Western Australia in April 2015: sixth coolest April on record

The Statewide mean day-time temperature in April was the sixth lowest on record.

  • An extensive cloudband and the passage of ex-tropical cyclone Ikola brought moderate to heavy rainfall to parts of the Southwest Land Division from the 6th to 12th.
  • Record low maximum temperatures and moderate to heavy rainfall were recorded in the Pilbara, Northern Interior, and Northern Goldfields on the 19th to 22nd
  • Tropical cyclone Quang formed off the northwest coast towards the end of month.

Mean maximum temperatures were below to very much below average over most of WA in April 2014, and a few sites in the west Pilbara recorded their mildest April day-time temperatures on record, whilst sites in the Goldfields and Eucla recorded their mildest April for at least 20 years. Near average temperatures were recorded along the west coast and western south coasts, whilst much of the Kimberley saw near average to above average maxima. Averaged across the State, the mean maximum temperature was -1.78 °C below the long-term average, and was the sixth coolest April on record for WA, and the coolest for nine years, since 2006. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) recorded a mean maximum -0.12 °C below the long-term mean, only its fourth below average month in the past five years.

Hot days were experienced in the north of the State in the first week of April, with daily maxima in the low-forties. Argyle Aerodrome in the East Kimberley recorded a daily maximum temperature of 40.5 °C on the 2nd, its warmest April day in 21 years of record and first 40 °C April day, overtaking the previous record of 39.7 °C on 6 April 2010. Mandora recorded the highest temperature of the month in WA with a daily maximum temperature of 41.2 °C on the 5th, which is its highest temperature in April for six years, since 4 April 1999, when a daily maximum temperature of 41.8 °C was recorded.

Persistent wet and cloudy conditions in northwest and central WA between the 18th and 22nd resulted in low day-time temperatures, with daily maxima often 10 °C to 16 °C cooler than normal. During this period, many sites in the Pilbara, northern Goldfields, and Southern Interior experienced their coolest April day on record, and sites near the Pilbara coast broke their previous April record on several days. Karratha Aerodrome saw its previous lowest April maximum in 22 years of record (26.1°C on 6 April 2006) broken on four consecutive days, with maximum temperatures of 21.2 °C on the 19th; 22.3 °C on the 20th; 19.6 °C on the 21st; and 23.3 °C on the 22nd. Port Hedland Airport recorded a maximum of 19.7 °C on the 20th, which was its first April day below 20 °C in 67 years of record, however this record was immediately broken the following day with a maximum temperature of 19.6 °C. These temperatures were below both the previous Port Hedland Airport April record of 20.6 °C on 7 April 1999, and the Port Hedland Post Office record of 20.1 °C on 6 April 1933, and thus were the lowest April maxima recorded in the town since records commenced in 1913.

Most of WA saw near average overnight temperatures in April, however above to very much above average mean minima were recorded near the Pilbara coast, in the west Gascoyne, Central West, and eastern parts of the Eucla and Southern Interior, whilst areas of below average mean minima were scattered through the southern Kimberley, inland southeast Pilbara, Northern Interior, northeast Southern Interior, Goldfields, eastern Southeast Coastal, and western Eucla. Eyre in the Eucla recorded its coolest April, in terms of mean minimum temperatures, in 55 years of record. Averaged across the State, the mean minimum temperature was near average. For the Lower Southwest, the mean minimum temperature was slightly below average, and only the fifth below average monthly mean minimum temperature in the past 31 months, since October 2012.

Cold nights were recorded across southern parts of the State in the second half of the month and a minimum temperature of 0.2 °C at Eyre on the 21st was the lowest temperature of April 2015 in WA. Forrest's overnight temperature of 4.0 °C on the 30th was its lowest temperature in April in 23 years of record at the current site, and the lowest April temperature in Forrest for over 45 years, since a minimum of 3.4 °C was registered at the old site on 27 April 1970.

