Western Australia in April 2011: Cool and wet in the northeast, warm in the southwest

  • Rainfall: Above average for WA; near average for southwest WA.
  • Maximum temperature: Near average for WA; 4th highest on record for southwest WA.
  • Minimum temperature: Near average for WA; above average for southwest WA.

Rainfall

April 2011 rainfall was above to very much above average over much of the Kimberley, as well as in parts of the west Pilbara and Southwest districts. Wyndham, Lake Argyle Resort and Dampier Downs in the Kimberley observed their wettest April on record, mainly due to heavy monsoonal rainfall during the first part of the month. In contrast, much of the remainder of the southern half of the state observed below average rainfall, with areas of very much below average in the eastern Interior and western Gascoyne (see April 2011 rainfall totals & deciles).

When averaged across the state, rainfall during April 2011 was above average; while the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed near average April rainfall.

Very heavy rainfall in the north Kimberley, due to a tropical low near the north Kimberley coast resulted in Wyndham and Mount Barnett observing their wettest April days on record on the 4th and 5th respectively. The wettest day in April 2011 also occurred during this event with Mount Hart Station observing 206.0 mm, which is their third wettest day on record behind the 338.0 mm observed on 9 April 1995 and the 259.1 mm observed on 12 February 1974. A low off the Pilbara coast resulted in heavy rainfall over the east Pilbara where Telfer observed its wettest April day on record on the 8th. A middle level cloud band brought heavy rainfall to the west Pilbara, with Glen Florrie Station in the inland west Pilbara observing 125.0 mm in the 24 hours to 9am on the 10th, their wettest April day on record. Several cold fronts crossed the southwest of WA over the Easter weekend, with daily totals in southern parts of the Southwest Land Division mostly in the 10 to 20 mm range with isolated heavier falls.

The 2010/11 northern wet season has been particularly wet in northern parts of Western Australia (see table below). Very warm sea surface temperatures combined with an active monsoon trough that was present across northern Australia for much of the wet season resulted in record rainfall at a number of sites in the Kimberley. Heavy rainfall was also observed over the summer months in the Gascoyne and far northern Southwest Land Division resulting in several flooding events and record rainfall. Please refer to the Monthly Weather Review for information on specific events.

Maximum temperature

April 2011 maximum temperature was above to very much above average in western and southern parts of WA where Geraldton, Kalbarri and Esperance observed their hottest April on record. In contrast, below to very much below average mean maxima were observed in the northeast of WA, with Warmun, Wyndham and Troughton Island observing their coolest April on record (see April 2011 mean maximum temperature decile & anomaly maps)

When averaged across the state as a whole, mean maximum temperature during April 2011 was near average; however, the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed its fourth hottest April on record (comparable records commenced in 1950).

A cool day of just 16.2 °C was observed at Wiluna in the far northern Goldfields on the 29th, which is their coolest April day in 52 years of record.

The Lower Southwest has experienced its hottest January to April on record in terms of mean maximum temperature (comparable records commenced in 1950) due an above average January, an above average February, 3rd hottest March and an above average April.

Minimum temperature

The pattern of mean minimum temperature during April 2011 was similar to the maximum temperature pattern, with above to very much above average overnight temperature in western parts of WA, and below to very much below average in the northeast of the state. (see April 2011 minimum temperature decile & anomaly maps). Wyndham in the east Kimberley observed their coolest April on record with a mean minima of 15.9 °C during April 2011; while Hyden in the Great Southern observed its warmest with 13.8 °C.

When averaged across the state as a whole, mean minimum temperature during April 2011 was near average; however, the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed above average mean minima, with its fourteenth warmest April on record (comparable records commenced in 1950).

A warm night was experienced in the Southwest on the 6th, with Cape Leeuwin observing 21.6 °C, their warmest April night in 105 years of record.

The Lower Southwest has experienced its hottest January to April on record in terms of mean minimum temperature (comparable records commenced in 1950) due the 3rd warmest January, equal warmest February, 4th warmest March and an above average April.

