Western Australia in January 2011: Wet month and record hot nights

  • Rainfall: Above average for WA; 6th wettest January in southwest WA.
  • Maximum temperature: Near average for WA; above average in southwest WA.
  • Minimum temperature: Hottest on record for WA

Rainfall

Rainfall during January 2011 was above average for much of WA, apart from localised areas in the southern Kimberley and in the Interior (see January 2011 rainfall totals & deciles). Very much above average monthly totals were observed in parts of western and northern WA; with areas of highest on record in the north Kimberley, Pilbara, inland Gascoyne, Southwest, and Great Southern. When averaged across the state, rainfall during January 2011 was very much above average and ranked as the 13th wettest January since comparable records commenced in 1900; while the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed its 6th wettest January on record.

An active monsoon season in the north of the state, as a result of a strong La Nina and aided by record warm waters off the WA north coast, resulted in a few sites in the Kimberley breaking their highest January rainfall records, while Anna Plains also broke its highest January daily rainfall record at the beginning of the month in heavy thunderstorms. Kuri Bay in the Kimberley recorded 1438.2 mm during January 2011, which is the highest monthly rainfall total ever recorded in WA, breaking the previous record of 1321.7 mm set at Roebuck Plains in the Kimberley in January 1917. In addition to the wettest month on record, Kuri Bay also observed WA's 5th highest two-day rainfall total, with 617.4 mm on the 10th and 11th (228.8 mm and 388.6 mm respectively); and WA's 9th highest three-day rainfall total with 675.4 mm on the 10th, 11th and 12th (228.8 mm, 388.6 mm and 58.0 mm respectively). The monthly total at Kuri Bay was probably higher than observed given that the rainfall gauge overflowed before the observer was able to check the total on the very heavy rainfall day of the 11th, when 388.6 mm was recorded.

Tropical Cyclone Bianca brought heavy rainfall to the Pilbara coast late in January and Mardie recorded a daily fall of 191.0 mm on the 28th, its third highest January daily rainfall. This contributed substantially to a monthly total of 248.6 mm that was a January record for Mardie from observations that commenced in 1886. Frequent storms also brought record monthly rainfall totals to a few stations in the central Gascoyne.

Above average rainfall in the southwest of the state, mainly due to a cold front interacting with tropical moisture on the 5th and a line of storms on the 29th, resulted in Cape Naturaliste and Jarrahwood in the Southwest district, as well as Woodanilling in the Great Southern observing their highest January monthly rainfall totals, while several other sites observed their highest January rainfall in at least 30 years. Frankland in the South Coastal district broke its highest daily rainfall record with 33.0 mm on the 6th as the cold front crossed the southwest of WA.

Maximum temperature

Monthly mean maximum temperatures were above to very much above average in the west Gascoyne, Southwest Land Division (SWLD) southern Goldfields, Eucla and much of the Interior, with an area of 3 °C to 4 °C above normal in the central Interior, where some sites recorded one of the hottest Januarys on record. In contrast, the northern Gascoyne, Pilbara and Kimberley observed below to very much below average daytime temperatures, with the north Kimberley up to 3 °C below normal (see January 2011 mean maximum temperature decile & anomaly maps) as a result of an active monsoon. When averaged across the state, January 2011 was near average in terms of mean maximum temperature; however, in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) January 2011 was the 12th hottest January on record . Comparable records began in 1950.

Very hot conditions were experienced in the southeast of WA during the last few days of the month, with many sites observing daily maximum temperatures in the mid-to-high 40's. Salmon Gums Research Station in the Southeast Coastal and Giles Meteorological Office in the eastern Interior both broke their highest daily maximum temperature records on the 28th. Forrest in the Eucla recorded 48.4 °C on the 30th, the highest temperature recorded in WA in January 2011, however this was not enough to break the previous Forrest and WA January record of 49.8 °C set on 13 January 1979.

Minimum temperature

Mean minimum temperatures were above to very much above average over much of WA during January 2011, with areas of highest on record in the eastern Interior, western Pilbara and parts of the Gascoyne, with an area of 4 to 5 °C above normal in the eastern Interior. Numerous sites scattered through WA recorded their highest January mean minimum temperature on record. In contrast, the north and west Kimberley was below to very much below average due to the active monsoon and above average rainfall. (see December minimum temperature decile & anomaly maps). When averaged across the state, January 2011 was the hottest January since comparable records began in 1950, and in fact the last four years in WA have seen the four hottest Januarys on record. The Lower Southwest recorded its 3rd hottest January on record in January 2011.

