Western Australia in April 2014: wet start and finish

Frequent thunderstorms in the first two weeks of April in the northern and eastern WA resulted in above average rainfall in these regions, and a significant rainfall event in the last week of the month ended a long dry spell in western parts of the state with heavy rainfall causing flash flooding, particularly in the west Pilbara, and numerous April daily rainfall records. Below to very much below average rainfall was reported in the southern Southwest Land Division (SWLD), east Gascoyne, and east Pilbara. Day-time and overnight temperatures were generally near average or above average across the State.

  • A thunderstorm on the 6th brings record April daily rainfall to Nalyerlup in the South Coastal district. 
  • Slow moving thunderstorms in the west Pilbara on the 26th cause record daily rainfall, flash flooding, and extensive damage to the Exmouth region.
  • A cloudband associated with ex-tropical cyclone Jack off the WA west coast brings widespread rainfall to much of the SWLD on the 26th and 27th, with record high April daily falls reported at numerous locations in the northern and central SWLD, and flash flooding and minor damage reported in the eastern Lower West and northern Great Southern.
  •  Severe tropical cyclone Jack develops well off the northwest WA coast and has no direct impact on WA, though the decaying ex-tropical cyclone helps bring some significant rainfall to the State. Jack was the fifth tropical cyclone in the Western Region for the 2013-14 season.
  • Record 186 day dry spell comes to an end at Kalbarri in the Central West on the 24th

Rainfall

April 2014 rainfall was above average in the west Pilbara, western and southern Gascoyne, northern and eastern SWLD, and Kimberley, as well as a broad area of eastern WA. A few sites in the west Pilbara and Great Southern recorded their wettest April on record, largely due to a significant rainfall event over the ANZAC day weekend late in the month, whilst Giles Meteorological Office in the Southern Interior also recorded its wettest April on record as the result of the rainfall early in the month. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), eastern Southeast Coastal, east Pilbara, and east Gascoyne saw below to very much below average rainfall.

Averaged across WA as a whole, rainfall in April 2014 was above average. The SWLD recorded near average rainfall when averaged across the region, however below average rainfall was observed in the Lower Southwest.

A weak cold front moved across southern WA at the start of April bringing light showers to SWLD coastal parts.

A surface trough extending from the Kimberley to the west coast coincided with a middle level trough moving eastward across the State from the 4th to the 8th and produced showers and thunderstorms across much of WA. Moderate to heavy rainfall was recorded in the Kimberley, Northern and Southern Interior, and South Coastal districts. Giles Meteorological Office (Southern Interior) recorded its monthly rainfall total of 124.8 mm during this event, making this month the wettest April in 58 years of record. Daily rainfall of 50.0 mm at Nalyerlup (South Coastal) on the 7th was the wettest April day in 31 years of record at the site, exceeding its previous record of 43.6 mm on 17 April 1998.

Sunny and warm weather was experienced for most of WA through middle parts of the month, but a middle level trough combined with tropical moisture associated with ex-tropical cyclone Jack off the northwest coast to produce an extensive cloudband with widespread rainfall over the west Pilbara, Gascoyne, Goldfields, and SWLD from the 24th to the 27th, whilst a weak cold front in the wake of the trough brought light to moderate rainfall to western parts of the SWLD from the 27th to 29th.

Significant rainfall occurred on the 26th in the west Pilbara as a result of slow moving thunderstorms with daily rainfalls ranging from 50 mm to over 200 mm, with a few sites breaking April daily rainfall records. Exmouth Town recorded 206.0 mm in the 24 hours to 9 am on the 27th, exceeding its previous highest daily rainfall in April in 43 years of record of 136.4 mm on 20 April 1980. Ningaloo Reef, a unofficial observing site in Cape Range National Park, recorded 237.7 mm during the event, and anecdotal evidence suggests close to 400mm may have fallen in the Cape Range area to the west of Exmouth.The deluge caused significant localised flooding within the Exmouth town site, including inundation of some properties in low-lying areas, damage to local roads and causeways, and damage to a water main. The Cape Range National Park was extensively damaged and the caravan park was inundated to the extent that the residents were taken to an evacuation centre in Exmouth.

Widespread heavy rainfall was also reported on the 26th and 27th in the Gascoyne, Central West, Central Wheat Belt, and Great Southern, and numerous sites observed their wettest April day on record. Minor water damage was reported in Toodyay (Lower West) and Quairading (Central Wheat Belt) where daily rainfall totals in the 60 mm to 70 mm range were reported.

