Western Australia in December 2010: Record wet month in the northwest

  • Rainfall: Above average for WA, near average in southwest WA.
  • Maximum temperature: Near average.
  • Minimum temperature: Above average.

Rainfall

Rainfall was above average for WA as a whole in December, mainly as a result of record high rainfall in the third week of the month in the Gascoyne and adjacent parts of neighbouring districts. Above average rainfall was also recorded in parts of the Kimberley, whilst below average rainfall was reported in parts of the southern Interior and the Eucla (see December rainfall totals & decile maps). The Lower Southwest region of WA (southwest of a line from Jurien Bay to Bremer Bay) recorded near average rainfall in December.

A monsoon low developed on 15 December, about 520 kilometres northwest of Exmouth, moving slowly southeast and crossing the Gascoyne coast on the 18th. Heavy rainfall began in the Gascoyne during the 16th and continued until the 18th, with large parts of the west Gascoyne recording over 150 mm and a few sites recording over 300 mm. The significance of the rainfall event can be put in context by the fact that the December mean rainfall for the region is in the order of 5 mm, whilst mean annual rainfall is between 200 mm and 300 mm. Several locations recorded their annual average rainfall in one or two days during the event and many locations broke their December daily and monthly rainfall record during the event. Carnarvon Airport recorded 207.8 mm in the 24 hours to 9am on the 17th, which is the wettest day on record for Carnarvon since records commenced in 1883, easily breaking the previous record of 119.4 mm observed at the Post Office on the 24th March 1923. The average rainfall for December for Carnarvon Airport is 1.8 mm, whilst the annual average rainfall is 226.7 mm. Carnarvon also registered its wettest month on record, with a December total of 255.0 mm at Carnarvon Airport, breaking the previous record of 219.7 mm recorded at the Post Office in June 1895.

Maximum temperature

Mean maximum temperatures were above average in December in the Interior and adjacent parts of the Gascoyne and Pilbara, as well as near the WA west coast, with mean maximum temperatures up to 3 °C above normal in the central Interior. In contrast, the east Kimberley, coastal Pilbara, inland Gascoyne, eastern Southwest Land Division (SWLD) and Eucla recorded below average mean maxima, with up to 3 °C below normal mean maxima along parts of the WA south coast (see December maximum temperature decile & anomaly maps). When averaged over the whole state, December 2010 was near average in terms of mean maximum temperature.

Meakatharra Airport recorded its lowest daily maximum temperature for December on record on the 17th as a result of heavy rainfall. Western parts of the SWLD experienced hot and humid conditions during the Christmas and New Year period, and Eneabba in the Central West recorded its hottest December day on record on the 27th with 45.9 °C.

Minimum temperature

Mean minimum temperatures in December were above to very much above average across large parts of WA, particularly in the western Pilbara and northwest Gascoyne where minimum temperatures were up to 3 °C above normal. Learmonth Airport recorded its highest mean minimum temperature for December on record. Giles in the eastern Interior recorded its highest December overnight temperature on record on the last day of the month.

In contrast, much of the Kimberley recorded below average to very much below average mean minima (see December minimum temperature decile & anomaly maps), however when averaged over the whole state, mean minimum temperatures in December 2010 were above average.

Further information

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Extremes in December 2010
Hottest day 47.6 °C at Gascoyne Junction on the 27th
Warmest days on average 41.7 °C at Marble Bar
Coolest days on average 20.3 °C at Albany
Coldest day 15.5 °C at Ravensthorpe on the 2nd
Coldest night 1.7 °C at Salmon Gums Res.Stn. on the 10th
Coolest nights on average 11.4 °C at Salmon Gums Res.Stn.
Warmest nights on average 27.3 °C at Broome Airport
Warmest night 32.1 °C at Warburton Airfield on the 31st
Wettest overall 378.4 mm at Troughton Island
342.2 mm at Theda (mainland)
Wettest day 207.8 mm at Carnarvon Airport on the 17th
Highest wind gust 98 km/h at Perth Airport on the 26th

