Western Australia in August 2010: Dry in the southwest, wet in the north.

  • Near average rainfall for WA, but very much below average in the southwest and very much above average in the north
  • Near average mean maximum temperature
  • Near average mean minimum temperature

Rainfall

Large areas of the Kimberley, as well as parts of the Interior, Pilbara, Gascoyne and Central West registered above to very much above average rainfall in August 2010.

A middle level cloudband brought widespread rainfall to the Kimberley and adjacent parts of neighbouring districts in the first two days of August, with daily totals ranging from 20 to 50 mm in parts of the southeast Kimberley and northeast Interior. Several sites in the Kimberley registered their highest daily rainfall on record for August during this event. A second cloudband brought moderate rainfall to the Gascoyne and west Pilbara on the 22nd to 24th August, with totals generally in the 10 to 30 mm range.

In contrast, fewer than normal strong frontal systems moved over southern WA in August, resulting in below to very much below average rainfall over most of the Southwest Land Division (SWLD), as well as in parts of the southern Interior and Goldfields.

A dry start to August in southwest WA finally ended on the 12th when a strong cold front and low pressure system passed through the southern half of WA, bringing widespread rainfall to the SWLD. Totals from the event were generally less than 10 mm in the east, grading to 20 to 30 mm in the west, with some heavy falls above 50 mm in the Southwest district. A daily total of 71.0 mm at Witchcliffe on the 12th was the highest daily rainfall in WA for August 2010, whilst Forest Grove recorded its highest August daily fall in 83 years of record. Several weak fronts brought modest rainfall to the western parts of the SWLD in the middle of month, and at the end of August. Moderate falls of generally 10 to 30 mm were reported on the last days of August in the northern SWLD, south and west Gascoyne and Goldfields, as a cloudband develped over the area.

Averaged across the state, the rainfall for August 2010 was near average, but very much below average in southwest WA (see August rainfall totals & decile maps).

Maximum temperature

Mean maximum temperatures were near average for most of the state. Above average mean maxima were mainly confined to the northern Kimberley and western parts of WA, with areas up to 2 °C above normal in the northern Kimberley, west Gascoyne and SWLD. A large area of eastern WA was below average in terms of mean maximum temperature, with up to 3 °C cooler than normal mean maxima in the northeast Interior as a result of greater than normal cloud cover over the region during August (see August maximum temperature decile & anomaly maps). Balgo Hills recorded its lowest August mean maximum temperature in 30 years of record as a result. When averaged over the whole state, however, the August 2010 mean maximum temperature for WA was near average.

Unseasonal cloud and rain brought cool days to the north and east Kimberley in the first few days of August, and to the Pilbara in the last week of August, with daily maxima generally 8 to 10 °C lower than normal. A couple of sites in the northeast Kimberley registered their lowest daily maximum temperature for August on record on the 2nd.

Mount Elizabeth on the central Kimberley plateau, on the other hand, experienced its longest run of consecutive hot days (a hot day is daily maximum temperature exceeding 35 °C) for August in its 17 years of record between the 23rd and 25th (35.9 °C - 23rd, 35.4 °C - 24th, 35.4 °C - 25th).

Minimum temperature

Mean minimum temperatures were near average for much of WA in August 2010. However, above to very much above average mean minimum temperatures were recorded in large parts of the Kimberley, Pilbara and Gascoyne, with mean minima up to 4 °C higher than normal in the central Kimberley. Conversely, large parts of the SWLD saw below to very much below average mean minima, up to 3 °C below normal in the Central Wheat Belt.

Persistent cloudy nights resulted in some unusually high overnight temperatures in the Kimberley, Pilbara and northwest Gascoyne in the second half of August. A mean minimum temperature of 12.3 °C recorded at Gascoyne Junction was its highest mean minimum temperature for August in 46 years of record.

In contrast, predominantly cloudless skies and calm weather produced many chilly nights in southern WA, and many sites registered multiple sub-zero minimum temperatures during the month. Northam, and Pingelly both registered their record lowest August minimum during the month, whilst Eyre recorded a minimum temperature of -6.8 °C on the 11th, the second lowest temperature ever recorded in WA, just behind the -7.2 °C recorded at Eyre on the 17th August 2008. The mean daily minimum for August at Northam was 2.3 °C, surpassing its previous coldest August mean minimum of 2.4 °C recorded in 2008. Northam has 105 years of temperature records. Pearce RAAF also recorded their coldest August on record.

