Western Australia in June 2010: A very dry June for WA

  • Rainfall very much below average for WA and the 3rd driest June for southwest.
  • Mean maximum temperature above average for WA.
  • Mean minimum temperature above average for WA, but below average for southwest

Rainfall

Much of WA experienced below to very much below average rainfall for June 2010, particularly in parts of the Southwest Land Division (SWLD). Averaged across the state, June rainfall was very much below average (see June rainfall totals & decile maps), whilst it was the third driest June on record when averaged over the southwest (southwest of a line from Jurien to Bremer Bay). The only significant part of WA to see above average rainfall in June was the far west Pilbara and neighbouring Gascoyne.

A middle level cloud band brought heavy rainfall to the far west Pilbara on the 15th and 16th, with reports of over 100 mm near Exmouth Gulf. A daily total of 120 mm at Winning (west Pilbara) was the highest daily rainfall in WA for June 2010, and also a record daily rainfall for June at Winning.

Apart from coastal areas in the South and Southeast Coastal districts, most of the SWLD received less than half their normal June rainfall as the result of only a few cold fronts passing through the region. Numerous sites in the SWLD experienced their driest June on record.

Maximum temperature

Above to very much above average mean maximum temperatures were recorded in the west Kimberley, Pilbara, north Gascoyne and adjacent Interior. Pockets of up to 4 °C above normal mean maxima were reported in the inland Pilbara, and several sites in the district recorded their highest mean maximum temperature for June on record. Below average mean maximum temperatures up to 2.0 °C cooler than normal occurred in the east Kimberley (see June maximum temperature decile & anomaly maps). When averaged over the whole state, however, June 2010 was above average.

A high pressure system over central Australia brought unusually warm temperatures in the Pilbara and west Kimberley from the 18th to 20th with temperatures above 35 °C reported. Onslow Airport, Roebourne and Bidyadanga all recorded their highest June daily maximum temperature on record during this period.

Minimum temperature

Above to very much above average mean minimum temperatures were recorded in a broad band across the southwest Kimberley, Pilbara, northern Gascoyne, northern Goldfields, and Interior, with up to 4 °C above normal mean minima in parts of the west Pilbara, northern Gascoyne and far east Interior (see June minimum temperature decile & anomaly maps). Onslow Airport recorded their warmest June nights on record with a mean minimum temperature of 19.6 °C, which is 0.5 °C above the previous record.

A small part of north Kimberley, as well as most of SWLD saw below to very much below average mean minima, with up to 3 °C below normal mean minima in the Lower West and Southwest districts. When averaged over the whole state, June 2010 was above average, however, the southwest (southwest of the line from Jurien to Bremer Bay) was below average.

In the last week of June, most of the southern half of the state experienced some very cold nights. Locations in the SWLD, southern Goldfields and Eucla recorded their lowest temperature for June on record, and Norseman Aerodrome in the Goldfields recorded -6.0 °C on the 27th, which was the equal coldest June night on record for WA, equal the -6.0 °C at Collie East on the 17th June 2006.

Details Extremes Records Summaries Important notes the top

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Extremes in June 2010
Hottest day 36.2 °C at Bidyadanga on the 19th
Warmest days on average 32.1 °C at Bidyadanga
Coolest days on average 15.3 °C at Rocky Gully
Coldest day 11.1 °C at Rocky Gully on the 24th
Coldest night -6.0 °C at Norseman Aero on the 27th
Coolest nights on average 2.6 °C at Jarrahwood
Warmest nights on average 24.2 °C at Troughton Island
19.5°C at Truscott (mainland)
Warmest night 26.4 °C at Troughton Island on the 2nd
26.2 °C at Kuri Bay(mainland) on the 3rd
Wettest overall 154.6 mm at Walpole
Wettest day 120.0 mm at Winning on the 16th
Highest wind gust 93 km/h at Cape Naturaliste on the 14th

Record highest June daily rainfall
Highest daily rainfall
in June 2010 (mm)
Previous highest
for June
Years of
record
Winning 120.0 on the 16th 84.1 on the 15th in 1948 68
Learmonth Airport 95.0 on the 16th 89.6 on the 4th in 2002 57