A very hot night was experienced at Eucla on the 30th with a minimum of 30.7 °C, breaking the previous hottest night on record of 30.2 °C set on 26 February 2009 (the previous January record was 28.0 °C on 24 January 2003). This extreme minimum came after Eucla recorded its highest maximum for the month of 47.1 °C on the 29th, not far below Eucla's record of 47.9 °C on 3 January 1979.

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Extremes in January 2011
Hottest day 48.4 °C at Forrest on the 30th
Warmest days on average 41.4 °C at Warburton Airfield
Coolest days on average 23.6 °C at Albany
Coldest day 17.0 °C at Narrogin on the 24th
Coldest night 6.2 °C at Eyre on the 22nd
Coolest nights on average 13.6 °C at Rocky Gully
Warmest nights on average 27.6 °C at Karratha Aero
27.6 °C at Legendre Island
27.6 °C at Onslow
Warmest night 31.9 °C at Telfer Aero on the 31st
Wettest overall 1438.2 mm at Kuri Bay
Wettest day 388.6 mm at Kuri Bay on the 11th
Highest wind gust 128 km/h at Kalgoorlie-Boulder Airport on the 28th
128 km/h at Norseman Aero on the 30th

Record highest January daily rainfall
Highest daily rainfall
in January 2011 (mm)
Previous highest
for January
Years of
record
Nangeenan 70.0 on the 6th 65.0 on the 29th in 1990 107
Anna Plains 173.8 on the 3rd 163.4 on the 19th in 1982 68
Frankland 33.0 on the 6th 27.2 on the 1st in 1951 34



Record highest total January rainfall
Total rainfall
for January 2011 (mm)
Previous highest
for January
Years of
record
Average for
January
Mardie 248.6 241.1 in 1961 124 37.5
Mount Narryer 133.3 129.8 in 1902 112 15.6
Cape Naturaliste 58.6 58.5 in 1960 107 10.7
Woodanilling 92.9 66.8 in 2006 75 11.7
Mooloo Downs 136.9 114.0 in 1990 50 19.9
Theda 792.4 587.1 in 1984 44 304.4
Kuri Bay 1438.2 1144.9 in 1974 41 407.4
Jarrahwood 86.2 84.2 in 1976 36 14.4




Record highest January temperature
Highest temperature
in January 2011 (°C)
Previous highest
for January
Years of
record
Average for
January
Salmon Gums Res.Stn. 46.3 on the 28th 45.7 on the 6th in 2010 72 30.5
Giles Meteorological Office 44.8 on the 28th 44.5 on the 2nd in 1973 55 37.3



Record highest January daily minimum temperature
Highest daily minimum
temperature
in January 2011 (°C)
Previous highest
for January
Years of
record
Average for
January
Eucla 30.7 on the 30th 28.0 on the 24th in 2003 48 16.5



Record highest January mean daily minimum temperature
Mean daily minimum
temperature
for January 2011 (°C)
Previous highest
for January
Years of
record
Average for
January
Balladonia 17.4 17.1 in 1999 86 14.6
Carnarvon Airport 24.9 24.3 in 1974 64 22.4
Giles Meteorological Office 26.6 25.4 in 1979 54 23.5
Merredin 19.3 19.2 in 1978 45 17.7
Lancelin 19.2 19.0 in 1980 44 17.5
Onslow Airport 27.1 26.4 in 2003 44 24.2
Emu Creek Station 26.4 26.2 in 2009 38 24.4
Hyden 17.3 17.0 in 2001 36 15.4
Warburton Airfield 26.7 25.9 in 1979 36 22.7
Kalbarri 22.9 21.6 in 1981 35 19.3
Learmonth Airport 25.8 24.8 in 1997 35 22.9



