Western Australia in summer 2009-10: Record hot summer for WA

  • Highest mean temperature on record
  • Equal highest mean maximum temperature
  • Highest mean minimum temperature
  • Near average rainfall

Rainfall

Below average rainfall was experienced in large parts of western and central WA during summer 2009-10, with very much below average rainfall recorded mainly near the Southwest Land Division (SWLD) west coast. Above average summer rainfall was confined to parts of the Kimberley, far eastern Pilbara, and Interior with small pockets of very much above average rainfall in the north and west Kimberley and far east Pilbara (see summer 2009-10 rainfall decile map). For Western Australia as a whole, summer 2009-10 rainfall was near average.

Below average levels of thunderstorm activity in the south of the state caused the driest summer on record for many sites across the western Southwest Land Division (SWLD), and some did not register any measurable rainfall for the entire summer. A quiet monsoon season also saw lowest on record rainfall for summer in parts of the inland Pilbara. Only two tropical cyclones impacted on WA during the summer of 2009-10, a lower than normal level of summertime tropical cyclone activity for WA, however TC Laurence in December, and TC Magda in January, both crossed the west Kimberley coast as severe tropical cyclones. Some sites in the west Kimberley recorded highest daily rainfall recordings for summer with the passage nearby of TC Laurence.

Some sites had their highest summer daily rainfall on record. Some sites had their lowest total summer rainfall on record .

Temperature

The mean temperature for WA this summer was 29.6°C, which was 0.2°C above the previous hottest summer of 1997-98, and 1.3°C above the long-term summer average of 28.3°C. The record hot summer was the result of a sucession of very hot months with WA recording its third hottest December in terms of mean temperature, its second hottest January, and its third hottest February.

Maximum temperature

Apart from small areas of below average to near average mean maximum temperatures in some coastal regions and near the WA/NT border, summer 2009-10 saw above to very much above average mean maximum temperatures across most of Western Australia, with sites in the Goldfields, Eucla and SWLD recording their highest summer mean maximum temperatures on record. Maximum temperatures up to 5°C above normal were recorded in the inland Pilbara. The statewide mean maximum temperature for summer 2009-10 was 36.7°C, which was 1.5°C above the long-term average and the equal highest on record, along with the summer of 1997-98.

Some sites had their highest summer temperature on record. Some sites had their highest mean summer temperature on record

Minimum temperature

Apart from near average summer mean minimum temperatures in coastal regions of western and southern of WA, as well as a small part of the Kimberley, above to very much above average mean minima were experienced across the majority of the state. A small number of sites scattered across the state recorded their highest summer mean minimum temperature on record, whilst parts of the inland Pilbara and Gascoyne, Goldfields, southern Interior and Eucla registered mean minima up to 3°C higher than normal. Overall, the statewide mean minimum temperature for summer was 22.5°C, which was 1.1°C above the long-term average and the highest since comparable records commenced in 1950.

Some sites had their warmest summer night (highest daily minimum temperature) on record. Some sites had their highest mean minimum temperature on record .

Further information

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Extremes in summer 2009-10
Hottest day 49.2 °C at Onslow on 1 Jan 2010
Warmest days on average 42.9 °C at Paraburdoo Aero
Coolest days on average 22.3 °C at Albany
Coldest day 16.4 °C at Rocky Gully on 20 Jan 2010
Coldest night 0.2 °C at Eyre on 9 Dec 2009
Coolest nights on average 11.7 °C at Rocky Gully
Warmest nights on average 27.5 °C at Troughton Island
27.1 °C at Wittenoom (mainland)
Warmest night 34.6 °C at Paraburdoo Aero on 2 Jan 2010
Wettest overall 1128.4 mm at Theda
Wettest day 402.0 mm at Napier Downs on 18 Dec 2009
Highest wind gust 187 km/h at Troughton Island on 15 Dec 2009
124 km/h at Wyndham Aero (mainland) on 31 Jan 2010

