Western Australia in Summer 2010/11: A very wet summer in WA

  • Rainfall: 2nd highest on record for WA.
  • Maximum temperature: Below average for WA; above average in southwest WA.
  • Minimum temperature: 6th highest on record for WA; highest on record for southwest WA.

Rainfall

Summer 2010/11 rainfall was above to very much above average over most of Western Australia, with many sites in the Kimberley, Pilbara, Gascoyne, northern parts of the Southwest Land Division (SWLD), Goldfields, far southern Interior and Eucla observing their highest summer rainfall totals on record. When averaged across the state, rainfall during summer 2010/11 ranked as the 2nd highest on record, only behind 1999/2000. Comparable records began in 1900. The wet conditions were primarily due to an active monsoon over the north of the state for much of the season, with fairly consistent falls across each of the summer months, as a result of one of the strongest La Ninas on record. Above average rainfall was also observed in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), mainly due to above average rainfall during January 2011.

Kuri Bay in the Kimberley recorded 1540.4 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. Kuri Bay recorded 1848.6 mm during summer 2010/11 which was the highest total in WA.

A number of highest daily rainfall records were broken in the third week of December 2010 in the Gascoyne and adjacent parts of neighbouring districts due to a monsoon low moving affecting the area from the 16th to the 18th, with large parts of the west Gascoyne recording over 150 mm and a few sites recording over 300 mm. This rainfall event led to some of the most significant flooding in the Gascoyne River since recording commenced. For further information about this event, please refer to the December WA Monthly Weather Review.

Tropical Cyclone Bianca brought heavy rainfall to the Pilbara coast late in January 2011. Further heavy rainfall was observed in the Gascoyne and Goldfields on 17 and 18 February as Tropical Cyclone Dianne combined with a cloudband resulting in several sites recording daily falls in excess of 100 mm. TC Carlos, which formed over the Top End of the Northern Territory in mid-February and caused very heavy rainfall in Darwin, tracked across the Kimberley and reformed off the west Kimberley coast and brought heavy rainfall as it moved along the Pilbara coast, passing through Onslow and Exmouth on the 23rd. A tropical low towards the end of February brought further heavy falls to the Kimberley and Pilbara with daily rainfall totals of over 100 mm .

Maximum temperature

Maximum temperatures during summer 2010/11 were above average along the west coast of the SWLD and western Gascoyne, contrasting with below average mean daytime temperatures through the remainder of WA. When averaged across WA as a whole, summer 2010/11 was below average in terms of mean daily maximum temperature mainly due to an active monsoon for much of the period in the north. Mardie in the Pilbara observed its "coolest" summer on record with a mean daily maximum temperature of 35.5 °C, whilst Wyndham in the Kimberley equalled its lowest mean daily maximum temperature. The Lower Southwest, however was above average, and Jurien Bay in the Lower West observed its hottest summer on record.

Very hot conditions were experienced in the southeast of WA during the last few days of January 2011, with many sites observing daily maximum temperatures in the mid-to-high 40s. Forrest in the Eucla recorded 48.4 °C on the 30th, not far below the Forrest and WA January record of 49.8 °C set on 13 January 1979, while Salmon Gums Research Station in the Southeast Coastal broke its highest daily maximum temperature record with 46.3 °C.

Very hot and humid conditions were experienced in western parts of WA in the latter half of February due to persistent hot and humid northeasterly winds, and a reduction in the seabreeze near the coast, as a sequence of tropical cyclones moved westward near the Pilbara coast and decayed off the west coast. Several sites in the Central West and Central Wheat Belt registered three consecutive days with daily maximum temperatures over 40 °C.

Minimum temperature

Mean minimum temperatures during summer 2010/11 were above average in western parts of WA and in the Interior and Eucla. In contrast, much of the Kimberley and eastern Pilbara were below average. When averaged across the state, summer 2010/11 was the 6th hottest in terms of mean minimum temperature, while the Lower Southwest was the hottest since comparable records commenced in 1950, breaking the record set in 1977/78. A number of sites in the southwest of WA broke their highest summer mean daily minimum temperature records with consistently warm overnight conditions experienced throughout much of summer, after the first few weeks of December. A few sites in the Gascoyne, coastal Pilbara and other scattered locations in WA also observed their hottest summer in terms of overnight temperatures.