Summary statistics for January 2011
Maximum temperatures
for January
(°C)
Minimum temperatures
for January
(°C)
Rainfall
for January
(millimetres)
Mean for
January
2011
Diff
from
average
Highest for
January
2011
Mean for
January
2011
Diff
from
average
Lowest for
January
2011
Total for
January
2011
Average
for
January
Rank of
January
2011
Fraction of
January
average
North Kimberley (district 01)
Doongan 31.2 -2.1 35.2 30th 22.3 -0.5 19.8 28th 660.0 303.3 v high 218%
Kalumburu 31.3 -2.7 35.5 27th 23.9 -0.8 21.2 23rd 683.0 303.3 v high 225%
Kuri Bay 31.5 -1.3 36.0 16th         1438.2 407.4 highest 353%
Mount Elizabeth 31.3 -1.8 33.7 6th       445.2 255.7 v high 174%
Truscott 30.1   33.0 30th 24.1   21.5 31st 787.2
Wyndham 34.6 -2.3 38.8 7th 25.5 -0.9 21.4 28th 316.7 186.8 v high 170%
Wyndham Aero 34.4 -2.1 39.2 7th 25.5 -0.8 21.1 28th 258.4 195.6 high 132%
East Kimberley (district 02)
Argyle Aerodrome 35.1 -1.4 39.1 30th 24.9 -0.8 22.2 28th 208.0 156.7 high 133%
Halls Creek Airport 36.3 -0.5 39.3 30th 24.2 -0.1 19.6 28th 82.0 152.3 low 54%
Kununurra Aero 33.5 -2.4 37.7 30th 24.3 -0.8 21.9 28th 249.4 199.8 high 125%
Warmun 35.8 -1.5 39.4 5th 24.5 -0.3 22.1 18th 204.5 179.9 average 114%
West Kimberley (district 03)
Bidyadanga 33.7 -0.7 37.0 30th         200.5 124.9 high 161%
Broome Airport 32.2 -1.1 35.2 29th 25.1 -1.2 21.6 28th 449.2 178.5 v high 252%
Curtin Aero 34.1 -2.5 37.7 30th 24.2 -0.9 21.6 12th 420.4 215.8 v high 195%
Cygnet Bay 31.9 -2.0 34.6 31st 24.5 -1.1 21.5 8th 596.5 228.1 v high 262%
Derby Aero 33.0 -2.3 36.6 5th 25.0 -0.7 21.6 12th 412.6 196.3 v high 210%
West Roebuck 32.9   36.6 8th 24.4   21.5 18th 460.8 204.7 high 225%
De Grey (district 04)
Bedout Island 33.5   35.0 30th 27.3   22.0 21st
Karratha Aero 35.5 -0.6 39.4 11th 27.6 +0.8 23.7 28th 201.2 44.9 v high 448%
Legendre Island 33.6   36.3 25th 27.6   23.6 28th 0
Mandora 35.4 -0.6 42.0 11th 26.2 +0.8 22.0 21st 134.7 81.0 high 166%
Pardoo Station 36.4 -0.1 42.5 11th     20.0 21st 136.8 59.7 high 229%
Port Hedland Airport 35.8 -0.6 42.0 11th 26.9 +1.4 22.5 14th 159.4 59.3 v high 269%
Roebourne 37.6 -1.1 42.4 25th 27.1 +0.9 24.8 8th 166.2 59.9 high 277%
Roebourne Aero 37.1   41.9 25th 27.3   23.3 28th 186.2 58.1 high 320%
Fortescue (district 05)
Learmonth Airport 36.6 -1.4 41.9 15th 25.8 +2.9 23.1 15th 102.2 30.8 v high 332%
Mardie 36.9 -1.1 43.5 20th 27.3 +2.4 23.2 28th 248.6 37.5 highest 663%
Onslow 36.1 +0.4 42.0 31st 27.6 +3.9 24.2 9th 64.4 27.9 high 231%
Onslow Airport 36.6 +0.2 42.2 25th 27.1 +2.9 23.3 9th 84.8 40.1 high 211%
Wittenoom 38.2 -1.4 42.5 25th 25.9 -0.2 19.7 29th 79.9 102.7 average 78%
