Western Australia in June 2011: A cool month for northern WA, dryer than normal in the southwest.

  • Rainfall: Near average for WA; below average in southwest WA.
  • Maximum temperature: Near average for WA; above average for southwest WA.
  • Minimum temperature: Below average for WA; above average for southwest WA.

Rainfall

Despite several strong cold fronts moving through southern WA during June 2011, rainfall totals were generally near to or below average across the Southwest Land Division (SWLD), with very much below average rainfall notable in the Southeast Coastal district. Other areas of below to very much below average were observed in central parts of WA. Rainfall was above to very much above average in parts of the Goldfields, Eucla, and Interior (see June 2011 rainfall totals & deciles), with some sites reporting their highest June rainfall in over 30 years. When averaged across the state as a whole, rainfall during June 2011 was near average, however the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) observed below average rainfall. Comparable records commenced in 1900.

A strong cold front produced moderate to heavy rainfall in western parts of the SWLD at the start of June, with daily rainfall totals of 20 to 40 mm recorded in the 24 hours to 9 am on the 2nd in the Lower West and parts of the Southwest district. Some damage was reported in Perth, mainly due to flash flooding.

A cloudband over the Pilbara produced heavy rainfall on the 6th and 7th, particularly at Onslow which observed 30.4 mm in the 24 hours to 9am on the 6th, followed by 70.4 mm in the 24 hours to 9am on the 7th. The rainfall total over the two days was more than twice the June monthly average rainfall at Onslow. Onslow Airport and Exmouth Town observed 64.6 mm and 53.2 mm respectively in the 24 hours to 9am on the 7th.

A middle level low over the southeast of the state resulted in significant rainfall in the Eucla on the 7th and 8th, with Arubiddy observing 32.4 mm in the 24 hours to 9am on the 8th, which is a June record for the site. Partly as a result of this event, Arubiddy observed its 2nd wettest June in 47 years of record with 72.6 mm, just behind the 74.5 mm observed in 1968, whilst Eyre observed its 3rd wettest June on record.

Heavy rainfall was observed in the SWLD on the afternoon of the 24th and into the morning of the 25th as a strong cold front crossed the west coast, with widespread falls of 25 to 50 mm in southwest parts of the division, and isolated heavier falls of 50 to 70 mm in the Lower West and parts of the Southwest. Wokalup in the Southwest district broke its highest June daily rainfall record with 66.2 mm in the 24 hours to 9am on the 25th, while Worsley Downs observed 70.0 mm and Dwellingup 68.0 mm during the same event. Swanbourne recorded 32.6 mm in 30 minutes (between 1745 WST and 1814 WST) on the 24th, which equates to a 1 in 50 to 1 in 100 year event, whilst Swanbourne's 24 hour rainfall total of 63.8 mm to 9 am on the 25th exceeded its previous highest daily total for June in 18 years of record, which was 53.0 mm on 4 June 2002

The passage of a strong cold front across the SWLD on the 28th produced severe wind gusts, heavy rain and abnormally high tides. A number of severe wind gusts were observed, mainly in coastal parts of the Southwest district where Cape Naturaliste recorded the strongest gust recorded for this event, and the month, of 130 km/h at 0409 WST on the 28th. The highest rainfall observed was 49.4 mm in the 24hrs to 9am on the 28th at Myalup, whilst Bedfordale recorded 54.4 mm in the 24 hours to 9am on the 29th . A number of homes in the Southwest and Lower West received minor structural damage as a result of the winds, particularly in Quindalup (near Busselton), Mandurah and Rockingham, and at least one house reportedly received major damage.

Maximum temperature

Mean maxima during June 2011 were below average over much of the northeast of WA, with areas of very much below average maximum temperature in the north and east Kimberley where temperatures were up to 3 °C cooler than normal. Troughton Island in the far north Kimberley observed its coolest June on record with an average of 27.0 °C, breaking the previous record of 27.4 °C set in 1967. In contrast, the southwest of WA saw above average mean maximum temperatures, with an area of very much above average mean maxima in south coast SWLD districts (see June 2011 mean maximum temperature decile & anomaly maps). Albany observed its warmest June in 33 years, and its 3rd warmest June on record, with a mean maximum temperature of 18.2 °C, equal with June 1940, but well below the record of 18.8 °C set in 1921.

