Western Australia in May 2013: warm nights and above average rainfall

  • Rainfall: above average for WA; near average for southwest WA
  • Maximum temperature: near average for WA
  • Minimum temperature: 9th warmest on record for WA

Rainfall

Rainfall during May 2013 was above to very much above average in the Kimberley and much of the Pilbara and Northern Interior, as well as parts of the Southern Interior, Goldfields, Gascoyne, Southwest, Southeast Coastal, and west Eucla. Theda and Camballin in the Kimberley, and Balladonia in the western Eucla recorded their wettest May on record, largely due to rainfall events toward the middle and second half of the month. For the remainder of the State, May rainfall was generally close to average.

Averaged across the state as a whole, rainfall during May 2013 was above average. For the Southwest Land Division (SWLD) and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), May 2013 rainfall was close to, but slightly above, the May average, resulting in their first 'above average' May since 2005.

May 2013 started with a cloudband moving through the SWLD and the adjacent Gascoyne, Goldfields, and Eucla from the 1st to the 3rd, producing widespread rainfall and isolated thunderstorms with moderate to heavy falls recorded in the Southwest and southern parts of the Lower West.

A strong cold front moved across western WA during the evening of the 7th and morning of the 8th, resulting in thunderstorms, severe wind gusts, and widespread rainfall in western, central and southern WA. The heaviest falls were observed in the Southwest and Lower West districts with daily totals mostly in the 30 mm to 90 mm range, while moderate daily totals extended into the Central West, Gascoyne and west Pilbara. A very heavy fall of 100.8 mm in the 24 hours to 9am on the 8th at Aston Downs Alert (Southwest) was the highest daily total at the site in 10 years of record, and the highest daily total for May 2013 in the SWLD, while numerous other sites with mostly short periods of record observed their wettest May day on record. The cold front weakened and moved through southeastern WA on the 9th resulting in moderate rainfall in the Goldfields and Eucla, while two fronts passed the SWLD in succession on the 9th and the 10th, bringing further showers and isolated thunderstorms, severe winds gusts and moderate rainfall to the Southwest.

A cloudband associated with a cold front over southeast Australia produced rain and isolated thunderstorms with moderate rainfall in the Kimberley on the 12th and early on the 13th, whilst a middle level trough brought widespread rainfall to the Pilbara and west Kimberley on the 14th and 15th, with thunderstorms and heavy falls in the west Kimberley on the 15th. Storms persisted in the Kimberley to the 24th with further heavy falls reported. Very heavy rainfall in excess of 150 mm was reported on the northern Dampier Penninsula on the 19th and 20th as Cygnet Bay observed 155.4 mm in the 24 hours to 9am on the 21st, its wettest May day in 50 years of record. Lombadina Airstrip reported 182.5 mm on the 21st, the highest daily total in WA for May 2013.

Showers and thunderstorms produced moderate to heavy rainfall in the west Pilbara on the 26th and the 27th, causing localised flash flooding around Exmouth where a daily fall of 106.0 mm was reported at Exmouth Town in the 24 hours to 9am on the 27th.

A cold front moved across the southwest of WA overnight on the 29th and moved through central and southeastern WA on the 30th and 31st, bringing thunderstorms and moderate to heavy rainfall to western and southern parts of the SWLD. Particularly heavy falls were observed along the Southeast Coastal coast, with Esperance and Mt Howick observing their wettest May day in 44 and 40 years of record respectively with daily totals near 50 mm.

Maximum temperature

Much of WA recorded near average maximum temperatures in May 2013. Above to very much above average mean maximum temperatures were observed in most of the Kimberley, Southern Interior, and Eucla, with an area up to 4 °C warmer than normal in the eastern Eucla. Below average mean maximum temperatures were mainly confined to small areas in the the west Pilbara, inland Gascoyne, and Northern Interior.

Averaged across the state as a whole, the mean maximum temperature for May was near average for both WA and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay).

During the first eight days of the month, unusually warm days were experienced in various locations in northern, central, and southeastern WA with daily maxima reaching the high thirties at times due to a number of slow moving troughs directing hot northerly winds over much of WA. Onslow Airport in the west Pilbara recorded a maximum of 38.8 °C on the 1st, its hottest May day in 48 years of record. Forrest in the Eucla district recorded a maximum temperature of 36.8 °C on the 2nd breaking its previous highest May temperature in 83 years of record of 36.6 °C on 3 May 1990, whilst Eucla town recorded a maximum temperature of 36.5 °C on both the 2nd and 8th, exceeding its previous highest May temperature (36.3 °C) in 52 years of record. Numerous other sites with shorter periods of record also registered their highest May temperature. Mandora in the west Kimberley recorded the highest temperature in WA in May with a maximum of 39.2 °C on the 6th.