When averaged over the whole state, August 2010 was near average (see August minimum temperature decile & anomaly maps).


Extremes in August 2010
Hottest day 39.0 °C at Wyndham Aero on the 20th
Warmest days on average 33.7 °C at Wyndham Aero
Coolest days on average 15.2 °C at Shannon
Coldest day 9.0 °C at Mount Barker on the 18th
Coldest night -6.8 °C at Eyre on the 11th
Coolest nights on average 0.8 °C at York
Warmest nights on average 23.7 °C at Troughton Island
20.3°C at Truscott (mainland)
Warmest night 25.7 °C at Troughton Island on the 26th
24.9 °C at Kununurra Aero on the 28th (mainland)
Wettest overall 125.8 mm at Witchcliffe
Wettest day 71.0 mm at Witchcliffe on the 12th
Highest wind gust 104 km/h at Cape Naturaliste on the 11th

Record highest August daily rainfall
Highest daily rainfall
in August 2010 (mm)
Previous highest
for August
Years of
record
Fossil Downs 31.0 on the 2nd 30.5 on the 11th in 1933 99
Forest Grove 65.2 on the 12th 61.5 on the 26th in 1962 83
Balgo Hills 51.0 on the 2nd 38.9 on the 15th in 1947 63
Wyndham 1.0 on the 4th 0.0   43
Cherrabun 22.8 on the 2nd 15.0 on the 2nd in 1976 37
Kununurra Aero 3.0 on the 1st 0.4 on the 23rd in 1981 35



Record highest total August rainfall
Total rainfall
for August 2010 (mm)
Previous highest
for August
Years of
record
Average for
August
Cherrabun 25.4 15.0 in 1976 37 1.7
Kununurra Aero 4.2 0.4 in 1981 35 0.1
Wyndham 1.4 0.0   43 0.0



Record lowest August daily maximum temperature
Lowest daily maximum
temperature
in August 2010 (°C)
Previous lowest
for August
Years of
record
Average for
August
Kimberley Res.Station 21.9 on the 3rd 22.3 on the 13th in 1966 57 33.1
Wyndham 22.6 on the 3rd 25.5 on the 2nd in 1990 43 33.6



Record lowest August mean daily maximum temperature
Mean daily maximum
temperature
for August 2010 (°C)
Previous lowest
for August
Years of
record
Average for
August
Balgo Hills 26.7 26.8 in 2008 30 28.9


Record lowest August temperature
Lowest temperature
in August 2010 (°C)
Previous lowest
for August
Years of
record
Average for
August
Northam -1.7 on the 10th -1.5 on the 17th in 2008 101 5.6
Pingelly -1.2 on the 23rd -1.0 on the 29th in 2004 40 5.6



Record highest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2010 (°C)
Previous highest
for August
Years of
record
Average for
August
Gascoyne Junction 12.3 12.2 in 1994 46 9.9



Record lowest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2010 (°C)
Previous lowest
for August
Years of
record
Average for
August
Northam 2.3 2.4 in 2008 105 5.6
Pearce RAAF 6.2 6.3 in 2001 49 8.2



