Western Australia in September 2010: Very dry in Southwest WA

  • 3rd wettest September for WA but 4th driest for Southwest WA
  • 5th lowest mean maximum temperature for WA
  • 4th lowest mean minimum temperature for Southwest WA

Rainfall

Following one of the driest winters on record, September 2010 saw a continuation of below to very much below average rainfall in Southwest WA (SWWA; southwest of a line from Jurien Bay to Bremer Bay), with many sites recording their lowest September rainfall on record and a host of others observing their driest September in at least 30 years (see tables below). A strong cold front that crossed the Southwest Land Division (SWLD) on 31 August 2010, brought moderate to heavy rainfall to the Goldfields and Central Wheat Belt in the 24 hours to 9am on 1 September 2010, with several stations breaking their daily September records. The same frontal system brought heavy rainfall to the Eucla, with the 57.6 mm in the 24 hours to 9am on the 3rd breaking the September record. Aside from this cold front, and a few other weaker fronts during the first half of the month, a strong ridge dominated the weather over SWWA, resulting in the fourth driest September on record (comparable records began in 1900).

In contrast, much of northern, central and eastern WA registered above to very much above average rainfall in September 2010, with sites in the Pilbara, Interior and Eucla recording their wettest September on record. Thunderstorm activity in the Kimberley overnight on the 6th saw Moola Bulla record 50.0 mm in the 24 hours to 9am on the 7th, which is their wettest September day in 96 years of record, while cloudbands during the middle of the month saw sites in the Pilbara also break their highest daily September records.

When averaged across the state as a whole, rainfall for Spetember 2010 ranked as the third wettest on record (see September rainfall totals & decile maps).

2010 has been an extremely dry year in SWWA. Very much below average rainfall during summer (2009/10); below average rainfall in autumn; the driest winter on record; and very much below average September rainfall has culminated in the lowest January to September rainfall on record for SWWA. For further information about longer term rainfall deficits in SWWA, please refer to the Special Climate Statement 22.

Maximum temperature

Mean maximum temperatures were above to very much above average in the northern and western Kimberley, western Gascoyne and western parts of the SWLD. In contrast, much of the remainder of the state experienced below to very much below average daytime temperatures, with an area of 4 to 6 °C below normal in central and eastern parts (see September maximum temperature decile & anomaly maps). When averaged over the whole state, September 2010 was the fifth coldest September on record in terms of mean maximum temperature (comparable records began in 1950).

A cloudband over the Pilbara caused record low daily maximum temperatures at several sites on the 15th; while regular thunderstorm activity and cloudbands through the Interior resulted in Warburton and Balgo Hills experiencing their coldest September on record in terms of mean maximum temperature.

A persistent ridge of high pressure over southern WA throughout much of September 2010 resulted in several sites in the SWLD breaking their highest mean monthly maximum temperature records; while a warm end to the month was experienced in the Pilbara, western Gascoyne and western parts of the SWLD with several highest daily September records broken.

Despite below average maximum temperatures over much of the state in September 2010, WA has experienced its second hottest January to September on record in terms of mean maximum temperature.

Minimum temperature

Mean minimum temperatures were above to very much above average over much of the Kimberley, northern and western Pilbara, inland Gascoyne and eastern Eucla. In contrast, below to very much below average overnight temperatures occurred over central parts of the state, the SWLD, southern Goldfields and western Eucla (see Spetember minimum temperature decile & anomaly maps).

The persistent ridge over southern WA during much of September 2010 resulted in many clear and cooler than average nights, with stations in southern parts of the SWLD observing their coldest September on record in terms of minimum temperature. In contrast to the cooler than normal trend for much of the month in southern WA, a warm day on the 29th combined with middle level cloud over western parts of WA resulting in a number of locations observing their warmest September night on record.

Minimum temperatures were very much above normal in the Kimberley, with several sites in the west Kimberley experiencing their warmest September on record. Wyndham observed a minimum temperature of 29.4°C on the 25th, which is the second highest overnight temperature on record for September for all of WA behind the 29.7 °C recorded on 25 September 2005, also at Wyndham.

When averaged over the whole state, mean minimum temperatures in September 2010 were below average; however, SWWA (southwest of a line Jurien Bay to Bremer Bay) was very much below average and ranked as the fourth coldest on record in terms of mean minimum temperature (comparable records began in 1950).