In the last two days of the month, a strong cold front and a pool of cold air moved over southern WA and, along with cloud and rain, caused very low temperatures in the SWLD. Maximum temperatures below 10 °C were observed at a number of sites on the 30th as Jacup and Manjimup observed the lowest maximum temperature of the month in WA with 9.4 °C, and Ongerup registered its lowest maximum temperature in May in 48 years of record with 9.8 °C.

Minimum temperatures

Most of WA was above to very much above average in terms of mean minimum temperatures during May 2013, with means up to 3 °C warmer than normal in the west and central Kimberley and Southern Interior, grading to 4 °C warmer than normal in parts of the Eucla. Large parts of western WA saw near average overnight temperatures, with a small area below average in the west Gascoyne.

Averaged across the state as a whole, the mean minimum temperature for May 2013 was the 9th warmest since comparable records commenced in 1910. Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean minimum temperature in May 2013 was above average.

Warm northerly winds and cloud resulted in some very warm nights in northern, central, and eastern parts of WA during the first eleven days of the month. Balladonia in the western Eucla recorded a minimum temperature of 18.8 °C on the 2nd, which exceeded its previous May record of 17.5 °C set on 13 May 1972. Mardie in the Pilbara recorded a minimum of 25.1 °C on the 8th, its warmest May night in 56 years of record, whilst Giles in the Southern Interior recorded a minimum of 23.3 °C on the 9th, its warmest May night in 57 years of record.

A cold morning was experienced across the SWLD on the last day of May 2013 as mimimum temperatures dropped to below 5 °C at numerous sites and a number of sites registered sub-zero temperatures. A minimum of 3.3 °C at Lancelin (Lower West) on the 31st was its lowest May temperature in 46 years of record, whilst Collie East recorded a minimum of -0.6 °C, the lowest temperature recorded in WA in May 2013.

Further information

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Extremes in May 2013
Hottest day 39.2 °C at Mandora on the 6th
Warmest days on average 34.9 °C at Wyndham Aero
Coolest days on average 18.1 °C at Rocky Gully
Coldest day 9.4 °C at Jacup on the 30th
9.4 °C at Manjimup on the 30th
Coldest night -0.6 °C at Collie East on the 31st
Coolest nights on average 6.3 °C at Jarrahwood
Warmest nights on average 26.4 °C at Troughton Island
Warmest night 28.2 °C at Troughton Island on the 5th
27.7 °C at Karratha Aero on the 8th
Wettest overall 276.4 mm at Mount William
Wettest day 182.5 mm at Lombadina Airstrip on the 21st
Highest wind gust 109 km/h at Cape Leeuwin on the 8th

Maps

Maps
Observed Anomaly Decile 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

Record highest May daily rainfall
Highest daily rainfall
in May 2013 (mm)
Previous wettest
for May
Years of
record
Cygnet Bay 155.4 on the 21st 124.0 on the 13th in 1997 50
Esperance 55.8 on the 31st 51.3 on the 23rd in 1971 44
Mount Howick 46.6 on the 31st 39.8 on the 5th in 1974 40



Record highest total May rainfall
Total rainfall
for May 2013 (mm)
Previous wettest
for May
Years of
record
Average for
May
Balladonia 118.7 96.8 in 1986 103 27.1
Theda 190.8 157.8 in 2010 46 21.8
Camballin 81.6 75.0 in 1970 39 15.7




Record highest May temperature
Highest temperature
in May 2013 (°C)
Previous warmest
for May
Years of
record
Average for
May
Eucla 36.5 on the 8th 36.3 on the 3rd in 1990 52 21.1
Onslow Airport 38.8 on the 1st 38.4 on the 1st in 2010 48 29.2



Record lowest May daily maximum temperature
Lowest daily maximum
temperature
in May 2013 (°C)
Previous coolest
for May
Years of
record
Average for
May
Ongerup 9.5 on the 30th 10.0 on the 1st in 1968 45 18.9



Record highest May daily minimum temperature
Highest daily minimum
temperature
in May 2013 (°C)
Previous warmest
for May
Years of
record
Average for
May
Giles Meteorological Office 23.3 on the 9th 23.2 on the 13th in 1958 57 11.3
Mardie 25.1 on the 8th 25.0 on the 27th in 1998 56 16.9
Balladonia 18.8 on the 2nd 17.5 on the 13th in 1972 47 8.0