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Extremes in April 2011
Hottest day 40.0 °C at Roebourne on the 14th
Warmest days on average 35.6 °C at Roebourne
Coolest days on average 22.7 °C at Shannon
Coldest day 15.0 °C at Shannon on the 28th
Coldest night 1.5 °C at Eyre on the 21st
Coolest nights on average 8.9 °C at Collie East
Warmest nights on average 26.4 °C at Varanus Island
23.5 °C at Onslow
Warmest night 28.7 °C at Barrow Island Airport on the 1st
27.6 °C at Onslow on the 5th
Wettest overall 461.9 mm at Faraway Bay
Wettest day 206.0 mm at Mount Hart Station on the 5th
Highest wind gust 111 km/h at Cape Leeuwin on the 7th

Record highest April daily rainfall
Highest daily rainfall
in April 2011 (mm)
Previous wettest
for April
Years of
record
Greenbushes 64.0 on the 24th 60.2 on the 1st in 2005 105
Glen Florrie Station 125.0 on the 10th 88.9 on the 15th in 1961 63
Mount Barnett 58.8 on the 5th 53.6 on the 25th in 1992 45
Wyndham 148.4 on the 4th 73.9 on the 25th in 1975 44
Telfer Aero 72.8 on the 8th 60.0 on the 4th in 2000 38



Record highest total April rainfall
Total rainfall
for April 2011 (mm)
Previous wettest
for April
Years of
record
Average for
April
Wyndham 347.8 149.4 in 2000 44 36.2
Lake Argyle Resort 116.7 95.6 in 1995 42 24.1
Dampier Downs 171.7 93.8 in 1992 37 19.9



Record highest total northern wet season (October to April) rainfall
Total rainfall
for October to April 2010-11 (mm)
Previous wettest
for October to April
Years of
record
Average for
October to April
Mullewa 308.0 295.5 in 1914 108 100.2
Cocos Island Airport 2240.4 2060.5 in 1970 106 1139.9
Warmun 1699.9 1422.1 in 1999 100 694.9
Marron 540.6 359.8 in 2007 97 88.9
Kimberley Downs 1203.5 1163.4 in 1966 85 644.7
Myroodah 879.9 813.7 in 1981 84 491.6
Gibb River 2111.8 1265.1 in 1973 81 742.7
Cape Leveque 1422.8 1418.8 in 1973 79 695.6
Carnarvon Airport 475.8 276.5 in 1962 66 78.7
Carnegie 432.4 432.0 in 1966 53 185.7
Mount Amhurst 1034.4 798.6 in 2001 49 450.3
Cygnet Bay 1474.9 1281.2 in 1983 45 705.3
Mount Barnett 1663.6 1561.4 in 1914 41 874.9
Wyndham 1708.0 1611.0 in 2005 41 806.8
Theda 2368.2 1814.2 in 1996 40 1223.9
Yulmbu 1623.4 1091.0 in 2001 40 619.1
Mount Elizabeth 1813.2 1508.3 in 1999 35 954.1
Mount Hart Station 1984.0 1605.2 in 1996 35 1000.2



Record lowest April daily maximum temperature
Lowest daily maximum
temperature
in April 2011 (°C)
Previous coolest
for April
Years of
record
Average for
April
Wiluna 16.2 on the 29th 16.7 on the 27th in 1964 52 29.2
Troughton Island 27.1 on the 14th 27.8 on the 23rd in 1960 32 32.8



Record highest April mean daily maximum temperature
Mean daily maximum
temperature
for April 2011 (°C)
Previous warmest
for April
Years of
record
Average for
April
Geraldton Airport 30.2 30.0 in 1978 68 27.6
Esperance 25.2 25.1 in 1994 41 23.1
Kalbarri 32.1 31.6 in 1991 36 29.3



Record lowest April mean daily maximum temperature
Mean daily maximum
temperature
for April 2011 (°C)
Previous coolest
for April
Years of
record
Average for
April
Warmun 31.3 31.9 in 1983 48 35.2
Wyndham 31.7 33.5 in 2000 43 36.0
Troughton Island 30.4 31.4 in 2006 31 32.8



Record highest April daily minimum temperature
Highest daily minimum
temperature
in April 2011 (°C)
Previous warmest
for April
Years of
record
Average for
April
Cape Leeuwin 21.6 on the 6th 21.1 on the 18th in 1988 105 15.4



Record lowest April temperature
Lowest temperature
in April 2011 (°C)
Previous coolest
for April
Years of
record
Average for
April
Wyndham 15.9 on the 20th 16.0 on the 26th in 2008 44 23.7



Record highest April mean daily minimum temperature
Mean daily minimum
temperature
for April 2011 (°C)
Previous warmest
for April
Years of
record
Average for
April
Hyden 13.8 13.4 in 1981 37 11.0