West Gascoyne (district 06)
Carnarvon Airport 33.4 +2.2 40.8 10th 24.9 +2.5 21.9 15th 63.8 12.0 v high 532%
Denham 32.7 +2.4 40.0 10th 25.2 +3.5 21.9 15th 65.6 7.6 v high 863%
Emu Creek Station 39.3 -2.0 44.7 1st 26.4 +2.0 23.7 28th 108.8 45.2 high 241%
Gascoyne Junction 39.5 -1.3 47.6 1st 26.4 +2.7 22.6 5th
Shark Bay Airport 35.3 +2.0 43.1 1st 23.9 +2.9 20.5 15th 76.4 9.1 v high 840%
East Gascoyne (district 07)
Newman Aero 39.9 +0.4 44.5 18th 25.9 +0.9 19.2 29th 59.0 57.3 high 103%
Paraburdoo Aero 38.9 -2.3 41.9 31st 25.5 -0.5 19.7 29th 205.0 47.7 v high 430%
Murchison (district 07A)
Meekatharra Airport 38.7 +0.4 43.4 1st 25.9 +1.5 21.5 31st 26.2 27.1 average 97%
Mount Magnet Aero 37.7 -0.3 44.0 1st 25.2 +1.9 19.5 8th 26.8 25.8 average 104%
North Coast (district 08)
Carnamah 37.2 +1.2 44.6 27th 21.2 +2.8 14.5 15th 11.8 11.8 high 100%
Dalwallinu 35.7 +0.4 42.9 2nd 19.8 +2.0 14.1 8th 26.8 21.6 average 124%
Dalwallinu Comparison 35.8 +0.6 42.7 2nd 20.5 +2.2 14.9 7th 27.7 14.8 high 187%
Geraldton Airport 33.8 +2.2 41.0 9th 20.5 +2.2 13.6 15th 15.0 5.7 high 263%
Kalbarri 35.1 +2.0 42.0 10th 22.9 +3.6 17.5 8th 17.2 4.4 v high 391%
Morawa Airport 37.6 +0.5 44.8 27th 22.2 +2.8 15.7 15th 39.0 25.1 average 155%
Mullewa 37.0 +0.2 44.0 1st 22.7 +3.4 16.6 15th 27.2 13.1 high 208%
North Island 29.5 +2.7 35.0 28th 23.3 +2.5 21.5 7th 6.8 2.5 high 272%
Wongan Hills 36.3 +1.8 42.5 28th 19.9 +2.2 14.5 25th 19.8 13.7 high 145%
Central Coast (district 09)
Badgingarra Research Stn 35.8 +1.1 42.9 27th 19.0 +2.1 12.3 7th 10.8 8.9 high 121%
Bickley 31.5 +0.9 38.1 28th 16.8 +1.7 11.3 25th 36.6 17.2 high 213%
Champion Lakes 32.5   39.5 29th 20.0   13.6 25th 35.2
Garden Island HSF 28.8   37.5 10th 19.9   15.6 25th 20.6 10.3 high 200%
Gingin Aero 34.7 +1.8 41.2 29th 18.0 +1.9 10.3 25th 15.2 16.0 average 95%
Gosnells City 34.1 +1.1 42.0 29th 19.9 +1.6 12.5 25th 29.6 11.9 high 249%
Jandakot Aero 32.9 +1.8 40.6 29th 18.0 +1.5 10.3 25th 31.4 14.6 high 215%
Jurien Bay 31.8 +2.0 40.4 10th 18.7 +1.6 14.2 8th 22.0 7.0 v high 314%
Karnet 31.0 +0.3 38.0 2nd 16.7 +1.5 9.5 25th 38.2 17.0 high 225%
Lancelin 31.6 +2.7 40.0 11th 19.2 +1.7 14.0 25th 12.0 8.9 high 135%
Medina Research Centre 32.1 +1.7 39.4 28th 18.8 +2.1 12.4 25th 21.6 11.4 high 189%
Pearce RAAF 34.8 +1.4 41.8 28th 18.8 +1.9 11.5 26th 10.8 7.9 high 137%
Perth Airport 33.7 +2.1 41.8 29th 19.0 +2.1 11.2 25th 42.6 9.4 v high 453%
Perth Metro 32.5 +1.6 40.4 29th 19.5 +1.6 13.1 25th 30.2 9.5 v high 318%
Rottnest Island 27.7 +1.5 34.5 12th 20.1 +1.2 16.4 25th 33.8 13.4 high 252%
Swanbourne 31.5 +2.1 38.8 2nd 19.3 +1.4 13.2 25th 16.6 16.9 high 98%