Record lowest May temperature
Lowest temperature
in May 2013 (°C)
Previous coolest
for May
Years of
record
Average for
May
Lancelin 3.3 on the 31st 3.9 on the 25th in 1979 46 12.5



Summary statistics for May 2013
Maximum temperatures
for May
(°C)
Minimum temperatures
for May
(°C)
Rainfall
for May
(millimetres)
Mean for
May
2013
Diff
from
average
Highest for
May
2013
Mean for
May
2013
Diff
from
average
Lowest for
May
2013
Total for
May
2013
Average
for
May
Rank of
May
2013
Fraction of
May
average
North Kimberley (district 01)
Doongan 31.6 +0.5 35.2 6th 17.6 +3.0 9.4 27th 108.0 15.5 v high 697%
Kalumburu 33.9 +0.6 36.9 3rd 19.8 +3.1 12.4 26th 24.0 18.5 high 130%
Mount Elizabeth 30.9 +1.0 34.8 5th 15.8 +3.8 7.6 27th 67.7 14.7 v high 461%
Troughton Island 31.4 +0.3 33.8 2nd 26.4 +1.1 23.6 21st 145.8 44.3 high 329%
Truscott 32.2   35.4 6th 22.9   17.1 26th 43.0 31.9 high 135%
Wyndham 34.2 +0.7 37.9 3rd 22.0 +1.4 13.6 26th 7.2 8.4 high 86%
Wyndham Aero 34.9 +1.1 38.3 4th 21.8 +2.9 12.8 26th 4.8 10.8 average 44%
East Kimberley (district 02)
Argyle Aerodrome 33.1 +1.4 37.5 6th 20.9 +2.1 13.8 27th 25.0 9.3 high 269%
Halls Creek Airport 30.7 +0.8 36.5 5th 18.0 +1.3 11.7 27th 19.0 12.8 high 148%
Kununurra Aero 34.1 +1.4 37.5 6th 20.1 +1.3 11.3 27th 0.4 7.0 average 6%
Warmun 32.9 +0.7 37.9 4th 18.7 +1.5 11.0 27th 7.0 10.4 high 67%
West Kimberley (district 03)
Bidyadanga 32.6 +0.2 38.7 5th 19.5 +1.2 15.1 16th 56.8 25.2 high 225%
Broome Airport 31.6 +0.1 36.6 1st 20.2 +2.0 15.0 27th 116.6 27.3 v high 427%
Curtin Aero 33.6 +0.4 38.7 5th 19.3 +0.3 13.3 28th 79.6 15.7 v high 507%
Cygnet Bay 31.1 +0.1 35.4 5th 21.5 +2.5 15.4 30th 241.4 42.5 v high 568%
Derby Aero 32.7 0.0 38.3 4th 20.2 +1.4 14.3 26th 117.8 19.5 v high 604%
Fitzroy Crossing Aero 33.3 +0.3 38.5 6th 17.9 +2.3 10.1 26th 70.0 11.3 v high 619%
West Roebuck 32.3 -0.6 38.3 6th 19.7 +3.9 13.0 26th 128.6 18.6 v high 691%
De Grey (district 04)
Karratha Aero 29.3 -0.8 37.6 1st 19.5 +1.4 14.8 15th 54.8 25.2 high 217%
Legendre Island 28.0   34.1 7th 22.2   15.7 15th
Mandora 32.0 0.0 39.2 6th 18.2 +1.4 13.0 3rd 14.4 24.6 average 59%
Marble Bar 29.5 -1.7 37.9 7th 17.8 +0.9 13.5 16th 72.4 13.4 v high 540%
Port Hedland Airport 30.4 -0.2 37.7 1st 19.0 +1.8 13.3 23rd 46.8 27.2 high 172%
Roebourne 30.7 +0.2 38.5 7th 19.1 +0.8 14.4 15th 30.0 27.6 high 109%
Fortescue (district 05)
Barrow Island Airport 26.8 -0.7 33.8 7th 21.5 +0.3 17.8 15th 37.0 55.4 average 67%
Learmonth Airport 27.4 -1.2 36.6 1st 16.6 +0.4 11.4 23rd 71.2 40.8 high 175%
Mardie 30.6 -0.9 38.9 1st 18.3 +1.4 12.4 21st
Onslow Airport 29.1 -0.1 38.8 1st 18.4 +1.1 13.5 15th 28.0 50.4 average 56%