Further information

Media
(03) 9669 4057
Enquiries

Extremes in September 2010
Hottest day 42.7 °C at West Roebuck on the 28th
Warmest days on average 37.8 °C at Wyndham Aero
Coolest days on average 17.2 °C at Albany
Coldest day 10.9 °C at Kalgoorlie-Boulder Airport on the 1st
Coldest night -3.2 °C at Eyre on the 11th
Coolest nights on average 2.2 °C at Newdegate Research Station
Warmest nights on average 26.4 °C at Troughton Island
25.2 °C at Wyndham (mainland)
Warmest night 29.4 °C at Wyndham on the 25th
Wettest overall 148.4 mm at Eucla
Wettest day 68.2 mm at Old Mornington Homestead on the 8th
Highest wind gust 104 km/h at Cape Leeuwin on the 8th

Record highest September daily rainfall
Highest daily rainfall
in September 2010 (mm)
Previous highest
for September
Years of
record
Yarrie 20.0 on the 15th 9.4 on the 7th in 1920 105
Yundamindra 36.0 on the 1st 31.5 on the 12th in 1960 104
Warrawagine 26.0 on the 15th 25.4 on the 30th in 1937 99
Edjudina 35.5 on the 1st 35.0 on the 28th in 1984 98
Eucla 57.6 on the 3rd 39.9 on the 23rd in 1962 97
Dalwallinu Comparison 36.4 on the 1st 27.9 on the 8th in 1973 96
Moola Bulla 50.0 on the 7th 49.3 on the 8th in 1920 96
Munarra 23.6 on the 1st 22.8 on the 28th in 1984 84
Yeelirrie 33.7 on the 1st 33.0 on the 28th in 1984 83
Xantippe 30.8 on the 1st 21.3 on the 10th in 1925 69
Meekatharra Airport 24.0 on the 1st 21.4 on the 28th in 1984 65
Marillana 38.7 on the 12th 35.0 on the 9th in 2006 60
Wittenoom 41.0 on the 12th 19.2 on the 30th in 1986 60
Pyramid Station 13.8 on the 15th 11.4 on the 6th in 1997 53
Karratha Aero 15.4 on the 15th 10.0 on the 12th in 1986 37
Telfer Aero 15.8 on the 15th 15.4 on the 21st in 1982 37
Paraburdoo Aero 22.2 on the 11th 12.0 on the 6th in 1997 35
Newman Aero 26.4 on the 12th 24.8 on the 9th in 2006 34



Record highest total September rainfall
Total rainfall
for September 2010 (mm)
Previous highest
for September
Years of
record
Average for
September
Eucla 148.4 84.6 in 1899 129 22.5
Warrawagine 29.6 28.7 in 1937 100 1.5
Marillana 54.7 43.8 in 2006 62 3.4
Wittenoom 61.2 28.6 in 1986 61 3.5
Carnegie 28.3 25.2 in 1982 55 4.1
Giles Meteorological Office 62.4 61.4 in 2003 55 11.4
Pyramid Station 13.8 11.4 in 1997 53 0.8
Warburton Airfield 57.8 38.0 in 2004 50 5.9
Karratha Aero 20.8 11.2 in 1986 37 1.5
Newman Aero 44.6 35.6 in 2006 34 4.6

Highest total September rainfall for at least 30 years
Total rainfall
for September 2010 (mm)
Most recent September
this high or higher
Years since
higher
Average for
September
Mardie 11.2 63.5 in 1920 90 1.4
Roebourne 27.2 40.2 in 1920 89 1.4
Hamersley 38.8 42.9 in 1920 87 2.2
Mount Florance 33.0 74.7 in 1920 87 1.7
Millstream 33.1 54.4 in 1920 81 2.0
Coolawanyah 23.0 28.4 in 1933 77 1.3
Yarrie 20.0 37.8 in 1937 69 1.2
Onslow 12.4 24.7 in 1970 37 1.3
Broome Airport 4.6 24.4 in 1974 36 1.4
Halls Creek Airport 34.8 84.8 in 1974 36 4.8
Jubilee Downs 24.0 55.6 in 1974 35 1.6
Margaret River Station 22.2 37.1 in 1975 35 2.3
Moola Bulla 63.0 86.8 in 1974 35 5.5
Dampier Downs 25.0 69.0 in 1974 34 4.1
Edjudina 50.0 51.3 in 1974 34 9.7
Fossil Downs 3.0 9.5 in 1975 34 1.4
Mount Barnett 26.8 34.1 in 1917 34 4.1
Derby Aero 16.6 40.4 in 1974 31 1.1
Yalleen 14.0 44.0 in 1970 31 1.7