Record lowest total June rainfall
Total rainfall
for June 2010 (mm)
Previous lowest
for June
Years of
record
Average for
June
Bridgetown Comparison 29.4 32.0 in 2006 124 145.5
Boyanup 59.8 73.1 in 1993 110 194.8
Kondut 12.2 16.6 in 2006 80 59.5
Wongan Hills Res.Station 16.7 19.3 in 1978 73 62.5
Gabbin 12.4 13.2 in 1952 67 56.4
Gidgegannup 40.2 59.0 in 1958 46 182.7
Lancelin 31.0 34.8 in 2006 45 123.7
Jurien Bay 23.0 25.8 in 2006 41 108.4
Spring Valley 18.4 22.0 in 1984 40 58.8
Jarrahwood 44.0 52.8 in 2006 35 163.1




Record highest June temperature
Highest temperature
in June 2010 (°C)
Previous highest
for June
Years of
record
Average for
June
Roebourne 35.7 on the 18th 35.4 on the 3rd in 1998 53 27.0
Bidyadanga 36.2 on the 19th 35.8 on the 5th in 1999 52 29.7
Onslow Airport 33.2 on the 20th 32.3 on the 13th in 2004 45 25.8



Record highest June mean daily maximum temperature
Mean daily maximum
temperature
for June 2010 (°C)
Previous highest
for June
Years of
record
Average for
June
Roebourne 30.1 29.6 in 2004 90 27.0
Port Hedland Airport 29.9 29.8 in 1996 61 27.5
Wittenoom 27.1 26.9 in 1962 55 24.4
Mardie 30.7 30.6 in 1988 54 28.1
Bidyadanga 32.1 31.9 in 1970 51 29.7
Onslow Airport 28.9 28.5 in 2004 44 25.8




Record lowest June temperature
Lowest temperature
in June 2010 (°C)
Previous lowest
for June
Years of
record
Average for
June
Corrigin -4.0 on the 26th -3.8 on the 1st in 1964 62 5.9
Dalwallinu Comparison -0.3 on the 26th 0.0 on the 22nd in 1981 54 7.9
Norseman -4.6 on the 27th -2.8 on the 16th in 1960 54 6.3
Balladonia -2.3 on the 26th -2.2 on the 14th in 2006 44 5.8
Brookton -2.9 on the 26th -2.6 on the 26th in 1973 43 5.5
Wongan Hills -0.8 on the 25th -0.5 on the 30th in 1990 43 7.7
Narembeen -2.6 on the 25th -1.2 on the 18th in 1985 38 6.4



Record highest June mean daily minimum temperature
Mean daily minimum
temperature
for June 2010 (°C)
Previous highest
for June
Years of
record
Average for
June
Onslow Airport 16.9 16.4 in 1965 44 14.1