Summary statistics for August 2010
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2010
Diff
from
average
Highest for
August
2010
Mean for
August
2010
Diff
from
average
Lowest for
August
2010
Total for
August
2010
Average
for
August
Rank of
August
2010
Fraction of
August
average
North Kimberley (district 01)
Kalumburu 33.4 0.0 36.1 25th 16.4 +1.7 9.9 13th 0.4 0.2 high 200%
Kuri Bay 32.6 +0.7 36.5 29th 20.7 +1.0 17.0 13th 5.1 1.2 v high 425%
Mount Elizabeth 31.3 +0.9 35.9 23rd 13.9 +4.5 6.6 12th 3.8 2.0 v high 190%
Troughton Island 29.5 +0.7 31.2 24th 23.7 +1.1 21.3 2nd 0.8 0.4 average 200%
Truscott 31.8   34.3 31st 20.3   15.8 13th 3.0
Wyndham 33.1 -0.5 38.5 20th 19.8 +0.9 14.0 13th 1.4 0 highest
Wyndham Aero 33.7   39.0 20th 19.1   12.8 13th 0.4 0.1 high 400%
East Kimberley (district 02)
Argyle Aerodrome 31.5 -0.5 37.4 25th 18.2 +0.8 13.1 7th 5.4 0.3 v high 1800%
Halls Creek Airport 29.3 -0.7 35.7 23rd 16.0 +1.2 10.5 11th 2.4 2.0 high 120%
Kununurra Aero 32.5 -0.1 38.4 20th 17.6 +1.5 11.0 14th 4.2 0.1 highest 4200%
Warmun 32.0 -0.3 38.0 25th 16.6 +1.7 8.9 13th 9.5 1.4 v high 679%
West Kimberley (district 03)
Bidyadanga 30.7 -0.2 36.5 24th 16.6 +1.7 11.0 7th 5.8 2.2 high 264%
Broome Airport 30.3 +0.1 35.2 24th 17.0 +2.1 11.8 10th 1.6 1.7 high 94%
Curtin Aero 32.4 -0.6 37.4 24th 17.3 +1.3 12.4 16th 2.0 2.0 high 100%
Cygnet Bay 29.6 -0.1 33.5 31st 17.2 +2.5 10.0 15th 0 1.1 lowest 0%
Derby Aero 31.7 -0.9 36.4 24th 17.6 +1.4 12.7 12th 0 0.8 lowest 0%
Fitzroy Crossing Aero 32.3 -1.1 38.1 21st 16.0 +2.2 8.4 8th 15.6 1.4 v high 1114%
West Roebuck 31.6 -0.4 36.8 24th 16.0 +3.1 8.8 10th 4.4 3.2 high 138%
De Grey (district 04)
Bedout Island 26.4   29.0 31st 20.7   18.0 10th
Karratha Aero 28.1 +0.1 34.0 30th 16.0 +1.8 11.5 11th 0.2 4.9 average 4%
Legendre Island 26.2   33.0 30th 19.0   17.0 6th
Mandora 30.5 -0.2 35.8 29th 14.1 +0.8 7.5 8th 0 2.6 lowest 0%
Marble Bar 28.9   35.8 30th 14.4   7.1 10th 0.8 0.4 high 200%
Pardoo Station 29.9 -0.1 33.2 30th 14.8 +1.3 10.0 11th 0 4.9 lowest 0%
Port Hedland Airport 29.6 +0.5 33.2 29th 15.0 +1.9 9.2 11th 2.4 5.0 high 48%
Roebourne 30.2 +1.2 36.0 30th 15.4 +0.9 11.2 7th 0 5.0 lowest 0%
Roebourne Aero 29.7   35.2 30th 14.2   8.6 11th 0 1.2 v low 0%
Fortescue (district 05)
Barrow Island Airport 24.8 -0.1 28.5 30th 18.3 +0.5 15.9 16th 8.4 3.2 high 263%
Learmonth Airport 25.6 -0.6 29.1 31st 13.1 +1.0 6.4 1st 13.2 12.7 high 104%
Mardie 29.2 -0.3 34.9 30th 14.7 +2.4 9.7 11th 2.6 7.4 average 35%
Onslow 27.1 +0.6 31.7 8th 15.4 +3.0 11.5 2nd 2.2 8.7 average 25%
Onslow Airport 27.6 +0.5 32.4 30th 15.1 +1.8 11.8 2nd 3.4 9.7 average 35%
