Western Australia in May 2012: A dry month for WA

  • Rainfall: 5th driest on record for WA; below average for southwest WA
  • Maximum temperature: above average
  • Minimum temperature: 5th coolest on record for WA; near average for southwest WA

Rainfall

Rainfall during May 2012 was below average throughout much of WA, with areas of very much below average rainfall scattered throughout the state. The only area of WA to observe above average rainfall during May 2012 was in the northeast Kimberley; however, monthly totals in this area were less than 10 mm, which reflects the fact that May is typically a dry month in the north of the state. When averaged across the state as a whole, May 2012 rainfall was very much below average and ranked as 5th driest on record. The Lower Southwest (southwest a line from Jurien Bay to Bremer Bay) observed below average rainfall for the month, whilst for the wider Southwest Land Division (SWLD), rainfall averaged across the region during May 2012 was very much below average and ranked as 12th driest on record. Comparable rainfall records commenced in 1900.

A low and trough moved through the southwest of the state from the 3rd to the 6th, bringing the first rainfall for May 2012 for much of the SWLD. On the 5th, showers and thunderstorms were observed through much of western WA, with reports of a tornado on Little Pidgeon Island in the Abrolhos. A cold front moved across the SWLD on the 7th and 8th, bringing further rainfall and some strong gusts to coastal parts of the Southwest and Lower West districts. A westerly flow over the south of the state maintained a few isolated showers in mostly coastal parts of the southwest in subsequent days, before a strong high moved into the Bight on the 11th forcing showers to contract to the south coast. A cold front and low crossed the SWLD on the 13th, with showers and thunderstorms observed in southern and eastern parts of the SWLD and the adjacent southern Goldfields, with reports of large hail to the north of Albany in the South Coastal district. A series of weak cold fronts crossed southern WA from the 14th through to the 18th, with generally light falls near the south coast and showers and thunderstorms in central parts of the state. A strong ridge developed over the south of the state from the 19th, with rainfall contracting to southeast coastal parts, before a very strong high estabilshed in the Bight from the 24th through to the end of the month. A slow moving cold front moved over the western parts of the Southwest District late on the 30th and into central parts of the SWLD on the 31st, with some heavy falls observed in the Southwest district. Cape Leeuwin recorded 67.2 mm in this event, thus registering the highest daily fall in May 2012 in WA.

For the year to date (January to May), the Lower Southwest has observed its 10th driest start to the year on record, and interestingly has seen a drier start to the year than 2010, which was the driest year on record in the region. The dry start to 2012 was primarily due to a very dry autumn which ranked as 7th driest on record.

Maximum temperature

Much of WA saw above to very much above average maximum temperatures in May 2012, though the east Kimberley and northeastern Interior saw below normal daytime temperatures. Mean daily maxima were up to 2 °C warmer thon normal throughout much of WA, away from the northeast and far south, grading to up to 3 °C above average in the west Pilbara, Gascoyne, northern SWLD, and central Interior. Areas up to 3 °C cooler than normal were evident in the east Kimberley. When averaged across the state as a whole, the mean maximum temperature for WA during May 2012 was above average. For the Lower Southwest (southwest a line from Jurien Bay to Bremer Bay), daytime temperatures were also above average. Comparable records commenced in 1950.

Consistently warm temperatures over the northwest of WA throughout much of May 2012, associated with the lack of rainfall and clear skies, resulted in Cararvon Airport, Onslow Airport, Learmonth Airport, and Geraldton Airport Comparison all observing their hottest May on record. Of note were hot days from the 2nd to the 4th where temperatures were up to 10 °C above normal in the west Gascoyne and west Pilbara.

Very much above average mean daily maximum temperatures have been observed through the January to May period in the Lower Southwest, apart form February 2012 which is in fact one of only two months since September 2009 that have seen below average mean maxima. Consequently the region has observed its 6th warmest start to the year on record.

Minimum temperature

May 2012 saw below to very much below average minimum temperatures in the Kimberley, east Pilbara, and northern and eastern Interior, with overnight temperatures up to 3 °C cooler than normal, grading to up to 5 °C cooler than normal in the central Kimberley. Most of central and southern WA reported close to average mean minimum temperatures. When averaged across the state as a whole, the May 2012 mean minimum temperature was very much below average and ranked as 5th coolest on record, whilst the Lower Southwest (southwest a line from Jurien Bay to Bremer Bay) observed near average overnight temperatures. Comparable records commenced in 1950.