Rainfall was above to very much above average in parts of the Southwest Land Division (SWLD), mainly in the South West, South Coastal, and Central West, as well as in the southwest Gascoyne and a broad area covering much of the Pilbara, Southern Interior and Goldfields, with a number of sites, mainly in the SWLD, recording their highest April rainfall for at least 20 years. Leeman in the Central West recorded its highest April total rainfall in 30 years of record. Below average to very much below average rainfall was recorded in the inland Gascoyne, and small parts of the eastern Northern Interior and north Kimberley. Averaged across the State, April 2015 rainfall was near average. When averaged across the South West Land Division (SWLD) as well as the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), April 2015 rainfall was above average, and the wettest April since 2008.

Tropical cyclone Ikola developed in the Indian Ocean west of the Cocos Islands in the first week of April and generally tracked to the southeast. It weakened below tropical cyclone intensity on the 8th, well west of WA, but continued to move to the southeast and moved over the Southwest district on the 10th to became a slow moving low off the WA south coast late in the day. The low produced moderate to heavy rainfall in various locations in the Gascoyne, SWLD, and southern Goldfields from the 6th to 12th, with a few sites in the Central West, Southwest, and South Coastal recording their highest daily rainfall in April on record on the 9th and 10th. Tamaru in the South Coastal recorded a daily total of 99.6 mm on the 10th, which was the highest daily rainfall in April 2015 in WA, and the wettest April day at Tamaru in 50 years of record, exceeding the previous record of 86.7 mm on 1 April 2005.

A low off the northwest coast produced a cloudband and thunderstorm activity that brought moderate to heavy rainfall to the southern Kimberley, Pilbara, Northern Interior and Northern Goldfields from the 18th to 22nd, and Yulmbu in the Kimberley recorded its highest April daily fall in 47 years of record as a result.

A trough and a weak low off the southwest coast produced some moderate rainfall along the South West coast at the end of April, and mainly light rainfall in the Lower West, inland South West, and South Coastal .

Further information

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Extremes in April 2015
Hottest day 41.2 °C at Mandora on the 5th
Warmest days on average 37.3 °C at Wyndham Aero
Coolest days on average 20.2 °C at Shannon
Coldest day 14.4 °C at Rocky Gully on the 24th
Coldest night 0.2 °C at Eyre on the 21st
Coolest nights on average 8.3 °C at Wandering
Warmest nights on average 27.9 °C at Browse Island
24.0 °C at Truscott
Warmest night 29.5 °C at Browse Island on the 7th
29.2 °C at Bidyadanga on the 17th
Warmest on average overall 30.3 °C at Wyndham Aero
Coolest on average overall 15.4 °C at Bridgetown
15.4 °C at Shannon
Wettest overall 153.2 mm at Porongurups
Wettest day 99.6 mm at Tamaru on the 10th
Strongest wind gust 89 km/h at Bedout Island on the 21st

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 April daily rainfall
New record
(mm)
Old
record
Years of
record
Kirup 64.2 on the 10th 60.4 on the 11th in 1995 58
Tamaru 99.6 on the 10th 86.7 on the 1st in 2005 50
Yulmbu 52.0 on the 19th 51.6 on the 9th in 1954 47
Windrush 70.0 on the 9th 65.4 on the 17th in 2002 45
Anro 44.6 on the 9th 23.0 on the 15th in 1988 33
Bunbury 48.4 on the 10th 34.6 on the 1st in 2005 20



Record highest April total rainfall
New record
(mm)
Old
record
Years of
record
Average for
April
Leeman 66.8 63.6 in 1999 30 28.1

Highest April total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Years since
higher
Average for
April
Mount Stuart 141.0 190.2 in 1900* 88 24.4
Pyramid Station 66.6 382.8 in 1966* 43 21.2
Kooline 76.1 101.0 in 1985* 28 16.9
Donnybrook 105.2 149.2 in 1990 25 49.7
Margaret River 122.2 128.0 in 1990 25 67.4
Badgingarra Research Stn 45.4 78.2 in 1992 23 27.7
Busselton Shire 84.7 122.8 in 1990* 23 41.3
Tangadee 78.6 137.0 in 1992 23 24.4
Anro 57.3 70.8 in 1992* 22 18.8
Eneabba 89.4 105.4 in 1992* 22 26.6
Gleneva 74.6 107.8 in 1995 20 22.9
Ogilvie 66.2 98.4 in 1995 20 22.4

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.