Tom Price 24.9 -0.7 32.5 30th 9.4 +1.0 5.0 2nd 15.4 10.8 high 143%
West Gascoyne (district 06)
Carnarvon Airport 24.4 +1.5 30.2 4th 12.4 +0.9 7.4 2nd 35.8 18.1 high 198%
Denham 23.0 +0.6 28.4 3rd 14.4 +1.5 10.6 25th 48.2 22.0 v high 219%
Emu Creek Station 27.3 0.0 32.0 29th 14.1 +1.9 9.5 11th 26.9 11.7 high 230%
Gascoyne Junction 25.6 +0.8 31.0 29th 12.3 +2.4 8.9 20th 13.4 12.1 average 111%
Shark Bay Airport 24.2 +0.4 29.8 4th 12.2 +1.5 8.3 14th 54.2 21.0 v high 258%
East Gascoyne (district 07)
Newman Aero 24.4 -1.4 34.3 31st 8.1 +0.6 1.7 10th 15.8 8.0 high 198%
Paraburdoo Aero 26.7 -0.5 34.4 30th 12.2 +1.6 7.4 11th        
Murchison (district 07A)
Meekatharra Airport 22.1 +0.8 30.0 29th 8.9 +0.4 4.8 20th 7.4 11.2 average 66%
Mount Magnet Aero 21.1 +0.2 27.5 29th 8.0 +0.4 4.0 1st 24.0 17.4 average 138%
North Coast (district 08)
Carnamah 20.0 +1.0 25.0 5th 6.6 -0.6 2.4 8th 43.5 52.3 average 83%
Dalwallinu 18.4 +0.5 25.0 28th 5.2 -0.7 0.5 10th 42.2 36.7 high 115%
Dalwallinu Comparison 19.1 +1.0 24.9 28th 5.8 -0.9 2.4 10th 50.0 45.6 average 110%
Geraldton Airport 20.8 +0.8 26.1 11th 7.7 -1.2 4.1 7th 78.0 64.7 high 121%
Kalbarri 23.7 +1.5 29.9 4th 9.8 0.0 5.7 5th 66.1 50.0 high 132%
Morawa Airport 20.0 +0.1 25.6 5th 5.9 -0.2 1.4 3rd 62.2 31.4 high 198%
Mullewa 20.9 +0.8 26.6 5th 8.0 +1.0 4.5 8th 81.5 42.1 v high 194%
North Island 21.8   24.8 3rd 15.5   13.1 16th 56.6 33.3 high 170%
Wongan Hills 18.9 +1.1 25.7 28th 5.4 -1.2 1.4 26th 33.2 51.5 low 64%
Central Coast (district 09)
Badgingarra Research Stn 18.9 +0.7 24.5 4th 6.3 -0.6 1.4 23rd 72.6 83.7 average 87%
Bickley 16.4 +0.6 21.8 28th 6.9 -0.5 2.9 9th 58.6 168.6 v low 35%
Champion Lakes 18.6   24.0 3rd 8.3   3.4 19th 58.8
Garden Island HSF 17.8   21.7 4th 10.0   6.2 5th 83.8
Gingin Aero 19.2 +0.4 24.6 4th 3.8 -2.5 -2.3 10th 85.6 105.9 low 81%
Gosnells City 20.1 +1.0 24.9 3rd 7.1 -1.7 3.2 19th 50.0 126.1 v low 40%
Jandakot Aero 19.2 +0.8 23.9 4th 4.5 -2.4 -0.4 9th 74.6 125.0 v low 60%
Jurien Bay 20.8 +1.0 24.0 1st 6.7 -2.7 2.4 26th 77.5 80.4 average 96%
Karnet 16.8 +1.0 22.0 3rd 4.8 -1.4 0.0 19th 65.8 184.8 v low 36%
Lancelin 20.3 +1.1 24.5 2nd 8.4 -1.5 4.5 5th 54.0 92.1 v low 59%
Medina Research Centre 19.6 +1.0 24.2 2nd 6.4 -1.6 2.0 8th 76.1 115.6 low 66%
Pearce RAAF 19.0 +0.8 24.7 28th 6.2 -2.0 0.7 23rd 52.8 104.3 v low 51%
Perth Airport 19.5 +1.1 24.7 28th 6.0 -2.0 1.2 8th 57.2 117.1 low 49%
Perth Metro 19.1 +0.3 24.1 2nd 6.3 -1.8 1.4 9th 63.0 134.1 v low 47%
Rottnest Island 17.7 0.0 21.7 4th 12.0 -0.2 9.4 19th 92.0 84.9 average 108%
