Western Australia in April 2013: A very warm month

  • Rainfall: near average for WA; below average for southwest WA
  • Maximum temperature: 3rd warmest on record for WA and southwest WA
  • Minimum temperature: 5th warmest on record for WA; warmest on record for southwest WA

Rainfall

Rainfall during April 2013 was below to very much below average across large parts of the Southwest Land Division (SWLD), parts of the Gascoyne and in the central and eastern Interior. Above average rainfall was observed in the eastern Pilbara and in parts of the Kimberley, mainly due to heavy rainfall during the first few days of the month, while much of the remainder of the state saw near average rainfall for April 2013.

Averaged across the state as a whole, rainfall during April 2013 was close to average for WA. For the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), and the SWLD, rainfall was below average. Comparable records commenced in 1910.

A weak tropical low moved westward to the north of the Kimberley from the 1st to 5th, resulting in showers and thunderstorms with moderate to heavy falls in parts of the Kimberley and east Pilbara. Particularly heavy rainfall totals were observed in the Kimberley in the 24 hours to 9am on the 3rd when a number of sites observed their wettest April day on record. Abney Hill observed the highest total of the month in WA with 127.0 mm, while Kingston Rest recorded 103.0 mm which is its wettest April day in 33 years of record. Wiluna in the far northern Goldfields also observed its wettest April day in 110 years of record with 98.2 mm.

A cloudband associated with ex-tropical cyclone Victoria brought moderate rainfall to southwest parts of the SWLD from the 11th to 13th, with daily totals generally in the 10 mm to 20 mm range. A band of middle level cloud moved across the southern half of WA on the 17th to 19th, bringing rain and isolated thunderstorms with some moderate falls mainly in the 10 mm to 35 mm range. A thunderstorm produced a heavy downpour at Mount William during the evening of the 17th with 16.0 mm recorded in the 10 minute period ending 2125 WST, which is considered an one in ten year event. The passage of a trough and cold fronts brought light to moderate rainfall to mainly southern WA from the 20th to 22nd.

A middle level trough combined with a surface trough in the Pilbara to produce showers and thunderstorms with some heavy falls in the region on the 26th and 27th. The heaviest daily rainfall total was recorded in the 24 hours to 9am on the 27th at Yarrie (Pilbara) with 95.0 mm, which was the third wettest April day on record at the site. In the south, showers with some moderate rainfall were observed in the South Coastal and Eucla as a cold front moved through southern WA.

Maximum Temperature

Maximum temperatures during April 2013 were above to very much above average throughout much of WA, with areas of highest on record observed in western and southeastern parts of the state. A number of sites in the SWLD and Eucla observed their warmest April on record; while most of the southern half of WA was more than 3 °C warmer than normal, grading to up to 6 °C warmer than normal in inland parts. The only areas of the state to observe near average daytime temperatures during April 2013 were in the east Kimberley, east Pilbara and northwestern Northern Interior.

When averaged across the state as a whole, the mean maximum temperature for WA during April 2013 was very much above average and ranked as the 3rd warmest April since comparable records commenced in 1910. Similarly in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) daytime temperatures were very much above average, also ranking as the 3rd warmest April on record.

Warm to hot conditions were observed across much of western and southern WA to begin April 2013 with a trough near the west coast and a strong high in the Bight directing generally northeasterly winds over the area from the 1st to 5th. Conditions were particularly hot in the SWLD on the 3rd to 5th, with temperatures in the mid-to-high thirties. Jarrahwood in the Southwest observed a maximum temperature of 34.7 °C, which is its hottest day in April in 30 years of record. The trough moved eastward on the 5th and 6th, relieving temperatures in the southwest of the state, although maxima remained high over central and southeastern parts. The trough redeveloped near the west coast on the 7th and remained near stationary through to the 10th, with hot conditions returning to the SWLD, apart from the far southwest. A number of sites observed their hottest April day on record during this period with temperatures mainly in the mid-to-high thirties. The west coast trough gradually cleared eastward as a cloudband developed over southwest WA on the 11th, extending over much of the southern half of the state during subsequent days, with the hot conditions contracting to central and southeastern parts of the state. Maximum temperatures remained high in northern parts of the SWLD on the 11th, with Eneabba reaching 40.0 °C which is its new April record and the only 40 °C day of the month in the SWLD. The unseasonably hot start to the month was a major contributor to a number of sites across the SWLD and Eucla observing their warmest April on record.