Record highest April temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Cocos Island Airport 32.8 on the 7th = 32.8 on the 11th in 1998 64 29.8
Argyle Aerodrome 40.5 on the 2nd 39.7 on the 6th in 2010 21 34.8



Record lowest April daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Port Hedland Airport 19.6 on the 21st 20.6 on the 7th in 1999 67 35.2
Wittenoom 15.1 on the 21st 18.6 on the 7th in 1999 62 33.2
Mardie 23.0 on the 19th 23.4 on the 30th in 1993 59 35.9
Wiluna 14.6 on the 21st 16.2 on the 29th in 2011 56 29.3
Learmonth Airport 23.2 on the 18th 23.4 on the 12th in 1993 41 33.2
Carnegie 15.4 on the 22nd 18.0 on the 20th in 2000 27 30.2
Warburton Airfield 16.4 on the 22nd 17.0 on the 20th in 2000 25 29.4
Karratha Aero 19.6 on the 21st 26.1 on the 6th in 2006 22 34.3
Pardoo Station 20.0 on the 20th 25.8 on the 7th in 1999 22 35.5
Paraburdoo Aero 18.4 on the 21st 23.6 on the 8th in 2006 20 33.6



Record lowest April mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Emu Creek Station 31.3 31.4 in 2006 42 34.9
Learmonth Airport 29.7 30.8 in 1999 40 33.2
Karratha Aero 31.3 31.5 in 2006 21 34.3

Lowest April mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Years since
lower
Average for
April
Balladonia 22.5 22.1 in 1974 41 25.0
Onslow Airport 31.1 31.0 in 1968* 24 33.8
Eucla 22.0 21.6 in 1995 20 23.6
Forrest 23.2 21.9 in 1995 20 26.4
Kalgoorlie-Boulder Airport 22.4 21.9 in 1995 20 25.3
Laverton Aero 24.0 22.5 in 1995 20 26.8
Leinster Aero 24.1 23.1 in 1995 20 27.9

* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported.




Record lowest April temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Forrest 4.0 on the 30th 4.7 on the 29th in 2007 23 12.0



Record lowest April mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Eyre 9.4 9.5 in 2001 55 11.8



Record lowest April mean temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Learmonth Airport 25.0 25.2 in 1999 40 26.8

Lowest April mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Years since
lower
Average for
April
Balladonia 16.4 16.3 in 1995 20 18.0
Forrest 17.1 16.5 in 1995 20 19.2