Wittenoom 28.0 +0.2 35.9 7th 16.7 +0.6 10.8 22nd 15.8 27.0 average 59%
West Gascoyne (district 06)
Carnarvon Airport 26.3 +0.1 30.8 1st 14.1 -0.8 9.1 31st 11.4 34.9 average 33%
Denham 24.9 -0.9 29.4 7th 16.1 -0.4 8.0 31st 29.6 37.5 average 79%
Emu Creek Station 28.4 -1.6 38.5 1st 16.4 +0.4 12.0 15th 45.7 35.3 high 129%
Murchison 24.3 -1.8 34.0 1st 10.5 -0.8 4.5 31st 9.2 18.1 average 51%
Shark Bay Airport 26.1 -1.5 33.1 5th 14.4 -0.3 10.0 23rd 38.4 24.8 high 155%
East Gascoyne (district 07)
Newman Aero 26.7 -0.5 35.5 1st 13.4 +1.8 7.7 16th 10.4 17.1 average 61%
Paraburdoo Aero 27.8 -1.4 37.0 1st 15.0 +0.4 8.6 16th 23.6 16.6 high 142%
Murchison (district 07A)
Meekatharra Airport 23.2 -0.6 34.9 1st 11.9 -0.2 5.5 31st 35.6 22.8 high 156%
Mount Magnet Aero 23.5 -0.5 35.1 1st 11.7 -0.1 5.1 31st 20.0 17.2 high 116%
Paynes Find 23.7 +0.5 33.5 6th 10.9 +1.4 3.2 23rd 32.6 37.6 average 87%
North Coast (district 08)
Carnamah 21.9 -0.7 30.7 1st 11.3 +0.5 4.4 31st 70.1 51.2 high 137%
Dalwallinu 20.8 -1.5 29.2 1st 9.7 -0.4 3.8 31st 46.0 36.7 high 125%
Geraldton Airport 23.7   29.0 5th 12.5   5.6 31st 77.6
Geraldton Airport Comparison 23.7 -0.4 29.6 5th 12.7 -0.2 5.2 31st 77.6 69.4 average 112%
Kalbarri 25.4 -0.6 31.1 5th 13.0 -0.3 7.3 22nd 52.0 57.2 average 91%
Morawa Airport 22.4 -1.9 31.0 1st 10.7 +0.1 4.8 31st 79.2 40.4 high 196%
Mullewa 23.0 -0.7 31.0 5th 11.7 +0.5 6.0 31st 61.0 47.1 high 130%
North Island 23.7 -0.8 26.9 1st 17.3 -1.4 11.4 1st 75.0 47.2 high 159%
Wongan Hills 20.7 -0.9 27.8 1st 10.3 +0.4 2.5 31st 56.8 52.6 average 108%
Central Coast (district 09)
Badgingarra Research Stn 20.4 -2.2 27.8 1st 10.4 -0.3 4.4 31st 116.0 70.6 high 164%
Bickley 18.4 -1.1 23.8 1st 10.0 -0.2 3.9 31st 189.6 130.0 high 146%
Champion Lakes 20.9   25.4 1st 12.0   3.9 31st 124.2
Garden Island HSF 20.6 -1.0 23.8 7th 13.7 -0.3 9.2 31st 150.8 79.2 high 190%
Gingin Aero 21.4 -1.6 26.9 1st 9.0 -0.3 -0.4 31st 78.0 74.9 average 104%
Gosnells City 21.9 -1.0 26.8 1st 11.3 -0.5 3.0 31st 141.3 103.8 high 136%
Jandakot Aero 21.3 -0.8 25.2 1st 9.1 -0.3 0.5 31st 164.2 107.7 high 152%
Jurien Bay 22.7 -0.6 26.9 5th 12.5 +0.7 8.0 21st 101.3 78.5 high 129%
Karnet 18.8 -0.4 22.8 1st 9.0 -0.1 2.7 31st 177.0 140.1 high 126%
Lancelin 22.3 -0.4 26.0 5th 11.6 -0.9 3.3 31st 98.4 83.5 average 118%
Medina Research Centre 21.9 -0.2 26.3 1st 10.4 -0.1 2.1 31st 134.6 98.7 high 136%
Pearce RAAF 21.8 -0.2 27.8 1st 10.3 -0.5 0.6 31st 93.0 84.7 average 110%
Perth Airport 21.7 -0.1 26.9 1st 10.6 +0.2 1.6 31st 108.2 99.4 average 109%
Perth Metro 21.5 -1.0 25.7 1st 10.6 +0.1 3.5 31st 138.2 116.8 average 118%
