Western Australia in July 2010: Wet in the north but dry in the west

  • Above average rainfall for WA, but below average for the southwest
  • Near average mean maximum temperature for WA
  • Above average mean minimum temperature for WA, but well below average for the southwest

Rainfall

In July 2010, most of the Kimberley, adjacent parts of the Pilbara, Interior, Goldfields and Eucla registered above to very much above average rainfall. During the first two weeks of July, rainfall occurred in these regions, with some heavy daily falls above 50 mm. In the Kimberley, a number of sites registered their highest daily rainfall on record for July. Derby Main Roads reported 108.6 mm in the 24 hours to 9 am on the 10th, the highest daily rainfall in WA for July 2010. Consequently, several sites in the Kimberley, including Broome Airport, recorded their wettest July on record.

In contrast, western parts of WA, from the western Pilbara, the Gascoyne, and Southwest Land Division (SWLD) saw mostly below to very much below average rainfall in July. A strong cold front brought the first significant rainfall of the month to most of the southern half of the state on the 8th, with daily totals generally ranging from 20 mm to 50 mm in western parts of the SWLD in the 24 hours to 9 am on the 9th, and a few sites in the northern SWLD and southern Gascoyne registered their highest daily rainfall on record for July. Two additional cold fronts and a slow moving low brought more rainfall later in the month to the southern half of the state, however dry spells in the first and third week of the month in much of the SWLD resulted in a generally below average month for western parts of the state, and several sites in the SWLD recorded their lowest July rainfall on record.

The wet conditions in the north and dry conditions in the west culminated in the state mean for July 2010 being near average (see July rainfall totals & decile maps).

Maximum temperature

Close to normal mean maximum temperatures were reported across most of WA during July. Above average mean maximum temperatures were mainly confined to the north and west Kimberley, the west Pilbara, and west coast parts of WA. Areas of the west Pilbara and north and west Kimberley saw mean maxima up to 2 °C above normal. Conversely, parts of the northeast Interior were below average, with up to 3 °C below normal mean maxima. When averaged over the whole state, July 2010 was near average(see July maximum temperature decile & anomaly maps).

A lack of cool air from the south caused daytime and overnight temperatures in the northern half of the state to be well above average in the last few days of July. A number of sites in the Pilbara recorded their highest daytime temperature on record.

Minimum temperature

Above to very much above average mean minimum temperatures were recorded in the the northern half of the state in July, with mean minima in the central Kimberley up to 6 °C above average. A few sites in the Kimberley and east Pilbara, including Broome Airport, recorded their hottest July in terms of overnight minimum temperatures. Some unusually warm nights for July were recorded in the Pilbara in the last week of the month and a few sites recorded their hottest July night on record.

A large area in the southern half of the state saw below to very much below average mean minima in July, with up to 3 °C below normal mean minima in the Central West and neighbouring districts. Clear conditions early in the month in southern parts saw a run of cold nights continue from June. Several sites in the SWLD recorded their lowest July temperatures on record on the 3rd and 4th, whilst a minimum temperature of -0.4 °C at Geraldton Airport on the 4th was its first ever sub-zero temperature in its 68 years of record. As a result of this and other clear dry spells during the month, several sites in the SWLD, and Eyre in the Eucla, experienced their coldest July on record in terms of mean minimum temperature.

When averaged over the whole state, July 2010 was above average for mean minimum temperature due to the conditions in the north, despite southwest WA (southwest of a line from Jurien to Bremer Bay) being well below average (see July minimum temperature decile & anomaly maps).