Record highest summer daily rainfall
Highest daily rainfall
in summer 2009-10 (mm)
Previous highest
for summer
Years of
record
Kimberley Downs 310.6 on 18 Dec 2009 224.0 on 24 Jan 1967 97
Warrawagine 244.5 on 22 Dec 2009 190.4 on 15 Dec 1998 93
Napier Downs 402.0 on 18 Dec 2009 255.8 on 28 Feb 1946 92



Record lowest total summer rainfall
Total rainfall
for summer 2009-10 (mm)
Previous lowest
for summer
Years of
record
Average for
summer
Bridgetown Comparison 2.6 2.9 in 1910 123 47.0
Greenbushes 3.5 4.2 in 1994 116 50.0
Nannup 1.0 1.4 in 1974 106 47.2
Manjimup 9.0 14.2 in 1963 94 63.2
Margaret River 7.3 8.7 in 1974 80 46.4
Perth Airport 0.0 0.5 in 1974 66 34.0
Meekatharra Airport 4.2 4.6 in 1955 65 74.5
Walpole 24.1 27.5 in 1986 59 93.6
Pearce RAAF 0.0 0.2 in 1997 44 26.2
Bickley 1.2 3.0 in 2003 39 49.1
Jandakot Aero 0.2 0.5 in 1973 35 42.6
Mosman Park 0.2 0.4 in 1974 33 33.4
Perth Metro 0.2 0.8 in 1975 134 35.1
Mosman Park 0.2 0.4 in 1974 33 33.4




Record highest summer temperature
Highest temperature
in summer 2009-10 (°C)
Previous highest
for summer
Years of
record
Average for
summer
Kimberley Res.Station 44.0 on 6 Dec 2009 43.9 on 16 Dec 1985 59 36.3
Esperance 46.9 on 6 Jan 2010 46.7 on 1 Feb 1991 41 25.6
Learmonth Airport 48.9 on 2 Jan 2010 48.2 on 21 Jan 2003 35 37.4



Record highest summer mean daily maximum temperature
Mean daily maximum
temperature
for summer 2009-10 (°C)
Previous highest
for summer
Years of
record
Average for
summer
Northam 35.9 35.6 in 1984 104 33.3
Dwellingup 31.6 31.0 in 1977 68 28.7
Kalgoorlie-Boulder Airport 35.2 35.0 in 1997 67 32.5
Carnamah 37.3 36.8 in 1979 66 35.0
Perth Airport 33.4 32.9 in 1977 65 30.7
Salmon Gums Res.Stn. 32.3 32.1 in 1972 65 29.7
Corrigin 34.1 33.3 in 1997 59 31.4
Eyre 29.3 28.3 in 2006 48 26.0
Merredin 35.9 35.4 in 1997 43 32.9
Esperance 27.4 27.1 in 1982 40 25.6
Wongan Hills 36.2 35.7 in 1997 40 33.6
Narembeen 35.7 35.2 in 1997 38 32.9
Beverley 35.6 35.5 in 1997 37 33.2
Pingelly 33.3 32.7 in 1997 36 31.0
Wagin 32.2 31.6 in 1997 34 30.1
Hyden 35.5 34.7 in 1997 33 32.7




Record highest summer daily minimum temperature
Highest daily minimum
temperature
in summer 2009-10 (°C)
Previous highest
for summer
Years of
record
Average for
summer
Geraldton Airport 30.3 on 28 Feb 2010 29.8 on 28 Jan 1962 68 17.9
Halls Creek Airport 31.8 on 9 Dec 2009 31.6 on 15 Dec 1985 66 24.2
Balladonia 27.8 on 10 Jan 2010 25.0 on 2 Feb 1993 45 14.2



Record highest summer mean daily minimum temperature
Mean daily minimum
temperature
for summer 2009-10 (°C)
Previous highest
for summer
Years of
record
Average for
summer
Badgingarra Research Stn 17.7 17.5 in 2007 37 16.4
Yeelirrie 23.4 22.7 in 1977 34 21.0
Warburton Airfield 24.1 23.7 in 1954 33 21.9