A number of cool days were observed in northern WA during the middle part of the month, particularly in the Kimberley from the 10th through to the 15th as cool air from the southeast of Australia moved over the region, with most sites observing daily maximum temperatures of less than 25 °C.

When averaged across the state, the mean maximum temperature for WA for June 2011 was near average, however the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) was in the above average range. The Lower Southwest has experienced its warmest start to the year (January to June) on record, with a mean maximum temperature of 25.4 °C, which is 1.3 °C above the average, and 0.1°C above the previous record of 25.3 °C set in 1972. Comparable records commenced in 1950.

Minimum temperature

Mean minimum temperatures during June 2011 were below to very much below average across the north of WA, with an area of lowest on record in the north and east Kimberley where temperatures were up to 5 °C cooler than normal. Several sites in the Pilbara and Kimberley recorded their coldest June in at least 30 years and Wyndham recorded its coolest month on record with a mean minimum temperature of 12.4 °C, easily breaking the previous record for any month of 14.1 °C set in July 2006 and July 2002. In contrast, the south of WA saw above to very much above average mean minima (see June 2011 minimum temperature decile & anomaly maps) with temperatures up to 2 °C above normal in the southeast of the state. Consequently, Albany observed its warmest June in 93 years of record with a mean minimum of 11.1 °C, exceeding the previous record of 11.0 °C set in June 1959.

A number of cool nights were observed in northern WA during the middle to latter part of the month, particularly in the Kimberley. Wyndham observed its coolest night on record for any month, with 8.3 °C on the 14th, breaking the previous record of 8.6 °C on 29 June 2004. Telfer Aerodrome also observed its coolest night on record on the 14th with 2.1 °C breaking the previous record of 2.5 °C set on 19 June 1976, and 4 August 1975.

When averaged across WA, mean minimum temperatures during June 2011 were below average; however the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) was above average. The Lower Southwest has experienced its warmest start to the year (January to June) on record, with a mean minimum temperature of 13.3 °C, which is 1.4 °C above the average, and 0.4 °C above the previous record of 12.9 °C set in 1978. Comparable records commenced in 1950.

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Extremes in June 2011
Hottest day 33.9 °C at Bidyadanga on the 6th
Warmest days on average 29.7 °C at Bidyadanga
Coolest days on average 16.1 °C at Rocky Gully
Coldest day 10.8 °C at Corrigin on the 14th
Coldest night -1.9 °C at Yeelirrie on the 14th
Coolest nights on average 5.1 °C at Warburton Airfield
Warmest nights on average 21.2 °C at Troughton Island
15.9 °C at Onslow
Warmest night 23.0 °C at Troughton Island on the 26th
23.0 °C at Pardoo on the 6th
Wettest overall 250.4 mm at Dwellingup
Wettest day 70.4 mm at Onslow on the 7th
70.0 mm at Worsley Downs on the 25th
Highest wind gust 130 km/h at Cape Naturaliste on the 28th

Record highest June daily rainfall
Highest daily rainfall
in June 2011 (mm)
Previous wettest
for June
Years of
record
Wokalup 66.2 on the 25th 63.5 on the 13th in 1961 60
Arubiddy 32.4 on the 8th 27.8 on the 5th in 1974 47



Highest total June rainfall for at least 30 years
Total rainfall
for June 2011 (mm)
Most recent June
at least this wet
Years since
wetter
Average for
June
Arubiddy 72.6 74.5 in 1968 42 24.6
Eyre 91.0 116.0 in 1934 38 40.0
Edjudina 57.0 57.1 in 1971 31 22.5



Highest June mean daily maximum temperature for at least 30 years
Mean daily maximum
temperature
for June 2011 (°C)
Most recent June
at least this warm
Years since
warmer
Average for
June
Albany 18.2 =18.2 in 1940 33 16.5