Minimum Temperature

Minimum temperatures during April 2013 were above to very much above average across southern and western WA with areas of up to 4 °C above normal in mainly inland southern parts. Areas of highest on record were observed through much of the SWLD, and in the southeastern Gascoyne, parts of the Goldfields, western Eucla with numerous sites, some with over 100 years of record, observing their warmest April on record. The record warm April in the SWLD was mainly a result of a very warm start to the month, combined with cloudy conditions through the middle of April and a general lack of frontal activity. Below average overnight temperatures were observed mainly in the north Kimberley, with an area of up to 2 °C below normal in the far northeast of the district, while the remainder of the state was near average.

When averaged across WA as a whole, the mean minimum temperature during April 2013 was very much above average, ranking as the 5th warmest on record, whilst the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) ranked as the warmest April on record. Comparable temperature records commenced in 1910.

After hot day in the SWLD on the 10th, temperatures remained high overnight with daily minima in low twenties. Eneabba observed the highest minimum temperature in the SWLD with 23.6 °C on the 11th, which was the third hottest night in April on record at the site, while Badgingarra observed their warmest April night on record with 22.9 °C.

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Extremes in April 2013
Hottest day 42.6 °C at Roebourne on the 20th
Warmest days on average 37.7 °C at Roebourne
Coolest days on average 22.1 °C at Albany
Coldest day 14.7 °C at Ongerup on the 28th
Coldest night 2.8 °C at Eyre on the 1st
Coolest nights on average 11.8 °C at Collie East
Warmest nights on average 27.0 °C at Troughton Island
23.8 °C at Truscott
Warmest night 28.8 °C at Troughton Island on the 1st
28.4 °C at Broome Airport on the 1st
Wettest overall 179.8 mm at Abney Hill
Wettest day 127.0 mm at Abney Hill on the 3rd
Highest wind gust 83 km/h at Roebourne Aero on the 26th

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

Record highest April daily rainfall
Highest daily rainfall
in April 2013 (mm)
Previous wettest
for April
Years of
record
Wiluna 68.2 on the 3rd 57.5 on the 9th in 2003 110
Lake Argyle Resort 64.4 on the 3rd 54.6 on the 29th in 1989 44
Kununurra Aero 73.6 on the 3rd 50.8 on the 29th in 2006 39
Kingston Rest 103.0 on the 3rd 61.0 on the 29th in 2006 33



Record highest April temperature
Highest temperature
in April 2013 (°C)
Previous warmest
for April
Years of
record
Average for
April
Geraldton Airport Comparison 39.7 on the 11th 39.4 on the 6th in 1959 71 27.7
Perth Airport 37.7 on the 8th = 37.7 on the 2nd in 1972 69 25.5
Corrigin 37.1 on the 10th 36.6 on the 6th in 1959 65 24.2
Pearce RAAF 39.4 on the 8th 38.6 on the 4th in 1972 56 26.3
Manjimup 34.4 on the 8th 33.6 on the 2nd in 1972 54 21.1
Dwellingup 34.7 on the 8th 34.4 on the 2nd in 1972 53 22.4
Merredin 38.0 on the 11th 36.5 on the 5th in 1998 48 25.4
Karnet 35.0 on the 8th = 35.0 on the 2nd in 1972 47 23.2
Narembeen 37.6 on the 10th 36.7 on the 2nd in 1972 46 25.8
Eneabba 40.0 on the 11th 39.7 on the 1st in 1972 40 29.3
Hyden 38.2 on the 10th 37.4 on the 4th in 1978 40 25.6
Paynes Find 38.2 on the 10th 38.0 on the 7th in 1986 32 28.4
Jarrahwood 34.7 on the 3rd 34.6 on the 4th in 1991 30 23.7