Record highest December daily rainfall
Highest daily rainfall
in December 2010 (mm)
Previous highest
for December
Years of
record
Boolardy 85.4 on the 18th 58.4 on the 11th in 2007 115
Denham 80.6 on the 17th 31.3 on the 12th in 1995 108
Cue 70.0 on the 18th 52.8 on the 19th in 1932 105
Mullewa 46.0 on the 18th 35.8 on the 27th in 1983 105
Tamala 24.2 on the 18th 22.0 on the 13th in 1995 105
Burnerbinmah 48.0 on the 18th 36.0 on the 10th in 1981 104
Mileura 110.0 on the 18th 40.0 on the 7th in 1998 104
Milly Milly 70.0 on the 17th 53.0 on the 12th in 2007 102
Gascoyne Junction 111.6 on the 18th 54.1 on the 17th in 1932 100
Marron 166.4 on the 17th 89.6 on the 13th in 1995 99
Mount Narryer 140.0 on the 18th 45.7 on the 19th in 1932 98
Winderie 134.0 on the 18th 87.0 on the 13th in 1995 97
Yuna 38.5 on the 19th 34.0 on the 31st in 1988 97
Twin Peaks 163.0 on the 18th 78.0 on the 1st in 1983 90
Cardabia 40.0 on the 17th 36.8 on the 11th in 1973 88
Yaringa Station 179.0 on the 17th 52.6 on the 13th in 1995 79
Carey Downs 120.0 on the 18th 44.5 on the 3rd in 1967 74
Eudamullah 168.0 on the 18th 35.3 on the 17th in 1932 73
Carnarvon Airport 207.8 on the 17th 77.0 on the 13th in 1995 66
Ashburton Downs 36.4 on the 17th 33.0 on the 29th in 1973 64
Tangadee 127.6 on the 17th 63.5 on the 1st in 1967 48
Yinnetharra 60.0 on the 18th 41.9 on the 4th in 1967 48
Bulga Downs 40.4 on the 19th 39.1 on the 28th in 1925 35



Record highest total December rainfall
Total rainfall
for December 2010 (mm)
Previous highest
for December
Years of
record
Average for
December
Murgoo 98.4 76.4 in 1998 121 9.9
Boolardy 139.6 80.2 in 1932 120 8.9
Gabyon 105.4 84.0 in 1983 120 9.3
Doorawarrah 259.8 148.0 in 1995 113 7.7
Denham 116.3 35.8 in 1932 111 2.3
Mount Narryer 250.4 75.9 in 1932 111 7.1
Mullewa 111.4 64.4 in 1983 110 8.5
Burnerbinmah 85.2 50.3 in 1914 109 10.9
Tamala 71.0 26.2 in 1932 109 1.8
Mileura 177.2 122.2 in 1932 108 10.9
Milly Milly 171.0 86.1 in 1932 107 8.2
Mumby 41.0 37.7 in 1921 107 4.4
Ogilvie 54.6 47.2 in 1919 101 6.2
Yuna 70.1 49.4 in 1988 101 7.1
Marron 278.8 89.6 in 1995 98 7.0
Winderie 208.0 89.5 in 1932 98 6.6
Twin Peaks 163.0 122.4 in 1983 97 10.1
Cardabia 40.0 37.8 in 1928 89 2.1
Bulga Downs 88.4 68.8 in 1938 87 12.8
Winning 81.0 76.9 in 1908 84 7.1
Yaringa Station 293.4 101.1 in 1932 84 6.6
Ajana 84.3 42.0 in 2007 83 5.9
Ashburton Downs 63.8 50.3 in 1973 78 10.4
Eudamullah 223.2 54.4 in 1936 78 8.1
Carey Downs 255.0 76.1 in 1932 77 9.6
Willigulli North 32.8 22.1 in 1967 77 3.2
Carnarvon Airport 255.0 77.0 in 1995 66 5.6
Meekatharra Airport 111.4 91.4 in 1998 66 13.6
Wandana 83.0 66.1 in 1983 51 9.8
Yinnetharra 115.0 43.7 in 1967 49 9.4
Tangadee 171.4 85.2 in 1975 48 21.1
Kalbarri 46.0 30.4 in 2007 41 4.0



Record highest December temperature
Highest temperature
in December 2010 (°C)
Previous highest
for December
Years of
record
Average for
December
Eneabba 45.9 on the 27th 45.8 on the 18th in 1987 36 33.3



Record lowest December daily maximum temperature
Lowest daily maximum
temperature
in December 2010 (°C)
Previous lowest
for December
Years of
record
Average for
December
Meekatharra Airport 20.9 on the 17th 21.3 on the 11th in 2007 61 36.4