Record lowest June mean daily maximum temperature
Mean daily maximum
temperature
for June 2011 (°C)
Previous coolest
for June
Years of
record
Average for
June
Troughton Island 27.0 27.4 in 1967 31 29.0



Record lowest June temperature
Lowest temperature
in June 2011 (°C)
Previous coolest
for June
Years of
record
Average for
June
Wyndham 8.3 on the 14th 8.6 on the 29th in 2004 44 17.7
Telfer Aero 2.1 on the 14th 2.5 on the 19th in 1976 38 12.0



Record highest June mean daily minimum temperature
Mean daily minimum
temperature
for June 2011 (°C)
Previous warmest
for June
Years of
record
Average for
June
Albany 11.1 11.0 in 1959 93 9.0



Record lowest June mean daily minimum temperature
Mean daily minimum
temperature
for June 2011 (°C)
Previous coolest
for June
Years of
record
Average for
June
Wyndham 12.4 14.9 in 2002 43 17.7

Lowest June mean daily minimum temperature for at least 30 years
Mean daily minimum
temperature
for June 2011 (°C)
Most recent June
at least this cool
Years since
cooler
Average for
June
Halls Creek Airport 10.2 9.3 in 1967 44 13.7
Bidyadanga 12.8 12.6 in 1967 43 15.4
Roebourne 13.5 12.4 in 1967 43 15.3
Mandora 11.6 11.2 in 1976 34 14.2