Summary statistics for summer 2009-10
Maximum temperatures
for summer
(°C)
Minimum temperatures
for summer
(°C)
Rainfall
for summer
(millimetres)
Mean for
summer
2009-10
Diff
from
average
Highest for
summer
2009-10
Mean for
summer
2009-10
Diff
from
average
Lowest for
summer
2009-10
Total for
summer
2009-10
Average
for
summer
Rank of
summer
2009-10
Fraction of
summer
average
North Kimberley (district 01)
Doongan 34.2   40.2 8 Dec 2009 23.4   19.5 30 Jan 2010 847.2
Kalumburu 34.7   40.3 6 Dec 2009 25.1   22.7 30 Jan 2010 851.8
Mount Elizabeth 34.2   40.9 8 Dec 2009 22.6   19.3 20 Feb 2010 614.2 645.4 average 95%
Troughton Island 32.7   34.9 13 Dec 2009 27.5   23.5 23 Feb 2010 982.4
Truscott 32.9   37.3 5 Dec 2009 26.1   22.2 30 Jan 2010 1008.2
Wyndham 37.5 +0.5 44.0 7 Dec 2009 26.7 +0.3 23.2 24 Feb 2010 573.8 535.1 average 107%
Wyndham Aero 37.6   45.4 7 Dec 2009 26.5   21.7 1 Feb 2010 506.4
East Kimberley (district 02)
Argyle Aerodrome 37.7   44.7 6 Dec 2009 26.1   22.1 4 Feb 2010 504.4
Halls Creek Airport 37.5 +0.8 44.6 7 Dec 2009 24.9 +0.7 21.1 4 Dec 2009 336.4 377.4 average 89%
Kununurra Aero 36.3   44.4 8 Dec 2009 25.0   20.0 4 Dec 2009 539.2 547.8 average 98%
Warmun 38.2 +0.9 45.7 7 Dec 2009 25.5 +0.7 19.1 5 Dec 2009 516.3 469.6 average 110%
West Kimberley (district 03)
Bidyadanga 35.0 +0.5 44.5 1 Dec 2009 26.3 +0.5 20.1 1 Dec 2009 303.5 313.2 average 97%
Broome Airport 33.7 +0.4 42.0 1 Dec 2009 27.0 +0.8 21.7 16 Feb 2010 325.8 408.8 average 80%
Curtin Aero 37.7   45.6 4 Dec 2009 25.3   19.1 1 Dec 2009 531.6
Derby Aero 35.9   42.7 13 Dec 2009 26.0   19.2 1 Dec 2009 530.8 458.4 average 116%
Fitzroy Crossing Aero 39.0   45.7 9 Dec 2009 25.4   21.9 5 Dec 2009 357.0
West Roebuck 34.9   44.9 1 Dec 2009 25.9   21.7 16 Feb 2010 377.0
De Grey (district 04)
Bedout Island 33.2   37.0 27 Feb 2010 27.2   23.0 18 Dec 2009
Karratha Aero 36.9   45.2 16 Dec 2009 26.4   22.8 7 Feb 2010 3.8 128.3 low 3%
Legendre Island 32.8   37.8 17 Jan 2010 26.2   24.2 24 Dec 2009 0
Marble Bar     46.9 7 Dec 2009 26.6   22.0 25 Jan 2010 134.8
Pardoo Station 37.6   45.2 7 Dec 2009 25.5   20.5 8 Jan 2010 169.1 157.9 average 107%
Port Hedland Airport 37.8 +1.4 45.5 2 Jan 2010 25.9 +0.9 21.9 7 Feb 2010 20.2 169.6 low 12%