 

Further information

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Extremes in July 2010
Hottest day 37.3 °C at Wyndham Aero on the 31st
Warmest days on average 32.8 °C at Wyndham Aero
Coolest days on average 14.5 °C at Rocky Gully
Coldest day 9.2 °C at Rocky Gully on the 12th
Coldest night -5.2 °C at Eyre on the 5th
Coolest nights on average 1.5 °C at York
Warmest nights on average 24.3 °C at Troughton Island
Warmest night 25.7 °C at Troughton Island on the 25th
Wettest overall 227.2 mm at Witchcliffe
Wettest day 108.6 mm at Derby Main Roads on the 10th
Highest wind gust 113 km/h at North Island on the 9th

Record highest July daily rainfall
Highest daily rainfall
in July 2010 (mm)
Previous highest
for July
Years of
record
Yeeda 65.0 on the 6th 64.8 on the 14th in 1956 108
Trayning 34.0 on the 9th 31.8 on the 5th in 1963 96
Paynes Find 30.8 on the 9th 29.0 on the 10th in 2009 49
Badgingarra Research Stn 60.8 on the 9th 60.2 on the 4th in 1985 47
Rawlinna Homestead 16.4 on the 9th 14.8 on the 4th in 1997 47
Country Downs 74.4 on the 6th 56.0 on the 7th in 1978 39
Dampier Downs 77.0 on the 10th 62.4 on the 6th in 1978 36
Nita Downs 41.0 on the 5th 35.6 on the 7th in 1978 31



Record highest total July rainfall
Total rainfall
for July 2010 (mm)
Previous highest
for July
Years of
record
Average for
July
Broome Airport 106.8 101.4 in 2001 70 7.3
Balgo Hills 75.6 66.9 in 1957 63 8.8
Derby Aero 153.0 80.0 in 1978 56 7.9
Country Downs 142.2 65.6 in 1978 39 8.2
Dampier Downs 141.2 69.0 in 1978 36 8.2
Nita Downs 97.0 44.6 in 1978 31 6.8




Record lowest total July rainfall
Total rainfall
for July 2010 (mm)
Previous lowest
for July
Years of
record
Average for
July
Gingin 39.0 40.9 in 1937 120 147.9
Codg Codgen 3.8 8.1 in 1957 108 50.0
Rushy Pool 7.0 13.8 in 1957 99 67.8
Doodlakine 4.0 8.4 in 2005 98 47.0
Cuballing 15.4 26.4 in 1998 97 89.7
Bolgart 9.4 23.5 in 1957 94 86.7
Bungulla 1.2 7.7 in 2005 82 48.6
Warra Jarra 22.8 26.4 in 1994 32 58.0




Record highest July temperature
Highest temperature
in July 2010 (°C)
Previous highest
for July
Years of
record
Average for
July
Roebourne 34.8 on the 27th 33.9 on the 7th in 2009 53 26.7
Mandora 35.8 on the 27th 35.7 on the 31st in 1992 49 28.9



Record lowest July daily maximum temperature
Lowest daily maximum
temperature
in July 2010 (°C)
Previous lowest
for July
Years of
record
Average for
July
Badgingarra Research Stn 11.4 on the 9th 11.7 on the 29th in 1975 44 17.6
Telfer Aero 13.1 on the 5th 13.6 on the 9th in 1986 37 25.3



Record highest July daily minimum temperature
Highest daily minimum
temperature
in July 2010 (°C)
Previous highest
for July
Years of
record
Average for
July
Port Hedland Airport 22.7 on the 30th 22.4 on the 16th in 1996 63 12.3
Wittenoom 20.9 on the 28th 20.6 on the 12th in 1995 58 11.5
Telfer Aero 21.5 on the 29th 20.9 on the 31st in 2007 37 10.5



Record lowest July temperature
Lowest temperature
in July 2010 (°C)
Previous lowest
for July
Years of
record
Average for
July
Geraldton Airport -0.4 on the 4th 0.8 on the 27th in 1990 68 9.5
Perth Airport -1.0 on the 3rd -0.8 on the 22nd in 2006 67 8.1
Pearce RAAF -1.9 on the 4th -1.0 on the 22nd in 2006 53 8.5
Badgingarra Research Stn 1.3 on the 4th 1.7 on the 21st in 1987 43 7.3
Narembeen -3.2 on the 3rd -2.5 on the 2nd in 1982 40 5.5
Pingelly -2.5 on the 3rd -1.6 on the 12th in 2005 39 5.6