Summary statistics for June 2010
Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(millimetres)
Mean for
June
2010
Diff
from
average
Highest for
June
2010
Mean for
June
2010
Diff
from
average
Lowest for
June
2010
Total for
June
2010
Average
for
June
Rank of
June
2010
Fraction of
June
average
North Kimberley (district 01)
Doongan 28.5 -0.6 31.4 26th     8.1 23rd 0 6.2 v low 0%
Kalumburu 30.6 -0.8 33.5 26th 14.9 +0.8 10.6 5th 0 4.1 v low 0%
Mount Elizabeth 28.5 +0.4 31.1 26th 9.5 +0.4 5.1 23rd 0 13.4 lowest 0%
Troughton Island 29.4 +0.4 30.6 2nd 24.2 +0.9 23.0 11th 0 8.1 v low 0%
Truscott 29.8   32.3 25th 19.5   16.1 7th 0
Wyndham 31.0 -0.1 34.5 19th 16.9 -0.8 14.4 23rd 0 4.0 lowest 0%
Wyndham Aero 31.2   34.7 25th 16.2   12.0 5th 0 4.1 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 28.6 -0.7 32.1 26th 15.8 -0.3 13.3 21st 0 4.9 v low 0%
Halls Creek Airport 26.7 -0.6 30.2 26th 14.3 +0.6 11.3 4th 0 5.6 lowest 0%
Kununurra Aero 29.4 -0.9 33.0 26th 14.9 -1.2 11.4 8th 0 3.8 lowest 0%
Warmun 28.5 -1.0 32.5 25th 13.9 +0.1 10.5 7th 0 6.4 lowest 0%
West Kimberley (district 03)
Bidyadanga 32.1 +2.4 36.2 19th 17.3 +1.9 14.0 24th 0 19.8 lowest 0%
Broome Airport 31.1 +2.0 34.5 19th 16.4 +1.2 10.9 24th 0 18.0 lowest 0%
Curtin Aero 31.7 +1.0 34.7 19th 17.2 +0.5 14.5 19th 0 9.5 v low 0%
Cygnet Bay 29.6 +0.9 33.0 22nd 16.8 +0.2 12.0 24th 0 19.3 lowest 0%
Derby Aero 30.9 +0.4 33.6 19th 16.5 +0.7 12.6 21st 0 8.0 lowest 0%
Fitzroy Crossing Aero 31.3 +1.1 34.0 19th 14.2 +1.5 8.6 23rd 0 9.3 v low 0%
West Roebuck 32.0 +1.6 35.4 19th 15.6 +3.2 11.5 12th 0 11.4 v low 0%
De Grey (district 04)
Bedout Island 27.0   29.0 24th 21.9   19.0 30th
Karratha Aero 28.3 +1.9 32.8 18th 17.1 +2.2 12.1 30th 0 29.5 lowest 0%
Legendre Island 26.4   29.0 19th 20.7   18.0 30th
Mandora 30.9 +1.9 34.6 19th     12.6 24th 0 17.1 lowest 0%
Marble Bar 28.8   33.6 18th 15.4   11.7 23rd 0 14.9 v low 0%
Pardoo Station 30.2 +2.0 33.8 19th 15.8 +1.1 10.5 3rd 0 26.9 lowest 0%
Port Hedland Airport 29.9 +2.4 34.5 18th 16.7 +2.6 12.4 27th 0.2 21.2 v low 1%
Roebourne 30.1 +3.1 35.7 18th 17.4 +2.1 12.7 27th 0 29.0 lowest 0%
Roebourne Aero 29.6   35.2 18th 15.6   11.2 27th 0 18.6 v low 0%
Fortescue (district 05)
Barrow Island Airport 25.6 +1.4 29.2 20th 20.6 +2.1 16.7 26th 0.6 21.4 low 3%
Learmonth Airport 26.3 +1.5 29.6 1st 15.8 +2.8 10.1 30th 140.0 41.9 v high 334%
Mardie 30.7 +2.6 33.8 20th 16.8 +3.0 11.8 1st 0 36.9 lowest 0%
Onslow 28.3 +2.8 32.6 20th 17.5 +4.3 12.0 28th 10.8 43.8 average 25%
Onslow Airport 28.9 +3.1 33.2 20th 16.9 +2.8 12.3 28th 9.6 44.7 average 21%
Tom Price 26.0 +2.8 31.2 18th     10.6 14th 0 25.5 lowest 0%