Swanbourne 19.1 +0.5 23.4 3rd 8.6 -1.3 4.5 9th 78.4 113.0 low 69%
South Coast (district 09A)
Albany 16.6 +0.3 22.5 28th 9.1 +0.8 6.2 10th 82.4 126.0 low 65%
Albany Airport 16.2 +0.1 21.6 2nd 7.0 -0.5 3.1 10th 80.6 106.7 low 76%
Bridgetown 16.7 +0.5 20.7 28th 3.7 -1.4 -1.5 9th 59.4 111.6 v low 53%
Bridgetown Comparison 17.8 +1.3 22.1 28th 4.2 -0.4 -1.2 9th 57.8 121.1 v low 48%
Bunbury 18.4 +1.1 21.9 3rd 5.4 -2.2 1.8 28th 64.8 118.0 v low 55%
Busselton 17.6 +0.2 21.2 5th 6.9 -1.4 3.2 9th 89.2 114.6 low 78%
Busselton Aero 17.4 +0.3 20.9 3rd 5.4 -1.7 0.6 9th 70.2 108.8 low 65%
Cape Leeuwin 17.3 +0.9 20.7 2nd 11.4 +0.2 6.9 10th 116.0 136.1 average 85%
Cape Naturaliste 17.3 +0.9 21.0 2nd 9.7 -0.4 6.0 9th 99.2 112.4 average 88%
Collie East 17.9   22.7 28th 2.8   -2.0 10th 41.2
Donnybrook 18.3 +1.1 22.3 4th 5.4 -0.6 1.6 9th 58.1 147.5 v low 39%
Dwellingup 16.7 +1.1 21.5 3rd 3.5 -1.9 -1.0 19th 63.4 192.8 v low 33%
Esperance 17.4 -0.4 23.9 28th 8.8 +0.2 5.4 10th 84.6 81.8 average 103%
Esperance Aero 16.3 -0.9 22.3 5th 7.7 +0.1 4.4 10th 62.6 68.8 average 91%
Harvey 18.1   22.0 3rd 6.4   2.0 19th 51.2 131.2 low 39%
Hopetoun North 18.0 -0.9 24.8 28th 8.5 +0.6 3.5 11th 52.2 54.0 average 97%
Jarrahwood 17.7 +1.1 21.5 3rd 3.5 -1.7 -2.5 9th 64.6 143.3 v low 45%
Mandurah 18.2   21.5 4th 9.7   5.8 9th 70.6
Manjimup 16.0 +1.1 21.3 11th 6.0 -0.5 2.6 9th 74.0 146.4 v low 51%
North Walpole 16.3   21.6 11th 8.3   4.9 9th 83.2
Pemberton 16.2 +0.8 21.0 11th 6.7 -0.3 2.6 9th 75.3 168.3 v low 45%
Rocky Gully 15.3 +0.1 20.5 2nd 6.0 -0.8 3.1 9th 60.8 88.2 low 69%
Shannon 15.2 -0.2 20.1 11th 5.9 -0.9 1.8 9th        
Windy Harbour 17.1 +0.2 22.3 11th 8.4 -0.6 4.7 9th 101.3 160.9 v low 63%
Witchcliffe 16.9 +0.4 20.8 2nd 6.7 -1.4 1.6 10th 125.8 140.5 low 90%
North Central (district 10)
Bencubbin 18.4 +0.8 25.9 28th 5.4 -0.4 1.0 9th 25.6 37.3 low 69%
Cunderdin Airfield 18.7 +1.1 27.0 28th 1.9 -2.4 -2.7 9th 20.6 40.6 v low 51%
Merredin 18.6 +1.4 25.7 28th 4.5 -0.9 -1.3 23rd 17.0 38.8 low 44%
Northam 18.6 +0.7 25.6 28th 2.3 -3.3 -1.7 10th 29.2 60.7 low 48%
York 18.6 +1.0 25.6 28th 0.8 -3.3 -3.0 9th 23.2 57.3 v low 40%
South Central (district 10A)
Beverley 18.7 +1.1 25.4 28th 2.4 -2.6 -2.0 25th 18.4 58.8 v low 31%
Brookton 17.4 +0.7 23.7 28th 3.5 -1.1 -1.2 19th 24.1 62.2 v low 39%
Corrigin 17.3 +1.0 25.4 28th 3.2 -1.5 -1.7 19th 15.6 47.4 v low 33%
Hyden 19.0 +1.7 26.0 28th 3.9 -0.7 -1.5 19th 17.8 40.7 low 44%
Jacup 16.8 +0.3 24.1 28th 4.8 -0.8 0.8 23rd        
Katanning 15.6 +0.4 21.3 28th 5.4 -0.5 2.2 10th
Katanning Comparison 16.2 +0.8 22.5 28th 5.0 -0.5 1.0 23rd 48.8 62.9 low 78%