Summary statistics for June 2011
Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(millimetres)
Mean for
June
2011
Diff
from
average
Highest for
June
2011
Mean for
June
2011
Diff
from
average
Lowest for
June
2011
Total for
June
2011
Average
for
June
Rank of
June
2011
Fraction of
June
average
North Kimberley (district 01)
Doongan 26.9 -2.2 30.4 8th 7.5 -4.1 2.4 15th 0 5.9 v low 0%
Kalumburu 29.3 -2.1 32.8 26th 9.8 -4.4 4.5 14th 0 3.8 v low 0%
Mount Elizabeth 26.2 -1.9 29.7 26th 5.8 -3.3 0.6 15th 0 13.1 lowest 0%
Troughton Island 27.0 -2.0 28.8 7th 21.2 -2.2 18.9 13th 0 7.8 v low 0%
Truscott 28.3   31.7 26th 15.4   11.3 15th 0
Wyndham 28.5 -2.6 32.1 8th 12.4 -5.3 8.3 14th 0 4.0 lowest 0%
Wyndham Aero 29.0 -2.0 32.5 26th 11.7 -4.0 6.9 15th 0 3.9 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 26.7 -2.5 30.6 8th 12.4 -3.7 8.3 14th 0 4.8 v low 0%
Halls Creek Airport 24.7 -2.6 29.1 6th 10.2 -3.5 5.3 14th 0.6 5.5 average 11%
Kununurra Aero 27.7 -2.6 31.6 8th 11.3 -4.8 6.7 14th 0 3.7 lowest 0%
Warmun 27.1 -2.4 31.0 7th 9.9 -3.9 4.7 14th 0 6.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 29.7 -0.1 33.9 6th 12.8 -2.6 5.2 13th 0 19.6 lowest 0%
Broome Airport 28.2 -1.0 31.6 27th 12.1 -3.1 5.9 15th 0 17.8 lowest 0%
Curtin Aero 29.1 -1.6 32.6 26th 13.3 -3.4 8.9 3rd 0 8.9 v low 0%
Cygnet Bay 26.7 -2.1 29.5 6th 13.7 -2.9 8.0 16th 0 18.9 lowest 0%
Derby Aero 28.7 -1.8 32.6 7th 11.9 -3.9 6.5 16th 0 7.9 lowest 0%
Fitzroy Crossing Aero 28.5 -1.8 32.4 6th 9.3 -3.6 4.7 13th 0 8.5 v low 0%
West Roebuck 29.5 -1.1 33.6 6th 10.9 -1.9 4.3 14th 0 10.5 v low 0%
De Grey (district 04)
Bedout Island 24.7   27.0 7th 19.7   17.0 16th
Karratha Aero 25.3 -1.3 29.0 3rd 13.1 -1.9 7.4 15th 12.4 29.0 average 43%
Legendre Island 24.2   27.0 3rd 17.9   13.9 15th
Mandora 28.5 -0.5 33.0 6th 11.6 -2.6 4.0 15th 0.8 16.9 average 5%
Marble Bar 26.5 -0.4 31.0 3rd 11.1 -2.1 6.0 16th 7.2 14.2 average 51%
Pardoo Station 27.9 -0.4 30.5 5th 13.3 -1.5 9.0 14th 1.0 26.7 average 4%
Port Hedland Airport 27.1 -0.5 30.5 3rd 12.2 -2.0 6.5 15th 1.0 20.9 low 5%
Roebourne 26.8 -0.2 31.2 3rd 13.5 -1.8 8.6 15th 10.3 28.8 average 36%
Roebourne Aero 26.4 -1.7 30.5 3rd 11.8 -1.8 6.1 15th 11.8 18.0 average 66%
Fortescue (district 05)
Barrow Island Airport 23.5 -0.8 27.7 5th 17.7 -1.0 15.1 22nd 60.6 24.7 high 245%
Learmonth Airport 24.9 +0.1 27.5 20th 13.1 0.0 7.3 22nd 18.0 41.6 average 43%
Mardie 26.9 -1.3 31.1 2nd 12.6 -1.3 7.3 15th 81.8 37.2 high 220%
Onslow 26.1 +0.6 29.8 2nd 15.9 +2.6 11.1 22nd 101.0 44.2 high 229%
Onslow Airport 25.8 -0.1 29.9 2nd 14.9 +0.8 10.6 17th 90.0 45.6 high 197%
Wittenoom 24.1 -0.4 28.6 3rd 10.6 -2.2 5.8 15th 14.2 28.0 average 51%