Record lowest total September rainfall
Total rainfall
for September 2010 (mm)
Previous lowest
for September
Years of
record
Average for
September
Geraldton Airport 4.8 6.0 in 1977 69 32.1
Cranham 12.2 18.3 in 1967 57 49.4
Newdegate Research Station 4.6 6.8 in 2000 56 34.0
Lancelin 8.0 13.3 in 1969 45 56.4
Mordetta 3.8 8.6 in 2002 39 29.6
Ferguson Valley 20.2 33.0 in 2004 37 98.3
Jarrahwood 27.4 48.9 in 2006 36 102.2
Paynedale 24.8 32.4 in 2004 33 95.6
Pickering Brook 39.9 42.0 in 1977 33 115.9

Lowest total September rainfall for at least 30 years
Total rainfall
for September 2010 (mm)
Most recent September
this low or lower
Years since
lower
Average for
September
Cape Naturaliste 14.0 10.2 in 1916 94 76.2
Kendenup 19.4 2.8 in 1916 94 61.7
Lake Grace Comparison 4.4 2.6 in 1916 94 30.3
Narrogin 8.6 6.6 in 1916 94 46.2
Quairading 3.2 0.0 in 1916 94 28.2
Williams 7.5 4.6 in 1916 94 50.7
Broomehill 11.5 2.7 in 1916 93 46.1
Gnowangerup 8.0 2.1 in 1916 93 39.1
Kukerin 7.4 4.1 in 1916 92 36.1
Badgebup 8.4 1.9 in 1916 90 37.5
Rushy Pool 7.6 6.9 in 1937 72 34.1
Chamingup 13.2 8.4 in 1939 71 52.4
Kondinin 3.8 2.8 in 1939 71 28.0
Tambellup 14.4 11.0 in 1939 71 45.1
Brookton 10.2 8.6 in 1939 70 38.1
Colorado 4.2 0.0 in 1939 70 30.6
Margaret River 37.4 34.0 in 1939 70 103.8
Katanning Comparison 15.6 14.0 in 1940 69 46.4
Beverley 5.6 4.2 in 1946 64 36.0
Kulin 4.0 3.9 in 1954 56 28.5
Ongerup 9.8 9.3 in 1954 56 38.3
Corrigin 8.8 8.6 in 1957 53 29.7
Doongin Peak 3.8 1.8 in 1957 53 25.7
Tammin 5.2 3.8 in 1957 53 26.2
Gordon River 23.0 13.2 in 1961 48 56.9
Amery Acres 7.8 0.0 in 1939 47 26.2
Cowaramup 43.9 39.7 in 1967 43 111.1
Kokardine 5.6 3.9 in 1967 42 23.7
Bickley 33.4 9.7 in 1969 41 120.5
Bridgetown Comparison 29.9 26.9 in 1969 41 88.0
Dwellingup 39.8 11.6 in 1969 41 129.6
Forest Grove 45.2 33.9 in 1969 41 112.4
Marradong 21.4 18.1 in 1969 41 71.6
Newbicup 23.8 16.0 in 1969 41 60.5
Boscabel 16.2 13.5 in 1969 40 51.8
Cherry Tree 10.6 10.4 in 1969 40 43.7
Gosnells City 24.8 4.1 in 1969 40 80.5
Kojonup 14.6 14.1 in 1969 40 51.9
Karnet 37.8 15.8 in 1969 39 128.1
Pingelly 11.8 10.6 in 1972 38 40.4
Jarrahdale 40.6 8.6 in 1969 37 125.0
Wagin 13.0 9.5 in 1972 37 40.9
Nannup 42.2 36.6 in 1974 36 99.2
Perth Airport 28.2 27.9 in 1974 36 71.3
Kojonolokan Hills 11.2 10.9 in 1969 35 38.3
Konnongorring 8.2 3.6 in 1967 34 26.5
Paynes Find 0.6 0.0 in 1967 34 14.0
Avondale Farm 14.0 10.9 in 1977 33 34.4
Berkshire Valley 15.6 8.3 in 1977 33 35.5
Goomalling 6.0 3.5 in 1977 33 27.2
Happy Valley 7.6 2.0 in 1977 33 26.0
Lynton 7.6 4.8 in 1977 33 26.7
Mingenew 4.5 4.0 in 1977 33 32.2
Mundaring 46.6 42.2 in 1977 33 112.4
Nabawa 12.2 4.3 in 1977 33 35.9
Wongan Hills Res.Station 7.9 6.5 in 1977 33 26.8
Yandanooka 7.4 2.8 in 1977 33 32.4
Cowcowing 3.3 2.6 in 1977 32 21.9
Dandaragan West 15.8 12.4 in 1977 32 55.4
Eradu 5.8 0.6 in 1977 32 29.9
Jandakot Aero 32.4 31.8 in 1977 31 84.6
Sandsprings 10.0 2.9 in 1977 31 38.9
Swan View 32.4 28.8 in 1977 31 79.6
Willigulli North 12.8 4.6 in 1979 31 32.5
Wongan Hills 10.0 7.8 in 1979 31 29.1
Ardath 4.6 3.0 in 1980 30 24.5
Coolangatta 8.0 7.4 in 1980 30 23.6
Graham Rock 7.4 6.0 in 1980 30 28.0
Hyden 5.7 5.6 in 1980 30 27.6
Narembeen 7.2 4.4 in 1980 30 25.6