Record highest April mean daily maximum temperature
Mean daily maximum
temperature
for April 2013 (°C)
Previous warmest
for April
Years of
record
Average for
April
Perth Metro* 28.5 28.2 in 1999, 1987 116 25.8
Narrogin 26.5 26.2 in 1994 94 23.0
Carnamah 31.4 31.0 in 1950 70 27.6
Geraldton Airport Comparison 30.6 30.2 in 2011 70 27.7
Mullewa 33.3 32.0 in 1950 67 28.7
Corrigin 28.0 27.1 in 1994 64 24.2
Eyre 27.3 26.6 in 2012 53 24.1
Merredin 29.5 28.6 in 1994 47 25.4
Brookton 28.0 27.2 in 1994 45 24.9
Wongan Hills 29.5 28.8 in 1994 44 26.4
Beverley 29.5 28.5 in 1978 43 26.1
Pingelly 27.2 26.5 in 2009 42 24.0



Record highest April daily minimum temperature
Highest daily minimum
temperature
in April 2013 (°C)
Previous warmest
for April
Years of
record
Average for
April
Bencubbin 22.2 on the 12th = 22.2 on the 1st in 1989 55 12.8
Badgingarra Research Stn 22.9 on the 11th 22.8 on the 13th in 2009 45 13.5
Gascoyne Junction 27.9 on the 17th 26.5 on the 10th in 2011 41 18.6



Record highest April mean daily minimum temperature
Mean daily minimum
temperature
for April 2013 (°C)
Previous warmest
for April
Years of
record
Average for
April
Cape Leeuwin 17.8 17.1 in 1999 116 15.4
Cape Naturaliste 16.2 15.8 in 1937 109 13.9
Donnybrook 14.5 13.0 in 1918 109 10.4
Albany 15.7 14.9 in 2003 96 12.7
Narrogin 14.0 13.6 in 1981 93 10.5
Dwellingup 13.6 12.9 in 1978 74 10.2
Manjimup 13.7 12.8 in 1999 73 10.7
Kalgoorlie-Boulder Airport 16.1 15.4 in 1945 72 12.6
Pemberton 14.3 12.6 in 1997 69 10.9
Perth Airport 16.1 15.2 in 1978 68 12.9
Mullewa 18.7 17.1 in 2011 67 15.0
Corrigin 14.5 13.6 in 1981 64 11.1
Bencubbin 16.3 15.5 in 1981 61 12.8
Pearce RAAF 16.3 16.0 in 1978 51 13.3
Ravensthorpe 14.4 13.6 in 1965 50 11.7
Albany Airport Comparison 13.7 12.8 in 1965 48 11.6
Merredin 16.0 15.4 in 1978 47 12.7
Karnet 15.0 13.9 in 1978 46 11.7
Onslow Airport 23.5 23.3 in 2005 46 21.3
Brookton 14.4 13.4 in 1978 45 11.1
Narembeen 15.8 15.7 in 2003 45 11.9
Badgingarra Research Stn 16.3 16.0 in 1994 44 13.5
Lancelin 16.5 16.3 in 1997 44 14.5
Ongerup 14.0 13.0 in 1997 44 11.1
Beverley 14.6 14.0 in 1978 43 11.2
Esperance 15.3 14.5 in 2010 43 13.2
Pingelly 14.9 14.0 in 1978 42 11.7
Wagin 14.2 12.3 in 1981 39 10.6
Jarrahwood 11.9 10.8 in 1988 30 8.5