Summary statistics for April 2011
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2011
Diff
from
average
Highest for
April
2011
Mean for
April
2011
Diff
from
average
Lowest for
April
2011
Total for
April
2011
Average
for
April
Rank of
April
2011
Fraction of
April
average
North Kimberley (district 01)
Doongan 29.8 -3.5 32.2 8th 18.3 -0.7 11.6 20th 300.5 50.7 v high 593%
Kalumburu 31.8 -3.1 34.7 26th 20.8 -0.3 13.8 20th 204.0 43.8 v high 466%
Troughton Island 30.4 -2.4 32.3 12th 25.7 -1.1 23.5 14th 336.8 32.0 v high 1053%
Wyndham 31.7 -4.3 34.3 26th 21.8 -1.9 15.9 20th 347.8 36.2 highest 961%
Wyndham Aero 32.1 -4.9 35.1 26th 22.2 -1.4 16.3 20th 315.6 28.6 v high 1103%
East Kimberley (district 02)
Argyle Aerodrome 31.0 -4.1 33.7 10th 20.6 -2.4 15.9 18th
Halls Creek Airport 29.7 -4.2 33.3 15th 18.1 -2.4 13.6 19th 61.2 21.0 v high 291%
Kununurra Aero 31.4 -4.0 34.4 8th 20.5 -1.6 14.7 19th 109.0 28.3 v high 385%
Warmun 31.3 -3.9 34.2 8th 19.1 -1.6 13.5 19th 90.0 25.0 v high 360%
West Kimberley (district 03)
Broome Airport 33.0 -1.3 35.6 15th 21.5 -1.1 15.4 19th 17.6 26.7 average 66%
Curtin Aero 33.2 -3.3 36.6 16th 20.9 -1.5 17.0 20th 259.6 49.1 v high 529%
Cygnet Bay 31.6 -2.0 33.2 17th 21.6 -0.7 15.6 20th 107.3 39.9 high 269%
Derby Aero 32.6 -3.0 35.2 16th 21.2 -1.6 15.4 19th 64.2 26.5 v high 242%
Fitzroy Crossing Aero 33.4 -3.4 36.3 15th 19.5 -1.3 14.6 19th 100.2 36.0 high 278%
West Roebuck 34.0   36.8 15th 20.6   13.6 19th 25.6 40.6 high 63%
De Grey (district 04)
Bedout Island 31.3   34.0 1st 26.0   23.0 6th
Karratha Aero 33.7 -0.5 37.8 13th 22.8 +0.2 18.5 21st 21.4 18.3 high 117%
Legendre Island 32.3   36.7 13th 25.3   22.2 29th
Mandora     38.0 15th 21.0 +0.2 14.0 20th 4.8 20.4 average 24%
Marble Bar 34.6 -1.7 37.7 13th 22.0 -0.2 16.4 20th 7.4 20.5 average 36%
Pardoo Station 34.5 -1.0 37.5 14th     14.0 17th 0.2 19.3 average 1%
Port Hedland Airport 34.3 -0.9 36.9 15th 22.2 +0.8 17.8 19th 0.4 22.7 average 2%
Roebourne 35.6 +0.3 40.0 14th 21.2 -1.0 18.0 20th 11.8 28.7 average 41%
Roebourne Aero 34.8   38.8 14th 21.8   16.1 21st 12.6 6.8 high 185%
Fortescue (district 05)
Barrow Island Airport 31.3 +0.3 33.0 25th 25.0 +0.5 22.1 21st 39.6 48.2 average 82%
Learmonth Airport 33.6 +0.4 36.7 7th 20.7 +0.3 17.7 15th 5.4 15.9 average 34%
Mardie 35.3 -0.5 38.3 2nd 22.5 +1.5 18.5 22nd 10.2 19.9 average 51%
Onslow 33.3 +0.1 36.7 2nd 23.5 +3.1 20.5 22nd 29.2 20.3 high 144%
Onslow Airport 33.6 -0.1 36.9 2nd 22.8 +1.6 19.7 28th 32.0 12.2 high 262%
Wittenoom 32.3 -0.8 34.5 14th 21.1 -0.1 15.8 20th 27.0 28.7 average 94%