Record highest July mean daily minimum temperature
Mean daily minimum
temperature
for July 2010 (°C)
Previous highest
for July
Years of
record
Average for
July
Broome Airport 18.2 17.6 in 1973 70 13.6
Bidyadanga 17.8 17.4 in 1973 51 13.8
Warmun 17.4 16.9 in 1998 48 12.5
Telfer Aero 13.3 12.7 in 1975 36 10.5




Record lowest July mean daily minimum temperature
Mean daily minimum
temperature
for July 2010 (°C)
Previous lowest
for July
Years of
record
Average for
July
Lake Grace Comparison 3.6 3.7 in 1969 54 5.6
Eyre 2.5 3.5 in 2005 52 5.9
Pearce RAAF 5.5 6.5 in 1997 49 8.5
Merredin 3.4 3.8 in 1989 44 5.6
Wongan Hills 4.8 4.9 in 1997 43 6.6
Badgingarra Research Stn 5.5 5.8 in 1986 42 7.3
Brookton 2.1 2.5 in 1997 42 4.6
Jurien Bay 7.0 7.5 in 2006 40 9.5
Pingelly 3.2 4.0 in 1997 38 5.6
Eneabba 6.9 7.2 in 2006 36 9.1



Summary statistics for July 2010
Maximum temperatures
for July
(°C)
Minimum temperatures
for July
(°C)
Rainfall
for July
(millimetres)
Mean for
July
2010
Diff
from
average
Highest for
July
2010
Mean for
July
2010
Diff
from
average
Lowest for
July
2010
Total for
July
2010
Average
for
July
Rank of
July
2010
Fraction of
July
average
North Kimberley (district 01)
Kalumburu 32.2 +0.2 35.3 31st 18.8 +5.5 12.7 18th 0 0.4 v low 0%
Kuri Bay 31.0 -0.1 34.7 26th     16.0 23rd 3.4 4.8 high 71%
Mount Elizabeth 29.1 +0.6 33.5 30th 12.7 +4.8 5.4 23rd 7.2 3.3 high 218%
Troughton Island 29.5 +1.4 30.9 26th 24.3 +2.2 22.0 2nd 0.4 3.0 high 13%
Truscott 31.1   33.4 27th 21.5   18.1 17th 0
Wyndham 32.3 +1.1 36.6 31st 20.1 +3.2 15.2 22nd 0 3.3 lowest 0%
Wyndham Aero 32.8   37.3 31st 19.7   14.0 22nd 0 3.3 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 30.2 +0.5 35.2 30th 18.5 +3.0 13.4 22nd 1.4 1.5 high 93%
Halls Creek Airport 26.5 -0.7 32.8 29th 15.6 +3.1 10.1 2nd 64.0 6.2 v high 1032%
Kununurra Aero 31.1 +0.6 35.6 28th 18.5 +3.4 14.3 22nd 1.4 1.7 high 82%
Warmun     36.0 30th 17.4 +4.9 12.5 22nd 2.2 5.5 high 40%
West Kimberley (district 03)
Bidyadanga 30.2 +0.8 35.5 27th 17.8 +4.0 14.6 2nd 80.8 8.5 v high 951%
Broome Airport 28.9 +0.1 33.2 25th 18.2 +4.6 14.9 2nd 106.8 7.3 highest 1463%
Curtin Aero 30.2 -0.8 35.8 27th 18.8 +3.6 13.8 2nd 110.2 8.9 v high 1238%
Derby Aero 29.9 -0.8 34.5 27th 18.3 +3.6 14.6 2nd 153.0 7.9 highest 1937%