Record highest September temperature
Highest temperature
in September 2010 (°C)
Previous highest
for September
Years of
record
Average for
September
Geraldton Airport 36.1 on the 29th 35.5 on the 26th in 1961 69 22.0
Cape Naturaliste 27.3 on the 30th 24.7 on the 26th in 1961 54 17.3
Onslow Airport 39.8 on the 27th 39.1 on the 5th in 1944 45 30.0
Jurien Bay 34.2 on the 29th 32.8 on the 14th in 1987 41 21.1
Gascoyne Junction 39.6 on the 28th 38.4 on the 29th in 1990 39 28.3
Eneabba 34.7 on the 29th 34.5 on the 20th in 1994 37 22.8
Learmonth Airport 41.3 on the 28th 38.9 on the 27th in 1980 36 29.2



Record lowest September daily maximum temperature
Lowest daily maximum
temperature
in September 2010 (°C)
Previous lowest
for September
Years of
record
Average for
September
Port Hedland Airport 21.4 on the 15th 24.4 on the 1st in 1993 63 32.3
Meekatharra Airport 13.3 on the 2nd 13.7 on the 30th in 2009 61 25.6
Wittenoom 16.2 on the 14th 16.7 on the 16th in 1958 58 31.1
Telfer Aero 18.4 on the 15th 20.3 on the 22nd in 1974 37 32.8



Record highest September mean daily maximum temperature
Mean daily maximum
temperature
for September 2010 (°C)
Previous highest
for September
Years of
record
Average for
September
Cape Naturaliste 19.1 19.0 in 2006 106 17.3
Dwellingup 19.6 19.5 in 1987 72 17.2
Karnet 19.7 19.3 in 1994 43 17.4
Lancelin 22.9 22.4 in 1974 42 20.3
Jurien Bay 23.7 23.3 in 1974 40 21.1
Pingelly 20.2 19.6 in 2006 38 18.2



Record lowest September mean daily maximum temperature
Mean daily maximum
temperature
for September 2010 (°C)
Previous lowest
for September
Years of
record
Average for
September
Warburton Airfield 23.0 24.0 in 1978 36 27.9
Balgo Hills 30.2 31.1 in 1956 31 33.8



Record highest September daily minimum temperature
Highest daily minimum
temperature
in September 2010 (°C)
Previous highest
for September
Years of
record
Average for
September
Geraldton Airport 19.1 on the 30th 18.0 on the 15th in 1996 69 9.2
Perth Airport 19.2 on the 30th 17.2 on the 28th in 1998 67 8.9
Carnarvon Airport 20.8 on the 29th 20.5 on the 22nd in 1988 65 13.8
Wongan Hills Res.Station 16.5 on the 30th 16.1 on the 21st in 1954 59 7.3
Dalwallinu Comparison 16.4 on the 30th 15.6 on the 30th in 1967 55 7.8
Pearce RAAF 19.1 on the 30th 19.0 on the 20th in 1985 53 8.8
Bencubbin 17.5 on the 30th 16.1 on the 27th in 1980 52 7.1
Badgingarra Research Stn 17.3 on the 30th 17.2 on the 30th in 1967 44 7.5
Karnet 15.5 on the 30th 14.8 on the 29th in 1999 44 7.2
Wongan Hills 16.5 on the 30th 16.1 on the 29th in 1990 44 7.6
Beverley 15.2 on the 30th 14.9 on the 28th in 1998 41 5.8
Kalbarri 20.4 on the 30th 19.5 on the 11th in 1974 37 10.7
Goomalling 16.0 on the 30th 15.4 on the 20th in 1985 35 6.9
Troughton Island 27.7 on the 29th 27.6 on the 30th in 1998 32 24.5



Record highest September mean daily minimum temperature
Mean daily minimum
temperature
for September 2010 (°C)
Previous highest
for September
Years of
record
Average for
September
Bidyadanga 19.7 19.4 in 2008 49 17.5
Wyndham 25.2 25.1 in 1992 41 22.9
Troughton Island 26.4 26.2 in 2009 31 24.5