Rottnest Island 20.5 -0.7 24.2 1st 14.8 -0.5 9.6 31st 170.4 100.4 high 170%
Swanbourne 21.9 -0.4 25.5 5th 12.3 -0.3 5.0 31st 152.2 91.0 v high 167%
South Coast (district 09A)
Albany 19.4 +0.8 23.3 8th 11.7 +1.0 6.7 29th 97.5 117.1 average 83%
Albany Airport Comparison 19.0 0.0 23.7 7th 9.7 -0.1 3.5 29th
Bridgetown 18.7 -1.2 23.1 7th 6.6 -0.2 -0.1 31st 149.6 100.8 high 148%
Busselton Aero 19.7 -1.0 23.0 3rd 9.1 -0.1 4.5 31st 205.6 103.6 v high 198%
Cape Leeuwin 19.8 +0.6 23.5 7th 13.7 0.0 9.8 31st 224.4 139.1 high 161%
Cape Naturaliste 19.9 +0.7 23.4 7th 12.5 -0.1 6.9 31st 160.2 115.2 high 139%
Collie East 19.2 -1.1 22.8 1st 6.6 +0.5 -0.6 31st
Donnybrook 20.1 +0.1 24.0 7th 8.8 +0.6 0.6 31st 196.5 134.4 high 146%
Dwellingup 18.8 +0.3 22.4 26th 8.2 +0.5 2.0 31st 247.2 157.4 high 157%
Esperance 20.2 -0.3 27.8 1st 12.1 +1.1 6.8 25th 115.0 71.7 high 160%
Esperance Aero 20.3 +0.1 29.0 1st 11.0 +0.4 6.5 14th 68.6 66.6 average 103%
Harvey 20.5 -1.0 23.5 1st 10.2 -0.3 1.5 31st 202.7 113.8 high 178%
Jarrahwood 19.8 -0.2 22.8 26th 6.3 -0.5 0.2 31st 218.4 126.1 v high 173%
Mandurah 20.6 -0.7 24.6 5th 13.4 -0.2 8.0 31st 112.0 94.5 average 119%
Manjimup 18.2 +0.5 22.6 7th 9.1 +0.2 3.2 31st 181.0 130.7 high 138%
North Walpole 18.9   23.5 7th 10.7   6.9 19th 219.6
Pemberton 18.8 +0.6 22.3 26th 9.6 +0.2 4.9 31st 261.1 151.0 v high 173%
Rocky Gully 18.1 -0.7 22.3 7th 9.0 -0.4 3.8 29th 60.6 71.2 average 85%
Windy Harbour 19.6 -0.3 24.6 7th 10.5 -0.2 3.5 26th 192.2 142.4 high 135%
Witchcliffe 19.2 -0.7 21.9 7th 8.8 -0.9 3.9 26th 253.6 137.5 v high 184%
North Central (district 10)
Bencubbin 20.9 0.0 30.6 6th 10.1 +0.9 4.1 31st 23.0 37.0 average 62%
Cunderdin Airfield 20.8 -1.2 29.5 1st 9.7 +1.3 3.5 23rd 42.6 31.0 average 137%
Kellerberrin 21.1 +0.3 30.0 1st 8.5 +0.2 2.5 24th 52.0 41.9 average 124%
Merredin 21.1 +0.4 29.3 1st 9.8 +0.9 3.7 31st 31.4 40.8 average 77%
Northam 21.1 -0.2 28.4 1st 9.2 +0.8 3.0 23rd 54.4 55.2 average 99%
York 20.9 -1.1 27.0 1st 7.9 +0.9 2.2 31st 68.8 44.0 high 156%
South Central (district 10A)
Beverley 21.2 -0.3 27.2 1st 8.8 +0.9 2.6 31st 55.0 53.7 average 102%
Brookton 19.9 -0.6 26.0 1st 8.9 +1.2 3.0 19th 61.6 57.0 average 108%
Corrigin 20.0 +0.3 25.7 1st 8.4 +0.8 2.1 23rd 53.1 47.2 average 113%
Hyden 20.7 -0.1 28.9 1st 7.5 -0.1 1.0 23rd 39.5 39.0 average 101%
Katanning 18.3 -1.2 23.7 7th 8.9 +0.1 4.1 31st 71.2 46.7 high 152%
Lake Grace 19.2 -1.1 26.3 1st 9.8 +1.0 4.7 31st 66.2 30.1 v high 220%
Narembeen 20.6 -0.4 28.1 1st 10.0 +1.8 4.4 23rd 43.2 39.6 average 109%
Narrogin 18.9 +0.3 24.5 7th 8.4 +0.6 2.9 24th 68.8 62.7 average 110%
Newdegate Research Station 19.0 -1.2 26.1 1st 8.1 +0.9 2.1 24th 59.0 43.7 high 135%