A very hot night was experienced at Eucla on the 30 January 2011 with a minimum of 30.7 °C, breaking the previous hottest night in 52 years of record of 30.2 °C set on 26 February 2009. This extreme minimum came after Eucla recorded its highest maximum for the month of 47.1 °C on the 29 January 2011, not far below Eucla's record of 47.9 °C on 3 January 1979.

Many sites in western and southern WA experienced continuous warm nights (when the daily minimum temperature is 20 °C or above) in the latter part of February 2011, with several sites, including Perth Metro, experiencing a record run of warm nights. Kalbarri's run of warm nights commencing 16 January and spanning February with the 44 consecutive warm nights easily passing the previous record run of 19 consecutive warm nights set in 1985 (7 to 25 February).

Cape Leeuwin in the Southwest district recorded its highest summer mean daily minimum temperature, the hottest summer in 113 years of record. It was also the hottest summer in 50 years at Cape Leeuwin in terms of daily maximum temperature.

Other phenomena

Severe thunderstorms developed in the Central West during 29 January 2011, forming into an organised squall line and tracking towards the south. The storms caused severe localised damage, particularly in the areas of Wongan Hills, Toodyay, Grass Valley, Goomalling, Northam, Spencers Brook, Clackline, Muresk, York and Beverley.

Severe thunderstorms produced flash flooding in the community of Warburton (Interior) on 10 February and in Nungarin (Central Wheat Belt) on 11 February.

Notable events

  • A monsoon low caused very heavy rainfall in the Gascoyne from 16 to 18 December 2010, resulting in significant flooding in the Gascoyne River and around the town of Carnarvon.
  • Kuri Bay in the west Kimberley observed 1540.4 mm of rainfall during January 2011, which is the wettest month on record for WA.
  • January 2011 was the hottest January on record for WA in terms of overnight temperature.
  • February 2011 was the 2nd wettest February and 2nd coolest February (in terms of maximum temperature) on record in WA. The Lower Southwest, however, experienced its 2nd hottest February in terms of minimum temperature.
  • Four tropical cyclones formed off the northwest of WA during summer 2010/11, with three of these, Tropical Cyclone Bianca; Tropical Cyclone Dianne; and Tropical Cyclone Carlos, having an affect on the WA coast.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in summer 2010-11
Hottest day 48.4 °C at Forrest on 30 Jan 2011
Warmest days on average 39.2 °C at Telfer Aero
Coolest days on average 22.1 °C at Albany
Coldest day 15.5 °C at Ravensthorpe on 2 Dec 2010
Coldest night 1.7 °C at Salmon Gums Res.Stn. on 10 Dec 2010
Coolest nights on average 13.5 °C at Jacup
Warmest nights on average 27.0 °C at Bedout Island
26.5 °C at Karratha Aerodrome
Warmest night 32.1 °C at Warburton Airfield on 31 Dec 2010
Wettest overall 1848.6 mm at Kuri Bay
Wettest day 288.2 mm at Varanus Island on 23 Feb 2011
Highest wind gust 139 km/h at Varanus Island on 22 Feb 2011
133 km/h at Onslow Airport on 23 Feb 2011