Summary statistics for April 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
April
2015
Diff
from
average
Highest for
April
2015
Mean for
April
2015
Diff
from
average
Lowest for
April
2015
Total for
April
2015
Average
for
April
Rank of
April
2015
Fraction of
April
average
North Kimberley (district 01)
Doongan 33.3 +0.2 36.0 7th 19.0 +0.1 9.5 28th 28.5 49.7 average 57%
Kalumburu 34.7 0.0 37.2 3rd 20.7 -0.4 13.4 30th 6.4 36.9 average 17%
Mount Elizabeth     36.4 3rd     8.4 28th 61.2 40.7 high 150%
Truscott 33.6 +0.4 35.8 3rd 24.0 0.0 18.3 28th 14.2 83.3 average 17%
Wyndham Aero 37.3 +0.8 40.9 6th 23.4 0.0 16.0 27th 7.2 27.9 average 26%
East Kimberley (district 02)
Argyle Aerodrome 36.0 +1.2 40.5 2nd 23.5 +0.7 16.5 27th 1.2 27.3 low 4%
Halls Creek Airport 33.3 -0.5 38.5 5th 20.0 -0.4 13.6 27th 20.0 21.6 high 93%
Kununurra Aero 36.3 +1.1 39.9 6th 21.6 -0.3 13.4 27th 0 30.3 lowest 0%
Warmun 36.1 +1.0 40.8 3rd 20.5 -0.1 13.4 27th 26.0 25.7 average 101%
West Kimberley (district 03)
Bidyadanga 35.2 -0.5 41.0 4th 22.3 +0.2 16.8 29th 32.0 25.2 high 127%
Broome Airport 33.9 -0.4 38.8 4th 23.3 +0.7 15.0 28th 24.0 26.2 high 92%
Curtin Aero 35.6 -0.8 39.2 3rd 22.1 -0.1 15.0 29th 9.4 42.7 average 22%
Cygnet Bay 32.7 -0.8 35.1 2nd     14.8 30th 78.8 41.9 high 188%
Derby Aero 36.3 +0.8 39.2 3rd 23.1 +0.4 14.4 29th 0.6 25.1 low 2%
Fitzroy Crossing Aero 36.7 +0.1 40.8 4th 21.5 +0.8 14.1 29th 4.4 31.7 average 14%
De Grey (district 04)
Bedout Island 30.4   35.2 2nd 25.6   19.3 23rd
Karratha Aero 31.3 -3.0 37.3 5th 23.0 +0.4 15.9 22nd 30.4 17.6 high 173%
Legendre Island 29.7   34.0 4th 24.4   16.9 22nd
Mandora 34.2 -1.9 41.2 5th 21.2 +0.5 14.8 11th 20.2 19.5 high 104%
Marble Bar 32.4 -3.8 40.3 5th 21.5 -0.5 13.4 22nd 88.8 22.1 high 402%
Pardoo Station 33.2 -2.3 40.2 2nd     14.0 21st 119.3 19.8 v high 603%
Port Hedland Airport 32.9 -2.3 40.3 6th 23.0 +1.6 15.4 22nd 53.2 22.2 high 240%
Roebourne Aero 32.5 -3.7 39.4 5th 22.0 +0.3 14.6 23rd 42.4 9.4 v high 451%
Fortescue (district 05)
Barrow Island Airport 28.7 -2.5 33.9 5th 24.2 -0.4 19.5 22nd 36.2 39.6 average 91%
Learmonth Airport 29.7 -3.5 35.1 6th 20.4 0.0 16.5 29th 19.8 18.4 high 108%
Mardie 32.6 -3.3 39.8 6th 22.3 +1.2 17.3 22nd 23.0 19.7 high 117%
Onslow Airport 31.1 -2.7 37.1 6th 21.8 +0.5 17.0 23rd 16.6 12.1 high 137%
Wittenoom 29.9 -3.3 36.8 11th 20.2 -1.0 11.1 22nd 58.8 28.1 high 209%
West Gascoyne (district 06)
Carnarvon Airport 30.0 +0.9 34.9 9th 20.0 +0.9 16.0 23rd 0.2 13.7 low 1%