Record highest December daily minimum temperature
Highest daily minimum
temperature
in December 2010 (°C)
Previous highest
for December
Years of
record
Average for
December
Giles Meteorological Office 31.4 on the 31st 31.0 on the 26th in 1990 55 21.9



Record highest December mean daily minimum temperature
Mean daily minimum
temperature
for December 2010 (°C)
Previous highest
for December
Years of
record
Average for
December
Learmonth Airport 23.0 22.2 in 1998 35 20.7



Summary statistics for December 2010
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2010
Diff
from
average
Highest for
December
2010
Mean for
December
2010
Diff
from
average
Lowest for
December
2010
Total for
December
2010
Average
for
December
Rank of
December
2010
Fraction of
December
average
North Kimberley (district 01)
Doongan 33.7 -0.8 39.2 8th 22.3 -0.8 19.5 2nd 294.0 219.2 high 134%
Kalumburu 33.8 -1.6 37.7 8th 24.3 -0.7 21.6 2nd 318.6 238.8 average 133%
Mount Elizabeth 33.4 -0.7 37.5 9th         205.6 167.2 high 123%
Troughton Island 32.2 -0.7 33.7 9th 26.6 -0.7 22.7 27th 372.2 122.0 high 305%
Truscott 32.8   35.6 8th 25.2   22.1 2nd 234.8
Wyndham 37.0 -1.2 41.8 7th 26.4 -0.6 23.0 2nd 201.2 150.2 high 134%
Wyndham Aero 37.2 -0.7 42.6 7th 26.1 -0.7 22.0 26th 194.0 130.9 high 148%
East Kimberley (district 02)
Argyle Aerodrome 36.9 -0.3 41.2 7th 25.5 -0.4 20.0 2nd 90.4 138.2 average 65%
Halls Creek Airport 37.1 -0.8 41.4 8th 24.9 +0.2 19.6 1st 84.4 81.1 average 104%
Kununurra Aero 36.3 -0.8 40.6 6th 24.6 -0.9 20.8 2nd 196.4 137.2 high 128%
Warmun 37.0 -1.5 42.1 7th 24.5 -0.7 18.6 2nd 144.1 114.3 average 126%
West Kimberley (district 03)
Bidyadanga 34.4 -0.5 41.6 24th         77.2 54.8 high 141%
Broome Airport 33.6 -0.2 39.3 24th 27.3 +0.9 22.8 29th 85.8 56.8 high 150%
Curtin Aero 38.0 -0.3 42.2 9th 24.5 -0.6 21.6 28th 137.4 151.1 average 91%
Cygnet Bay 34.3 -0.5 36.5 10th 25.3 -0.2 22.7 6th 105.7 77.2 average 137%
Derby Aero 36.4 -0.7 40.0 23rd 25.8 -0.5 22.4 28th 86.4 71.0 high 122%
Fitzroy Crossing Aero 39.1 +0.1 43.5 9th 24.9 -0.9 20.9 1st 114.2 123.7 average 92%
West Roebuck 35.3 -0.5 41.3 24th 25.7 +0.5 22.8 1st 67.0 111.7 low 60%
De Grey (district 04)
Karratha Aero 34.9 -0.9 41.7 24th 26.1 +0.7 23.8 17th 41.0 13.0 v high 315%
Mandora 35.3 -1.5 43.0 10th         28.4 34.1 high 83%
Marble Bar 41.7 +0.1 46.7 27th 26.4 +0.4 23.2 1st 15.2 30.2 average 50%
Pardoo Station 36.3 +0.1 40.5 26th         36.4 23.9 high 152%
Port Hedland Airport 35.5 -1.2 40.5 24th 25.3 +1.3 22.6 3rd 10.2 18.4 high 55%
Roebourne 38.3 -0.7 45.2 26th 25.0 +0.1 21.8 4th 30.6 11.1 high 276%
Roebourne Aero 37.9   44.5 26th 25.5   21.5 1st 25.8 6.2 high 416%