Warm overnight conditions were evident across western of WA durnig the first week of May, particularly in on the 3rd to 5th, as a slow moving trough over western parts directed warm northerly winds and cloud over the area. Warm nights were evident in eastern parts of the state from the 8th and 9th as the trough moved eastward through the state. Cold overnight conditions were observed in the western Eucla on the 10th under a developing ridge and Eyre observed -2.0 °C. Cold conditions developed over the south of the state from the 17th through to the end of the month as a ridge developed over the south of WA. A strong high moved over the southwest on the 24th and 25th, resulting in very cold nights in the SWLD and the adjacent southern Goldfields, with a number of sites observing their coldest May night on record. The strong high pushed cool air over the north of the state over the following days, resulting in cold overnight temperatures, particularly in the Kimberley. Broome Airport observed its coolest temperature in 73 years of record on the 28th, whilst Mount Elizabeth observed -0.9 °C on the same morning which was the first recorded sub-zero temperature in May in the Kimberley. Mount Elizabeth broke its May record of 3.7 °C (set on 28 May 1998) on six consecutive days, with minimum temperatures (26th to 31st) of 3.1 °C, 0.5 °C, -0.9 °C, 2.5 °C, 2.8 °C and 1.7 °C respectively.

WA as a whole has observed its 3rd coolest January to May period on record in terms of minimum temperature, with every month so far this year seeing a below average mean minimum. In contrast, above average mean daily minimum temperatures have been observed through the January to April period in the Lower Southwest, with May 2012 being the first month since October 2010 to record a below average monthly minimum. As a result the Lower Southwest has observed its 8th warmest start to the year on record.

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Extremes in May 2012
Hottest day 37.4 °C at Mardie on the 13th
Warmest days on average 33.1 °C at Mardie
Coolest days on average 19.3 °C at Rocky Gully
Coldest day 13.5 °C at Rocky Gully on the 31st
Coldest night -3.4 °C at Wandering on the 25th
Coolest nights on average 5.2 °C at Collie East
Warmest nights on average 24.8 °C at Troughton Island
20.2 °C at Truscott
Warmest night 27.1 °C at Troughton Island on the 5th
27.1 °C at Troughton Island on the 10th
25.0 °C at Onslow on the 6th
Wettest overall 173.0 mm at Cape Leeuwin
Wettest day 67.2 mm at Cape Leeuwin on the 31st
Highest wind gust 106 km/h at Cape Leeuwin on the 7th

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window



Record highest May mean daily maximum temperature
Mean daily maximum
temperature
for May 2012 (°C)
Previous warmest
for May
Years of
record
Average for
May
Geraldton Airport Comparison 26.6 26.3 in 2009 69 24.0
Carnarvon Airport 29.0 28.9 in 1994 64 26.2
Onslow Airport 32.0 31.5 in 2010 46 29.2
Learmonth Airport 30.7 30.5 in 1994 37 28.5



Record lowest May temperature
Lowest temperature
in May 2012 (°C)
Previous coolest
for May
Years of
record
Average for
May
Northam -2.3 on the 25th -2.2 on the 31st in 1964 103 8.4
Broome Airport 7.7 on the 28th 8.4 on the 28th in 1966 73 18.2
Ongerup -0.9 on the 25th 0.1 on the 22nd in 1968 44 8.7
Beverley -1.8 on the 25th -0.6 on the 22nd in 2007 43 7.9
Pingelly 0.4 on the 25th 0.6 on the 30th in 2006 41 8.8
Wagin -0.7 on the 25th 0.4 on the 15th in 1973 38 8.0
Jarrahwood -3.0 on the 24th -2.5 on the 26th in 2006 31 6.9