Lake Grace 17.1 +0.6 24.6 28th 4.7 -0.7 -1.3 23rd 9.0 35.0 v low 26%
Lake Grace Comparison 17.2 +0.8 24.6 28th 5.1 -0.4 -1.3 23rd 6.2 40.0 v low 16%
Narembeen 18.5 +0.9 25.5 28th 4.3 -0.9 -1.5 27th 15.6 41.3 low 38%
Narrogin 16.3 +1.1 23.0 28th 4.1 -1.1 -0.8 23rd 28.4 67.9 v low 42%
Newdegate Research Station 16.7 +0.7 23.6 28th 3.3 -0.9 -2.0 10th
Ongerup 15.9 +0.2 22.8 28th 5.4 -0.4 1.7 3rd 38.6 42.9 average 90%
Pingelly 17.2 +1.3 23.9 28th 4.7 -0.9 -1.2 23rd 27.4 62.0 low 44%
Ravensthorpe 17.2 0.0 23.2 28th 6.6 0.0 2.2 20th 38.3 44.7 average 86%
Wagin 16.6 +0.7 22.8 28th 4.6 -1.0 1.0 3rd 33.9 57.1 low 59%
Wandering 16.8 +0.6 22.9 28th 2.3 -1.5 -2.3 9th 47.0 89.3 v low 53%
Eucla (district 11)
Balladonia 18.5 -0.7 29.6 29th 4.7 -0.6 -1.0 10th 23.0 21.4 average 107%
Eucla 18.2 -0.9 31.4 30th 7.3 -0.1 2.9 21st 33.6 26.4 high 127%
Eyre 18.6 -0.6 29.7 29th 4.1 -2.0 -6.8 11th 27.8 30.0 average 93%
Forrest 18.6 -2.2 31.0 30th 4.6 -1.2 0.0 11th 16.2 15.6 high 104%
Red Rocks Point 17.9   32.4 30th 7.4   2.1 11th 49.8
South East (district 12)
Bulga Downs 22.4   29.2 29th 5.5   -0.4 10th 18.4 15.3 average 120%
Kalgoorlie-Boulder Airport 18.3 -0.3 25.1 29th 5.4 -0.1 0.1 20th 14.2 21.3 average 67%
Laverton Aero 19.8 -0.7 29.7 30th 6.8 -0.2 1.8 19th 2.6 9.6 average 27%
Leinster Aero 20.7 -0.7 30.5 30th 6.9 -0.5 0.5 10th 10.2 9.2 average 111%
Leonora 20.3 -0.3 29.2 29th 6.4 -0.5 1.9 20th 24.0 16.1 high 149%
Leonora Aero 20.3   29.0 29th 6.4   1.1 20th 20.6
Munglinup West 16.8   23.4 28th 6.6   2.4 10th 52.4
Norseman 18.5 +0.1 27.1 29th 4.6 -0.8 -1.5 10th 20.9 25.0 average 84%
Norseman Aero 18.2 -1.0 27.3 29th 3.1 -1.0 -3.1 10th 19.2 22.6 average 85%
Salmon Gums Res.Stn. 16.9 -0.4 25.8 29th 3.9 -0.7 -4.4 10th 26.0 33.3 average 78%
Southern Cross Airfield 18.5 +0.3 25.2 28th 2.9 -0.3 -3.3 23rd 20.2 28.4 average 71%
North East (district 13)
Balgo Hills 26.7 -2.2 34.1 21st 13.8 -0.3 7.0 10th 52.8 3.3 v high 1600%
Carnegie 23.3 -0.5 35.0 31st 6.6 -0.5 0.6 10th 7.2 7.6 high 95%
Giles Meteorological Office 21.2 -1.4 28.0 31st 8.1 -0.6 2.3 11th 18.6 10.6 high 175%
Telfer Aero 27.1 -1.2 34.5 31st 13.1 +0.6 7.0 11th 0 5.7 lowest 0%
Warburton Airfield 22.3 -0.7 32.2 31st 7.9 +0.8 0.3 10th 1.2 10.2 average 12%
Wiluna 22.4 +0.6 31.0 30th 6.6 -0.2     8.0 10.1 average 79%

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 Wednesday 1 September 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 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.

Further information

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