Roebourne 41.2 +2.7 47.2 16 Feb 2010 26.0 +0.2 19.0 24 Dec 2009 32.3 136.1 average 24%
Roebourne Aero 40.7   46.6 7 Dec 2009 26.0   22.0 23 Dec 2009 42.8
Fortescue (district 05)
Barrow Island Airport 32.1   40.0 2 Jan 2010 24.8   21.5 6 Feb 2010 0.4
Learmonth Airport 38.3 +0.9 48.9 2 Jan 2010 22.1 -0.4 17.8 6 Feb 2010 33.6 76.5 average 44%
Mardie 37.5 -0.2 49.0 1 Jan 2010 24.6 +0.2 20.1 7 Feb 2010 5.4 102.6 low 5%
Onslow 35.1 -0.4 49.2 1 Jan 2010 23.9 +0.7 19.0 7 Feb 2010 17.2 84.2 average 20%
Onslow Airport 36.5 +0.3 48.8 1 Jan 2010 23.7 0.0 19.7 3 Dec 2009 13.6 104.4 low 13%
Thevenard Island 32.5   41.6 10 Dec 2009 24.5   22.1 2 Dec 2009 13.8
Wittenoom 41.9 +2.9 46.5 1 Jan 2010 27.1 +1.5 21.5 24 Dec 2009 82.8 261.6 low 32%
West Gascoyne (district 06)
Carnarvon Airport 30.8 -0.1 40.3 12 Dec 2009 22.1 0.0 17.4 12 Dec 2009 5.0 33.0 average 15%
Denham 30.3   43.1 28 Feb 2010 22.6   19.0 12 Jan 2010 0.4 23.5 low 2%
Emu Creek Station 42.0 +1.6 49.1 2 Jan 2010 23.9 0.0 19.3 6 Feb 2010 36.3 124.6 low 29%
Gascoyne Junction 41.6 +1.9 47.3 19 Feb 2010 23.9 +0.8 15.0 23 Dec 2009 8.7 55.9 low 16%
Murchison 41.0   46.2 18 Feb 2010 22.7   17.0 11 Dec 2009 10.7
Shark Bay Airport 33.9   46.7 18 Jan 2010 21.1   17.4 3 Dec 2009 0.6
East Gascoyne (district 07)
Newman Aero 41.4   45.5 21 Feb 2010 26.4   19.7 9 Dec 2009 23.2 174.7 v low 13%
Paraburdoo Aero 42.9   47.4 21 Feb 2010 26.9   20.9 24 Dec 2009 23.2 153.5 v low 15%
Murchison (district 07A)
Meekatharra Airport 40.3 +3.2 44.4 19 Feb 2010 25.5 +2.2 17.3 9 Dec 2009 4.2 74.5 lowest 6%
North Coast (district 08)
Carnamah 37.3 +2.3 46.0 5 Jan 2010 19.1 +1.3 12.5 15 Dec 2009 1.6 34.9 v low 5%
Dalwallinu 36.6   45.6 29 Dec 2009 18.0   11.3 15 Dec 2009 43.4
Dalwallinu Comparison 36.3 +2.1 44.6 29 Dec 2009 18.9 +1.3 11.4 15 Dec 2009 50.0 42.6 average 117%
Geraldton Airport 32.8 +1.6 45.8 18 Jan 2010 18.1 +0.2 11.7 10 Dec 2009 0.4 21.8 v low 2%
Kalbarri 33.9 +1.1 45.4 18 Jan 2010 19.4 +0.3 13.9 15 Dec 2009 0 14.3 lowest 0%
Morawa Airport 38.7   46.8 29 Dec 2009 19.5   13.8 1 Dec 2009 10.0
North Island 27.8   36.8 28 Feb 2010 21.0   18.3 1 Dec 2009 0
Wongan Hills 36.2 +2.6 45.0 29 Dec 2009 17.9 +0.7 11.5 8 Dec 2009 8.8 39.0 low 23%
Central Coast (district 09)