Fortescue (district 05)
Barrow Island Airport 32.7 +0.8 38.7 25th 25.1 +0.9 23.1 4th 37.0 3.3 v high 1121%
Learmonth Airport 36.1 -0.7 42.9 25th 23.0 +2.3 19.1 3rd 69.4 6.6 v high 1058%
Mardie 35.6 -2.0 44.6 25th 24.7 +1.8 21.2 4th 30.4 8.4 v high 362%
Onslow 33.0 -2.2 41.8 9th 24.8 +3.2 20.2 4th 29.9 5.3 v high 564%
Onslow Airport 34.0 -1.9 41.9 9th 24.4 +2.3 20.4 4th 34.0 3.6 v high 944%
Tom Price 37.8 0.0 45.0 28th 22.1 +0.4 14.0 1st 44.2 40.7 average 109%
Wittenoom 39.0 -0.6 44.2 27th 25.3 -0.1 19.5 1st 92.0 50.2 high 183%
West Gascoyne (district 06)
Carnarvon Airport 30.5 +1.2 44.2 11th 22.3 +1.7 18.3 5th 255.0 5.6 highest 4554%
Denham 29.5 +0.5 41.7 11th 22.0 +1.7 17.9 5th 116.3 2.3 highest 5057%
Emu Creek Station 39.1 -0.7 46.4 28th 24.1 +1.8 19.3 4th 75.2 13.4 v high 561%
Gascoyne Junction 38.0 -0.7 47.6 27th 23.5 +2.2 18.1 3rd
Shark Bay Airport 32.3 +0.3 45.6 26th 20.7 +1.4 16.6 4th 142.6 13.9 v high 1026%
East Gascoyne (district 07)
Newman Aero 39.2 +0.3 44.5 31st 24.7 +1.1 19.9 17th 45.8 37.6 high 122%
Paraburdoo Aero 40.4 +0.2 46.5 28th 25.3 +1.0 18.6 1st 17.0 29.2 average 58%
Murchison (district 07A)
Meekatharra Airport 35.6 -0.8 44.9 31st 21.7 -0.3 16.0 5th 111.4 13.6 highest 818%
Mount Magnet Aero 34.3 -1.3 45.4 31st 21.3 +0.3 14.0 3rd 109.4 21.7 v high 504%
North Coast (district 08)
Dalwallinu 32.6 -0.5 43.2 27th 16.8 +1.3 8.5 5th 37.0 14.2 high 261%
Dalwallinu Comparison 32.7 -0.2 43.2 27th 17.3 +1.3 10.1 4th 36.6 11.4 v high 321%
Geraldton Airport 30.4 +0.9 45.5 26th 17.8 +1.5 11.2 10th 12.0 5.5 high 233%
Kalbarri 32.0 +1.0 42.8 26th 19.1 +1.8 12.0 5th 46.0 4.0 highest 1150%
Morawa Airport 34.7 -0.5 45.3 27th 18.4 +1.3 10.9 4th 55.6 13.8 v high 403%
Mullewa 34.3 -0.1 44.2 27th 18.9 +2.0 12.5 6th 111.4 8.5 highest 1311%
North Island 27.1 +1.0 30.5 26th 20.9 +1.3 17.7 7th 38.4 4.5 v high 853%
Wongan Hills 32.5 +0.1 43.5 27th 16.1 +0.4 9.5 4th 7.0 10.2 average 69%
Central Coast (district 09)
Bickley 28.7 +0.8 38.8 27th 13.8 +0.4 8.4 4th 18.2 12.5 high 146%
Champion Lakes 30.0   39.9 25th 16.6   9.5 4th 8.2
Garden Island HSF 26.6   36.9 26th 17.3   13.5 10th 11.4 6.8 high 168%
Gingin Aero 30.8 +0.4 41.5 27th 15.2 +1.1 4.6 4th 18.0 7.3 high 247%
Gosnells City 31.7 +1.5 41.5 26th         11.0 10.6 average 104%
Jandakot Aero 30.1 +1.3 41.0 27th 15.2 +0.7 5.5 4th 10.8 9.7 average 111%
Jurien Bay 29.2 +1.2 43.0 26th 16.6 +1.1 11.9 4th 14.7 6.6 high 223%
Karnet 28.6 +0.4 38.0 27th 13.3 -0.1 5.5 4th 9.4 17.1 average 55%
Lancelin 28.5 +1.3 41.0 27th 17.3 +1.2 12.0 3rd 5.0 7.3 average 68%
Medina Research Centre 29.7 +1.8 40.5 27th 16.0 +1.1 7.5 4th 9.5 9.1 average 104%