West Gascoyne (district 06)
Carnarvon Airport 24.2 +0.9 27.8 27th 12.3 0.0 7.5 13th 62.8 47.8 high 131%
Denham 22.8 -0.1 27.0 27th 15.1 +1.3 11.9 18th 78.0 54.5 high 143%
Emu Creek Station 26.8 +0.8 31.1 3rd 12.0 -0.6 6.0 24th 10.7 37.0 average 29%
Gascoyne Junction 23.8 0.0 28.8 1st 11.7 +1.2 6.2 13th 36.0 31.9 average 113%
Murchison     25.5 1st 8.5 +1.0 3.8 11th 34.6 26.7 high 130%
Shark Bay Airport 23.2 -0.8 26.4 27th 12.3 +0.5 7.7 12th 69.2 39.9 high 173%
East Gascoyne (district 07)
Paraburdoo Aero 25.1 -0.1 30.2 1st 10.6 -0.4 6.2 24th 15.4 22.5 average 68%
Murchison (district 07A)
Meekatharra Airport 20.8 +1.2 26.7 2nd 9.2 +0.4 5.7 19th 7.6 30.2 low 25%
Mount Magnet Aero 19.4 -0.5 24.2 1st 9.2 +1.0 6.1 8th 49.2 19.5 high 252%
North Coast (district 08)
Carnamah 19.4 +0.4 24.4 27th 9.1 +0.4 6.0 22nd 38.1 76.1 low 50%
Dalwallinu 18.4 -0.1 23.7 27th 8.4 +1.4 4.6 11th 44.4 31.7 high 140%
Dalwallinu Comparison 18.6 +0.4 23.6 27th     5.9 11th 46.5 63.7 average 73%
Geraldton Airport 21.2 +0.3 25.3 27th 11.5 +0.5 5.6 8th 98.6 99.3 average 99%
Kalbarri 23.6 +0.8 28.3 27th 12.1 +1.1 8.2 9th 60.6 81.0 average 75%
Morawa Airport 19.6 -0.5 25.0 27th 8.8 +1.5 5.1 8th 62.2 37.7 high 165%
Mullewa 20.5 +0.6 25.5 27th 9.9 +1.4 6.8 8th 65.5 64.6 average 101%
North Island 22.4 +0.1 26.0 1st 16.9 +0.2 10.9 18th 115.2 60.2 high 191%
Wongan Hills 18.8 +0.7 23.5 27th 8.8 +1.1 6.0 7th 52.5 71.3 average 74%
Central Coast (district 09)
Badgingarra Research Stn 18.6 -0.1 23.1 27th 9.3 +0.9 6.4 26th 91.2 103.8 average 88%
Bickley 16.4 +0.4 20.8 27th 9.0 +1.0 6.2 11th 196.8 205.1 average 96%
Champion Lakes 18.9   23.3 27th 11.5   7.9 8th 158.8
Garden Island HSF 19.3   22.5 27th 13.0   8.9 6th 126.8 120.0 average 106%
Gingin Aero 19.4 -0.2 24.6 27th 9.2 +1.9 3.2 6th 134.2 119.7 average 112%
Gosnells City 19.9 +0.3 24.8 27th 11.2 +1.5 7.7 17th 179.0 175.2 average 102%
Jandakot Aero 19.6 +0.7 24.4 27th 9.3 +2.0 1.3 6th 203.2 162.2 high 125%
Jurien Bay 21.3 +0.8 24.4 27th 11.1 +0.8     102.8 108.2 average 95%
Karnet 17.0 +0.7 21.3 27th         227.2 216.9 average 105%
Lancelin 21.2 +1.1 25.7 27th 10.9 +0.1 6.5 6th 108.0 123.3 average 88%
Medina Research Centre 19.6 +0.3 24.4 27th 10.7 +1.8 4.0 6th 160.6 148.2 average 108%
Pearce RAAF 19.4 +0.6 23.7 27th 10.4 +1.0 5.2 8th 112.4 136.1 average 83%
Perth Airport 19.7 +0.8 24.3 27th 10.0 +1.0 4.2 6th 137.6 162.4 average 85%
Perth Metro* 19.5 +0.3 24.3 27th 10.0 +1.6 3.3 6th 171.4 175.7 average 98%
Rottnest Island 19.1 +0.5 21.8 27th 14.1 +0.9 12.1 4th 118.8 148.9 average 80%
Swanbourne 19.9 +0.6 24.5 27th 11.5 +1.0 7.4 6th 183.2 130.2 high 141%
South Coast (district 09A)