Badgingarra Research Stn 35.2 +1.5 44.6 26 Feb 2010 17.7 +1.3 12.0 2 Dec 2009 0.2 33.2 lowest 1%
Bickley 31.7   41.8 18 Jan 2010 15.6   9.4 2 Dec 2009 1.2 49.1 lowest 2%
Champion Lakes 32.4   41.5 17 Jan 2010 18.6   12.4 2 Dec 2009 0.4
Garden Island HSF 27.5   40.4 17 Jan 2010 18.6   13.3 8 Dec 2009 1.6
Gingin Aero 34.1   44.3 18 Jan 2010 16.3   7.8 15 Dec 2009 1.2
Gooseberry Hill 33.2   43.6 18 Jan 2010 17.3   11.2 8 Dec 2009
Gosnells City 34.0   43.8 17 Jan 2010 18.6   11.5 3 Feb 2010 4.0 38.1 v low 10%
Jandakot Aero 32.9   43.0 18 Jan 2010 16.7   7.8 3 Feb 2010 0.2 42.6 lowest 0%
Karnet 31.5 +1.8 40.2 18 Jan 2010     9.0 2 Dec 2009 3.0 54.0 lowest 6%
Lancelin 30.4 +1.8 44.5 26 Feb 2010 17.5 +0.3 11.3 3 Dec 2009 8.0 27.7 average 29%
Medina Research Centre 31.8   43.8 17 Jan 2010 17.4   10.7 3 Feb 2010 5.0
Pearce RAAF 34.4 +2.2 44.2 18 Jan 2010 17.1 +0.9 8.9 5 Feb 2010 0 26.2 lowest 0%
Perth Airport 33.4 +2.7 43.2 18 Jan 2010 17.4 +1.0 9.1 2 Dec 2009 0 34.0 lowest 0%
Perth Metro 32.0 1.8 42.9 17 Jan 2010 18.0 0.7 12.3 5 Feb 2010 0.2 35.1 lowest 1%
Rottnest Island 26.6   41.1 17 Jan 2010 19.0   14.0 8 Dec 2009 3.4
Swanbourne 30.7   42.9 17 Jan 2010 18.1   12.3 3 Feb 2010 0.2
South Coast (district 09A)
Albany 22.3 -0.2 38.9 18 Jan 2010 16.3 +1.5 9.9 11 Dec 2009 32.8 76.2 v low 43%
Albany Airport 24.3 +0.1 40.7 18 Jan 2010 13.7 +0.2 4.7 11 Dec 2009 41.2 73.4 low 56%
Bridgetown 29.9   40.2 18 Jan 2010 12.1   3.3 3 Feb 2010 0.8
Bridgetown Comparison 30.7 +1.7 41.0 18 Jan 2010 13.1 +1.5 4.8 17 Dec 2009 2.6 47.0 lowest 6%
Bunbury 30.4   40.6 17 Jan 2010 14.8   6.6 2 Dec 2009 1.0
Busselton 29.6   37.5 17 Jan 2010 14.2   7.6 2 Dec 2009 7.6
Busselton Aero 30.3   39.4 17 Jan 2010 13.2   5.3 3 Feb 2010 0.8
Cape Leeuwin 23.0 +0.3 28.4 17 Jan 2010 17.3 +0.7 13.6 8 Dec 2009 14.4 53.2 v low 27%
Cape Naturaliste 26.6 +1.7 37.8 17 Jan 2010 15.1 +0.2 9.7 10 Dec 2009 7.4 34.9 v low 21%
Collie East 31.8   40.4 18 Jan 2010 13.1   5.7 3 Feb 2010 12.0
Donnybrook 31.8 +2.1 41.5 17 Jan 2010 15.0 +1.5 8.2 3 Dec 2009 5.4 42.9 v low 13%
Dwellingup 31.6 +2.9 40.4 18 Jan 2010 14.6 +0.9 8.1 3 Feb 2010 3.9 56.8 v low 7%
Esperance 27.4 +1.8 46.9 6 Jan 2010 16.0 +0.7 9.3 4 Dec 2009 32.2 70.0 low 46%