Record highest summer daily rainfall
Highest daily rainfall
in summer 2010-11 (mm)
Previous wettest
for summer
Years of
record
Mount Narryer 140.0 on 18 Dec 2010 129.0 on 21 Feb 2008 109
Lyons River 160.0 on 18 Dec 2010 121.4 on 12 Feb 1961 106
Woolgorong 90.8 on 18 Dec 2010 71.6 on 17 Feb 1970 106
Yundamindra 126.0 on 17 Feb 2011 101.6 on 1 Jan 1955 106
Laverton 120.2 on 17 Feb 2011 92.6 on 24 Jan 2000 104
Callagiddy Station 187.0 on 17 Dec 2010 123.7 on 17 Jan 1923 102
Marron 166.4 on 17 Dec 2010 127.0 on 21 Jan 1967 100
Twin Peaks 163.0 on 18 Dec 2010 150.0 on 22 Feb 1975 99
Gnaraloo 247.7 on 17 Dec 2010 238.0 on 17 Jan 1923 98
Cooralya 173.5 on 18 Dec 2010 115.4 on 21 Feb 1975 96
Edaggee 176.4 on 17 Dec 2010 118.6 on 17 Jan 1923 94
Yaringa Station 179.0 on 17 Dec 2010 150.0 on 17 Feb 2004 86
Doolgunna 92.0 on 17 Feb 2011 90.7 on 26 Jan 1961 83
Willigulli North 77.0 on 21 Feb 2011 76.2 on 26 Feb 1915 83
Hamelin Station 87.0 on 3 Jan 2011 46.0 on 21 Jan 1982 71
Carnarvon Airport 207.8 on 17 Dec 2010 78.2 on 16 Feb 1970 67
Neds Creek 117.6 on 18 Feb 2011 95.3 on 14 Feb 1961 65
Tangadee 127.6 on 17 Dec 2010 127.0 on 13 Feb 1961 50
Badgingarra Research Stn 64.8 on 9 Feb 2011 53.6 on 21 Feb 1986 49
Frankland 33.0 on 5 Jan 2011 29.2 on 15 Dec 1961 41
Mooloo Downs 86.0 on 11 Feb 2011 83.5 on 28 Jan 2009 31
Useless Loop 63.0 on 17 Dec 2010 58.6 on 21 Feb 1986 30



Record highest total summer rainfall
Total rainfall
for summer 2010-11 (mm)
Previous wettest
for summer
Years of
record
Average for
summer
Gabyon 274.7 220.0 in 1914 120 48.5
Doorawarrah 509.0 314.0 in 1942 112 65.7
Mount Narryer 514.7 248.7 in 1944 111 49.1
Denham 271.9 247.7 in 1907 110 25.7
Mullewa 304.5 205.4 in 1993 110 39.8
Tamala 128.0 127.0 in 1920 108 16.1
Nungarin 206.2 180.1 in 1942 106 45.3
Milly Milly 583.8 250.6 in 2005 105 68.1
Nabawa 163.4 150.1 in 1914 105 25.6
Barnong 263.6 243.2 in 1914 103 47.2
Minnie Creek 300.5 290.0 in 1917 100 79.8
Yuna 182.1 155.7 in 1914 100 32.1
Marron 508.6 240.1 in 1966 97 47.1
Winderie 459.0 381.0 in 1922 95 68.7
Myroodah 723.2 720.9 in 1981 92 368.1
Canna 205.4 164.6 in 1969 91 45.0
Yuin 291.2 192.2 in 2005 90 46.6
Gibb River 985.4 864.8 in 1941 86 504.6
Mia Mia 363.6 359.1 in 1998 84 90.2
Yaringa Station 382.2 246.5 in 2003 83 35.0
Cape Leveque 1203.8 1194.7 in 1973 82 497.9
Doolgunna 341.5 325.3 in 1962 81 90.6
Ajana 195.0 118.3 in 1962 79 27.9
Carey Downs 548.9 320.9 in 1962 74 60.9
Willigulli North 163.8 138.0 in 1914 73 21.2
Eradu 177.8 135.1 in 1915 67 30.1
Carnarvon Airport 409.2 224.7 in 1962 66 38.7
Meekatharra Airport 307.6 288.0 in 1959 66 78.0
Coolangatta 167.6 165.6 in 1962 57 34.5
Wandana 213.0 160.5 in 2007 51 48.9
Cygnet Bay 1215.2 1130.0 in 1996 47 493.5
Mooloo Downs 470.5 168.0 in 1993 47 57.0
Rawlinna Homestead 190.0 168.4 in 1994 46 57.8
Tangadee 530.2 401.4 in 1962 46 117.9
Kalbarri 128.9 53.9 in 1985 41 17.1
Theda 1542.2 1485.8 in 1996 40 793.4
Exmouth Town 410.6 294.0 in 1970 38 68.3
Camballin 814.9 810.0 in 2008 34 401.4