Wittenoom 27.1 +2.7 32.1 17th 15.6 +2.8 11.6 29th 2.0 28.3 low 7%
West Gascoyne (district 06)
Carnarvon Airport 23.6 +0.3 29.6 2nd 13.8 +1.5 7.9 27th 40.8 47.6 average 86%
Denham 22.4 -0.5 29.0 2nd 14.8 +1.0 8.6 28th 35.2 54.3 average 65%
Emu Creek Station 28.0 +2.1 31.9 22nd 16.1 +3.6 11.6 1st 44.5 37.3 average 119%
Gascoyne Junction 24.8 +1.0 30.0 3rd 13.7 +3.3 7.5 27th 28.2 31.8 average 89%
Shark Bay Airport 23.2   29.5 2nd 12.9   4.9 27th 30.2 37.0 average 82%
East Gascoyne (district 07)
Newman Aero 24.8 +1.9 31.4 17th 10.9 +4.4 5.9 29th 0.2 14.2 low 1%
Paraburdoo Aero 27.6 +2.6 32.4 20th 14.8 +4.1 8.7 1st 2.2 22.7 low 10%
Murchison (district 07A)
Meekatharra Airport 20.2 +0.6 27.8 22nd 10.4 +1.7 3.8 26th 13.0 30.6 average 42%
Mount Magnet Aero 19.1 -0.8 26.8 15th 8.7 +0.6 0.5 28th 25.2 17.6 high 143%
North Coast (district 08)
Carnamah 18.9 -0.1 25.0 14th 8.5 -0.2 2.5 27th 22.6 76.4 v low 30%
Dalwallinu 17.8 -0.8 23.7 14th 6.5 -0.6 0.3 26th 16.8 30.8 low 55%
Dalwallinu Comparison 18.0 -0.2 23.7 14th 6.3 -1.6 -0.3 26th 18.0 63.9 v low 28%
Geraldton Airport 20.7 -0.2 26.8 13th 9.9 -1.1 1.5 27th 24.8 99.3 v low 25%
Kalbarri 22.9 +0.1 29.2 2nd 11.2 +0.2 1.2 28th 48.6 81.5 low 60%
Morawa Airport 19.4 -0.7 25.2 3rd 7.0 -0.3 -1.6 26th 19.8 36.0 low 55%
Mullewa 20.1 +0.2 26.0 3rd 9.0 +0.5 2.4 26th 30.8 64.6 low 48%
North Island 21.7   25.5 13th 16.6   12.5 22nd 33.6
Wongan Hills 17.9 -0.2 23.3 13th 6.5 -1.2 -0.8 25th 18.8 71.4 v low 26%
Central Coast (district 09)
Badgingarra Research Stn 17.8 -0.9 23.9 13th 8.0 -0.4 1.4 27th 26.4 104.0 v low 25%
Bickley 16.0 0.0 21.1 13th 7.8 -0.2 2.4 25th 65.4 205.3 v low 32%
Champion Lakes 18.5   23.0 13th 9.2   3.0 25th 56.4
Garden Island HSF 18.5   23.0 13th 11.2   5.8 25th 54.6
Gingin Aero 19.0 -0.6 24.8 13th 4.9 -2.5 -3.6 26th 41.6 118.7 low 35%
Gooseberry Hill 17.6 +0.2 22.8 13th 9.7 -0.5 5.0 25th
Gosnells City 19.7 +0.2 25.0 13th 8.2 -1.6 0.5 26th 60.5 175.1 v low 35%
Jandakot Aero 19.1 +0.3 24.3 13th 5.5 -1.9 -2.5 26th 65.6 161.1 v low 41%
Jurien Bay 20.5 0.0 24.0 13th 8.3 -2.0 1.8 25th 23.0 108.4 lowest 21%
Karnet 16.7 +0.4 21.5 13th 5.9 -1.4 -1.0 25th 55.0 215.9 v low 25%
Lancelin 20.4 +0.3 24.7 13th 9.0 -1.9 2.5 27th 31.0 123.7 lowest 25%
Medina Research Centre 19.4 +0.1 24.7 13th 7.4 -1.6 0.0 26th 60.5 147.7 v low 41%
Pearce RAAF 19.0 +0.2 24.4 13th 7.1 -2.3 -0.4 25th 28.0 136.5 v low 21%
Perth Airport 19.3 +0.4 24.7 13th 7.4 -1.6 0.2 26th 43.8 162.7 v low 27%
Perth Metro 19.0 -0.3 24.6 13th 7.1 -1.5 -0.6 26th 51.4 176.7 v low 29%
Rottnest Island 18.1 -0.6 22.4 13th 13.3 +0.1 8.9 24th 72.0 109.4 low 66%