Denham 29.2 +0.6 33.4 6th 20.3 +0.6 16.8 15th 4.0 14.1 average 28%
Emu Creek Station 31.3 -3.6 37.2 6th 20.5 -0.2 15.2 23rd 27.7 21.1 high 131%
Gascoyne Junction     36.6 9th     14.1 24th 0.2 14.4 low 1%
Murchison 28.1 -2.9 34.5 9th 16.7 +0.4 11.0 19th 0.4 21.2 v low 2%
Shark Bay Airport 29.4 -1.6 33.6 9th 19.5 +1.3 14.7 23rd 2.8 10.1 average 28%
East Gascoyne (district 07)
Newman Aero 28.0 -3.9 35.6 11th 17.0 -0.4 9.3 22nd 79.2 20.6 v high 384%
Paraburdoo Aero 29.4 -4.2 34.3 9th 18.2 -1.5 12.9 22nd 35.2 26.4 average 133%
Murchison (district 07A)
Meekatharra Airport 25.8 -3.5 33.1 10th 15.9 -1.2 11.3 24th 0.6 19.4 low 3%
Mount Magnet Aero 25.3 -3.7 30.7 5th 15.2 -1.1 9.8 23rd 2.8 19.7 low 14%
Paynes Find 26.2 -2.3 32.7 5th 14.1 -0.1 7.3 26th 32.6 26.0 high 125%
North Coast (district 08)
Carnamah 26.8 -0.8 33.4 5th 15.4 +1.3 9.8 25th 53.4 22.7 high 235%
Dalwallinu 25.1 -2.1 31.0 30th 13.2 0.0 6.8 26th 56.4 12.9 v high 437%
Geraldton Airport 28.0   34.6 6th 16.5   11.0 17th 38.0
Kalbarri 29.1 -0.4 34.0 6th 17.5 +1.3 10.5 23rd 42.8 20.0 high 214%
Morawa Airport 26.9 -2.1 32.7 5th 15.0 +0.6 10.2 23rd 20.6 16.4 high 126%
Mullewa 26.8 -2.0 33.3 5th 15.8 +0.7 11.0 23rd 58.0 21.6 high 269%
North Island 26.5 +0.2 30.1 6th 20.8 +0.4 17.9 29th 38.2 18.3 high 209%
Wongan Hills 25.2 -1.3 31.5 4th 13.2 -0.2 8.5 24th 27.2 22.3 high 122%
Central Coast (district 09)
Badgingarra Research Stn 25.6 -1.6 31.2 4th 14.3 +0.8 10.1 25th 45.4 27.7 high 164%
Bickley 22.3 -1.4 27.3 3rd 11.7 -1.0 7.8 24th 81.6 55.7 high 146%
Garden Island HSF 24.0 +0.1 30.0 5th 15.9 -0.2 11.5 24th 49.6 41.5 high 120%
Gingin Aero 25.8 -0.9 31.3 4th 12.6 +0.6 6.9 22nd 27.0 26.3 average 103%
Jandakot Aero 25.2 -0.6 30.0 5th 12.8 +0.4 6.3 17th 40.0 42.3 average 95%
Jurien Bay 27.4 +1.1 32.0 19th     9.0 18th 34.1 28.6 average 119%
Karnet 22.4 -0.9 27.2 3rd 11.6 -0.2 7.0 16th 79.5 66.9 average 119%
Lancelin 26.8 +1.3 31.5 20th 14.3 -0.3 9.5 17th 42.8 31.1 high 138%
Medina Research Centre 25.3 -0.4 30.0 5th 13.7 +0.3 6.7 17th 44.1 39.4 average 112%
Pearce RAAF 26.1 -0.3 32.3 4th 14.1 +0.7 8.4 18th 54.6 34.8 high 157%
Perth Airport 25.7 +0.1 30.5 5th 13.4 +0.4 8.4 17th 53.2 40.7 average 131%
Perth Metro 25.4 -0.5 30.4 5th 13.5 -0.3 8.9 22nd 54.0 43.8 average 123%
Rottnest Island 23.6 -0.2 26.7 20th 16.7 -0.6 12.2 24th 34.8 35.9 average 97%
Swanbourne 25.7 +0.3 31.8 5th 14.9 -0.3 11.1 24th 57.8 39.2 high 147%
South Coast (district 09A)
Albany 21.2 +0.3 26.5 29th 13.6 +0.8 9.8 26th 77.8 68.7 average 113%
Albany Airport 21.5   25.9 21st 11.1   5.7 26th 94.6