Record highest summer temperature
Highest temperature
in summer 2010-11 (°C)
Previous warmest
for summer
Years of
record
Average for
summer
Salmon Gums Res.Stn. 46.3 on 28 Jan 2011 45.7 on 6 Jan 2010 75 29.7



Record highest summer mean daily maximum temperature
Mean daily maximum
temperature
for summer 2010-11 (°C)
Previous warmest
for summer
Years of
record
Average for
summer
Jurien Bay 31.8 31.1 in 2009 41 29.5



Record lowest summer mean daily maximum temperature
Mean daily maximum
temperature
for summer 2010-11 (°C)
Previous coolest
for summer
Years of
record
Average for
summer
Mardie 35.5 35.6 in 1962 54 37.7



Record highest summer daily minimum temperature
Highest daily minimum
temperature
in summer 2010-11 (°C)
Previous warmest
for summer
Years of
record
Average for
summer
Eucla 30.7 on 30 Jan 2011 30.2 on 26 Feb 2009 52 16.2



Record highest summer mean daily minimum temperature
Mean daily minimum
temperature
for summer 2010-11 (°C)
Previous warmest
for summer
Years of
record
Average for
summer
Onslow 26.3 25.4 in 1979 118 23.2
Cape Leeuwin 18.0 17.9 in 1999 113 16.6
Bridgetown Comparison 14.7 14.3 in 1977 109 11.7
Donnybrook 16.3 16.2 in 1977 103 13.5
Albany 17.0 16.3 in 1917 91 14.8
Balladonia 16.0 15.9 in 2003 86 14.2
Geraldton Airport 20.6 20.0 in 1961 68 17.9
Pemberton 14.7 14.1 in 1999 66 12.9
Perth Airport 18.5 18.4 in 1977 66 16.4
Carnarvon Airport 24.1 23.6 in 1999 63 22.1
Dalwallinu Comparison 19.6 19.5 in 1977 54 17.6
Mardie 25.9 25.8 in 2004 53 24.4
Pearce RAAF 18.5 18.3 in 1977 49 16.3
Albany Airport 15.1 14.9 in 1999 45 13.5
Onslow Airport 25.8 25.1 in 1972 44 23.7
Lancelin 19.1 18.2 in 1994 43 17.2
Jurien Bay 18.9 18.5 in 1999 41 16.8
Gascoyne Junction 25.2 24.8 in 1973 37 23.1
Learmonth Airport 24.6 23.9 in 1979 35 22.5
Kalbarri 22.2 20.5 in 1977 34 19.1