South Coast (district 09A)
Albany 23.6 +0.8 37.9 5th 17.3 +2.2 13.1 25th 82.3 24.0 v high 343%
Albany Airport 25.3 +0.6 38.9 5th 14.9 +1.3 7.8 21st 72.8 24.0 v high 303%
Bridgetown 30.5 +0.9 38.4 28th 14.6 +1.8 8.1 15th 100.6 16.1 v high 625%
Bridgetown Comparison 31.3 +1.5 38.3 28th 15.1 +2.9 8.5 15th 92.6 14.4 v high 643%
Bunbury 30.4 +0.9 37.7 2nd 16.7 +1.6 8.8 15th 64.4 13.0 v high 495%
Busselton 29.5 +0.2 36.2 2nd 16.0 +1.3 11.7 8th 80.6 14.6 v high 552%
Busselton Aero 30.7 +0.8 36.9 2nd 15.6 +1.6 10.8 15th 75.6 13.5 v high 560%
Cape Leeuwin 24.0 +1.0 29.9 4th 18.0 +1.1 13.7 24th 73.8 16.5 v high 447%
Cape Naturaliste 26.9 +1.6 33.3 10th 16.6 +1.4 12.9 8th 58.6 10.7 highest 548%
Collie East 31.9   38.7 28th 15.0   7.6 15th 71.8
Donnybrook 32.1 +1.6 39.8 28th 16.5 +2.6 10.2 15th 77.6 12.2 v high 636%
Dwellingup 31.3 +1.7 38.1 29th 15.9 +1.7 9.6 15th 62.6 15.8 v high 396%
Esperance 27.4 +1.3 42.6 22nd 16.8 +1.2 11.5 17th 35.4 27.7 high 128%
Esperance Aero 28.8 +1.3 44.6 28th 15.6 +0.9 11.9 15th 35.2 27.3 high 129%
Harvey 31.8 +0.9 39.0 28th 16.3 +1.1 11.2 15th 64.6 12.9 v high 501%
Hopetoun North 26.4 +1.1 41.7 22nd 15.8 +0.6 10.1 12th 53.8 46.3 average 116%
Jarrahwood 31.0 +1.7 37.0 4th 14.2 +1.8 8.0 15th 86.2 14.4 highest 599%
Mandurah 29.7   38.4 2nd 20.0   15.1 25th 38.8 13.7 high 283%
Manjimup 28.9 +1.8 36.4 4th 14.1 +1.1 10.4 8th 84.4 19.7 v high 428%
North Walpole 25.1   35.1 13th 15.0   10.3 21st 107.6
Pemberton 28.0 +1.9 34.6 12th 14.6 +1.5 10.8 8th 65.2 22.1 v high 295%
Rocky Gully 28.5 +1.4 37.4 13th 13.6 +1.1 8.5 21st 80.4 17.5 v high 459%
Shannon 27.3 +0.8 34.3 13th 13.7 +1.2 10.0 15th 63.4 16.5 v high 384%
Windy Harbour 24.3 +1.3 31.7 5th         67.6 16.9 v high 400%
Witchcliffe 26.9 +1.0 33.0 12th 14.7 +1.0 9.9 8th
North Central (district 10)
Cunderdin Airfield 35.9 +1.2 44.2 28th 18.8 +1.9 14.7 7th 24.8 25.1 high 99%
Merredin 35.3 +1.5 43.4 28th 19.3 +1.6 14.8 15th 70.2 14.3 v high 491%
Northam 35.6 +1.4 43.9 28th 18.8 +1.7 13.0 14th 26.2 10.4 high 252%
York 35.0 +0.9 43.0 28th 17.5 +1.3 11.5 14th 28.4 30.6 high 93%
South Central (district 10A)
Beverley 35.2 +1.0 42.4 28th 17.8 +1.6 12.8 15th 36.8 11.9 v high 309%
Brookton 33.8 +0.9 42.4 28th         40.3 12.7 v high 317%
Corrigin 33.8 +1.3 43.6 28th 17.4 +1.6 13.1 15th 30.2 16.4 high 184%
Hyden 35.2 +1.6 45.5 28th 17.3 +1.9 13.9 15th 38.0 19.3 high 197%
Jacup 29.1 +1.8 44.0 28th 14.1 +1.2 7.9 15th 52.8 36.6 high 144%
Katanning 31.1 +1.5 43.5 28th 14.3 +0.9 10.3 25th 98.0 24.7 v high 397%
Katanning Comparison 31.3 +1.1 41.8 28th         92.8 14.2 v high 654%
Lake Grace 32.3 +1.5 44.4 28th 16.3 +1.3 12.7 15th 18.4 43.6 average 42%