Record lowest September mean daily minimum temperature
Mean daily minimum
temperature
for September 2010 (°C)
Previous lowest
for September
Years of
record
Average for
September
Katanning Comparison 4.0 4.4 in 1969 115 6.4
Salmon Gums Res.Stn. 2.3 2.9 in 1956 71 5.8
Wagin 4.3 4.5 in 1975 35 6.2


Summary statistics for September 2010
Maximum temperatures
for September
(°C)
Minimum temperatures
for September
(°C)
Rainfall
for September
(millimetres)
Mean for
September
2010
Diff
from
average
Highest for
September
2010
Mean for
September
2010
Diff
from
average
Lowest for
September
2010
Total for
September
2010
Average
for
September
Rank of
September
2010
Fraction of
September
average
North Kimberley (district 01)
Kalumburu 36.0 +0.3 37.8 15th 21.6 +2.2 12.8 1st 0 2.1 v low 0%
Troughton Island 31.6 +1.4 33.3 22nd 26.4 +1.9 23.9 1st 0.2 0.2 high 100%
Truscott 34.2   36.5 23rd 23.9   19.8 2nd 0.2
Wyndham 37.0 +0.3 41.0 29th 25.2 +2.3 18.7 1st 3.6 4.2 high 86%
Wyndham Aero 37.8 +0.1 41.8 29th 24.6 +2.6 18.3 1st 0.4 4.4 high 9%
East Kimberley (district 02)
Argyle Aerodrome 35.5 -1.0 39.5 29th 23.4 +1.0 17.0 1st 1.8 2.8 average 64%
Halls Creek Airport 32.0 -2.1 37.2 28th 19.5 +0.5 12.8 20th 34.8 4.8 v high 725%
Kununurra Aero 36.5 -0.1 40.1 29th 22.5 +2.2 13.9 1st 0.8 3.3 average 24%
Warmun 35.0 -1.1 40.1 28th 22.2 +2.8 14.9 1st 31.6 4.6 v high 687%
West Kimberley (district 03)
Bidyadanga 33.8 +1.0 41.5 28th 19.7 +2.2 15.1 6th 9.2 1.3 v high 708%
Broome Airport 32.8 +1.1 40.5 28th 20.2 +1.7 16.7 6th 4.6 1.4 v high 329%
Curtin Aero 35.6 -0.9 41.9 30th 20.6 +2.1 15.6 3rd 1.8 0.2 v high 900%
Cygnet Bay 32.5 0.0 37.0 26th 20.9 +3.1 17.0 3rd 0.4 1.4 high 29%
Derby Aero 35.1 -0.1 41.5 29th 21.4 +1.8 17.2 19th 16.6 1.1 v high 1509%
Fitzroy Crossing Aero 36.0 -1.4 41.4 28th 19.9 +1.0 13.9 1st 3.0 0.4 v high 750%
West Roebuck 34.9 +0.8 42.7 28th 19.3 +2.0 14.5 5th 2.0 0.6 v high 333%
De Grey (district 04)
Bedout Island 27.7   33.0 28th 21.3   18.0 15th
Karratha Aero 29.5 -1.1 38.1 26th 17.5 +0.5 11.9 5th 20.8 1.5 highest 1387%
Legendre Island 26.5   36.0 26th 19.8   17.0 4th
Mandora 32.2 -1.5 41.0 28th     12.5 3rd        
Marble Bar 30.9 -3.9 40.7 30th 16.9 +0.2 10.6 4th 18.0 6.6 high 273%
Pardoo Station 31.4 -1.5 39.0 30th 17.5 +1.5 13.5 6th 23.3 2.9 v high 803%
Port Hedland Airport 31.0 -1.3 39.2 29th 17.3 +1.9 9.7 6th 9.4 1.3 v high 723%
Roebourne 31.3 -1.3 40.3 28th 17.2 +0.4 12.6 6th 27.2 1.4 v high 1943%
Roebourne Aero 30.7   40.2 28th 16.7   10.2 6th 28.4 3.7 v high 768%
Fortescue (district 05)
Barrow Island Airport 26.4 -0.4 32.4 29th 19.4 0.0 15.2 6th 8.2 0.9 v high 911%
Learmonth Airport 29.5 +0.3 41.3 28th 14.2 +0.4 8.9 4th 0 2.1 lowest 0%