Fitzroy Crossing Aero 30.0 -0.9 35.0 29th 16.6 +4.8 10.7 23rd 67.8 7.7 v high 881%
West Roebuck 30.3 -0.6 35.0 27th 17.1 +5.1 13.0 24th 119.8 23.2 high 516%
De Grey (district 04)
Bedout Island 25.3   28.0 29th 20.2   16.0 5th
Karratha Aero 26.9 +0.7 32.4 27th 16.4 +2.8 10.6 11th 5.0 14.8 average 34%
Legendre Island 24.9   31.0 17th 18.8   15.0 5th
Mandora 28.8 -0.1 35.8 27th 16.8 +4.4 11.0 24th 73.6 9.0 v high 818%
Marble Bar 26.3   33.6 27th 14.8   10.3 11th 57.8 22.9 high 252%
Pardoo Station 28.2 +0.3 34.4 28th 16.8 +4.0 12.0 2nd 46.3 9.8 v high 472%
Port Hedland Airport 27.6 +0.5 34.1 28th 16.1 +3.8 11.7 2nd 53.2 11.2 v high 475%
Roebourne 28.5 +1.8 34.8 27th 16.2 +2.6 11.1 10th 8.1 13.9 average 58%
Roebourne Aero 28.2   34.7 28th 15.5   9.4 11th 5.4 11.8 high 46%
Fortescue (district 05)
Barrow Island Airport 23.7 -0.1 25.7 31st 18.4 +0.8 14.7 14th 9.0 13.2 average 68%
Learmonth Airport 24.6 +0.4 28.0 27th 11.8 +0.4 6.1 25th 0 22.7 lowest 0%
Mardie 28.3 +0.6 32.5 27th 14.3 +2.6 8.4 11th 2.2 13.3 average 17%
Onslow 26.7 +1.9 31.6 27th 14.9 +3.2 10.6 11th 0 18.5 lowest 0%
Onslow Airport 26.9 +1.7 30.6 27th 14.5 +1.7 10.3 11th 0.6 19.6 v low 3%
Tom Price 22.8 -0.2 29.3 28th 8.6 +1.5 4.0 15th 3.6 16.8 average 21%
Wittenoom 24.7 +0.5 31.4 28th 13.2 +1.7 6.3 14th 11.0 14.3 average 77%
West Gascoyne (district 06)
Carnarvon Airport 22.9 +0.6 27.6 22nd 9.2 -1.8 4.5 2nd 5.6 45.6 low 12%
Emu Creek Station 25.7 +0.3 30.5 16th 12.3 +1.1 7.5 10th 1.0 22.2 low 5%
Gascoyne Junction 23.1 +0.1 27.7 16th 8.9 -0.4 3.7 7th 0.7 27.5 low 3%
Shark Bay Airport 22.5 -0.3 26.2 22nd 9.4 -1.2 2.8 7th 2.8 29.0 v low 10%
East Gascoyne (district 07)
Newman Aero 22.7 -0.3 31.4 27th 7.7 +1.8 0.9 2nd 5.0 14.9 average 34%
Paraburdoo Aero 24.5 -0.3 30.7 16th 10.9 +1.3 4.5 25th 4.2 14.9 average 28%
Murchison (district 07A)
Meekatharra Airport 18.9 -0.1 24.8 16th 6.0 -1.4 2.4 2nd 5.0 21.7 low 23%
Mount Magnet Aero 18.0 -0.7 23.7 16th 5.4 -1.6 1.3 1st 16.2 30.7 average 53%
North Coast (district 08)
Carnamah 18.1 +0.2 21.5 7th 5.5 -1.8 0.2 5th 48.5 68.1 average 71%
Dalwallinu 16.8 -0.1 21.3 25th 4.2 -1.7 -0.2 4th 43.2 47.1 average 92%
Dalwallinu Comparison 17.2 +0.2 21.6 25th 4.6 -2.0 0.5 2nd 44.7 60.0 low 75%