Summary statistics for May 2012
Maximum temperatures
for May
(°C)
Minimum temperatures
for May
(°C)
Rainfall
for May
(millimetres)
Mean for
May
2012
Diff
from
average
Highest for
May
2012
Mean for
May
2012
Diff
from
average
Lowest for
May
2012
Total for
May
2012
Average
for
May
Rank of
May
2012
Fraction of
May
average
North Kimberley (district 01)
Doongan 29.4 -1.8 32.5 9th 12.3 -2.4 5.1 31st 0 11.5 v low 0%
Kalumburu 31.9 -1.5 34.9 9th 15.3 -1.5 7.6 29th 0.2 18.1 average 1%
Mount Elizabeth 28.9 -1.1 32.7 10th 8.8 -3.4 -0.9 28th 0 13.4 lowest 0%
Troughton Island 30.5 -0.6 32.9 4th 24.8 -0.5 21.2 30th 0.8 40.5 average 2%
Truscott 30.8   33.0 2nd 20.5   14.2 29th 0.2
Wyndham 31.6 -1.9 35.1 2nd 17.7 -2.9 11.0 30th 0 8.4 lowest 0%
Wyndham Aero 32.4 -1.5 36.1 2nd 17.3 -1.7 9.6 27th 0 11.0 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 30.1 -1.7 33.7 11th 16.4 -2.5 9.9 30th 0 8.7 v low 0%
Halls Creek Airport 27.8 -2.1 32.0 11th 13.7 -3.0 9.1 26th 0 12.8 lowest 0%
Kununurra Aero 31.4 -1.4 35.1 2nd 16.0 -2.9 8.6 30th 1.2 7.1 average 17%
Warmun 30.2 -2.0 34.5 10th 15.8 -1.4 8.0 27th 0 10.4 lowest 0%
West Kimberley (district 03)
Bidyadanga 32.7 +0.3 37.0 13th 16.5 -1.9 10.2 27th 0 25.0 lowest 0%
Broome Airport 31.3 -0.2 35.6 11th 15.1 -3.1 7.7 28th 0.2 26.0 average 1%
Curtin Aero 32.4 -0.8 36.7 10th 16.4 -2.8 9.0 26th 0 12.2 v low 0%
Cygnet Bay 29.6 -1.4 33.0 22nd 17.2 -1.8 11.5 21st 0 38.5 lowest 0%
Derby Aero 31.9 -0.8 35.4 13th 15.8 -3.1 9.4 26th 0 17.8 lowest 0%
Fitzroy Crossing Aero 31.6 -1.5 35.6 11th 12.1 -3.8 6.0 28th 0 7.3 v low 0%
West Roebuck 32.2 -0.8 36.1 11th 13.1 -2.9 5.5 27th 0 10.1 v low 0%
De Grey (district 04)
Bedout Island 28.8   31.0 13th        
Karratha Aero 31.1 +1.1 35.7 1st 16.8 -1.3 10.8 31st 0 24.4 lowest 0%
Legendre Island 28.6   32.1 8th 21.5   16.9 31st
Mandora 32.1 +0.1 36.8 10th         0 24.7 lowest 0%
Marble Bar 31.2 0.0 35.6 11th 14.9 -2.2 9.5 27th 0 8.5 v low 0%
Port Hedland Airport 31.4 +0.8 36.3 11th 15.2 -2.0 8.3 25th 0 27.0 lowest 0%
Roebourne 32.3 +1.9 37.0 12th 17.1 -1.2 11.7 31st 0 27.6 lowest 0%
Roebourne Aero 32.3 +0.5 36.9 12th 14.7 -2.1 7.9 31st 0 15.7 v low 0%
Fortescue (district 05)
Barrow Island Airport 28.4 +1.0 31.9 12th 20.6 -0.6 16.3 28th 0 56.7 v low 0%
Learmonth Airport 30.7 +2.2 35.3 10th 14.6 -1.6 8.3 31st 2.2 40.3 low 5%
Mardie 33.1 +1.6 37.4 13th 15.5 -1.4 9.6 31st 0 36.6 lowest 0%
Onslow 31.2 +2.3 35.2 9th 17.9 +1.6 11.5 29th 0 45.5 lowest 0%
Onslow Airport 32.0 +2.8 36.5 12th 17.1 -0.2 11.6 25th 0.4 50.9 v low 1%
