.7 +2.7 13.5 19th 13.0 9.1 high 143%
Dalwallinu 33.0 -0.1 39.3 28th 16.8 +1.2 13.0 19th 12.4 14.1 average 88%
Dalwallinu Comparison 32.7 -0.2 38.4 28th 17.5 +1.5 13.3 19th 18.0 11.5 high 157%
Geraldton Airport 31.5   41.1 28th 18.5   14.1 22nd 0.6
Geraldton Airport Comparison 31.4 +1.9 40.2 28th 18.4 +2.1 14.6 17th 1.0 5.4 average 19%
Kalbarri 32.6 +1.5 42.0 27th 19.8 +2.5 14.2 21st 0.7 3.9 average 18%
Morawa Airport 34.8 -0.4 39.6 22nd 18.8 +1.6 14.1 7th 10.8 13.6 average 79%
Mullewa 34.6 +0.2 39.5 29th 19.2 +2.3 14.7 20th 1.0 8.4 average 12%
North Island 27.8 +1.6 31.8 27th 21.3 +1.6 19.9 31st 3.4 4.4 high 77%
Wongan Hills 32.7 +0.3 38.8 28th 17.0 +1.3 11.5 25th 6.6 10.2 average 65%
Central Coast (district 09)
Badgingarra Research Stn 31.9 -0.1 40.1 28th 17.0 +2.1 10.7 19th 43.4 9.7 v high 447%
Bickley 27.9 0.0 36.0 28th 15.2 +1.8 11.5 1st 41.0 13.2 highest 311%
Champion Lakes 29.5   37.9 28th 18.2   14.3 19th 65.8
Garden Island HSF 27.6 +2.4 37.9 28th 18.8 +1.9 15.9 1st 38.8 9.7 v high 400%
Gingin Aero 31.5 +1.0 40.0 28th 17.0 +2.9 11.5 19th 16.4 7.9 high 208%
Gosnells City 30.9 +0.7 39.6 28th 18.4 +2.4 13.9 19th 55.4 11.5 v high 482%
Jandakot Aero 30.1 +1.2 39.1 28th 16.7 +2.2 10.0 19th 39.0 10.5 v high 371%
Jurien Bay 30.4 +2.3 42.0 28th 17.4 +1.9 13.4 19th 12.3 6.8 high 181%
Karnet 28.0 -0.2 36.5 29th 15.3 +1.9 10.3 19th 68.2 18.2 v high 375%
Lancelin 29.7 +2.5 41.8 28th 17.4 +1.2 14.7 17th 32.0 7.9 v high 405%
Medina Research Centre 30.1 +2.2 39.6 28th 17.7 +2.8 12.9 19th 51.8 10.6 v high 489%
Pearce RAAF 30.9 +0.7 38.6 28th 17.3 +2.9 12.0 19th 65.0 10.2 highest 637%
Perth Airport 30.6 +1.7 38.8 28th 17.5 +2.7 11.5 19th 65.8 11.2 highest 588%
Perth Metro 30.5 +1.7 39.9 28th 18.2 +2.0 13.3 19th 75.8 12.8 3rd highest 592%
Rottnest Island 26.5 +1.6 36.3 28th 19.0 +1.5 16.6 7th 70.0 8.2

2nd highest

854%
Swanbourne 29.9 +2.2 40.1 28th 18.3 +1.9 15.8 10th 67.0 10.9 v high 615%
South Coast (district 09A)
Albany 22.2 +0.4 31.0 29th 15.9 +1.9 12.1 26th 60.0 29.7 high 202%
Albany Airport 23.2 +0.1 36.5 29th 13.5 +1.0 8.1 25th 61.0 27.5 high 222%
Bridgetown Comparison 28.5 +1.0 39.2 29th 13.4 +2.8 8.8 26th 25.2 18.8 average 134%
Bunbury 28.4 +1.2 37.0 28th 15.9 +2.6 10.5 21st 26.6 15.8 high 168%
Busselton Aero 29.3 +1.5 37.7 29th 14.4 +2.1 8.4 20th 14.8 8.7 v high 170%
Cape Leeuwin 23.7 +1.9 33.9 4th 17.5 +1.8 14.6 20th 13.6 21.0 average 65%