West Gascoyne (district 06)
Carnarvon Airport 31.4 +2.4 38.1 1st 20.3 +1.2 16.1 30th 44.6 14.3 v high 312%
Denham 30.2 +1.8 37.0 5th 22.0 +2.5 16.5 30th 0 14.2 lowest 0%
Emu Creek Station 35.2 +0.3 38.2 9th 21.6 +0.9 18.6 18th 52.2 20.5 high 255%
Gascoyne Junction 34.7 +1.9 37.9 15th 20.7 +2.1 16.2 19th 3.8 14.8 average 26%
Murchison 32.9 +2.2 36.6 21st 17.4 +1.3 10.5 30th 0.5 23.6 v low 2%
Shark Bay Airport 32.5 +1.9 38.3 5th 19.7 +1.8 15.0 30th 0.8 10.9 low 7%
East Gascoyne (district 07)
Newman Aero 31.5 -0.2 34.3 21st 18.0 +0.7 12.5 19th 31.4 19.9 average 158%
Paraburdoo Aero 33.6 +0.2 35.7 22nd 20.9 +1.3 15.1 21st 49.8 27.1 high 184%
Murchison (district 07A)
Meekatharra Airport 30.1 +0.9 34.6 21st 17.6 +0.6 12.8 30th 9.2 20.5 average 45%
Mount Magnet Aero 30.2 +1.6 35.5 21st 17.2 +1.1 9.4 30th 9.4 21.8 average 43%
North Coast (district 08)
Carnamah 29.8 +2.3 37.7 22nd 15.9 +1.9 8.8 30th 5.5 22.6 low 24%
Dalwallinu 28.0 +1.1 35.6 6th 14.0 +1.0 7.8 30th 2.6 10.6 low 25%
Dalwallinu Comparison 28.3 +1.6 35.2 6th 15.0 +1.5 9.4 29th 4.3 20.8 low 21%
Geraldton Airport 30.2 +2.6 38.0 16th 17.3 +1.9 9.0 30th 18.6 23.9 average 78%
Kalbarri 32.1 +2.8 37.7 1st 18.5 +2.4 13.3 12th 2.6 18.2 low 14%
Morawa Airport 30.0 +1.2 36.8 6th 15.4 +1.2 9.2 30th 14.6 14.0 average 104%
Mullewa 30.7 +2.1 36.8 6th 17.1 +2.1 11.0 30th 3.0 21.2 low 14%
North Island 28.5 +2.7 34.5 3rd 22.0 +1.9 17.1 22nd 4.8 15.6 average 31%
Wongan Hills 28.0 +1.7 35.8 6th 14.0 +0.7 7.0 30th 6.4 22.5 low 28%
Central Coast (district 09)
Badgingarra Research Stn 28.4 +1.3 35.6 22nd 15.2 +1.8 8.3 30th 18.0 27.7 average 65%
Bickley 25.0 +1.6 33.2 16th 13.5 +1.1 8.6 8th 34.0 55.7 average 61%
Champion Lakes 26.6   34.2 16th 16.1   10.7 8th 28.2
Garden Island HSF 26.0   33.7 5th 17.2   12.4 29th 20.6 44.5 low 46%
Gingin Aero 28.0 +1.5 35.7 16th 13.2 +1.5 4.7 30th 19.0 28.8 average 66%
Gosnells City 28.3 +2.1 36.6 16th 15.4 +0.8 9.2 29th 27.8 44.0 average 63%
Jandakot Aero 27.6 +2.0 36.0 16th 13.6 +1.4 5.4 8th 34.2 42.8 average 80%
Jurien Bay 28.5 +2.2 36.0 3rd 15.5 +1.6 8.0 30th 16.2 29.6 average 55%
Karnet 25.3 +2.1 33.0 16th 12.4 +0.7 6.5 8th 46.9 67.5 average 69%
Lancelin 28.4 +3.0 35.5 16th 15.7 +1.3 10.5 9th 8.0 30.6 low 26%
Medina Research Centre 27.6 +2.1 36.5 16th 14.5 +1.3 7.0 29th 21.7 39.7 average 55%
Pearce RAAF 28.3 +2.0 36.1 16th 15.0 +1.7 7.2 30th 16.4 34.7 low 47%
Perth Airport 27.9 +2.4 36.3 16th 14.2 +1.3 6.5 30th 25.4 41.2 average 62%
Perth Metro* 27.3 +1.7 35.7 16th 14.8 +1.2 7.9 30th 19.4 44.1 low 44%
Rottnest Island 25.5 +1.9 32.0 4th 18.4 +1.3 14.2 9th 13.8 36.5 low 38%