Wittenoom 29.4 +1.6 33.8 7th 15.7 -0.4 10.5 26th 0 27.2 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 29.0 +2.8 35.4 12th 14.2 -0.7 7.7 27th 0.4 35.2 v low 1%
Denham         17.5 +1.1 11.5 31st 2.0 37.5 low 5%
Emu Creek Station         15.4 -0.7 8.9 31st 0 35.1 lowest 0%
Murchison 28.2 +2.2 34.0 13th 10.3 -1.1 3.1 27th 0 18.5 v low 0%
Shark Bay Airport 29.3 +1.9 35.9 12th 14.4 -0.3 7.2 31st 0.6 23.6 v low 3%
East Gascoyne (district 07)
Newman Aero 28.1 +1.0 32.3 12th 11.2 -0.5 2.6 31st 0 17.3 lowest 0%
Paraburdoo Aero 30.0 +0.9 34.2 11th 14.0 -0.6 5.3 31st 0 16.4 lowest 0%
Murchison (district 07A)
Meekatharra Airport 25.7 +2.0 30.9 14th 12.9 +0.8 6.2 24th 2.8 22.6 low 12%
Mount Magnet Aero 25.4 +1.5 31.4 3rd 11.5 -0.3 4.5 24th 6.0 17.1 average 35%
Paynes Find 24.5 +1.3 31.2 13th 9.0 -0.5 1.8 24th 20.6 37.7 average 55%
North Coast (district 08)
Carnamah 24.5 +1.9 30.8 3rd 11.2 +0.4 6.0 24th 9.5 51.1 low 19%
Dalwallinu 23.7 +1.5 30.5 3rd 9.4 -0.8 4.0 24th        
Dalwallinu Comparison 23.8 +2.0 30.4 3rd 10.4 +0.2 5.2 25th 7.5 45.4 v low 17%
Eneabba 26.6 +2.3 34.0 2nd 12.7 +0.4 7.5 24th 0 69.1 lowest 0%
Geraldton Airport 26.8   35.1 2nd 12.4   7.8 27th 11.6
Geraldton Airport Comparison 26.6 +2.6 34.8 2nd 12.6 -0.3 8.5 25th 17.4 69.3 low 25%
Kalbarri 27.9 +2.0 35.0 12th 13.4 +0.1 7.2 22nd 11.9 57.3 v low 21%
Morawa Airport 25.3 +1.1 31.3 12th 9.4 -1.3 2.5 24th 10.2 37.9 low 27%
Mullewa 26.1 +2.4 32.1 2nd 12.0 +0.8 6.1 24th 15.8 46.9 low 34%
North Island 25.2 +0.7 29.4 2nd 19.5 +0.9 12.5 30th 14.6 44.7 low 33%
Wongan Hills 23.6 +2.1 29.8 3rd 9.9 0.0 3.5 25th 20.1 52.5 low 38%
Central Coast (district 09)
Badgingarra Research Stn 24.3 +1.8 30.8 2nd 11.5 +0.9 6.7 25th        
Bickley 19.9 +0.4 24.1 3rd 10.3 +0.1 5.2 25th 61.4 128.7 low 48%
Champion Lakes 22.2   26.0 2nd 12.7   6.5 25th 44.6
Garden Island HSF 21.7 +0.1 26.5 2nd 13.8 -0.2 8.6 25th 67.2 72.7 average 92%
Gingin Aero 23.6 +0.7 28.6 2nd 9.2 -0.1 0.2 25th 30.0 74.7 v low 40%
Gosnells City 23.7 +0.9 27.2 2nd         33.6 103.1 v low 33%
Jandakot Aero 22.7 +0.6 26.5 2nd 9.0 -0.4 -0.6 25th 53.6 106.3 low 50%
Jurien Bay 25.1 +1.9 32.0 2nd 11.5 -0.3 4.0 24th 47.0 78.0 low 60%
Karnet 20.0 +0.8 24.2 20th 9.0 -0.1 1.1 25th 106.6 139.4 average 76%
Lancelin 24.6 +2.0 31.0 2nd 12.6 +0.2 5.9 24th 26.4 83.1 v low 32%
Medina Research Centre 23.0 +0.9 27.1 3rd 10.7 +0.2 2.7 25th 92.0 97.5 average 94%
Pearce RAAF 23.3 +1.4 28.2 2nd 10.7 -0.1 1.6 24th 23.6 84.4 v low 28%
Perth Airport 23.0 +1.3 27.1 2nd 10.2 -0.2 3.7 26th 36.6 99.2 low 37%
Perth Metro* 23.1 +0.7 27.3 2nd 10.4 -0.3 1.3 25th 49.0 117.3 low 42%
Rottnest Island 21.8 +0.7 25.8 3rd 15.6 +0.3 12.4 24th 45.2 69.5 average 65%