Summary statistics for April 2013
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2013
Diff
from
average
Highest for
April
2013
Mean for
April
2013
Diff
from
average
Lowest for
April
2013
Total for
April
2013
Average
for
April
Rank of
April
2013
Fraction of
April
average
North Kimberley (district 01)
Doongan 33.2 +0.1 36.1 23rd 18.2 -0.8 12.3 12th 10.1 47.7 average 21%
Kalumburu 35.0 +0.4 37.9 23rd 20.7 -0.3 13.8 28th 5.2 39.1 low 13%
Mount Elizabeth 32.6 +0.1 36.0 23rd 16.7 0.0 9.3 28th 30.0 39.4 average 76%
Troughton Island 32.6 -0.1 33.9 19th 27.0 +0.2 24.3 5th 77.0 32.9 v high 234%
Truscott 33.1   35.2 24th 23.8   20.1 28th 54.6
Wyndham 35.3 -0.5 39.2 23rd 22.5 -1.1 17.1 28th 43.0 36.0 high 119%
Wyndham Aero 36.0 -0.5 39.9 22nd 22.5 -0.9 17.5 28th 34.8 28.0 high 124%
East Kimberley (district 02)
Argyle Aerodrome 35.0 +0.2 38.8 23rd 22.1 -0.7 17.7 29th 69.0 26.4 v high 261%
Halls Creek Airport 34.1 +0.3 38.5 23rd 20.7 +0.3 16.7 29th 8.4 21.4 average 39%
Kununurra Aero 35.2 0.0 38.1 23rd 20.0 -1.9 14.1 28th 120.0 30.4 v high 395%
Warmun 35.1 0.0 39.6 23rd 19.9 -0.7 14.6 28th 47.5 25.3 high 188%
West Kimberley (district 03)
Bidyadanga 35.7 +0.1 39.5 16th 22.3 +0.2 14.8 30th 20.1 25.3 high 79%
Broome Airport 35.0 +0.7 38.2 24th 23.1 +0.5 16.0 30th 10.0 26.2 average 38%
Curtin Aero 37.2 +0.9 40.5 24th 21.1 -1.2 15.4 29th 10.4 44.5 average 23%
Cygnet Bay 33.8 +0.3 35.9 20th 22.7 +0.4 16.7 30th 103.8 40.7 high 255%
Derby Aero 36.2 +0.7 39.8 24th 22.5 -0.2 16.7 30th 4.6 25.7 average 18%
Fitzroy Crossing Aero 36.7 +0.2 40.3 23rd 20.1 -0.6 12.7 29th 28.8 33.3 average 86%
West Roebuck 35.8 +0.6 39.4 24th 22.3 +0.7 16.4 30th 1.8 35.1 low 5%
De Grey (district 04)
Karratha Aero 35.7 +1.5 40.0 20th 23.1 +0.5 19.7 23rd 6.4 17.6 average 36%
Legendre Island 33.4   39.0 20th 25.7   19.8 27th
Mandora 36.6 +0.5 40.2 19th 20.2 -0.6 13.7 30th 43.8 19.7 high 222%
Marble Bar 37.0 +0.9 40.3 19th 21.6 -0.5 17.6 13th 10.2 18.6 high 55%
Port Hedland Airport 36.5 +1.3 41.4 20th 21.7 +0.3 18.0 13th 0 22.1 lowest 0%
Roebourne 37.7 +2.4 42.6 20th 22.8 +0.6 18.7 13th 17.0 28.4 high 60%
Roebourne Aero 37.3 +1.2 41.5 20th 21.2 -0.6 17.4 13th 20.0 7.4 high 270%
Fortescue (district 05)
Barrow Island Airport 32.4 +1.3 34.9 8th 25.3 +0.8 22.2 13th 0.2 41.8 low 0%
Learmonth Airport 34.1 +0.9 39.2 15th 21.0 +0.6 14.9 24th 0 15.4 lowest 0%
Mardie 37.0 +1.2 40.0 20th 22.4 +1.4 17.1 23rd
Onslow Airport 35.4 +1.7 38.7 20th 23.5 +2.2 18.7 23rd 5.0 11.9 average 42%