Swanbourne 27.6 +2.5 34.6 5th 16.3 +1.3 10.4 29th 19.8 37.0 low 54%
South Coast (district 09A)
Albany 23.0 +2.2 34.3 5th 14.1 +1.4 9.5 23rd 67.6 69.0 average 98%
Albany Airport 23.6 +1.8 34.3 5th 11.7 +0.1 6.4 19th 71.2 62.3 average 114%
Bridgetown 24.4 +1.1 33.5 5th 9.9 +0.9 3.0 19th 91.6 53.2 high 172%
Bridgetown Comparison 25.3 +2.0 34.2 5th 9.8 +1.4 3.8 19th 86.1 46.3 high 186%
Bunbury 25.4 +1.4 30.9 1st 12.5 +1.0 6.1 8th 55.8 36.0 high 155%
Busselton 24.5 +1.1 28.1 6th 12.5 +0.7 6.8 28th 58.2 40.4 high 144%
Busselton Aero 25.2 +1.3 31.3 1st 11.9 +1.1 6.0 19th 70.8 36.2 high 196%
Cape Leeuwin 23.5 +2.3 31.0 4th 16.7 +1.3 12.9 28th 76.2 60.3 average 126%
Cape Naturaliste 24.2 +2.4 29.6 1st 15.3 +1.5 11.0 28th 71.4 44.0 high 162%
Collie East 25.0   33.4 5th 8.9   3.3 19th 64.2
Donnybrook 26.1 +2.1 34.5 5th 12.0 +1.7 6.0 28th 73.4 49.7 high 148%
Dwellingup 24.9 +2.5 33.6 5th 11.2 +1.0 5.0 29th 51.4 67.0 average 77%
Esperance 25.2 +2.1 36.1 23rd 13.6 +0.4 9.5 30th 36.4 46.6 average 78%
Esperance Aero 25.1 +2.0 35.1 6th 13.0 +0.3 8.8 29th 33.4 41.2 average 81%
Harvey 26.2 +1.6 34.8 16th 12.7 +0.6 7.5 9th 91.8 53.1 high 173%
Hopetoun North 25.3 +1.9 37.3 6th 13.1 +0.5 8.3 10th 27.6 41.6 low 66%
Jarrahwood 25.5 +1.9 32.5 5th 9.6 +1.1 2.7 19th 68.8 48.6 high 142%
Mandurah 25.5   31.6 1st 16.8   11.0 29th 29.8 45.7 average 65%
Manjimup 23.5 +2.5 33.4 5th 11.6 +0.9 7.0 19th 69.6 60.6 average 115%
North Walpole 23.7   34.0 5th 13.5   9.6 28th 111.2
Pemberton 24.1 +3.0 33.7 5th 12.3 +1.4 7.2 19th 91.0 75.4 average 121%
Rocky Gully 23.3 +1.4 33.2 5th 11.4 +0.7 5.2 19th 72.6 53.6 high 135%
Shannon 22.7 +1.3 33.1 5th 11.4 +0.7 6.1 19th 97.8 68.8 high 142%
Windy Harbour 23.7 +1.8 32.7 5th 12.6 +0.6 8.3 9th 110.4 71.6 high 154%
Witchcliffe 23.9 +1.5 32.6 5th 12.4 +1.7 6.5 19th 117.2 65.8 high 178%
North Central (district 10)
Bencubbin 27.5 +1.7 34.5 6th 14.5 +1.8 7.2 30th 4.8 22.8 low 21%
Cunderdin Airfield 27.8 +1.5 36.8 6th 12.4 +0.5 3.6 30th 7.8 24.2 v low 32%
Merredin     35.0 6th 13.9 +1.2 6.0 8th 5.0 23.1 low 22%
Northam 27.8 +1.7 36.6 6th 12.3 +0.3 5.1 29th 12.2 23.3 average 52%
York 27.6 +1.5 35.5 6th 10.9 +0.1 5.0 8th 8.0 19.7 average 41%
South Central (district 10A)
Beverley 27.7 +1.7 36.2 6th 11.9 +0.7 4.6 30th 10.6 23.1 average 46%
Brookton 26.4 +1.5 34.7 6th 11.8 +0.7 5.5 29th 11.5 26.0 average 44%
Corrigin 25.7 +1.6 35.0 6th 12.1 +1.0 4.9 30th 13.0 22.8 average 57%
Hyden 28.0 +2.5 36.0 6th 13.8 +2.8 6.0 29th 15.5 23.9 average 65%
Jacup 24.6 +1.8 34.7 6th 10.9 +0.2 5.7 19th 42.2 43.3 average 97%