Mardie 31.4 -0.9 39.3 26th 16.0 +1.7 10.3 3rd 11.2 1.4 v high 800%
Onslow 29.3 +0.2 38.9 29th 16.5 +2.3 13.4 3rd 12.4 1.3 v high 954%
Onslow Airport 30.1 +0.1 39.8 27th 16.5 +1.3 11.9 5th 10.8 1.5 v high 720%
Tom Price 27.7 -1.5 38.0 28th     7.5 5th        
Wittenoom 28.1 -3.0 38.6 28th 15.4 -1.4 9.7 4th 72.6 3.5 highest 2074%
West Gascoyne (district 06)
Carnarvon Airport 26.2 +1.9 32.6 24th 13.1 -0.7 8.4 3rd 4.4 5.7 average 77%
Denham 25.1 +1.5 31.0 23rd 15.3 +0.7 10.4 3rd 6.6 7.9 average 84%
Emu Creek Station 29.6 -1.0 39.3 26th 14.8 +0.9 11.7 6th 0.2 2.1 average 10%
Gascoyne Junction 28.7 +0.4 39.6 28th 13.7 +1.7 9.2 3rd 7.6 3.1 high 245%
Shark Bay Airport 26.9 +1.3 36.6 28th 12.8 +0.3 7.5 3rd 4.8 7.7 low 62%
East Gascoyne (district 07)
Newman Aero 26.3 -4.2 37.5 30th 11.8 0.0 5.6 5th 44.6 4.6 highest 970%
Paraburdoo Aero 28.8 -2.5 40.2 28th 14.3 +1.0 8.1 7th 28.4 3.7 v high 768%
Murchison (district 07A)
Meekatharra Airport 24.5 -1.1 34.7 27th 11.0 -0.5 5.0 3rd 25.0 4.9 v high 510%
Mount Magnet Aero 23.4 -1.0 32.6 26th 10.4 +0.3 4.8 3rd 21.4 9.0 high 238%
North Coast (district 08)
Dalwallinu 21.5 +0.7 30.6 29th 6.3 -0.4 1.3 13th 36.6 25.9 high 141%
Dalwallinu Comparison 22.0 +0.9 31.1 29th 6.9 -0.9 2.6 13th 38.3 25.3 high 151%
Eneabba 26.5 +3.7 34.7 29th 9.0 -0.7 4.8 4th        
Geraldton Airport 24.1 +2.1 36.1 29th 7.7 -1.5 1.9 14th 4.8 32.1 lowest 15%
Kalbarri 26.0 +2.2 34.3 29th 10.9 +0.2 3.6 3rd 19.2 23.8 average 81%
Morawa Airport 23.7 +1.0 33.7 29th 7.2 -0.2 2.6 13th 8.8 25.0 v low 35%
Mullewa 24.4 +1.0 34.8 29th 9.1 +0.6 4.4 13th 5.6 21.7 low 26%
North Island 23.2 +1.5 29.2 29th 16.6 +0.8 11.9 7th 10.6 20.0 low 53%
Wongan Hills 22.4 +1.8 30.5 25th 6.7 -0.9 1.4 13th 10.0 29.1 low 34%
Central Coast (district 09)
Badgingarra Research Stn 22.2 +1.7 32.0 29th 7.8 +0.3 3.4 3rd 29.4 50.8 low 58%
Bickley 19.0 +1.7 26.4 29th 7.6 -0.6 3.0 13th 33.4 120.5 v low 28%
Champion Lakes 21.1   28.2 29th 9.7   4.8 13th 31.2
Garden Island HSF 20.2   28.0 30th 10.9   7.3 13th 25.4
Gingin Aero 22.5 +2.2 30.9 29th 6.1 -1.3 -0.2 3rd 41.0 83.7 low 49%
Gosnells City 22.6 +2.1 29.4 29th     4.2 10th 24.8 80.5 v low 31%
Jandakot Aero 22.0 +2.2 29.3 29th 6.6 -1.5 0.5 13th 32.4 84.6 v low 38%
Jurien Bay 23.7 +2.6 34.2 29th 8.2 -1.7 3.4 14th 9.8 44.2 v low 22%
Karnet 19.7 +2.3 26.5 29th 6.6 -0.6 2.0 10th 37.8 128.1 v low 30%
Lancelin 23.0 +2.7 32.3 29th 9.1 -1.5 4.5 2nd 8.0 56.4 lowest 14%
Medina Research Centre 21.9 +1.7 29.0 29th 7.9 -1.2 2.2 3rd 33.6 76.1 v low 44%
Pearce RAAF 21.7 +1.8 29.7 29th 8.2 -0.6 2.5 11th 35.8 69.0 low 52%
Perth Airport 22.1 +2.0 29.7 29th 8.0 -0.9 2.7 13th 28.2 71.3 v low 40%