Eneabba     23.1 25th 6.9 -2.2 1.1 5th 83.2 95.3 average 87%
Geraldton Airport 19.3 -0.2 23.1 7th 6.8 -2.7 -0.4 4th 81.6 92.5 average 88%
Kalbarri 21.7 0.0 25.5 7th 7.9 -1.8 1.8 2nd 40.8 72.2 low 57%
Morawa Airport 18.4 -0.2 23.0 25th 3.6 -2.6 -0.7 4th 37.0 44.9 average 82%
Mullewa 19.2 +0.5 23.6 25th 5.9 -1.1 1.9 2nd 37.3 60.4 low 62%
North Island 20.8   23.8 8th 14.9   11.0 9th 39.8
Wongan Hills 17.2 +0.2 22.0 25th 4.8 -1.8 -0.7 6th 50.8 69.7 average 73%
Central Coast (district 09)
Badgingarra Research Stn 17.1 -0.5 21.0 25th 5.5 -1.8 1.3 4th 88.2 106.3 average 83%
Bickley 15.0 0.0 19.8 25th 6.7 -0.4 3.0 3rd 175.6 220.7 low 80%
Champion Lakes 17.4   21.8 25th 7.7   2.7 4th 111.6
Garden Island HSF 17.4   19.8 25th 10.1   6.2 5th 84.2
Gingin Aero 18.0 -0.3 23.1 25th 3.2 -3.2 -3.7 5th 96.2 127.7 low 75%
Gooseberry Hill 16.2 -0.2 21.2 25th 8.6 -0.6 5.5 3rd
Gosnells City 18.5 -0.1 23.6 25th 6.6 -2.3 1.1 4th 140.7 165.1 low 85%
Jandakot Aero 18.1 +0.3 22.3 25th 4.3 -2.6 -1.9 3rd 106.8 178.2 low 60%
Jurien Bay 19.7 +0.3 22.8 15th 7.0 -2.5 1.6 5th 67.6 114.4 low 59%
Karnet 15.4 0.0 20.0 25th 4.7 -1.6 0.5 5th 156.2 222.4 low 70%
Lancelin 19.4 +0.3 22.7 16th     4.0 6th 55.0 122.9 v low 45%
Medina Research Centre 18.4 +0.2 22.0 25th 6.4 -2.0 0.2 3rd 123.0 151.2 average 81%
Pearce RAAF 17.9 +0.1 22.5 25th 5.5 -3.0 -1.9 4th 112.4 137.3 low 82%
Perth Airport 18.4 +0.5 23.1 25th 5.8 -2.3 -1.0 3rd 133.2 158.9 low 84%
Perth Metro 18.2 -0.1 22.7 25th 5.9 -2.1 0.0 3rd 142.0 170.0 average 83%
Rottnest Island 17.3 -0.4 19.7 25th 11.7 -0.6 7.9 10th 88.2 113.4 average 78%
Swanbourne 18.2 -0.1 21.0 25th 8.3 -1.4 4.0 5th 148.0 151.3 average 98%
South Coast (district 09A)
Albany 16.6 +0.9 20.8 25th 8.3 +0.2 5.6 13th 159.0 144.0 average 110%
Albany Airport 16.0 +0.2 19.8 25th 6.6 -0.9 2.2 24th 133.8 120.7 average 111%
Bridgetown 15.8 +0.1 19.2 25th 3.1 -1.3 -1.0 24th 88.4 123.1 low 72%
Bridgetown Comparison 16.6 +0.8 20.8 25th 3.0 -1.4 -1.0 25th 89.5 146.8 v low 61%
Bunbury 17.3 +0.1 19.8 25th 5.3 -1.9 -0.3 3rd 135.0 150.2 average 90%
Busselton 16.9 -0.2 19.4 15th 6.9 -1.2 1.5 3rd
Busselton Aero 16.5 -0.2 19.2 23rd 5.2 -1.7 0.0 3rd 138.6 138.3 average 100%
Cape Leeuwin 16.9 +0.6 19.9 23rd 11.6 +0.3 9.1 21st 141.6 182.4 low 78%