Cape Naturaliste 27.1 +3.6 34.2 28th 15.7 +1.8 12.1 20th 39.0 13.5 v high 289%
Collie East 28.2   37.5 29th 13.6   9.3 1st 44.2 14.1 v high 313%
Donnybrook 29.4 +1.2 39.5 29th 15.8 +3.5 11.5 20th 31.8 16.1 high 198%
Dwellingup 28.5 +1.3 37.5 29th 14.9 +2.4 10.7 19th 84.0 20.2 v high 416%
Esperance 24.5 0.0 37.6 30th 15.1 +0.8 9.2 1st 62.0 18.9 highest 328%
Esperance Aero 25.7 +0.2 38.1 30th 14.0 +0.7 8.2 1st 66.0 20.4 highest 324%
Harvey 29.1 +0.8 38.4 29th 15.9 +2.8 10.5 19th 41.2 14.4 v high 286%
Hopetoun North 24.1 -0.1 36.1 30th 14.8 +0.8 9.5 1st 84.4 26.2 v high 322%
Jarrahwood 28.6 +1.8 38.5 29th 13.4 +2.4 6.0 20th 22.8 16.8 high 136%
Mandurah 28.6 +2.1 37.2 28th 19.0 +2.2 15.8 1st 104.4 15.5 v high 674%
Manjimup 26.6 +1.8 39.0 29th 13.2 +1.6 9.3 20th 24.6 25.3 average 97%
North Walpole 23.5   35.5 29th 14.0   9.8 26th 56.0
Pemberton 25.9 +2.1 38.2 29th 13.6 +1.7 9.2 20th 16.1 34.6 average 47%
Rocky Gully 25.5 +0.2 38.2 29th 12.7 +1.7 7.8 25th 35.6 32.4 average 110%
Shannon 24.9 +0.5 38.2 29th 13.0 +1.8 8.3 25th 28.6 29.4 average 97%
Windy Harbour 23.1 +1.2 33.4 29th 13.5 +0.5 8.5 11th 24.4 28.3 average 86%
Witchcliffe 26.7 +2.3 38.0 29th 13.6 +1.4 7.9 20th 16.2 14.4 average 113%
North Central (district 10)
Bencubbin 31.8 -0.6 38.6 22nd 17.4 +1.5 13.7 2nd 42.2 13.4 v high 315%
Cunderdin Airfield 32.7 +0.1 40.6 29th 16.3 +1.7 13.3 1st 17.6 8.4 high 210%
Kellerberrin 31.8 -0.2 39.0 29th 16.0 +1.0 12.0 2nd 68.9 13.4 v high 514%
Merredin 31.8 -0.1 39.0 22nd 17.2 +1.5 13.5 26th 53.6 14.1 v high 380%
Northam 32.4 +0.3 39.5 29th 16.5 +1.2 12.8 1st 16.4 9.3 high 176%
York 31.9 -0.1 40.0 29th 15.6 +1.7 10.5 1st 23.0 12.2 high 189%
South Central (district 10A)
Beverley 31.8 -0.3 39.8 29th 16.0 +1.7 11.8 1st 42.0 10.4 v high 404%
Brookton 30.4 -0.5 39.6 29th 15.9 +2.5 12.1 1st 32.6 10.4 v high 313%
Corrigin 29.9 -0.5 38.4 29th 15.8 +1.9 11.5 1st 42.4 13.1 v high 324%
Hyden 30.3 -1.5 39.5 30th 15.5 +1.7 11.7 1st 138.0 15.1 highest 914%
Jacup 24.9 -1.0 36.2 29th 12.5 +1.1 8.2 1st        
Katanning 28.0 -0.3 37.6 29th 13.4 +1.9 9.7 26th 82.8 24.0 v high 345%
Katanning Comparison 28.0 -0.4 38.0 29th 13.6 +1.5 10.0 20th 85.4 16.6 highest 514%
Lake Grace 28.0 -1.3 37.4 29th 15.0 +1.7 10.6 1st 91.2 19.8 v high 461%
Lake Grace Comparison 28.0 -1.6 37.6 29th 14.9 +1.5 10.5 1st 93.4 15.0 highest 623%
Narembeen 31.7 -0.2 38.9 29th 16.6 +2.2 12.1 18th 104.0 13.0 highest 800%
Narrogin 28.3 -0.6 37.5 29th 14.6 +2.3 9.8 1st 143.1 14.1 highest 1015%