Summary statistics for summer 2010-11
Maximum temperatures
for summer
(°C)
Minimum temperatures
for summer
(°C)
Rainfall
for summer
(millimetres)
Mean for
summer
2010-11
Diff
from
average
Highest for
summer
2010-11
Mean for
summer
2010-11
Diff
from
average
Lowest for
summer
2010-11
Total for
summer
2010-11
Average
for
summer
Rank of
summer
2010-11
Fraction of
summer
average
North Kimberley (district 01)
Doongan 31.9   39.2 8 Dec 2010 22.4   19.5 2 Dec 2010 1535.5
Kalumburu 32.3   37.7 8 Dec 2010 24.1   21.2 23 Jan 2011 1286.0
Truscott 31.1   35.6 8 Dec 2010 24.7   21.5 31 Jan 2011 1295.0
Wyndham 35.0 -2.0 41.8 7 Dec 2010 25.7 -0.7 21.4 28 Jan 2011 863.4 542.8 v high 159%
Wyndham Aero 34.9   42.6 7 Dec 2010 25.7   21.1 28 Jan 2011 768.6
East Kimberley (district 02)
Argyle Aerodrome 35.0   41.2 7 Dec 2010 24.8   20.0 2 Dec 2010 593.0
Halls Creek Airport 35.3 -1.5 41.4 8 Dec 2010 24.1 -0.2 19.6 1 Dec 2010 387.6 377.6 average 103%
Kununurra Aero 33.9   40.6 6 Dec 2010 24.4   20.8 2 Dec 2010 849.8 556.2 v high 153%
Warmun 35.3 -2.0 42.1 7 Dec 2010 24.2 -0.6 18.6 2 Dec 2010 612.8 471.0 high 130%
West Kimberley (district 03)
Bidyadanga 33.8 -0.7 41.6 24 Dec 2010         609.9 315.7 high 193%
Broome Airport 32.7 -0.7 39.3 24 Dec 2010 25.9 -0.3 21.6 28 Jan 2011 807.2 414.4 v high 195%
Curtin Aero 35.2   42.2 9 Dec 2010 24.4   21.6 28 Dec 2010 949.4
Derby Aero 34.0   40.0 23 Dec 2010 25.3   21.6 12 Jan 2011 933.4 467.0 v high 200%
Fitzroy Crossing Aero 37.0   43.5 9 Dec 2010 24.5   20.9 1 Dec 2010 671.6
West Roebuck 33.7   41.3 24 Dec 2010 24.9   21.5 18 Jan 2011 888.6
De Grey (district 04)
Karratha Aero 34.4   41.7 24 Dec 2010 26.6   23.3 25 Feb 2011 591.0 140.5 v high 421%
Legendre Island 32.8   36.3 25 Jan 2011 26.7   23.3 17 Dec 2010
Mandora 34.7 -1.5 43.0 10 Dec 2010     21.6 24 Dec 2010 364.3 216.6 high 168%
Pardoo Station 35.7   42.5 11 Jan 2011     19.0 13 Dec 2010 391.8 160.3 v high 244%
Port Hedland Airport 35.0 -1.4 42.0 11 Jan 2011 26.0 +1.0 22.5 14 Jan 2011 467.4 173.9 v high 269%
Roebourne 36.8 -1.8 45.2 26 Dec 2010     21.8 4 Dec 2010 405.3 138.3 v high 293%
Roebourne Aero 36.2   44.5 26 Dec 2010 26.2   21.5 1 Dec 2010 439.2
Fortescue (district 05)
Learmonth Airport 35.9 -1.5 42.9 25 Dec 2010 24.6 +2.1 19.1 3 Dec 2010 370.2 82.0 v high 451%
Mardie 35.5 -2.2 44.6 25 Dec 2010 25.9 +1.5 21.2 4 Dec 2010 614.8 106.8 v high 576%
Onslow 34.5 -1.0 43.0 5 Feb 2011 26.3 +3.1 20.2 4 Dec 2010 364.2 86.6 v high 421%
Onslow Airport 35.1 -1.1 43.1 5 Feb 2011 25.8 +2.1 20.4 4 Dec 2010 403.0 110.7 v high 364%
Wittenoom 37.0 -2.0 44.2 27 Dec 2010 25.1 -0.5 19.5 1 Dec 2010 465.9 265.0 high 176%