Swanbourne 19.2 -0.1 24.3 13th 9.5 -1.1 2.9 25th 57.8 127.1 v low 45%
South Coast (district 09A)
Albany 17.2 +0.7 21.9 13th 9.4 +0.4 5.5 10th 108.0 133.0 low 81%
Albany Airport 16.6 0.0 20.8 13th 7.3 -0.8 0.9 10th 87.4 105.1 low 83%
Bridgetown 16.7 +0.1 20.9 21st 3.1 -2.0 -2.6 10th 33.4 113.2 v low 30%
Bridgetown Comparison 17.6 +0.9 22.0 13th 3.2 -2.0 -2.6 10th 29.4 145.5 lowest 20%
Bunbury 18.0 -0.4 21.0 6th 5.8 -2.3 -0.1 25th 63.4 147.1 low 43%
Busselton 17.7 -0.5 20.3 22nd 7.0 -1.9 2.0 10th 83.8 133.6 low 63%
Busselton Aero 17.4 -0.4 20.1 22nd 5.7 -1.9 -0.1 10th 57.0 138.2 v low 41%
Cape Leeuwin 18.1 +0.8 21.3 13th 12.6 +0.5 8.6 24th 75.0 177.6 v low 42%
Cape Naturaliste 17.6 +0.3 20.7 12th 10.6 -0.9 5.9 24th 94.4 166.6 low 57%
Collie East 17.6   21.9 13th 3.2   -3.0 11th 41.2
Donnybrook 17.9 +0.5 22.7 13th 5.8 -0.8 0.5 25th 57.0 192.1 v low 30%
Dwellingup 16.6 +0.7 21.0 13th 4.9 -1.6 -2.0 25th 98.8 243.9 v low 41%
Esperance 18.1 +0.1 22.2 14th 9.1 0.0 4.2 26th 70.8 81.3 average 87%
Esperance Aero 17.0 -0.2 21.8 14th 8.3 -0.1 3.7 26th 53.4 67.7 average 79%
Harvey 18.4   22.5 14th 7.4   1.0 30th 65.6 144.3 low 45%
Hopetoun North 18.0 -1.2 22.1 13th 8.8 +0.3 3.4 11th 52.2 49.7 average 105%
Jarrahwood 17.6 +0.5 21.0 21st 2.6 -2.7 -3.2 10th 44.0 163.1 lowest 27%
Mandurah 18.3   20.9 12th 10.5   4.9 25th 77.6
Manjimup 16.0 +0.8 20.7 13th 6.6 -0.8 2.2 10th   166.8    
North Walpole 16.9   20.7 21st 9.4   3.7 11th
Pemberton 16.9 +1.0 20.6 21st 7.4 -0.7 2.6 11th   192.9    
Rocky Gully 15.3 -0.2 20.1 13th 6.5 -1.2 1.4 25th 50.6 85.1 low 59%
Shannon 15.7 0.0 19.7 6th 6.6 -0.9 2.2 10th 70.2 164.6 v low 43%
Windy Harbour 17.7 +0.1 21.3 12th 8.8 -0.6 1.6 10th 144.8 176.2 average 82%
Witchcliffe 17.4 0.0 20.1 20th 7.1 -1.6 -0.7 10th 115.6 169.9 low 68%
North Central (district 10)
Bencubbin 17.5 +0.1 23.6 14th 5.9 -1.3 -1.7 26th   49.7    
Cunderdin Airfield 17.9 -0.5 23.4 13th 4.6 -1.2 -3.1 26th 15.6 39.2 v low 40%
Kellerberrin 17.6 +0.1 22.7 14th 4.5 -2.3 -3.0 25th 20.2 54.6 v low 37%
Merredin 17.3 +0.1 22.8 14th 5.1 -1.7 -2.5 27th 21.0 50.0 low 42%
Northam 18.4 +0.5 23.9 13th 4.4 -2.1 -3.5 26th 24.7 80.4 v low 31%
York 18.3 -0.1 23.6 13th 3.7 -0.9 -3.0 25th 26.5 63.5 low 42%
South Central (district 10A)
Beverley 18.2 +0.3 23.4 13th 4.1 -1.9 -3.2 26th 28.6 79.4 v low 36%
Brookton 17.0 -0.1 22.0 13th 4.6 -0.9 -2.9 26th 32.2 87.2 v low 37%
Corrigin 16.8 +0.4 21.6 13th 4.7 -1.2 -4.0 26th 17.2 61.4 v low 28%
Hyden 18.3 +1.0 22.5 13th 5.0 -0.6 -4.0 25th 16.9 50.2 v low 34%
Jacup 16.5 -0.2 21.1 13th 6.5 +0.1 1.2 25th 43.8 40.9 average 107%