Katanning 24.4 +1.2 33.2 6th 11.6 +0.8 6.0 19th 27.2 34.5 average 79%
Katanning Comparison 24.6 +1.8 33.3 6th 10.7 +0.4 4.0 19th 23.0 31.0 average 74%
Lake Grace 25.2 +1.1 34.6 6th 12.2 +0.6 6.1 29th 16.2 25.9 average 63%
Lake Grace Comparison 24.7 +0.9 34.1 6th 12.1 +0.6 6.6 29th 14.6 23.3 average 63%
Narembeen 27.0 +1.2 35.1 6th 12.9 +1.0 4.9 29th 21.0 23.1 average 91%
Narrogin 24.9 +1.9 33.2 6th 11.4 +1.0 5.2 29th 11.4 29.8 low 38%
Newdegate Research Station 25.5 +1.5 35.0 6th 10.1 -0.1 4.1 29th 19.0 27.0 average 70%
Ongerup 24.5 +1.9 33.8 6th 11.3 +0.2 6.4 19th 20.6 26.5 average 78%
Pingelly 25.8 +1.9 34.6 6th 12.2 +0.5 6.0 29th 14.2 27.4 average 52%
Ravensthorpe 25.3 +1.7 34.8 6th 12.7 +1.0 7.7 20th 14.1 33.5 average 42%
Wagin 24.9 +1.3 33.2 6th 10.9 +0.3 4.8 9th 11.0 29.1 average 38%
Wandering 25.6 +1.2 34.1 6th 9.8 +0.5 3.3 19th 22.0 31.8 average 69%
Eucla (district 11)
Balgair     32.6 7th 11.0 -0.9 6.0 13th 9.8 21.4 low 46%
Balladonia 26.6 +1.7 36.6 24th 11.8 +0.9 5.9 11th 12.8 20.0 average 64%
Eucla 24.4 +0.8 34.0 7th 13.7 +0.4 7.3 21st 17.8 26.5 average 67%
Eyre 26.0 +2.0 35.5 7th 10.8 -1.1 1.5 21st 8.0 25.3 low 32%
Forrest 25.7 -0.4 32.2 7th 10.3 -1.7 6.9 23rd 1.8 19.5 low 9%
Red Rocks Point 24.8   34.5 7th 14.2   9.0 21st 6.8
South East (district 12)
Bulga Downs 29.7   34.8 23rd 14.5   9.9 30th 17.6 21.4 average 82%
Kalgoorlie-Boulder Airport 26.5 +1.3 34.5 24th 13.6 +1.0 7.1 30th 7.0 21.0 average 33%
Laverton Aero 27.8 +1.3 33.2 24th 15.3 +0.4 11.1 11th 1.4 19.4 v low 7%
Leinster Aero 29.2 +1.6 33.8 23rd 16.0 +0.5 10.7 30th 11.2 29.9 low 37%
Leonora 28.9 +1.0 35.0 24th 15.7 +0.9 11.4 11th 13.8 20.6 average 67%
Leonora Aero 28.6   34.7 24th 15.8   12.2 11th 13.6
Munglinup West 25.7   35.5 6th 12.1   6.9 29th 22.2
Norseman Aero 26.0 +0.9 35.0 24th 11.3 +0.6 1.7 29th 15.8 29.6 low 53%
Salmon Gums Res.Stn. 25.9 +2.2 35.6 23rd 9.8 -0.1 1.7 10th 11.0 27.6 low 40%
Southern Cross Airfield 27.0 +0.9 34.4 23rd 12.4 +1.1 4.2 29th 13.0 26.3 low 49%
North East (district 13)
Carnegie 29.1 -0.9 32.9 12th 14.9 -1.3 10.7 19th 63.3 23.7 high 267%
Giles Meteorological Office 28.9 -0.5 32.8 13th 15.3 -1.2 11.1 11th 0 16.0 lowest 0%
Telfer Aero 32.4 -2.2 35.3 12th 19.8 -0.8 14.2 26th 113.8 20.4 v high 558%
Warburton Airfield 28.7 -0.6 32.7 12th 14.3 -0.9 8.7 23rd 1.2 18.6 average 6%
Wiluna 30.3 +1.1 34.8 20th 16.6 +1.5 11.6 17th 12.7 29.1 average 44%

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 11 am on Monday 2 May 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
(03) 9669 4057
Enquiries