Perth Metro 21.8 +1.8 29.0 29th 8.2 -1.3 2.4 13th 43.6 86.2 v low 51%
Rottnest Island 19.6 +0.9 25.6 29th 12.7 -0.1 8.6 13th 36.6 52.9 low 69%
Swanbourne 21.5 +2.0 29.8 29th 9.8 -1.1 4.9 13th 47.8 80.4 low 59%
South Coast (district 09A)
Albany 17.2 0.0 27.2 23rd 10.1 +0.9 6.4 8th 57.2 101.4 low 56%
Albany Airport 17.5 +0.2 26.7 23rd 7.2 -0.8 4.0 23rd 50.6 86.0 low 59%
Bridgetown 18.5 +1.3 25.2 30th 4.0 -2.0 0.2 22nd 36.6 92.6 v low 40%
Bridgetown Comparison 19.3 +1.0 26.1 23rd 4.4 -1.3 1.6 10th 29.9 88.0 v low 34%
Bunbury 20.1 +1.9 27.3 30th 6.9 -1.7 1.4 13th        
Busselton 19.7 +1.5 27.7 30th 7.4 -1.6 3.8 13th 20.2 80.7 v low 25%
Busselton Aero 20.0 +2.1 27.9 30th 6.1 -1.7 1.7 10th 19.0 81.0 v low 23%
Cape Leeuwin 18.4 +1.4 24.9 23rd 12.0 +0.2 8.7 13th 45.8 91.2 low 50%
Cape Naturaliste 19.1 +1.8 27.3 30th 10.3 -0.1 7.1 2nd 14.0 76.2 v low 18%
Collie East 20.4   27.0 30th 3.7   -0.9 13th 29.6
Donnybrook 20.6 +1.8 27.7 30th 6.6 -0.5 0.6 13th 35.1 101.7 v low 35%
Dwellingup 19.6 +2.4 26.5 29th 5.1 -1.3 0.5 13th 39.8 129.6 v low 31%
Esperance 18.4 -0.9 25.9 23rd 8.5 -1.0 5.2 20th 19.4 61.1 v low 32%
Esperance Aero 17.4 -1.3 24.7 23rd 6.9 -1.5 4.0 14th 40.2 58.1 low 69%
Harvey 20.2   27.5 30th 7.4   3.5 13th 27.8 109.0 v low 26%
Hopetoun North 18.6 -1.9 27.0 23rd 7.8 -0.9 3.4 21st 85.8 51.6 high 166%
Jarrahwood 19.7 +1.7 26.5 30th 4.1 -2.0 -0.7 15th 27.4 102.2 lowest 27%
Mandurah 20.7   28.0 30th 10.9   7.0 10th 18.6
Manjimup 18.2 +1.8 25.7 23rd 6.2 -1.0 3.7 10th        
North Walpole 17.7   25.8 23rd 8.6   4.0 14th 60.2
Pemberton 18.2 +1.6 25.5 23rd 7.1 -0.5 3.9 14th 59.7 128.2 v low 47%
Rocky Gully 17.4 +1.2 25.7 23rd 5.7 -1.4 2.6 10th 37.4 92.4 v low 40%
Shannon 17.4 +1.2 24.9 23rd 6.2 -1.1 2.5 14th 2.4 131.6 v low 2%
Windy Harbour 17.9 +0.4 24.6 21st 8.4 -1.0 3.0 19th 89.5 108.7 low 82%
Witchcliffe 18.3 +1.2 25.0 23rd 6.9 -1.9 3.0 15th 48.0 110.8 v low 43%
North Central (district 10)
Bencubbin 21.1 +0.2 29.6 25th 7.0 -0.1 0.5 13th 7.3 21.8 low 33%
Cunderdin Airfield 22.4 +2.0 29.2 29th 4.3 -0.5 -2.6 13th 4.4 26.0 v low 17%
Kellerberrin 21.5 +0.8 29.0 25th 5.3 -1.2 -0.5 3rd 8.6 26.0 low 33%
Merredin 21.7 +1.3 29.8 25th 6.6 -0.1 -1.3 13th 9.2 25.6 low 36%
Northam 22.1 +1.7 30.0 29th 5.2 -1.7 -0.9 13th 16.6 37.0 low 45%
York 21.9 +2.2 29.5 29th 2.8 -2.2 -2.2 13th 11.9 37.0 v low 32%
South Central (district 10A)
Brookton 20.6 +1.5 27.4 23rd 4.7 -0.6 -1.5 13th 10.2 38.1 v low 27%
Corrigin 20.6 +1.5 27.4 24th 4.6 -1.2 -0.3 10th 8.8 29.7 v low 30%
Hyden 21.8 +1.6 29.0 24th 4.9 -1.0 0.0 11th 5.7 27.6 v low 21%
Jacup 18.6 +0.1 27.8 23rd 4.4 -1.9 0.8 10th 26.8 47.9 average 56%