Bridgetown 21.7 -1.9 27.3 3rd 9.1 -0.2 2.7 26th 88.8 49.8 high 178%
Bunbury 23.5 -0.8 28.2 4th 11.5 -0.3 5.1 15th 73.8 36.2 v high 204%
Busselton Aero 22.8 -1.4 27.1 4th 10.8 -0.2 5.1 24th 69.4 35.4 high 196%
Cape Leeuwin 21.5 +0.2 26.9 19th 15.4 -0.1 11.9 26th 65.4 59.7 average 110%
Cape Naturaliste 22.2 +0.3 27.2 4th 13.8 -0.1 8.1 24th 60.8 43.8 high 139%
Collie East 22.8 -1.1 28.1 3rd 8.7 -0.2 2.9 26th 69.2 48.1 high 144%
Donnybrook     28.1 6th     5.6 15th 105.2 49.7 v high 212%
Dwellingup 22.2 -0.3 27.4 3rd 10.6 +0.3 5.7 17th 95.8 66.5 high 144%
Esperance 22.3 -0.9 32.2 10th 12.6 -0.7 6.9 26th 51.6 45.5 high 113%
Esperance Aero 22.5 -1.0 31.8 10th 11.8 -1.0 6.1 26th 57.8 40.3 high 143%
Hopetoun North 21.8 -1.8 30.3 10th 10.6 -2.1 4.1 27th 26.0 38.8 low 67%
Jarrahwood 23.0 -0.8 27.5 21st 8.8 +0.2 2.2 15th 101.2 48.4 high 209%
Mandurah 24.1 0.0 29.5 5th 15.4 -0.4 10.6 24th 71.0 42.9 high 166%
Manjimup 21.0 -0.1 26.9 3rd 11.0 +0.2 6.4 15th 95.4 60.1 high 159%
North Walpole 21.0 -0.6 26.0 20th 12.9 +0.1 7.6 26th 108.0 87.9 average 123%
Pemberton 21.2 0.0 25.7 20th 11.1 +0.1 4.5 26th 118.9 75.0 high 159%
Rocky Gully 20.6 -1.5 26.7 3rd 10.4 -0.6 4.8 17th 103.4 52.8 high 196%
Shannon 20.2 -1.5 25.2 3rd 10.7 -0.1 4.9 16th 113.0 68.2 high 166%
Witchcliffe 21.3 -1.4 26.6 3rd 11.0 -0.1 5.2 26th 119.2 68.2 high 175%
North Central (district 10)
Bencubbin 23.6 -2.3 28.6 30th 12.6 -0.2 6.0 25th 33.0 22.7 high 145%
Cunderdin Airfield 25.3 -1.4 31.7 4th 11.8 -0.3 6.4 18th 20.6 24.2 average 85%
Kellerberrin     28.6 4th     5.6 22nd        
Merredin 23.8 -1.8 31.0 30th 12.7 -0.1 8.5 18th 15.8 22.8 average 69%
Northam 25.0 -1.1 31.5 4th 12.0 0.0 6.6 28th 36.0 23.4 high 154%
York 24.8 -1.7 31.1 4th 10.4 -0.5 4.8 22nd 40.9 21.6 high 189%
South Central (district 10A)
Beverley 25.1 -1.1 30.4 4th 11.1 -0.2 5.4 22nd 31.4 23.1 high 136%
Brookton 23.8 -1.2 28.2 30th 11.2 0.0 6.5 16th 31.3 25.6 average 122%
Corrigin 23.4 -0.9 28.8 4th 10.8 -0.4 4.5 26th 26.4 23.1 average 114%
Hyden 24.3 -1.4 29.8 30th 10.7 -0.4 4.8 16th 22.7 23.7 average 96%
Jacup 22.2 -0.8 28.9 30th 10.1 -0.7 5.8 16th 46.4 43.7 average 106%
Katanning 21.9 -1.6 26.4 4th 10.4 -0.7 5.7 16th
Lake Grace 22.7 -1.7 28.3 30th 11.5 -0.4 6.6 22nd 36.0 25.6 average 141%
Narembeen 24.7 -1.2 29.8 30th 11.7 -0.3 6.9 25th 19.1 22.9 average 83%
Narrogin 22.4 -0.7 27.5 30th 10.6 +0.1 4.6 22nd 43.0 29.4 high 146%
Newdegate Research Station 22.6 -1.8 29.4 30th 9.2 -1.1 2.7 21st 31.8 26.9 average 118%