Albany 18.2 +1.7 22.0 24th 11.1 +2.1 6.6 30th 123.2 133.1 average 93%
Albany Airport 17.5 +0.9 21.1 24th 9.3 +1.2 3.8 30th 88.8 104.8 low 85%
Bridgetown 17.0 +0.4 20.2 1st 6.7 +1.7 0.4 5th 94.8 111.9 low 85%
Bridgetown Comparison 18.1 +1.4 21.4 1st 5.9 +0.7 0.8 5th 90.3 145.0 low 62%
Bunbury 18.7 +0.3 20.4 27th 9.0 +1.1 1.1 5th 149.4 147.5 average 101%
Busselton 18.9 +0.7 21.6 1st 9.5 +0.8 3.2 4th 133.8 133.6 average 100%
Busselton Aero 18.6 +0.8 21.5 1st 7.8 +0.3 2.0 4th 119.6 136.7 average 87%
Cape Leeuwin 18.5 +1.2 20.6 27th 13.6 +1.5 10.2 7th 83.0 176.7 v low 47%
Cape Naturaliste 18.6 +1.3 21.7 23rd 13.0 +1.5 7.8 7th 94.0 165.9 low 57%
Collie East 17.1   21.1 27th 5.8   -1.3 5th 166.6
Donnybrook 18.5 +1.1 21.9 27th 7.5 +0.9 2.3 5th 164.3 191.8 average 86%
Dwellingup 16.8 +0.9 20.9 27th 7.9 +1.5 1.4 5th 250.4 244.0 average 103%
Esperance 19.4 +1.4 24.6 24th 10.0 +0.9 5.6 12th 41.2 80.3 v low 51%
Esperance Aero 18.1 +0.9 23.9 1st 9.1 +0.7 5.6 27th 28.0 66.8 v low 42%
Harvey 18.5 +0.1 21.8 24th 6.9 -1.4 2.0 5th 205.4 149.9 high 137%
Hopetoun North 19.3 +0.2 24.5 24th 9.6 +1.0 3.7 13th 37.6 48.9 average 77%
Jarrahwood 18.0 +0.9 21.0 1st 6.2 +1.0 -1.4 5th 127.0 162.1 low 78%
Mandurah 19.1   20.8 1st 12.6   8.7 5th 158.2 127.3 average 124%
Manjimup 16.7 +1.4 19.4 1st 8.4 +1.0 4.2 4th 100.2 166.1 low 60%
North Walpole 17.5   20.1 24th 10.8   5.4 4th 152.0
Pemberton 17.3 +1.4 20.4 1st 10.0 +1.9 4.9 8th 147.4 192.4 average 77%
Rocky Gully 16.1 +0.6 19.7 1st 8.4 +0.8 1.9 4th 102.8 86.3 average 119%
Shannon 16.2 +0.5 19.0 27th 8.6 +1.2     121.0 161.7 low 75%
Windy Harbour 18.3 +0.7 20.7 24th 10.0 +0.7 4.8 9th 169.1 176.0 average 96%
Witchcliffe 17.8 +0.4 20.4 1st 9.5 +0.9 2.3 7th 142.4 167.6 average 85%
North Central (district 10)
Bencubbin 18.1 +0.7 23.1 27th 8.6 +1.4 4.4 22nd 23.8 49.5 low 48%
Cunderdin Airfield 18.8 +0.4 23.5 23rd 7.7 +2.0 3.8 17th
Kellerberrin 18.9 +1.4 23.5 23rd 6.4 -0.3 0.1 6th 30.8 54.4 low 57%
Merredin 18.7 +1.5 22.7 27th 8.0 +1.3 3.0 22nd 30.0 49.8 low 60%
Northam 18.8 +0.9 23.2 23rd 7.3 +0.8 3.1 12th 68.8 80.4 average 86%
York 18.4 0.0 22.4 24th 6.2 +1.7 2.0 6th 52.5 62.8 average 84%
South Central (district 10A)
Beverley 18.5 +0.6 22.6 23rd 7.7 +1.8 2.6 6th 56.1 79.2 low 71%
Brookton 17.6 +0.5 21.8 24th 6.8 +1.3 3.0 17th 53.8 86.9 low 62%
Corrigin 17.4 +1.0 22.2 23rd 7.2 +1.3 2.5 6th 30.6 61.1 low 50%
Hyden 18.8 +1.5 22.7 23rd 6.3 +0.7 1.0 6th 18.6 49.8 v low 37%
Katanning 16.2 +0.2 19.8 24th 8.1 +1.5 3.5 5th 71.6 60.8 high 118%
Katanning Comparison 16.5 +1.0 20.0 24th 7.2 +0.7 0.4 5th 76.4 76.5 average 100%
Lake Grace 17.1 +0.2 21.4 24th 7.4 +1.2 1.7 5th 35.8 32.5 average 110%
Lake Grace Comparison 17.2 +0.7 21.2 24th 7.4 +0.7 1.7 5th 33.4 50.8 low 66%