Swanbourne 23.2 +0.9 27.4 2nd 12.6 0.0 6.6 25th 56.4 87.7 low 64%
South Coast (district 09A)
Albany 19.9 +1.3 24.6 5th 11.6 +0.9 5.0 24th 92.5 117.2 average 79%
Albany Airport 19.9   24.0 5th 9.4   2.2 24th 79.8
Bridgetown 20.1 +0.3 25.1 3rd 5.7 -1.2 -2.2 24th 69.0 97.5 average 71%
Bridgetown Comparison 20.9 +1.6 25.0 3rd 5.8 -0.7 -1.3 25th 61.8 109.2 low 57%
Bunbury 21.4 +0.3 25.8 2nd 8.3 -1.1 -0.1 25th 96.4 91.9 average 105%
Busselton Aero 21.0 +0.3 25.4 3rd 7.9 -1.4 0.4 25th 41.6 96.4 v low 43%
Cape Leeuwin 20.7 +1.5 25.6 3rd 14.3 +0.6 9.0 24th 173.0 138.4 high 125%
Cape Naturaliste 20.9 +1.7 26.3 3rd 13.0 +0.4 9.0 24th 46.2 114.8 v low 40%
Collie East 20.4   26.1 3rd 5.2   -3.1 25th 65.0 85.6 average 76%
Donnybrook 21.5 +1.5 26.8 3rd 8.4 +0.2 2.3 24th 83.4 133.8 low 62%
Dwellingup 19.9 +1.4 24.3 3rd 7.5 -0.2 -1.2 25th 114.8 156.4 average 73%
Esperance 20.7 +0.2 25.9 31st 10.7 -0.3 6.5 28th 52.4 70.7 average 74%
Esperance Aero 20.2 0.0 24.5 31st 9.9 -0.7 5.6 28th 38.0 66.6 low 57%
Harvey 21.5 0.0 26.2 3rd 9.8 -0.8 3.5 25th 87.0 106.4 average 82%
Hopetoun North 20.9 -0.6 26.1 13th 10.5 -0.1 4.3 29th 34.4 44.5 average 77%
Jarrahwood 21.0 +1.1 25.2 3rd 5.3 -1.6 -3.0 24th 72.4 123.5 low 59%
Mandurah 21.7 +0.4 26.2 2nd 13.5 -0.1 6.9 25th 76.2 92.9 average 82%
Manjimup 19.6 +2.0 24.7 3rd 9.0 +0.1 3.8 25th 51.2 130.1 v low 39%
North Walpole 19.6   25.4 3rd 11.1   4.9 24th 127.6
Pemberton 19.7 +1.6 24.0 3rd 9.7 +0.3 3.9 24th 96.4 149.4 low 65%
Rocky Gully 19.3 +0.6 26.2 3rd 8.8 -0.6 2.2 24th 47.0 71.8 low 65%
Windy Harbour 20.3 +0.4 25.6 3rd 10.7 0.0 4.0 24th 156.8 140.6 high 112%
Witchcliffe 20.0 +0.1 25.4 3rd 8.8 -1.0 0.6 24th 122.6 129.2 average 95%
North Central (district 10)
Bencubbin 22.7 +1.9 29.2 3rd 9.2 +0.1 2.6 24th 15.8 37.1 low 43%
Cunderdin Airfield 23.3 +1.4 29.9 3rd 7.3 -1.2 -1.2 25th 15.0 30.2 low 50%
Kellerberrin 23.0 +2.2 29.0 3rd 7.9 -0.4 -0.5 24th 10.8 41.8 low 26%
Merredin 23.0 +2.4 29.0 3rd 8.5 -0.4 1.0 25th 10.6 40.9 low 26%
Northam 23.4 +2.2 29.3 3rd 7.5 -0.9 -2.3 25th 17.6 55.3 low 32%
York 23.0 +1.0 29.5 3rd 5.6 -1.5 -3.0 25th 22.6 42.5 low 53%
South Central (district 10A)
Beverley 22.9 +1.5 29.6 3rd 7.3 -0.6 -1.8 25th 25.8 53.7 low 48%
Brookton 21.6 +1.1 27.9 3rd 7.7 0.0 -1.5 25th 36.4 57.0 average 64%
Corrigin 21.1 +1.4 27.5 3rd 6.9 -0.7 -2.0 25th 15.6 47.2 low 33%
Hyden 22.2 +1.4 28.3 13th 7.2 -0.4 -1.6 25th 20.8 39.0 low 53%
Katanning 19.7 +0.2 26.9 3rd 8.2 -0.7 0.8 24th 39.4 45.0 average 88%
Katanning Comparison 20.0 +1.5 27.0 3rd 6.9 -1.0 -1.0 24th 36.6 59.6 low 61%
Lake Grace 20.3 0.0 25.9 3rd 8.4 -0.5 0.2 25th 35.0 27.7 average 126%