Ongerup 18.8 -0.1 24.0 7th 9.2 +0.5 4.0 29th 66.0 43.9 high 150%
Pingelly 19.5 -0.2 25.4 1st 9.9 +1.1 3.6 31st 69.8 57.7 high 121%
Ravensthorpe 20.0 -0.1 27.0 7th 10.3 +0.7 5.4 14th 69.7 44.2 high 158%
Wagin 18.5 -1.0 23.8 7th 9.0 +1.1 4.2 24th 69.4 54.4 high 128%
Wandering 19.1 -1.2 24.7 7th 6.9 +0.6 0.2 31st 80.2 51.5 high 156%
Eucla (district 11)
Balladonia 21.3 +0.4 29.5 7th 10.3 +2.3 4.4 16th 118.7 27.1 highest 438%
Eucla 23.4 +2.3 36.5 8th 12.9 +2.4 7.2 17th 25.0 30.9 average 81%
Eyre 22.7 +1.4 36.6 2nd 10.6 +1.5 1.0 11th 51.4 38.8 high 132%
Forrest 24.2 +2.0 36.9 2nd 10.7 +2.0 4.6 28th 10.8 17.1 average 63%
Red Rocks Point 22.7   36.8 2nd 13.3   7.9 31st 45.0 30.2 high 149%
South East (district 12)
Bulga Downs 23.5 -0.7 35.1 1st 9.8 +0.4 3.0 31st 17.6 25.4 average 69%
Kalgoorlie-Boulder Airport 21.4 +0.7 31.6 1st 10.6 +1.9 4.9 12th 40.6 26.3 high 154%
Laverton Aero 23.2 +1.1 35.1 1st 11.8 +1.3 5.7 22nd 24.0 14.3 high 168%
Leinster Aero 22.9 -0.3 35.3 2nd 11.2 +0.5 3.9 23rd 31.4 16.5 high 190%
Leonora 22.5 -0.3 35.0 1st 11.3 +1.1 4.6 25th 40.5 24.1 high 168%
Leonora Aero 23.1   35.9 1st 11.5   5.4 31st 41.2
Munglinup West 19.8 -1.1 29.1 7th 10.4 +0.6 6.5 24th
Norseman Aero 20.6 -0.5 30.0 1st 8.9 +1.8 1.0 23rd 47.6 20.7 v high 230%
Salmon Gums Res.Stn. 20.2 +0.4 28.9 1st 8.4 +1.3 0.0 24th 49.8 34.3 high 145%
Southern Cross Airfield 21.3 -0.2 31.3 1st 9.0 +1.5 1.7 23rd 17.6 29.5 average 60%
Yeelirrie     32.2 6th 9.3 +1.1 3.0 25th 43.0 25.0 high 172%
North East (district 13)
Balgo Hills 28.5 -0.7 36.4 6th 17.4 +1.7 11.7 25th 44.8 15.7 high 285%
Carnegie 26.2 +0.9 35.6 1st 11.3 +0.6 5.5 16th 7.4 15.4 average 48%
Giles Meteorological Office 24.7 +1.0 33.1 4th 13.2 +1.9 6.5 16th 57.6 19.8 high 291%
Telfer Aero 27.8 -1.3 36.6 7th 16.5 +1.2 11.8 26th 33.0 18.9 high 175%
Warburton Airfield 25.5 +1.2 35.1 4th 12.6 +2.2 6.4 24th 27.0 15.4 high 175%
Wiluna 24.6 +0.8 35.5 2nd 11.7 +1.7 5.1 15th 25.9 25.2 average 103%
Offshore Islands (district 200)
Christmas Island Aero 28.2 +0.4 29.8 14th 23.9 +0.1 21.7 10th 478.4 182.4 v high 262%
Cocos Island Airport 29.6 +0.4 31.5 7th 25.7 +0.7 22.4 25th 300.0 193.3 high 155%
Varanus Island 27.4 -0.6 33.0 1st 23.0 -0.6 17.8 15th 17.6 28.9 average 61%

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 3 pm on Monday 3 June 2013. 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, as they cannot then be calculated reliably.
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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

Further information

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