Kalbarri recorded 51.8 mm on the 27th, its highest daily rainfall total in April in 44 years of record. This rainfall event came only two days after Kalbarri ended a record long dry spell of 186 days with only 0.8 mm, from 21 October 2013 to 24 April 2014. The previous the longest dry spell at Kalbarri with a total of 0.8 mm or less was 170 days from 3 December 2008 to 21 May 2009.

Maximum temperature

Mean maximum temperatures in April 2014 were above to very much above average in most of the SWLD and across much of the northern half WA, with means 2 to 3 °C warmer than normal in the southwest Gascoyne. Below average mean maximum temperatures were confined to small parts of the west Pilbara, eastern Interior, and Goldfields, with means up to 2 °C cooler than normal in the northern Goldfields.

Averaged across the state as a whole, the mean maximum temperature for WA in April 2014 was above average, whilst the Lower Southwest was also above average. The above average month in the Lower Southwest continued a run of 13 consecutive months above the long-term average, with only three months since October 2009 (three in the past 55 months) being below average.

In the north, hot days with maxima in the high thirties to low-forties were observed in the Kimberley and east Pilbara on the first four days of April. Derby Aerodrome recorded a maximum of 40.7 °C on the 2nd, its warmest April day in 30 years of record, whilst the highest temperature recorded in WA in April 2014 was 41.0 °C at Fitzroy Crossing Aerodrome on the 2nd and at Bidyadanga on the 3rd. Much of the Gascoyne and southern Pilbara experienced hot days with maxima in the mid-to-high thirties on the 3rd and 4th, and from the 12th to 15th, whilst mild days with maxima in the mid-to-high twenties were observed in the Gascoyne on the 6th and 7th, and from 25th to 30th.

In the south, warm to hot days with maxima in the mid-twenties to low thirties were experienced in parts of the SWLD on the 4th and 5th. and from 8th to 15th. High temperatures in the low thirties were recorded in the northern Goldfields from the 15th to 20th. Cool to cold days with maxima in the high teens were reported near the south coast on the 1st and 2nd, 20th and 21st, and across large parts of the SWLD from the 28th to the 30th. The lowest maximum temperature recorded in the month was 13.6 °C at Mount Barker on the 28th.

Minimum temperatures

Mean minimum temperatures in April 2014 were above to very much above average across much of the southern half of WA, as well as areas in the north and east Kimberley, with means up to 3 °C warmer than normal in parts of eastern WA. Mean minimum temperatures were near average for most of the northern half of the State and near the west coast.

The mean minimum temperature averaged across WA in April 2014 was above average, and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) also recorded above average mean overnight temperatures. WA has recently seen a run of consistently above average months, in terms of mean minimum temperatures, with only one month in the past 20 being below the long-term average. Similarly the Lower Southwest has been above average for the past nine consecutive months.

In the north, nights were mostly mild, though a few warm nights with minima in the mid-to-high twenties were observed in the Kimberley and Pilbara region on the first seven days and last three days of the month. Troughton Island recorded the warmest night in WA in April 2014 with a minimum of 29.3 °C on the 3rd.

Warm nights with minima in the high teens to low twenties occurred between the 10th and 15th in parts of the SWLD. In contrast, cold nights with minima below 10 °C were observed in the SWLD mostly from the 2nd to 4th, on the 17th, from the 21st to 23rd, and from the 28th to 30th, whilst cold nights in the southern Goldfields were mostly confined to the last two days of the month. Jarrahwood in the Southwest district recorded a minimum temperature of 0.9 °C on the 22nd, the lowest temperature recorded in April 2014 in WA.

Further information

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Extremes in April 2014
Hottest day 41.0 °C at Fitzroy Crossing Aero on the 2nd
41.0 °C at Bidyadanga on the 3rd
Warmest days on average 37.4 °C at Wyndham Aero
Coolest days on average 21.4 °C at Albany
Coldest day 13.6 °C at Mount Barker on the 28th
Coldest night 0.9 °C at Jarrahwood on the 22nd
Coolest nights on average 8.1 °C at Jarrahwood
Warmest nights on average 28.4 °C at Browse Island
24.6 °C at Truscott
Warmest night 29.3 °C at Troughton Island on the 3rd
29.0 °C at Broome Airport on the 3rd
Warmest on average overall 30.8 °C at Wyndham Aero
Coolest on average overall 16.5 °C at Bridgetown
Wettest overall 251.0 mm at Exmouth Town
Wettest day 206.0 mm at Exmouth Town on the 27th
Highest wind gust 104 km/h at Derby Aero on the 3rd