Pearce RAAF 31.2 +1.0 42.1 27th 15.6 +1.2 5.7 4th 15.6 9.0 high 169%
Perth Airport 30.5 +1.6 40.7 27th 15.8 +1.0 5.8 4th 16.0 10.4 high 152%
Perth Metro* 29.3 +0.5 40.0 27th 16.6 +0.4 9.4 4th 17.4 12.8 high 136%
Rottnest Island 25.3 +0.4 35.5 26th 17.5 0.0 13.8 3rd 46.2 6.8 v high 679%
Swanbourne 28.7 +1.0 39.3 27th 16.5 +0.2 10.3 4th 21.6 7.7 high 281%
South Coast (district 09A)
Albany 20.3 -1.6 25.0 24th 15.6 +1.7 10.2 3rd 32.0 29.5 high 116%
Albany Airport 21.3 -1.8 29.3 24th 13.6 +1.2 7.8 2nd 30.0 26.7 average 112%
Bridgetown 27.3 +0.1 37.6 24th 12.0 +1.3 3.1 10th 16.8 16.5 average 102%
Bridgetown Comparison 27.3 -0.2 36.7 24th 12.5 +1.9 4.2 10th 19.6 18.8 average 104%
Bunbury 28.5 +1.4 37.1 25th 14.0 +0.7 7.2 4th 7.0 15.2 average 46%
Busselton 28.0 +0.9 36.8 24th 13.9 +0.8 7.1 9th 6.2 9.6 average 65%
Busselton Aero 28.3 +0.6 36.0 25th 12.9 +0.7 6.0 2nd 6.2 8.9 average 70%
Cape Leeuwin 21.9 +0.1 26.5 23rd 16.5 +0.8 13.1 4th 32.6 21.1 high 155%
Cape Naturaliste 25.8 +2.3 34.7 25th 14.2 +0.3 9.0 11th 19.0 13.2 high 144%
Collie East 29.0   38.7 24th 12.9   5.2 10th 6.4
Donnybrook 28.7 +0.5 39.3 24th 13.8 +1.5 7.5 4th 5.1 15.9 low 32%
Dwellingup 28.9 +1.7 38.2 27th 13.4 +0.9 6.6 4th 8.8 19.3 average 46%
Esperance 23.9 -0.6 32.8 13th 14.9 +0.6 11.2 12th 18.2 17.9 average 102%
Esperance Aero 24.8 -0.7 34.6 13th 13.5 +0.2 9.7 16th 13.0 19.3 average 67%
Harvey 29.7 +1.5 37.8 27th 13.9 +0.9 7.2 3rd 8.6 12.0 average 72%
Hopetoun North 22.6 -1.7 32.2 24th 14.7 +0.8 11.5 4th 21.8 22.3 average 98%
Jarrahwood 27.8 +1.0 37.0 24th 11.9 +0.9 3.2 10th 16.6 16.7 average 99%
Mandurah 28.0   40.1 25th 17.1   12.1 4th 9.8 6.6 high 148%
Manjimup 24.8 0.0 34.0 24th 12.6 +1.0 8.4 11th 32.6 25.3 high 129%
North Walpole 21.7   31.9 23rd 14.2   9.9 3rd 49.2
Pemberton 23.8 0.0 32.3 27th 13.3 +1.4 7.6 2nd 37.8 34.9 average 108%
Rocky Gully 24.2 -1.2 34.9 27th 12.3 +1.4 6.3 2nd 20.2 32.2 average 63%
Shannon 23.1 -1.4 33.2 23rd 12.5 +1.4 6.6 2nd 38.8 29.4 average 132%
Windy Harbour 21.1 -0.8 28.7 27th         30.3 28.4 average 107%
Witchcliffe 24.5 +0.1 32.6 27th 13.6 +1.5 6.7 10th 17.4 14.5 average 120%
North Central (district 10)
Cunderdin Airfield 32.2 -0.5 43.3 27th 15.5 +0.9 6.5 4th 24.8 7.8 high 318%
Merredin 31.9 0.0 42.4 25th 15.8 +0.1 9.8 4th 13.4 13.8 average 97%
Northam 32.1 0.0 42.5 27th 15.6 +0.3 7.6 4th 31.8 9.2 high 346%
York 31.5 -0.5 42.2 27th 14.7 +0.9 5.5 4th 20.5 11.5 high 178%
South Central (district 10A)
Beverley 31.7 -0.4 40.6 27th 15.0 +0.7 7.0 4th 15.4 10.1 high 152%
Brookton 30.0 -1.0 40.0 27th         10.9 10.2 high 107%
Corrigin 30.0 -0.4 39.0 24th 14.4 +0.5 8.4 4th 20.0 12.8 high 156%