Lake Grace Comparison 20.4 +0.7 26.1 3rd 8.5 -0.1 0.5 25th 33.8 43.0 average 79%
Narembeen 22.4 +1.4 26.5 13th 7.9 -0.3 0.7 25th 21.6 39.6 low 55%
Narrogin 20.2 +1.7 26.6 3rd 7.3 -0.6 -1.0 25th 42.6 62.7 average 68%
Newdegate Research Station 20.7 +0.6 26.3 13th 5.7 -1.6 -2.3 25th
Ongerup 19.9 +1.0 25.0 13th 8.2 -0.5 -0.9 25th 36.6 43.8 average 84%
Pingelly 21.0 +1.4 27.7 3rd 8.4 -0.4 0.4 25th 34.2 57.6 low 59%
Ravensthorpe 20.7 +0.6 24.8 13th 9.6 0.0 4.5 25th 24.1 44.0 low 55%
Wagin 20.0 +0.5 26.8 3rd 7.0 -1.0 -0.7 25th 49.2 54.3 average 91%
Wandering 20.2 -0.1 26.5 3rd 6.0 -0.4 -3.4 25th 60.2 49.4 average 122%
Eucla (district 11)
Balladonia 21.8 +0.9 25.5 7th 8.1 +0.1 0.4 31st 3.8 26.2 low 15%
Eucla 21.5 +0.4 30.8 6th 9.8 -0.7 4.4 31st 18.4 31.0 low 59%
Eyre 22.5 +1.2 29.0 15th 6.7 -2.5 -2.0 10th 35.8 38.7 average 93%
Forrest 22.6 +0.4 29.8 5th 7.2 -1.6 0.0 31st 7.6 17.5 low 43%
Red Rocks Point 21.3   28.9 6th 10.6   5.5 31st 11.0
South East (district 12)
Bulga Downs 25.4   31.0 5th 9.4   1.7 31st        
Kalgoorlie-Boulder Airport 21.8 +1.2 27.1 14th 8.8 +0.1 2.1 25th 12.2 26.1 average 47%
Laverton Aero 23.2 +1.1 28.8 14th 10.2 -0.3 3.1 25th 12.8 13.7 average 93%
Leinster Aero 23.7 +0.6 29.9 14th 10.5 -0.2 3.2 26th 12.2 15.7 average 78%
Leonora 23.3 +0.5 30.2 5th 9.5 -0.7 2.9 25th 2.2 23.9 low 9%
Leonora Aero 23.7   30.2 5th 9.5   2.0 31st 2.0
Munglinup West 20.6 -0.3 25.9 13th 8.9 -1.0 4.8 25th 22.4 40.5 low 55%
Norseman Aero 21.3 +0.2 27.4 14th 6.4 -0.7 -1.1 25th 5.4 18.6 low 29%
Salmon Gums Res.Stn. 20.7 +0.9 24.9 14th 5.5 -1.7 -1.4 29th 13.4 34.1 low 39%
Southern Cross Airfield 22.2 +0.7 29.0 13th 6.7 -0.8 -1.0 25th 14.2 30.2 low 47%
Yeelirrie 24.2 +0.7 30.5 14th 8.3 +0.1 -0.7 31st 22.8 24.8 average 92%
North East (district 13)
Balgo Hills 27.7 -1.5 33.1 11th 13.5 -2.3 8.5 27th 0 15.3 lowest 0%
Carnegie 26.8 +1.6 31.7 14th 10.7 0.0 2.6 31st 0 15.5 lowest 0%
Giles Meteorological Office 25.3 +1.7 31.7 9th 8.9 -2.4 1.9 24th 0 19.1 lowest 0%
Telfer Aero 30.2 +1.1 35.0 11th 14.1 -1.2 7.3 31st 0 18.5 lowest 0%
Warburton Airfield 25.9 +1.6 32.4 7th 10.0 -0.4 1.6 23rd 0 15.2 lowest 0%
Wiluna 25.1 +1.3 31.5 14th 9.7 -0.3 1.5 31st 23.5 25.2 average 93%
Offshore Islands (district 200)
Christmas Island Aero 27.5 -0.3 28.4 2nd 24.0 +0.2 21.9 15th        
Cocos Island Airport 29.9 +0.7 31.0 19th 25.9 +0.9 22.5 21st 88.8 192.3 low 46%
Varanus Island 28.7 +0.7 31.8 2nd 23.9 +0.3 20.0 25th 0 29.8 v low 0%

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 June 2012. 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

Media
(03) 9669 4057
Enquiries