Wittenoom 35.3 +2.2 38.5 15th 21.6 +0.4 16.9 27th 11.2 28.0 average 40%
West Gascoyne (district 06)
Carnarvon Airport 31.4 +2.3 38.8 12th 20.6 +1.5 15.5 23rd 0 13.9 lowest 0%
Denham 30.3 +1.8 37.0 12th 21.3 +1.6 16.0 22nd 0 14.0 lowest 0%
Emu Creek Station 37.0 +2.1 41.9 15th         14.4 20.3 average 71%
Murchison 33.9 +3.1 38.0 11th 18.7 +2.6 9.8 22nd 6.6 22.4 low 29%
Shark Bay Airport 33.0 +2.1 38.6 4th 19.8 +1.7 15.5 2nd 0.2 9.2 low 2%
East Gascoyne (district 07)
Newman Aero 34.2 +2.5 37.7 19th 18.7 +1.4 15.0 11th 2.4 19.4 low 12%
Paraburdoo Aero 36.2 +2.8 39.8 16th 21.0 +1.4 16.4 27th
Murchison (district 07A)
Meekatharra Airport 33.0 +3.8 36.7 14th 19.1 +2.1 12.4 22nd 3.2 19.9 average 16%
Mount Magnet Aero 32.6 +3.9 37.3 6th 18.9 +2.8 9.6 22nd 1.4 20.5 low 7%
North Coast (district 08)
Carnamah 31.4 +3.8 39.4 10th 17.2 +3.1 10.1 21st 5.9 22.3 low 26%
Dalwallinu 30.1 +3.1 37.5 11th 16.0 +3.0 10.3 21st 2.6 9.5 low 27%
Geraldton Airport 30.4   39.3 11th 16.8   11.1 23rd 4.6
Geraldton Airport Comparison 30.6 +2.9 39.7 11th 17.0 +1.6 11.0 23rd 4.2 23.4 low 18%
Kalbarri 31.6 +2.2 37.3 13th 17.8 +1.6 11.0 22nd 5.7 18.5 average 31%
Morawa Airport 32.1 +3.2 38.8 11th 16.9 +2.7 9.2 22nd 7.2 13.0 average 55%
Mullewa 33.3 +4.6 39.0 10th 18.7 +3.7 10.3 23rd 4.4 21.0 average 21%
North Island 27.7 +1.5 30.6 13th 21.7 +1.4 19.4 23rd 4.0 14.2 low 28%
Wongan Hills 29.5 +3.1 37.2 11th 15.9 +2.5 9.0 21st 7.5 22.2 low 34%
Central Coast (district 09)
Badgingarra Research Stn 29.7 +2.5 37.2 8th 16.3 +2.8 9.3 21st 12.2 27.0 low 45%
Bickley 26.1 +2.6 35.1 8th 15.7 +3.2 9.8 29th 16.8 55.4 low 30%
Champion Lakes 27.8   35.8 8th 17.8   11.6 23rd 15.0
Garden Island HSF 25.7 +1.9 35.7 8th 18.3 +2.5 13.6 29th 26.4 43.2 low 61%
Gingin Aero 28.9 +2.3 37.8 8th 15.0 +3.1 8.5 24th 13.8 26.2 low 53%
Gosnells City                 21.3 44.1 low 48%
Jandakot Aero 28.0 +2.3 37.0 8th 15.3 +3.0 8.7 23rd 19.2 42.9 average 45%
Karnet 25.9 +2.7 35.0 8th 15.0 +3.3 8.1 23rd 16.9 67.4 low 25%
Lancelin 27.7 +2.2 35.5 8th 16.5 +2.0 11.0 29th 9.5 30.6 low 31%
Medina Research Centre                   39.8 average 69%
Pearce RAAF 29.4 +3.1 39.4 8th 16.3 +3.0 9.2 23rd 16.0 34.6 low 46%
Perth Airport 28.7 +3.2 37.7 8th 16.1 +3.2 9.6 23rd 7.6 40.9 low 19%
Perth Metro 28.5 +2.7 37.3 8th 16.7 +3.1 11.0 23rd 21.0 44.1 average 48%
Rottnest Island 25.6 +1.9 32.6 8th 19.3 +2.1 14.3 29th 16.0 35.5 low 45%