West Gascoyne (district 06)
Carnarvon Airport 32.7 +1.8 44.2 11 Dec 2010 24.1 +2.0 18.3 5 Dec 2010 409.2 38.7 highest 1057%
Denham 32.4   41.7 11 Dec 2010 24.5   17.9 5 Dec 2010 271.9 25.7 highest 1058%
Emu Creek Station 38.6 -1.9 46.4 28 Dec 2010 25.4 +1.5 19.3 4 Dec 2010 282.3 126.6 high 223%
Gascoyne Junction 38.3 -1.5 47.6 1 Jan 2011 25.2 +2.1 18.1 3 Dec 2010
Shark Bay Airport 34.4   45.6 26 Dec 2010 23.2   16.6 4 Dec 2010 366.0
East Gascoyne (district 07)
Newman Aero 38.1   44.5 18 Jan 2011 24.8   19.2 29 Jan 2011 250.6 176.8 high 142%
Paraburdoo Aero 38.6   46.5 28 Dec 2010 25.2   18.6 1 Dec 2010 288.0 157.2 high 183%
Murchison (district 07A)
Meekatharra Airport 36.5 -0.6 44.9 31 Dec 2010 23.7 +0.3 16.0 5 Dec 2010 307.6 78.0 highest 394%
Mount Magnet Aero 35.6   45.4 31 Dec 2010 23.3   14.0 3 Dec 2010 247.4
North Coast (district 08)
Dalwallinu 34.3   43.2 27 Dec 2010 19.2   8.5 5 Dec 2010 74.8
Dalwallinu Comparison 34.6 +0.4 43.2 27 Dec 2010 19.6 +2.0 10.1 4 Dec 2010 76.6 42.9 high 179%
Geraldton Airport 33.4 +2.2 45.5 26 Dec 2010 20.6 +2.7 11.2 10 Dec 2010 83.6 22.7 v high 368%
Kalbarri 34.3 +1.5 42.8 26 Dec 2010 22.2 +3.1 12.0 5 Dec 2010 128.9 17.1 highest 754%
Morawa Airport 36.3   45.3 27 Dec 2010 21.2   10.9 4 Dec 2010 185.8
Mullewa 35.9 0.0 44.2 27 Dec 2010 21.6 +2.9 12.5 6 Dec 2010 304.5 39.8 highest 765%
North Island 29.4   35.7 14 Feb 2011 23.1   17.7 7 Dec 2010 69.0
Wongan Hills 34.4 +0.7 43.5 27 Dec 2010 18.7 +1.5 9.5 4 Dec 2010 47.0 39.0 average 121%
Central Coast (district 09)
Bickley 30.9   38.8 27 Dec 2010 16.2   8.4 4 Dec 2010 55.2 49.3 high 112%
Champion Lakes 32.2   39.9 25 Dec 2010 19.4   9.5 4 Dec 2010 43.6
Garden Island HSF 29.1   37.5 21 Feb 2011 19.5   13.5 10 Dec 2010 32.0
Gingin Aero 33.5   41.5 27 Dec 2010 17.9   4.6 4 Dec 2010 77.0
Jandakot Aero 32.6   41.0 27 Dec 2010 17.9   5.5 4 Dec 2010 42.2 42.6 average 99%
Jurien Bay 31.8 +2.3 43.0 26 Dec 2010 18.9 +2.1 11.9 4 Dec 2010 36.9 28.6 high 129%
Karnet 30.6 +0.8 38.0 2 Jan 2011 16.1 +1.3 5.5 4 Dec 2010 48.1 53.9 average 89%
Lancelin 31.3 +2.7 41.0 27 Dec 2010 19.1 +1.9 12.0 3 Dec 2010 17.0 27.5 average 62%
Medina Research Centre 32.0   40.5 27 Dec 2010 18.5   7.5 4 Dec 2010 31.1
Pearce RAAF 33.9 +1.6 42.1 27 Dec 2010 18.5 +2.2 5.7 4 Dec 2010 27.8 26.3 average 106%
Perth Airport 33.0 +2.2 41.8 29 Jan 2011 18.5 +2.1 5.8 4 Dec 2010 59.6 34.4 high 173%
Perth Metro 32.0   40.4 29 Jan 2011 19.0   9.4 4 Dec 2010 48.0
Rottnest Island 27.7   35.7 21 Feb 2011 19.7   13.8 3 Dec 2010 80.0
Swanbourne 31.4   39.6 28 Feb 2011 18.9   10.3 4 Dec 2010 38.6