Newdegate Research Station 28.2 -0.9 37.5 30th 13.6 +2.0 9.1 26th 136.0 15.3 highest 889%
Ongerup 26.0 -1.1 36.8 29th 13.7 +1.3 9.6 1st 70.6 17.2 v high 410%
Pingelly 29.3 -0.6 38.2 29th 15.6 +1.8 11.9 1st 101.8 12.6 highest 808%
Ravensthorpe 25.8 -1.4 36.8 30th 13.7 +1.0 8.4 1st 135.6 23.6 v high 575%
Wagin 28.8 -0.4 38.9 29th 14.4 +1.5 10.1 1st 105.6 12.7 highest 831%
Wandering 29.1 -1.1 38.9 29th 14.1 +2.3 7.4 1st 127.8 19.3 v high 662%
Eucla (district 11)
Balladonia 28.8 -1.4 40.0 30th 14.7 +1.5 9.6 27th 15.4 18.5 average 83%
Eucla 25.9 +1.1 44.5 31st 16.3 +1.3 10.5 12th 30.4 18.3 high 166%
Eyre 24.7 -0.6 34.5 31st 13.6 -0.5 4.6 11th 75.0 20.0 v high 375%
Forrest 31.7 +0.6 43.5 31st 14.8 -0.1 8.8 1st
Red Rocks Point 23.0   35.6 31st 17.4   12.3 12th 62.8 18.3 v high 343%
South East (district 12)
Bulga Downs 34.0   41.7 23rd 18.9   13.8 2nd 57.6 13.4 v high 430%
Kalgoorlie-Boulder Airport 30.7 -1.2 41.5 30th 17.2 +0.6 11.7 1st 24.2 16.5 high 147%
Laverton Aero 32.6 -0.7 42.3 23rd 19.0 -0.5 14.5 14th 35.8 28.0 high 126%
Leinster Aero 33.9 -1.2 43.1 23rd 20.6 -0.4 15.7 16th 29.4 28.6 high 103%
Leonora 33.3 -2.0 43.2 23rd 19.4 -0.6 15.4 14th 30.2 16.8 high 180%
Leonora Aero 33.0   42.6 23rd 19.7   15.5 14th 27.2
Munglinup West 26.2   37.0 30th 13.6   8.4 1st 85.2
Norseman Aero 29.5 -1.4 40.1 22nd 15.4 +1.8 10.2 1st 41.2 25.5 high 162%
Salmon Gums Res.Stn. 28.8 -0.1 41.0 22nd 13.6 +1.4 4.1 26th 34.2 20.2 high 169%
Southern Cross Airfield 30.8 -1.9 38.3 30th 16.7 +1.6 12.6 17th 91.4 17.4 v high 525%
Yeelirrie 35.2 -0.9 43.5 23rd 19.9 0.0 14.6 16th 21.5 20.4 average 105%
North East (district 13)
Carnegie 36.3 -1.0 44.1 24th 20.4 -1.6 16.5 2nd 35.2 24.0 high 147%
Giles Meteorological Office 34.7 -1.0 40.9 25th 20.5 -1.4 13.3 4th
Telfer Aero 41.0 +0.8 46.4 21st 25.3 0.0 19.6 3rd 22.2 47.6 average 47%
Warburton Airfield 35.1 -1.5 43.1 24th 20.6 -0.6 14.2 4th 47.0 31.9 high 147%
Wiluna 35.3 -1.5 44.5 24th 21.2 +0.1 15.2 3rd 94.5 22.3 v high 424%
Offshore Islands (district 200)
Christmas Island Aero 28.1 +0.4 29.9 27th 23.1 +0.6 21.6 3rd 358.0 214.6 high 167%
Cocos Island Airport 29.7 +0.3 30.9 8th 25.2 +0.7 23.1 7th 162.4 115.6 high 140%
Varanus Island 31.4 +0.3 37.0 21st 24.7 0.0 23.1 7th 0 2.1 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 Tuesday 3 January 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

Media
(03) 9669 4057
Enquiries