Katanning 18.6 +1.4 26.8 23rd 4.3 -1.9 1.3 19th
Katanning Comparison 19.1 +1.4 27.0 23rd 4.0 -2.4 1.0 2nd 15.6 46.4 v low 34%
Lake Grace 19.7 +0.8 27.2 23rd 4.8 -1.6 -0.7 10th 3.0 28.1 v low 11%
Lake Grace Comparison 19.8 +0.7 27.4 23rd 5.3 -1.3 0.0 10th 4.4 30.3 v low 15%
Narembeen 21.9 +1.5 28.2 25th 5.1 -1.0 0.9 13th 7.2 25.6 v low 28%
Narrogin 19.3 +1.7 26.5 23rd 4.5 -1.5 -0.2 13th 8.6 46.2 v low 19%
Newdegate Research Station 19.5 +0.9 27.0 23rd 2.2 -2.9 -2.4 10th 4.6 34.2 lowest 14%
Ongerup 18.6 +0.8 26.8 23rd 4.8 -1.7 0.7 11th 9.8 38.3 v low 26%
Pingelly 20.2 +2.0 27.0 23rd 5.8 -0.7 0.0 13th 11.8 40.4 v low 29%
Ravensthorpe 18.7 -0.7 27.1 23rd 6.1 -1.3 2.0 15th 35.3 41.6 average 85%
Wagin 19.6 +1.5 26.9 23rd 4.3 -1.9 1.0 10th 13.0 40.9 v low 32%
Wandering 19.8 +1.7 27.2 23rd 3.0 -1.9 -1.8 14th 13.6 52.5 v low 26%
Eucla (district 11)
Balladonia 19.9 -2.4 31.4 26th 5.9 -0.9 1.5 11th 17.7 20.1 average 88%
Eucla 17.8 -3.5 25.6 24th 8.9 -0.2 3.3 16th 148.4 22.5 highest 660%
Eyre 19.0 -2.1 27.7 26th 6.8 -0.9 -3.2 11th 57.8 23.9 v high 242%
Forrest 18.6 -5.9 27.1 26th 7.6 -0.6 4.0 16th 83.0 17.0 v high 488%
Red Rocks Point 17.9   26.0 24th 9.6   4.1 15th 58.4
South East (district 12)
Bulga Downs 24.1   37.5 26th 8.5   4.2 3rd 25.8 7.7 v high 335%
Kalgoorlie-Boulder Airport 20.1 -2.2 32.2 26th 7.8 -0.2 3.8 13th 31.6 14.2 v high 223%
Laverton Aero 20.8 -3.6 32.0 26th 9.1 -1.3 3.4 4th 53.0 8.5 v high 624%
Leinster Aero 22.5 -3.1 34.5 30th 9.2 -1.5 3.7 4th 26.8 4.2 v high 638%
Leonora 22.0 -2.9 33.0 26th 9.1 -0.9 5.0 4th 37.2 9.2 v high 404%
Leonora Aero 21.6   33.2 26th 9.5   5.1 14th 31.8
Munglinup West 18.4   27.3 23rd 5.9   2.1 10th 26.0
Norseman                 18.2 21.4 average 85%
Norseman Aero 20.3 -2.1 29.5 24th 4.6 -1.8 -1.7 14th 12.2 25.0 average 49%
Salmon Gums Res.Stn. 19.6 -0.7 28.0 24th 2.3 -3.5 -3.1 20th 17.4 31.9 low 55%
Southern Cross Airfield 21.2 -0.2 29.0 24th 5.1 +0.1 -2.2 13th 14.8 22.2 v low 67%
Yeelirrie 23.2 -2.6 35.5 30th 7.1 -0.8 2.5 4th 35.1 4.7 v high 747%
North East (district 13)
Balgo Hills 30.2 -3.6 36.8 30th 17.1 -1.6 10.6 20th 17.5 3.2 v high 547%
Carnegie 24.6 -4.0 37.7 30th 10.4 -1.2 3.6 4th 28.3 4.1 highest 690%
Giles Meteorological Office 23.2 -4.2 32.5 28th 11.4 -1.6 5.3 5th 62.4 11.4 highest 547%
Telfer Aero 29.3 -3.5 39.0 30th 15.7 -0.8 9.5 4th 21.0 2.6 v high 808%
Warburton Airfield 23.0 -4.9 33.6 27th 11.0 -0.2 4.4 4th 57.8 5.9 highest 980%
Wiluna 24.0 -2.3 36.2 30th 8.3 -1.6 3.0 6th 29.4 4.6 v high 639%

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 Friday 1 October 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.
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