Narembeen 18.5 +1.1 22.5 23rd 8.0 +1.7 3.1 17th 40.3 52.7 average 76%
Narrogin 16.4 +1.0 20.5 24th 7.5 +1.1 0.8 5th 80.0 87.1 average 92%
Newdegate Research Station 17.3 +0.8 21.5 24th 5.8 +0.8 0.4 5th 26.6 50.3 low 53%
Ongerup 16.8 +0.9 20.7 24th 7.5 +0.8 1.4 5th 49.0 49.3 average 99%
Pingelly 17.0 +0.7 21.4 24th 7.5 +1.0 3.7 5th 77.2 82.6 average 93%
Ravensthorpe 18.1 +0.9 22.6 24th 9.6 +1.8     16.3 43.4 v low 38%
Wagin 16.7 +0.4 20.5 24th 7.4 +1.3 1.0 5th 66.0 73.2 average 90%
Wandering 17.0 +0.1 20.8 24th 7.0 +2.7 -0.1 5th 94.0 75.9 average 124%
Eucla (district 11)
Balladonia 18.5 +0.5 26.1 1st 7.1 +1.3 1.6 26th 20.9 26.1 average 80%
Eucla 19.3 +0.6 27.6 2nd 9.5 +1.3 4.3 14th 32.6 30.2 average 108%
Eyre 19.5 +0.6 27.9 1st 7.0 +0.1 -0.4 27th 91.0 40.0 v high 228%
Forrest 18.8 -0.2 26.5 1st 7.2 +1.2 1.2 15th 38.4 18.5 high 208%
Red Rocks Point 18.7   28.0 1st 9.8   5.3 23rd 67.8
South East (district 12)
Bulga Downs 19.2   25.1 2nd 7.3       45.1 27.4 high 165%
Kalgoorlie-Boulder Airport 17.4 -0.1 23.9 1st 7.8 +1.6 2.8 13th 32.6 28.6 average 114%
Laverton Aero 18.3 0.0 27.1 1st 8.1 +1.3 3.6 13th 41.6 15.4 high 270%
Leinster Aero 19.4 +0.3 27.1 1st 8.4 +1.1 2.1 13th 17.6 16.2 average 109%
Leonora 18.4 -0.6 25.9 1st 8.2 +0.9 3.1 13th 57.0 25.1 v high 227%
Leonora Aero 18.5   26.4 1st 8.3   3.0 23rd 53.0
Munglinup West 18.4   23.7 24th 8.3   5.1 13th 18.2 35.3 low 52%
Norseman                 16.6 30.2 low 55%
Norseman Aero 18.4 +0.4 22.9 1st 6.0 +1.4 -0.7 26th 12.0 14.4 average 83%
Salmon Gums Res.Stn. 18.6 +1.7 23.4 24th 6.2 +0.5 -1.5 6th 14.4 38.3 low 38%
Southern Cross Airfield 18.5 +0.6 23.2 24th 6.7 +2.4 0.7 23rd 18.0 26.9 average 67%
Yeelirrie 20.7 +1.2 27.9 2nd 5.3 +0.6 -1.9 14th        
North East (district 13)
Balgo Hills 24.6 -1.5 29.5 6th 10.9 -1.8 6.0 12th 5.8 9.5 average 61%
Carnegie 21.7 +0.7 27.6 3rd 5.7 -1.4 -0.2 15th 1.7 14.9 average 11%
Giles Meteorological Office 19.7 -0.6 26.5 5th 6.9 -1.2 0.9 13th 23.0 17.6 high 131%
Telfer Aero 24.5 -0.8 29.0 30th 9.5 -2.5 2.1 14th 5.6 12.3 average 46%
Warburton Airfield 20.9 +0.2 26.5 5th 5.1 -1.4 -0.3 15th 11.2 17.9 average 63%
Wiluna 21.3 +1.4     6.6 -0.2     2.1 23.9 low 9%
Offshore Islands (district 200)
Christmas Island Aero 26.6 -0.4 28.0 7th 23.3 +0.1 21.8 20th 55.4 155.8 average 36%
Cocos Island Airport 29.0 +0.5 30.2 10th 25.2 +0.7 23.1 25th 110.6 211.8 low 52%
Varanus Island 24.3 -0.5 27.7 5th 20.4 -0.5 18.9 13th 21.8 16.1 average 135%

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 Friday 1 July 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

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