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
Highest daily rainfall
in April 2014 (mm)
Previous wettest
for April
Years of
record
Toodyay 56.0 on the 27th 45.0 on the 2nd in 1964 106
Corrigin 67.0 on the 27th 51.6 on the 2nd in 1964 105
Quairading 71.8 on the 27th 55.1 on the 17th in 1919 104
St Albans 69.0 on the 27th 43.2 on the 4th in 1974 102
Wattening 54.0 on the 27th 45.0 on the 14th in 1961 100
Yuin 73.4 on the 27th 58.7 on the 30th in 1966 85
Learmonth Airport 154.4 on the 27th 89.8 on the 20th in 1980 61
Newdegate Research Station 59.0 on the 27th 49.5 on the 2nd in 1964 60
Amrista Park 100.0 on the 27th 55.2 on the 3rd in 1974 59
Chesalon 57.0 on the 27th 28.4 on the 2nd in 1975 48
Kalbarri 51.8 on the 27th 46.4 on the 17th in 1979 44
Exmouth Town 206.0 on the 27th 136.4 on the 20th in 1980 43
Mordetta 77.0 on the 27th 60.5 on the 2nd in 1974 42
Nalyerlup 50.0 on the 7th 43.6 on the 17th in 1998 31



Record highest total April rainfall
Total rainfall
for April 2014 (mm)
Previous wettest
for April
Years of
record
Average for
April
Kulin 83.4 80.0 in 1942 96 23.3
Mia Mia 89.4 85.4 in 2005 92 15.2
Learmonth Airport 195.8 129.5 in 1961 61 18.3
Amrista Park 100.0 83.4 in 1975 59 23.1
Giles Meteorological Office 124.8 123.8 in 2000 58 17.4
Exmouth Town 251.0 137.2 in 1980 43 24.3

Highest total April rainfall for at least 30 years
Total rainfall
for April 2014 (mm)
Most recent April
at least this wet
Years since
wetter
Average for
April
Corrigin 90.1 106.5 in 1951 63 23.0
St Albans 71.2 114.8 in 1951* 62 22.5
Emu Creek Station 78.2 78.8 in 1966 48 21.0
Quairading 81.0 91.6 in 1974 40 22.9
Wattening 59.2 64.0 in 1975 39 23.0
Yulmbu 72.2 127.5 in 1961* 35 22.1
Kalbarri 61.2 78.2 in 1984 30 19.5
Kondinin 56.4 59.0 in 1984 30 22.3
South Holmwood 62.6 89.4 in 1984 30 23.7

* 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
Highest temperature
in April 2014 (°C)
Previous warmest
for April
Years of
record
Average for
April
Derby Aero 40.7 on the 2nd 40.3 on the 14th in 1981 30 35.5