Ongerup 22.0 -0.8 26.8 3rd 10.7 -0.5 5.9 22nd 30.4 26.1 average 116%
Pingelly 23.3 -0.8 28.2 30th 11.3 -0.5 7.1 17th 35.0 27.0 high 130%
Ravensthorpe 22.4 -1.4 29.5 30th 11.7 -0.1 5.8 16th 41.0 33.1 high 124%
Wagin 22.7 -1.0 27.0 3rd 10.6 -0.1 5.2 26th 45.6 28.8 high 158%
Wandering 22.8 -1.9 27.7 30th 8.3 -1.3 1.9 22nd 60.8 32.2 high 189%
Eucla (district 11)
Balladonia 22.5 -2.5 32.5 10th 10.1 -0.8 5.8 28th 44.9 19.9 v high 226%
Eucla 22.0 -1.6 28.1 13th 12.7 -0.7 8.0 18th 49.0 26.8 high 183%
Eyre 24.0 -0.1 32.4 11th 9.4 -2.4 0.2 21st 14.9 24.9 average 60%
Forrest 23.2 -3.2 29.2 10th 11.4 -0.6 4.0 30th 7.8 18.7 low 42%
Red Rocks Point 22.0 -1.9 26.9 9th 13.6 -0.8 7.5 18th 23.4 27.8 average 84%
South East (district 12)
Bulga Downs 25.1 -3.9 31.5 10th 13.0 -1.4 7.2 26th 10.6 20.9 average 51%
Kalgoorlie-Boulder Airport 22.4 -2.9 32.8 10th 12.3 -0.4 5.6 25th 34.4 20.8 high 165%
Laverton Aero 24.0 -2.8 31.6 10th 13.3 -1.7 6.4 25th 28.4 20.4 average 139%
Leinster Aero 24.1 -3.8 29.8 9th 13.5 -1.9 6.4 25th
Leonora Aero 24.2   29.8 5th 13.6   6.6 25th 16.8
Munglinup West 22.8 -1.7 31.6 10th 11.0 -1.2 6.8 26th 40.8 34.1 average 120%
Norseman Aero 22.5 -2.9 29.9 10th 9.9 -1.1 2.6 17th 29.4 26.1 average 113%
Salmon Gums Res.Stn. 21.7 -2.1 31.9 10th 9.3 -0.6 0.6 26th 42.6 27.1 high 157%
Southern Cross Airfield 23.6 -2.8 30.3 10th 11.8 +0.2 7.1 17th 18.4 24.0 average 77%
Yeelirrie 25.0 -4.0 32.0 10th 13.3 -0.6 5.8 25th 24.9 24.4 average 102%
North East (district 13)
Balgo Hills 33.6 -0.7 39.5 4th 20.2 -0.6 13.5 30th 2.2 17.8 average 12%
Carnegie 27.0 -3.2 36.2 11th 15.4 -0.8 7.8 25th 35.4 22.8 high 155%
Giles Meteorological Office 26.9 -2.5 36.1 14th 14.3 -2.2 6.9 25th 5.2 17.2 average 30%
Telfer Aero 31.9 -2.6 39.6 1st 19.7 -0.9 13.0 22nd 21.4 19.6 high 109%
Warburton Airfield 26.4 -3.0 36.1 12th 15.4 +0.2 7.9 25th 24.0 18.7 high 128%
Offshore Islands (district 200)
Adele Island 31.0   32.2 7th 27.3   24.0 24th
Browse Island 30.9   32.1 17th 27.9   23.9 19th
Christmas Island Aero 29.3 +1.0 30.6 12th 23.7 +0.2 21.6 27th 187.6 222.9 average 84%
Cocos Island Airport 30.9 +1.1 32.8 7th 25.7 +0.5 23.5 25th 212.6 253.1 average 84%

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.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 10 am on Friday 1 May 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages for individual sites 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 used for temperature area averages.

Further information

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