Hyden 30.6 -1.2 39.0 24th 13.6 -0.2 6.5 10th 10.2 13.6 average 75%
Jacup 24.5 -1.5 36.7 24th 11.5 +0.1 5.6 11th 21.4 26.4 average 81%
Katanning 27.2 -1.2 37.6 24th 11.8 +0.3 4.8 10th 7.0 19.1 average 37%
Katanning Comparison 26.8 -1.6 37.4 24th 12.3 +0.2 5.0 10th 9.6 16.0 average 60%
Lake Grace 28.3 -1.0 39.5 24th 13.8 +0.5 7.4 10th 1.2 14.7 v low 8%
Lake Grace Comparison 28.1 -1.6 39.0 24th 13.8 +0.4 7.3 10th 1.2 14.3 low 8%
Narembeen 31.3 -0.6 40.2 24th 14.8 +0.4 8.1 4th 8.1 11.9 average 68%
Narrogin 28.3 -0.6 37.1 24th 13.2 +0.9 8.2 10th 10.0 13.0 average 77%
Newdegate Research Station 28.4 -0.8 39.6 24th 12.0 +0.4 3.8 10th 4.2 13.1 low 32%
Ongerup 25.3 -1.9 35.7 24th 12.8 +0.4 5.4 10th 10.4 16.6 average 63%
Pingelly 29.6 -0.3 39.5 27th 13.7 -0.1 8.4 10th 9.4 11.9 average 79%
Wagin 28.4 -0.8 38.1 24th 12.9 0.0 7.0 10th 8.7 11.9 average 73%
Wandering 29.7 -0.6 39.8 27th 12.9 +1.2 5.9 4th 7.4 11.0 average 67%
Eucla (district 11)
Balladonia 29.3 -0.9 40.1 13th 13.7 +0.5 7.7 10th 26.2 18.5 high 142%
Eucla 24.1 -0.7 32.4 23rd 14.6 -0.4 9.1 16th 8.6 18.2 average 47%
Eyre 25.8 +0.5 38.9 13th 15.1 +1.0 6.4 16th 15.7 19.3 average 81%
Forrest 31.6 +0.5 44.4 29th 14.3 -0.6 8.6 10th 4.2 26.9 low 16%
Red Rocks Point 22.6   27.3 13th 15.8   9.5 16th 19.4
South East (district 12)
Bulga Downs 34.9   43.5 25th 20.3   14.0 18th 88.4 12.8 highest 691%
Kalgoorlie-Boulder Airport 31.6 -0.4 43.1 24th 16.6 0.0 11.4 4th 5.6 16.4 average 34%
Laverton Aero 33.9 +0.6 43.6 31st 20.3 +0.8 14.6 18th 33.2 27.8 average 119%
Leinster Aero 34.5 -0.7 43.6 31st 21.2 +0.2 13.2 18th 81.8 28.6 high 286%
Leonora 34.5 -0.8 44.2 25th 20.3 +0.3 15.1 18th 32.8 16.7 high 196%
Leonora Aero 34.5   43.8 28th 20.8   15.2 18th 28.2
Munglinup West 25.3   35.2 24th 12.6   8.8 4th
Norseman Aero 29.7 -1.3 41.9 13th 13.4 -0.3 4.5 10th 22.8 24.2 average 94%
Salmon Gums Res.Stn. 28.1 -0.8 39.5 13th 11.4 -0.8 1.7 10th 11.4 20.0 average 57%
Southern Cross Airfield 31.6 -1.2 42.7 24th 16.1 +1.1 7.4 4th 11.4 12.4 average 92%
Yeelirrie 34.8 -1.4 45.4 31st 20.0 +0.2 14.4 8th 62.0 20.4 v high 304%
North East (district 13)
Giles Meteorological Office 37.0 +1.3 42.1 31st 22.6 +0.7 18.2 28th 26.4 43.8 average 60%
Telfer Aero 40.7 +0.5 44.7 28th 25.9 +0.6 22.8 4th 47.8 48.3 average 99%
Warburton Airfield 37.7 +1.1 45.3 30th 22.5 +1.3 17.7 17th 0.8 31.6 v low 3%
Wiluna 36.7 -0.1 45.4 31st 21.5 +0.5 15.5 17th 56.6 21.6 high 262%

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 3 pm on Tuesday 4 January 2011. 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.

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.

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