Lake Grace Comparison 32.2 +0.7 44.0 28th 16.3 +1.3 12.6 16th 15.4 18.3 high 84%
Narembeen 35.5 +1.5 43.9 28th 18.0 +1.5 14.1 15th 50.0 16.0 v high 313%
Narrogin 31.7 +0.7 42.0 28th 15.9 +1.8 11.8 25th 60.0 12.8 v high 469%
Newdegate Research Station 32.5 +1.8 45.1 28th 15.0 +1.3 8.3 15th 24.6 19.2 high 128%
Ongerup 29.3 +0.8 41.6 28th 14.7 +0.9 10.4 15th 51.6 18.8 high 274%
Pingelly 33.2 +1.4 42.1 28th 16.5 +1.1 11.9 15th 38.2 10.9 v high 350%
Wagin 31.9 +0.9 42.2 28th 15.2 +0.8 10.6 15th 100.0 12.7 v high 787%
Wandering 33.0 +1.1 42.4 28th 15.3 +1.5 8.1 15th 38.8 17.6 high 220%
Eucla (district 11)
Balgair 34.8 +1.9 47.0 30th     12.5 13th 24.4 20.3 high 120%
Balladonia 32.7 +1.4 45.9 29th 17.4 +2.8 11.2 22nd 21.4 18.3 high 117%
Eucla 28.3 +2.5 47.1 29th 17.8 +1.3 13.3 4th 16.2 14.6 high 111%
Eyre 29.7 +3.3 45.9 29th 16.7 +1.5 6.2 22nd 17.6 16.0 high 110%
Forrest 34.6 +1.6 48.4 30th 18.1 +2.1 12.4 13th 11.2 24.2 average 46%
Red Rocks Point 26.4   45.3 29th 18.4   13.7 13th 8.8
South East (district 12)
Bulga Downs 37.8   43.5 23rd 24.3   17.5 8th 20.0 27.8 average 72%
Kalgoorlie-Boulder Airport 34.5 +0.8 44.9 28th 19.9 +1.7 14.4 11th 49.2 23.7 high 208%
Laverton Aero 36.4 +0.9 45.8 28th 22.7 +1.3 15.9 11th 31.6 39.6 average 80%
Leinster Aero 37.9 +0.5 43.6 23rd 24.8 +1.6 19.4 8th 27.6 35.2 average 78%
Leonora 37.0 -0.1 46.2 28th 23.2 +1.5 16.9 11th 38.2 24.0 high 159%
Leonora Aero 36.9   45.9 28th 23.4   17.2 11th 36.4
Munglinup West 29.5   45.3 28th 15.1   11.1 15th 50.8
Norseman 33.8 +1.3 45.0 28th 17.5 +1.7 12.5 8th 36.2 19.8 high 183%
Norseman Aero 33.8 +1.4 45.6 28th 17.2 +1.6 10.8 8th 47.8 39.4 average 121%
Salmon Gums Res.Stn. 32.3 +1.8 46.3 28th 15.5 +1.6 9.5 8th 38.0 26.7 high 142%
Southern Cross Airfield 35.5 +0.7 44.5 28th 19.4 +2.0 14.7 15th 44.6 31.2 average 143%
Yeelirrie 38.5 +0.5 44.4 23rd 25.0 +2.8 21.0 8th 39.2 28.1 high 140%
North East (district 13)
Balgo Hills 38.2 -0.5 42.3 30th 25.1 -0.1 22.4 13th 83.6 70.5 high 119%
Carnegie 41.0 +2.1 45.8 31st 26.6 +2.8 21.4 7th 36.7 28.6 high 128%
Giles Meteorological Office 40.1 +2.8 44.8 28th 26.6 +3.1 19.6 13th 16.2 29.1 average 56%
Telfer Aero 40.3 -0.3 46.4 31st 26.7 +0.7 22.8 2nd 58.6 46.8 average 125%
Warburton Airfield 41.4 +3.5 46.5 28th 26.7 +4.0 20.2 12th 4.6 27.2 low 17%
Wiluna 39.7 +1.8 44.5 23rd 26.0 +3.2 22.5 10th 14.9 35.2 average 42%

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 1 February 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.

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
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