Esperance Aero 28.7   46.4 6 Jan 2010 15.0   8.8 3 Dec 2009 58.8 71.1 average 83%
Harvey 32.1   41.2 17 Jan 2010 15.5   8.5 10 Dec 2009 2.6
Hopetoun North 25.0   48.0 6 Jan 2010 15.3   8.6 12 Dec 2009 31.8
Jarrahwood 30.6   40.5 17 Jan 2010 12.3   3.5 17 Dec 2009 9.2 42.7 low 22%
Mandurah 30.1   39.3 25 Feb 2010 18.8   13.6 8 Dec 2009 3.2
Manjimup 27.9 +1.6 40.8 18 Jan 2010 12.8 +0.1 7.0 8 Dec 2009 9.0 63.2 lowest 14%
North Walpole 24.2   35.7 18 Jan 2010 14.0   8.5 11 Dec 2009 26.6
Pemberton 27.0 +1.6 38.9 17 Jan 2010 13.0 +0.1 7.1 8 Dec 2009 15.6 75.7 v low 21%
Rocky Gully 27.2   39.7 6 Jan 2010 11.7   5.1 8 Dec 2009 22.6
Shannon 26.4   38.5 18 Jan 2010 12.4   5.1 8 Dec 2009 14.2
Witchcliffe 26.6   39.3 17 Jan 2010 13.3   5.8 8 Dec 2009 5.8
North Central (district 10)
Cunderdin Airfield 36.2   46.9 29 Dec 2009 16.7   9.4 10 Dec 2009 3.0
Merredin 35.9 +3.0 45.2 6 Jan 2010 18.0 +0.9 10.5 10 Dec 2009 12.9 43.0 low 30%
Northam 35.9 +2.6 45.4 29 Dec 2009 17.1 +0.6 10.9 10 Dec 2009 1.4 32.9 v low 4%
York 35.3   45.5 29 Dec 2009 15.5   8.4 10 Dec 2009 7.0
South Central (district 10A)
Beverley 35.6 +2.4 44.4 18 Jan 2010 16.1 +0.4 9.4 10 Dec 2009 12.2 35.1 average 35%
Brookton 34.1 +2.1 43.2 29 Dec 2009 15.5 +0.6 8.5 10 Dec 2009 2.9 37.2 v low 8%
Corrigin 34.1 +2.7 43.7 29 Dec 2009 15.7 +0.5 9.3 8 Dec 2009 8.1 45.8 low 18%
Hyden 35.5 +2.8 47.0 9 Jan 2010 15.1 +0.1 7.0 8 Dec 2009 5.6 52.7 v low 11%
Jacup 28.6   46.1 6 Jan 2010     4.7 11 Dec 2009 54.8
Katanning 30.6   42.4 18 Jan 2010 12.8   6.2 3 Dec 2009 31.6
Katanning Comparison 31.0 +1.6 42.2 18 Jan 2010 13.2 0.0 6.4 3 Dec 2009 15.2 45.9 low 33%
Lake Grace 32.2   44.4 6 Jan 2010 14.6   8.1 11 Dec 2009 3.0
Lake Grace Comparison 32.1 +1.5 43.8 6 Jan 2010 14.7 +0.2 7.8 11 Dec 2009 3.0 51.2 v low 6%
Narembeen 35.7 +2.8 45.3 9 Jan 2010 16.3 +0.5 9.0 8 Dec 2009 36.5 45.7 average 80%
Narrogin 32.2 +2.2 42.2 18 Jan 2010 14.6 +1.1 8.2 8 Dec 2009 5.0 41.8 low 12%
Newdegate Research Station 32.3   45.7 6 Jan 2010 12.8   4.9 17 Dec 2009 5.0 54.1 v low 9%
Ongerup 29.5 +1.6 43.0 18 Jan 2010 13.7 +0.2 7.0 11 Dec 2009 18.2 53.7 low 34%
Pingelly 33.3 +2.3 42.6 18 Jan 2010 15.2 +0.1 9.1 10 Dec 2009 3.6 36.3 low 10%
Ravensthorpe 29.1 +1.0 45.4 6 Jan 2010 14.1 +0.4 7.1 11 Dec 2009 46.8 72.2 average 65%