Summary statistics for April 2014
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2014
Diff
from
average
Highest for
April
2014
Mean for
April
2014
Diff
from
average
Lowest for
April
2014
Total for
April
2014
Average
for
April
Rank of
April
2014
Fraction of
April
average
North Kimberley (district 01)
Doongan 33.3 +0.2 35.6 3rd 19.6 +0.7 15.0 24th 120.4 50.5 high 238%
Kalumburu 35.7 +1.1 37.4 1st 22.2 +1.2 18.7 17th 36.4 38.9 average 94%
Mount Elizabeth 32.7 +0.2 35.3 3rd 17.7 +1.0 12.6 24th 74.8 40.2 high 186%
Troughton Island 33.6 +0.9 35.2 1st 27.5 +0.7 24.1 7th 35.8 33.0 average 108%
Truscott 33.5   35.2 1st 24.6   22.7 17th 166.8 90.2 high 185%
Wyndham 36.5 +0.7 39.2 1st 23.8 +0.2 19.8 23rd 49.0 36.3 high 135%
Wyndham Aero 37.4 +1.0 40.7 2nd 24.3 +1.0 20.4 20th 43.0 28.5 high 151%
East Kimberley (district 02)
Argyle Aerodrome 35.4 +0.6 39.2 3rd 23.9 +1.2 20.5 20th 78.8 28.1 v high 280%
Halls Creek Airport 34.0 +0.2 38.3 3rd 21.0 +0.6 15.7 21st 40.8 21.6 high 189%
Kununurra Aero 36.0 +0.8 39.3 1st 22.5 +0.6 17.5 20th 58.4 31.1 high 188%
Warmun 35.6 +0.5 40.0 2nd 22.1 +1.5 16.5 20th 65.7 25.7 high 256%
West Kimberley (district 03)
Bidyadanga 36.8 +1.2 41.0 3rd 21.9 -0.2 16.2 21st 0.2 25.1 average 1%
Broome Airport 34.6 +0.3 38.6 4th 22.6 0.0 18.0 20th 32.0 26.2 high 122%
Curtin Aero 36.9 +0.5 40.2 3rd 22.1 -0.1 15.8 25th 41.8 44.4 average 94%
Derby Aero 36.9 +1.4 40.7 2nd 22.8 +0.1 18.4 23rd 11.0 25.5 average 43%
Fitzroy Crossing Aero 37.2 +0.7 41.0 2nd 21.8 +1.2 17.2 20th 33.0 33.3 average 99%
Lombadina Airstrip 34.0   35.4 28th 23.4   20.1 17th 103.0
West Roebuck 35.6 +0.3 39.6 4th 21.1 -0.5 15.8 16th 27.0 34.5 high 78%
De Grey (district 04)
Bedout Island 33.2   36.0 4th 26.7   25.1 24th
Karratha Aero 34.7 +0.4 36.9 3rd 22.6 0.0 19.3 16th 3.2 17.2 average 19%
Legendre Island 32.6   36.0 20th 25.2   22.9 8th
Mandora 36.9 +0.8 40.9 3rd 19.8 -0.9 12.9 21st 0 19.5 lowest 0%
Marble Bar 36.9 +0.7 40.7 4th 20.7 -1.4 16.9 17th 0 17.3 v low 0%
Pardoo Station 35.6 +0.1 38.2 4th 20.5 -1.0 16.4 21st 0 18.9 lowest 0%
Port Hedland Airport 36.1 +0.9 39.1 12th 21.3 -0.1 17.6 17th 0.2 21.8 low 1%
Roebourne 36.9 +1.6 40.0 2nd 22.2 0.0 18.5 24th 0 28.2 lowest 0%
Roebourne Aero 36.6 +0.4 39.9 3rd 20.7 -1.1 16.7 19th 0 6.8 v low 0%
Shay Gap 36.5   40.2 4th 22.1   18.5 21st 0
Fortescue (district 05)
Barimunya 32.4   35.3 5th 19.0   14.4 16th 0
Barrow Island Airport 31.5 +0.4 34.1 19th 24.2 -0.4 21.7 17th 10.0 39.8 average 25%
Christmas Creek 34.0   37.7 4th 20.1   14.5 17th 0
Coondewanna 31.9   35.1 5th 16.0   9.8 17th 3.6
Fortescue Dave Forrest 34.0   37.0 5th 20.3   14.5 17th 0
Learmonth Airport 32.5 -0.7 36.7 12th 19.8 -0.6 16.2 29th 195.8 18.3 highest 1070%
Mardie 35.5 -0.4 39.1 12th 21.3 +0.2 17.7 8th 9.8 19.7 average 50%
Onslow Airport 34.1 +0.3 38.3 20th 21.9 +0.6 18.8 9th 19.6 12.0 high 163%
Wittenoom 34.3 +1.1 37.1 2nd 20.3 -0.9 16.3 18th 3.6 27.6 average 13%
West Gascoyne (district 06)
Carnarvon Airport 30.1 +1.0 39.5 13th 19.1 0.0 14.7 30th 8.0 13.8 average 58%
Denham 29.0 +0.4 38.0 13th 20.0 +0.3 12.8 30th 38.0 14.2 high 268%
Emu Creek Station 34.6 -0.3 39.1 12th 19.6 -1.2 16.9 17th 78.2 21.0 v high 372%