Swanbourne 27.9 +2.6 35.8 8th 17.7 +2.6 12.6 23rd 13.8 38.2 low 36%
South Coast (district 09A)
Albany 22.1 +1.2 34.4 4th 15.7 +3.0 11.9 29th 62.8 68.9 average 91%
Albany Airport 22.8   34.8 4th 13.6   8.2 29th 40.2
Albany Airport Comparison 22.5 +0.6 34.4 4th 13.7 +2.1 8.4 29th 0 60.1 lowest 0%
Bridgetown 25.2 +1.8 34.7 8th 12.4 +3.3 4.4 29th 25.2 50.0 average 50%
Bunbury 25.8 +1.7 32.5 8th 14.6 +3.0 8.9 29th 23.2 35.2 average 66%
Busselton Aero 26.0 +2.0 32.7 9th 13.2 +2.3 5.8 29th 33.0 35.1 average 94%
Cape Leeuwin 23.0 +1.7 30.6 4th 17.8 +2.4 12.3 29th 22.4 59.9 low 37%
Cape Naturaliste 24.6 +2.7 30.0 3rd 16.2 +2.3 10.6 29th 44.2 43.9 average 101%
Collie East 25.7 +2.1 34.9 8th 11.8 +3.1 5.5 21st 1.6 45.2 low 4%
Donnybrook 27.0 +2.9 35.2 8th 14.5 +4.1 9.3 28th 30.3 49.6 low 61%
Dwellingup 25.4 +3.0 34.7 8th 13.6 +3.4 7.4 23rd 21.8 66.6 low 33%
Esperance 25.0 +1.8 35.7 5th 15.3 +2.1 10.7 21st 44.4 46.0 average 97%
Esperance Aero 25.7 +2.4 35.8 11th 14.6 +1.9 9.8 21st 37.0 40.6 average 91%
Harvey 26.7 +2.0 35.8 8th 15.2 +3.0 9.0 21st 21.6 49.7 low 43%
Jarrahwood 26.3 +2.6 34.7 3rd 11.9 +3.4 4.5 29th 31.2 48.0 average 65%
Mandurah 25.9 +2.0 31.6 3rd 18.3 +2.7 13.6 29th 20.0 42.9 low 47%
Manjimup 23.6 +2.5 34.4 8th 13.7 +3.0 8.5 29th 38.8 60.1 average 65%
North Walpole 22.5   33.8 4th 14.4   7.3 29th 49.0 89.8 low 55%
Pemberton 23.8 +2.6 33.5 8th 14.3 +3.4 8.6 29th 43.2 74.9 low 58%
Rocky Gully 23.4 +1.4 35.0 8th 13.3 +2.5 7.0 29th 39.6 51.3 average 77%
Windy Harbour 22.8 +0.8 31.4 4th 14.4 +2.3 4.9 29th 32.5 70.1 low 46%
Witchcliffe 24.5 +2.0 32.3 3rd 13.2 +2.3 4.9 29th 29.6 67.8 low 44%
North Central (district 10)
Bencubbin 29.5 +3.7 37.2 11th 16.3 +3.5 8.6 21st 5.4 22.5 low 24%
Cunderdin Airfield 29.5 +3.0 38.1 11th 15.0 +3.1 7.2 21st 4.0 22.5 low 18%
Kellerberrin                 5.3 21.0 low 25%
Merredin 29.5 +4.1 38.0 11th 16.0 +3.3 7.3 23rd 11.0 22.9 average 48%
Northam 29.0 +2.9 37.0 9th 15.0 +3.0 7.3 23rd 12.2 23.1 average 53%
York 29.1 +2.8 37.2 8th 14.2 +3.5 6.4 23rd 4.8 18.4 low 26%
South Central (district 10A)
Beverley 29.5 +3.4 37.4 9th 14.6 +3.4 7.0 23rd 4.6 22.9 low 20%
Brookton 28.0 +3.1 37.2 9th 14.4 +3.3 6.5 23rd 2.9 25.7 low 11%
Corrigin 28.0 +3.8 37.1 10th 14.5 +3.4 6.5 21st 3.5 22.4 low 16%
Hyden 28.6 +3.0 38.2 10th         12.0 23.5 average 51%
Jacup 24.9 +2.0 35.9 8th 13.6 +2.9 6.9 21st 25.4 42.3 average 60%
Katanning 25.1 +1.7 35.5 8th 13.3 +2.4 7.9 29th 7.8 31.3 low 25%