Wagin 32.2 +2.1 43.1 18 Jan 2010 14.0 0.0 7.7 24 Dec 2009 2.4 39.8 v low 6%
Wandering 33.7   43.6 18 Jan 2010 13.3   5.1 8 Dec 2009 4.0
Eucla (district 11)
Balladonia 32.9 +2.2 45.6 19 Feb 2010 15.7 +1.5 8.0 12 Dec 2009 20.4 56.8 low 36%
Eucla 28.2 +2.8 45.4 15 Dec 2009 17.3 +1.1 6.9 9 Dec 2009 49.6 51.6 average 96%
Eyre 29.3 +3.3 46.1 30 Dec 2009 14.7 -0.5 0.2 9 Dec 2009 33.7 51.2 average 66%
Forrest 33.6   44.3 15 Dec 2009 16.7   8.5 18 Dec 2009 40.6
South East (district 12)
Bulga Downs 39.5   46.5 15 Feb 2010 22.6   15.2 10 Dec 2009 41.5 69.1 average 60%
Kalgoorlie-Boulder Airport 35.2 +2.7 45.0 20 Jan 2010 19.3 +1.8 10.7 10 Dec 2009 52.8 70.9 average 74%
Laverton Aero 36.9   44.1 20 Jan 2010 22.4   13.0 4 Feb 2010 43.2
Leinster Aero 38.7   44.8 20 Jan 2010 24.0   14.2 8 Dec 2009 21.2
Leonora 38.0 +2.1 46.5 20 Jan 2010 22.5 +1.6 14.1 10 Dec 2009 31.0 70.5 average 44%
Leonora Aero 37.9   45.5 20 Jan 2010 23.0   14.3 10 Dec 2009 27.4
Munglinup West 29.2   47.6 6 Jan 2010 14.1   7.9 17 Dec 2009 97.6
Norseman Aero 34.1   44.8 6 Jan 2010 15.8   6.1 9 Dec 2009 39.4
Salmon Gums Res.Stn. 32.3 +2.6 45.7 6 Jan 2010 14.0 +0.7 2.2 8 Dec 2009 49.2 70.3 average 70%
Southern Cross Airfield 35.9   45.7 6 Jan 2010 17.6   8.5 10 Dec 2009 13.2
Yeelirrie 39.4 +2.7 45.2 20 Jan 2010 23.4 +2.4 14.5 9 Dec 2009 16.5 78.1 low 21%
North East (district 13)
Balgo Hills 39.0   45.5 9 Dec 2009 25.1   18.0 21 Dec 2009 188.3 211.6 average 89%
Carnegie 39.7   44.6 30 Dec 2009 23.9   16.9 9 Dec 2009 54.3 107.3 average 51%
Giles Meteorological Office 37.0 +0.7 43.0 7 Dec 2009 23.3 +0.6 15.1 25 Dec 2009 108.6 117.8 average 92%
Telfer Aero 41.3 +1.5 46.5 1 Jan 2010 26.7 +1.1 22.0 2 Feb 2010 143.4 197.5 average 73%
Warburton Airfield 38.7 +1.8 44.7 6 Dec 2009 24.1 +2.2 16.1 25 Dec 2009 46.6 95.3 average 49%
Wiluna 39.8 +2.7 44.0 5 Jan 2010 24.5 +2.5 15.5 9 Dec 2009 25.5 94.3 low 27%

Notes

The 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 3 pm on Tuesday 2 March 2010. 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 30 years of record, as they cannot then be calculated reliably.
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.

Further information

Media
(03) 9669 4057
Enquiries