Katanning 15.9 -0.1 20.6 13th 6.0 -0.6 -0.2 25th 39.4 59.8 low 66%
Katanning Comparison 16.4 +0.9 21.0 13th 4.5 -2.0 -2.4 11th 38.9 76.5 low 51%
Lake Grace 16.2 -0.8 21.8 13th 6.1 -0.1 -1.1 26th 32.8 32.3 average 102%
Lake Grace Comparison 16.4 -0.1 21.4 13th 6.1 -0.6 -0.6 26th 31.0 51.0 low 61%
Narembeen 17.6 +0.2 21.9 13th 6.0 -0.4 -2.2 26th   52.7    
Narrogin 16.1 +0.7 20.5 13th 4.8 -1.6 -1.6 25th 37.8 87.2 v low 43%
Newdegate Research Station 15.9 -0.7 21.7 13th 5.2 +0.2 -2.0 26th   50.7    
Ongerup 16.1 +0.2 20.9 13th 6.1 -0.6 -0.4 25th 39.6 49.3 average 80%
Pingelly 16.7 +0.4 21.6 13th 5.6 -1.0 -1.4 26th 33.8 82.6 low 41%
Ravensthorpe 16.8 -0.4 20.4 13th 7.8 0.0 2.8 25th 29.0 43.6 average 67%
Wagin 16.7 +0.4 20.7 13th 4.9 -1.3 -1.2 11th 37.1 73.2 low 51%
Wandering 16.9 0.0 21.2 13th 3.2 -1.2 -2.9 11th 61.0 74.4 low 82%
Eucla (district 11)
Balladonia 18.5 +0.5 26.6 4th 5.4 -0.4 -2.3 26th 21.1 26.2 average 81%
Eucla 18.6 -0.1 26.1 23rd 7.6 -0.6 2.3 13th 26.8 30.2 average 89%
Eyre 19.7 +0.8 27.4 22nd 4.5 -2.4 -3.5 26th 33.8 39.4 average 86%
Forrest 18.4 -0.6 25.8 23rd 6.1 +0.1 1.1 26th 9.0 17.3 average 52%
Red Rocks Point 18.5   24.3 22nd 8.4   3.4 28th 38.8
South East (district 12)
Bulga Downs 19.7   26.2 15th 7.7   1.2 28th 7.4 26.6 low 28%
Kalgoorlie-Boulder Airport 17.4 -0.1 23.4 14th 6.2 0.0 -1.6 27th 6.4 28.5 low 22%
Laverton Aero 17.9 -0.4 26.0 22nd 8.9 +2.2 0.1 28th 7.8 13.8 average 57%
Leinster Aero 18.6 -0.6 27.7 22nd 8.3 +1.1 -0.3 27th 5.2 16.1 average 32%
Leonora 18.4 -0.6 23.8 15th 8.3 +1.0 0.5 28th 12.4 24.9 average 50%
Leonora Aero 18.7   24.6 15th 8.6   -0.3 28th 9.6
Munglinup West 16.6   20.0 14th 7.7   2.1 25th 36.8
Norseman 18.0 +0.6 24.5 14th 4.6 -1.7 -4.6 27th 12.6 30.4 low 41%
Norseman Aero 17.6 -0.5 24.4 14th 3.7 -0.9 -6.0 27th 9.0 14.7 low 61%
Southern Cross Airfield 17.3 -0.6 24.4 14th 3.8 -0.5 -4.2 27th 15.6 27.5 low 57%
Yeelirrie 19.6 +0.1 28.2 22nd 7.6 +2.9 1.1 29th 22.0 23.4 average 94%
North East (district 13)
Balgo Hills 26.1 0.0 30.8 18th 12.9 +0.2 10.0 11th 0 9.5 lowest 0%
Carnegie 21.1 +0.1 27.5 23rd 9.6 +2.7 3.0 14th 11.8 15.2 average 78%
Giles Meteorological Office 20.5 +0.2 26.4 17th 8.4 +0.3 3.7 11th 0 17.5 lowest 0%
Telfer Aero 26.9 +1.6 32.2 19th 13.7 +1.8 10.5 24th 0 12.5 lowest 0%
Warburton Airfield 21.0 +0.3 26.9 23rd 8.6 +2.2 3.1 15th 3.8 18.0 average 21%
Wiluna 19.9 0.0 28.2 22nd 8.7 +2.0 1.9 26th 13.5 24.1 average 56%

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 12 pm on Thursday 1 July 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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