South Coast (district 09A)
Albany 22.1 -0.4 37.9 5 Jan 2011 17.0 +2.2 10.2 3 Dec 2010 135.0 76.6 v high 176%
Albany Airport 23.5 -0.8 38.9 5 Jan 2011 15.1 +1.6 7.8 2 Dec 2010 117.8 74.3 high 159%
Bridgetown 29.4   38.4 28 Jan 2011 14.4   3.1 10 Dec 2010 122.6
Bridgetown Comparison 30.0 +1.0 38.5 25 Feb 2011 14.7 +3.0 4.2 10 Dec 2010 117.5 47.8 v high 246%
Bunbury 30.6   37.7 2 Jan 2011 16.4   7.2 4 Dec 2010 71.6
Busselton 29.8   36.8 24 Dec 2010 16.1   7.1 9 Dec 2010 87.0
Busselton Aero 30.5   37.4 26 Feb 2011 15.5   6.0 2 Dec 2010 81.8
Cape Leeuwin 23.8 +1.1 32.7 25 Feb 2011 18.0 +1.4 13.1 4 Dec 2010 110.2 53.7 v high 205%
Cape Naturaliste 27.7 +2.8 35.4 16 Feb 2011 16.5 +1.6 9.0 11 Dec 2010 79.6 35.3 v high 225%
Collie East 31.0   39.2 26 Feb 2011 15.0   5.2 10 Dec 2010 78.4
Donnybrook 31.3 +1.6 39.8 28 Jan 2011 16.3 +2.8 7.5 4 Dec 2010 83.9 43.3 high 194%
Dwellingup 31.0 +2.2 38.2 27 Dec 2010 15.7 +2.0 6.6 4 Dec 2010 68.4 57.0 high 120%
Esperance 25.4 -0.2 42.6 22 Jan 2011 16.3 +1.0 11.2 12 Dec 2010 80.2 70.2 high 114%
Esperance Aero 26.6   44.6 28 Jan 2011 15.1   9.7 16 Dec 2010 83.0 71.4 high 116%
Harvey 31.7   39.0 28 Jan 2011 16.3   7.2 3 Dec 2010 73.2
Hopetoun North 24.2   41.7 22 Jan 2011 15.5   10.1 12 Jan 2011 120.8
Jarrahwood 30.4   39.5 25 Feb 2011 14.4   3.2 10 Dec 2010 103.8 44.4 high 234%
Mandurah 30.2   40.1 25 Dec 2010 19.5   12.1 4 Dec 2010 48.6
Manjimup 27.5 +1.2 36.6 25 Feb 2011 14.1 +1.4 8.4 11 Dec 2010 130.6 63.9 v high 204%
North Walpole 23.9   35.1 13 Jan 2011 15.3   9.9 3 Dec 2010 201.4
Pemberton 26.8 +1.4 37.1 25 Feb 2011 14.7 +1.8 7.6 2 Dec 2010 108.7 76.2 high 143%
Rocky Gully 26.4   37.4 13 Jan 2011 13.7   6.3 2 Dec 2010 109.4
Witchcliffe 27.2   36.1 24 Feb 2011 15.0   6.7 10 Dec 2010
North Central (district 10)
Cunderdin Airfield 34.1   44.2 28 Jan 2011 17.9   6.5 4 Dec 2010 57.2
Merredin 33.3 +0.4 43.4 28 Jan 2011 18.1 +1.0 9.8 4 Dec 2010 113.8 43.7 v high 260%
Northam 34.0 +0.7 43.9 28 Jan 2011 18.1 +1.6 7.6 4 Dec 2010 66.4 33.2 high 200%
York 33.6   43.0 28 Jan 2011 17.0   5.5 4 Dec 2010 41.9
South Central (district 10A)
Beverley 33.6 +0.3 42.4 28 Jan 2011 17.2 +1.5 7.0 4 Dec 2010 59.0 35.3 high 167%
Brookton 32.2 +0.2 42.4 28 Jan 2011     7.5 4 Dec 2010 51.8 37.3 high 139%
Corrigin 31.8 +0.3 43.6 28 Jan 2011 16.5 +1.3 8.4 4 Dec 2010 54.0 45.9 high 118%
Hyden 32.7 -0.1 45.5 28 Jan 2011 16.5 +1.5 6.5 10 Dec 2010 66.0 52.9 average 125%
Jacup 25.9   44.0 28 Jan 2011 13.5   5.6 11 Dec 2010 102.2
Katanning 28.8   43.5 28 Jan 2011 13.9   4.8 10 Dec 2010 106.8
Katanning Comparison 28.9 -0.5 41.8 28 Jan 2011 14.2 +1.0 5.0 10 Dec 2010 104.3 46.4 v high 225%