Cape Naturaliste 16.9 +0.6 20.3 25th 10.2 -0.2 6.4 3rd 120.8 162.7 low 74%
Collie East 16.8   20.5 25th 2.3   -2.1 3rd 111.2
Donnybrook 17.2 +0.7 21.0 25th 4.6 -1.1 0.0 3rd 141.1 187.5 low 75%
Dwellingup 15.5 +0.5 19.2 25th 3.5 -2.0 -1.6 3rd 177.8 240.1 low 74%
Esperance 17.4 +0.3 22.9 26th 7.7 -0.6 5.0 3rd 97.6 96.8 average 101%
Esperance Aero 15.8 -0.5 20.6 26th 7.0 -0.6 3.5 3rd 67.6 79.4 average 85%
Harvey 16.8   19.5 25th 6.0   2.0 3rd 167.2 158.6 average 105%
Hopetoun North 17.7 -0.5 23.8 26th 7.2 -0.5 3.5 8th 51.8 65.3 average 79%
Jarrahwood 16.5 +0.2 19.9 25th 3.5 -1.4 -1.5 21st 128.1 178.3 low 72%
Mandurah 17.1   19.9 23rd 9.4   5.4 5th 121.2
Manjimup 15.0 +0.7 19.1 25th 5.8 -0.6 2.0 3rd 120.8 175.6 low 69%
North Walpole 16.0   19.8 25th 8.4   4.5 3rd 165.2
Pemberton 15.8 +0.8 19.5 25th 6.9 -0.3 3.0 3rd 155.6 211.4 low 74%
Rocky Gully 14.5 -0.2 18.9 25th 5.8 -0.7 1.8 3rd 92.0 95.9 average 96%
Shannon 14.8 -0.1 19.0 25th 6.2 -0.2 2.4 3rd 140.8 163.9 average 86%
Windy Harbour 17.1 +0.4 20.2 25th 9.0 +0.4 5.0 1st 162.4 191.3 average 85%
Witchcliffe 16.5 +0.1 19.9 25th 7.0 -1.2 1.6 21st 227.2 186.9 high 122%
North Central (district 10)
Bencubbin 16.7 +0.3 21.2 25th 4.9 -1.1 -0.4 1st 23.4 45.5 low 51%
Cunderdin Airfield 16.9 0.0 21.7 25th 2.4 -2.3 -3.7 5th 40.8 51.1 average 80%
Merredin 16.3 +0.1 21.2 25th 3.4 -2.2 -2.5 4th 51.0 51.0 average 100%
Northam 17.1 +0.2 21.4 25th 2.7 -2.7 -3.1 7th 68.0 82.8 average 82%
York 17.0 +0.1 21.0 25th 1.5 -2.3 -4.2 7th 60.3 72.0 average 84%
South Central (district 10A)
Beverley 16.9 +0.1 20.6 25th 2.6 -2.6 -2.4 3rd 51.4 77.8 low 66%
Brookton 15.7 -0.4 19.5 25th 2.1 -2.5 -2.7 3rd 47.5 85.4 low 56%
Corrigin 15.5 +0.2 20.4 25th 2.3 -2.6 -2.9 7th 30.4 59.6 low 51%
Hyden 16.9 +0.6 22.0 25th 2.6 -2.1 -4.0 3rd 34.5 47.7 average 72%
Jacup 15.8 +0.2 19.9 8th 4.5 -1.1 0.9 3rd 34.4 50.5 low 68%
Katanning 14.7 0.0 18.7 25th 5.0 -1.0 1.4 21st 43.0 66.5 v low 65%
Katanning Comparison 15.3 +0.7 19.4 25th 4.2 -1.2 -1.0 23rd 51.4 75.7 low 68%
Lake Grace 15.3 -0.3 19.5 25th 3.2 -2.1 -1.0 3rd 32.6 37.4 average 87%
Lake Grace Comparison 15.4 0.0 19.5 25th 3.6 -2.0 -0.5 3rd 27.8 47.5 low 59%
Narembeen 16.2 -0.3 21.0 25th 3.6 -1.9 -3.2 3rd 36.7 49.9 average 74%