Lake Grace 26.7 +2.4 36.3 9th 14.9 +3.2 8.2 21st 15.0 23.6 average 64%
Narembeen 28.9 +3.1 37.6 10th 15.8 +3.9 8.9 23rd 17.0 22.8 average 75%
Narrogin 26.5 +3.5 36.0 9th 14.0 +3.5 6.4 21st 5.8 29.4 low 20%
Newdegate Research Station 26.3 +2.1 35.7 9th 12.9 +2.7 6.0 21st 4.8 26.2 low 18%
Ongerup 24.8 +2.1 35.0 8th 14.0 +2.9 8.0 23rd 6.8 26.2 low 26%
Pingelly 27.2 +3.2 36.4 9th 14.9 +3.2 7.8 21st 5.6 27.0 low 21%
Ravensthorpe 26.0 +2.3 35.9 9th 14.4 +2.7 9.1 24th 12.0 33.0 low 36%
Wagin 25.9 +2.2 35.0 8th 14.2 +3.6 8.4 23rd 13.0 28.8 average 45%
Wandering 26.8 +2.2 36.6 9th 12.7 +3.3 5.6 21st 20.4 31.2 average 65%
Eucla (district 11)
Eucla 25.8 +2.2 36.5 12th 14.5 +1.2 9.2 22nd 32.6 26.4 high 123%
Eyre 27.3 +3.2 37.4 12th 12.2 +0.4 2.8 1st 28.3 25.0 average 113%
Red Rocks Point 25.0   37.6 12th 15.2   8.3 22nd 28.0
South East (district 12)
Bulga Downs 32.4 +3.7 36.8 6th 16.3 +2.1 8.0 22nd 3.6 20.9 average 17%
Kalgoorlie-Boulder Airport 28.0 +2.8 35.5 11th 16.1 +3.5 8.9 22nd 11.2 20.6 average 54%
Laverton Aero 31.6 +5.0 35.5 12th 17.7 +2.8 9.4 22nd 19.2 18.4 average 104%
Leinster Aero 32.0 +4.3 36.1 19th 17.7 +2.3 9.3 22nd 0.4 26.8 v low 1%
Leonora 31.7 +3.8 36.5 6th 17.1 +2.3 9.3 22nd 7.0 20.3 average 34%
Leonora Aero 31.9   36.0 10th 17.2   8.9 22nd 6.8
Munglinup West 26.0 +1.8 36.5 9th 14.6 +2.6 7.9 21st 0 32.1 v low 0%
Norseman Aero 27.8 +2.6 36.3 11th 13.6 +2.8 6.7 21st 6.6 25.9 low 25%
Salmon Gums Res.Stn. 26.3 +2.6 35.7 11th 12.3 +2.4 5.2 24th 9.8 27.1 low 36%
Southern Cross Airfield 29.3 +3.1 37.0 11th 14.7 +3.3 6.3 23rd 3.0 23.4 low 13%
Yeelirrie         15.0 +1.0 7.0 23rd 12.4 24.7 average 50%
North East (district 13)
Carnegie 33.3 +3.3 37.7 19th 17.0 +0.8 12.6 25th 0 22.9 lowest 0%
Giles Meteorological Office 31.1 +1.7 36.8 20th 16.9 +0.4 12.7 24th 0 15.5 lowest 0%
Telfer Aero 34.7 +0.2 38.8 20th 20.5 -0.1 16.4 30th 22.4 20.0 high 112%
Warburton Airfield 32.6 +3.3 38.0 20th 17.0 +1.9 12.9 23rd 0 18.0 lowest 0%
Wiluna 33.1 +3.9 37.5 19th         71.0 29.3 v high 242%
Offshore Islands (district 200)
Christmas Island Aero 28.8 +0.6 29.4 19th 24.4 +0.9 22.2 15th 409.8 224.3 v high 183%
Cocos Island Airport 30.5 +0.8 31.3 15th 26.5 +1.3 24.5 9th 8.8 253.7 lowest 3%
Varanus Island 32.3 +1.2 34.1 14th 26.9 +0.9 24.3 27th 0 44.1 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 10 am on Wednesday 1 May 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.

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