Lake Grace 30.0   44.4 28 Jan 2011 15.5   7.4 10 Dec 2010 24.6
Lake Grace Comparison 29.9 -0.7 44.0 28 Jan 2011 15.5 +1.0 7.3 10 Dec 2010 21.6 50.9 low 42%
Narembeen 33.4 +0.5 43.9 28 Jan 2011 17.1 +1.2 8.1 4 Dec 2010 61.9 45.7 high 135%
Narrogin 30.2 +0.2 42.0 28 Jan 2011 15.4 +1.9 8.2 10 Dec 2010 70.6 42.0 high 168%
Newdegate Research Station 30.0   45.1 28 Jan 2011 14.2   3.8 10 Dec 2010 42.4 53.9 average 79%
Ongerup 26.7 -1.2 41.6 28 Jan 2011 14.4 +0.9 5.4 10 Dec 2010 71.0 53.9 high 132%
Pingelly 31.5 +0.5 42.1 28 Jan 2011 16.0 +0.9 8.4 10 Dec 2010 47.6 36.4 high 131%
Wagin 30.2 0.0 42.2 28 Jan 2011 14.9 +0.9 7.0 10 Dec 2010 115.1 40.4 v high 285%
Wandering 31.6   42.4 28 Jan 2011 15.2   5.9 4 Dec 2010 46.2
Eucla (district 11)
Balladonia 29.5 -1.2 45.9 29 Jan 2011 16.0 +1.8 7.7 10 Dec 2010 91.4 57.1 high 160%
Eucla 25.3 -0.2 47.1 29 Jan 2011 16.8 +0.6 9.1 16 Dec 2010 111.9 52.1 v high 215%
Eyre 26.6 +0.5 45.9 29 Jan 2011 16.3 +1.2 6.2 22 Jan 2011 139.3 52.3 v high 266%
Forrest 30.6   48.4 30 Jan 2011 16.5   8.6 10 Dec 2010 224.4
Red Rocks Point 24.0   45.3 29 Jan 2011 17.5   9.5 16 Dec 2010 190.2
South East (district 12)
Bulga Downs 35.3   43.5 23 Jan 2011 22.0   14.0 18 Dec 2010 266.6 71.3 v high 374%
Kalgoorlie-Boulder Airport 31.3 -1.3 44.9 28 Jan 2011 18.2 +0.6 11.4 4 Dec 2010 140.6 71.9 high 196%
Laverton Aero 33.5   45.8 28 Jan 2011 21.0   14.3 6 Feb 2011 297.6
Leonora 34.2 -1.7 46.2 28 Jan 2011 21.3 +0.4 15.1 18 Dec 2010 261.7 72.2 v high 362%
Leonora Aero 34.1   45.9 28 Jan 2011 21.6   15.2 18 Dec 2010 221.2
Munglinup West 27.0   45.3 28 Jan 2011 14.4   8.8 4 Dec 2010
Norseman Aero 30.9   45.6 28 Jan 2011 16.0   4.5 10 Dec 2010 83.4
Salmon Gums Res.Stn. 29.8 +0.1 46.3 28 Jan 2011 14.3 +1.0 1.7 10 Dec 2010 58.2 70.4 average 83%
Southern Cross Airfield 32.8   44.5 28 Jan 2011 18.1   7.4 4 Dec 2010 129.8
Yeelirrie 35.8 -0.9 45.4 31 Dec 2010 22.3 +1.2 14.4 8 Dec 2010 267.4 80.4 v high 333%
North East (district 13)
Giles Meteorological Office 37.3 +1.0 44.8 28 Jan 2011 24.0 +1.3 15.3 7 Feb 2011 160.7 118.6 high 135%
Telfer Aero 39.2 -0.6 46.4 31 Jan 2011 25.9 +0.3 22.7 15 Feb 2011 216.0 198.0 average 109%
Warburton Airfield 38.0 +1.0 46.5 28 Jan 2011 24.1 +2.2 15.1 7 Feb 2011 160.8 96.6 high 166%
Wiluna 37.3 +0.2 45.4 31 Dec 2010 23.5 +1.5 15.5 17 Dec 2010 159.8 94.9 high 168%

Notes

A 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 2 pm on Tuesday 1 March 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 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.

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