Narrogin 14.8 +0.3 19.0 25th 3.1 -2.2 -1.3 3rd 52.2 87.7 low 60%
Newdegate Research Station 15.0 -0.2 19.8 8th 2.9 -1.2 -1.0 6th 0 47.9 lowest 0%
Ongerup 15.3 +0.4 18.8 25th 4.3 -1.5 0.1 5th 55.6 49.9 average 111%
Pingelly 15.5 +0.2 19.4 25th 3.2 -2.4 -2.5 3rd 41.8 82.1 low 51%
Ravensthorpe 16.0 -0.3 20.2 26th 5.9 -0.8 2.1 3rd 40.2 46.8 average 86%
Wagin 15.5 +0.2 19.0 25th 3.7 -1.9 -0.4 24th 47.2 71.4 low 66%
Wandering 15.6 -0.2 20.2 25th 1.9 -2.2 -2.8 3rd 77.8 97.8 v low 80%
Eucla (district 11)
Balladonia 17.5 -0.1 22.5 27th 4.1 -0.7 -0.6 6th 19.7 20.3 average 97%
Eucla 17.7 -0.3 22.5 17th 6.2 -0.8 1.8 5th 44.4 25.1 high 177%
Eyre 18.5 +0.4 22.3 16th 2.5 -3.4 -5.2 5th 26.9 34.4 average 78%
Forrest 17.5 -1.2 22.6 28th 4.3 -0.8 0.5 7th 22.8 17.9 average 127%
Red Rocks Point 17.5   21.6 16th 6.2   2.6 11th 39.4
South East (district 12)
Bulga Downs 19.3   25.2 16th 3.7   -1.7 2nd 11.4 23.4 average 49%
Kalgoorlie-Boulder Airport 16.8 +0.1 21.9 16th 4.6 -0.4 -0.4 4th 12.6 24.8 low 51%
Laverton Aero 17.3 -1.1 23.3 26th 4.9 -1.0 -0.3 4th 24.4 17.1 high 143%
Leinster Aero 17.7 -1.0 24.0 16th 4.7 -1.5 -0.5 2nd 19.0 19.5 average 97%
Leonora 17.9 -0.6 23.8 16th 5.1 -1.0 0.9 2nd 20.2 18.8 average 107%
Leonora Aero 17.9   23.9 16th 4.6   -0.9 2nd 17.6
Munglinup West 16.1   22.7 26th 5.9   2.0 3rd 23.8
Norseman 17.4 +0.7 22.5 26th 3.3 -1.9 -1.0 1st 17.2 26.9 average 64%
Norseman Aero 16.7 -0.7 21.8 16th 2.7 -1.5 -2.4 1st 13.6 20.8 average 65%
Southern Cross Airfield 16.3 -0.3 21.6 26th 2.0 -1.3 -3.3 4th 26.2 35.7 low 73%
North East (district 13)
Balgo Hills 24.4 -2.1 32.2 28th 14.0 +1.7 9.3 2nd 75.6 8.8 highest 859%
Carnegie 20.6 -0.7 28.0 27th 5.4 -0.4 -1.2 2nd 3.5 11.8 average 30%
Giles Meteorological Office 19.1 -0.9 27.2 29th 7.8 +0.9 2.3 14th 25.4 11.7 high 217%
Telfer Aero 24.8 -0.5 32.9 28th 13.3 +2.8 7.8 2nd 66.4 13.5 v high 492%
Warburton Airfield 19.9 -0.8 28.0 28th 6.8 +1.1 0.1 14th 14.4 13.1 high 110%
Wiluna 18.9 -0.5 25.2 27th 3.8 -1.6 -0.5 2nd 14.1 15.1 average 93%

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 9 am on Monday 2 August 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.

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

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