Murchison 31.8 +0.8 37.8 12th 17.1 +0.9 6.7 30th 10.6 22.0 average 48%
Shark Bay Airport 31.0 0.0 39.3 13th 18.4 +0.2 14.2 30th 29.2 10.7 high 273%
East Gascoyne (district 07)
Newman Aero 33.1 +1.3 36.6 5th 17.8 +0.4 12.2 17th 8.4 19.1 average 44%
Paraburdoo Aero 34.5 +0.9 38.9 4th 19.5 -0.2 15.8 21st 0.6 26.2 v low 2%
Murchison (district 07A)
Meekatharra Airport 30.7 +1.4 35.7 5th 17.0 -0.1 8.4 30th 2.8 19.7 low 14%
Mount Magnet Aero 29.6 +0.7 35.8 19th 16.9 +0.7 6.5 30th 22.0 20.6 average 107%
North Coast (district 08)
Dalwallinu 27.4 +0.2 35.6 13th 13.4 +0.2 6.8 29th 22.8 10.3 high 221%
Geraldton Airport 28.8   36.4 11th 14.4   9.9 30th 50.0
Kalbarri 29.7 +0.3 36.0 13th 16.5 +0.3 9.2 29th 61.2 19.5 v high 314%
Morawa Airport     34.6 18th 15.0 +0.6 8.6 30th 69.4 16.2 v high 428%
Mullewa 30.0 +1.2 36.7 13th 16.5 +1.5 9.5 29th 58.6 21.3 high 275%
North Island 26.1 -0.2 29.3 9th 20.7 +0.3 17.4 29th 47.2 16.8 high 281%
Wongan Hills 27.2 +0.8 35.5 12th 13.3 -0.1 6.0 29th 26.2 22.2 average 118%
Central Coast (district 09)
Badgingarra Research Stn 27.8 +0.6 36.4 13th 13.8 +0.3 8.2 30th 43.4 27.4 high 158%
Bickley 24.2 +0.5 32.2 13th 12.9 +0.2 8.0 22nd 45.0 55.1 average 82%
Champion Lakes 26.0   34.1 11th 15.4   7.9 29th 29.8
Garden Island HSF 23.5 -0.4 32.6 10th 16.6 +0.6 11.9 29th 12.8 40.9 v low 31%
Gingin Aero 27.0 +0.3 35.1 13th 11.5 -0.6 3.7 22nd 27.0 26.3 average 103%
Gosnells City 27.4 +1.0 35.5 11th     8.0 29th 34.9 44.0 average 79%
Jandakot Aero 26.2 +0.4 34.4 11th 12.2 -0.2 5.0 29th 22.2 42.4 average 52%
Karnet 24.0 +0.7 31.7 11th 12.2 +0.4 5.5 29th 32.2 66.7 average 48%
Lancelin 26.8 +1.3 36.0 11th 14.7 +0.2 7.5 22nd 37.0 30.8 average 120%
Pearce RAAF 27.8 +1.4 36.3 13th 12.7 -0.7 5.7 22nd 23.6 34.5 average 68%
Perth Airport 26.9 +1.3 35.0 11th 13.1 +0.1 5.6 22nd 17.8 40.6 low 44%
Perth Metro 26.5 +0.6 34.6 11th 14.1 +0.3 7.5 29th 24.6 43.9 average 61%
Rottnest Island 23.9 +0.1 32.1 10th 17.7 +0.4 14.0 29th 27.0 36.0 average 75%
Swanbourne 26.1 +0.7 35.6 11th 15.4 +0.2 8.3 22nd
South Coast (district 09A)
Albany 21.4 +0.5 26.0 12th 14.0 +1.2 9.0 22nd 33.0 68.7 low 48%
Albany Airport 23.3   31.5 11th 11.5   5.1 22nd 25.8
Bridgetown 24.3 +0.8 33.0 12th 8.8 -0.5 2.0 22nd 7.0 47.5 low 15%
Bunbury 25.7 +1.5 33.3 10th 11.0 -0.8 4.2 30th 16.6 34.2 low 49%
Busselton Aero 24.7 +0.6 31.2 10th 10.4 -0.7 4.0 22nd 6.2 33.4 low 19%
Cape Leeuwin 22.4 +1.1 29.7 9th 16.3 +0.9 12.5 28th 32.4 59.7 low 54%
Cape Naturaliste 23.3 +1.4 29.9 10th 14.5 +0.6 10.1 2nd 15.6 43.7 low 36%
Collie East 25.0 +1.2 32.3 12th 8.4 -0.6 2.3 23rd 13.2 46.2 low 29%
Donnybrook 26.1 +2.0 32.7 11th 11.2 +0.8 4.5 30th 9.2 49.2 v low 19%
Dwellingup 24.4 +1.9 31.7 11th 10.9 +0.6 4.1 29th 26.0 66.1 low 39%
Esperance 23.4 +0.2 32.6 14th 13.7 +0.4 6.6 23rd 16.0 45.4 low 35%
Esperance Aero 24.9 +1.4 32.4 14th 12.4 -0.4 5.6 23rd 11.0 39.9 low 28%
Jarrahwood 25.3 +1.5 32.1 12th 8.1 -0.5 0.9 22nd 10.4 47.0 low 22%
Mandurah 24.8 +0.8 33.3 11th 16.0 +0.2 11.7 29th 15.0 40.7 low 37%
Manjimup 23.2 +2.1 32.1 12th 11.2 +0.4 6.5 23rd 22.0 59.7 low 37%
North Walpole 22.4 +0.9 31.2 11th 13.1 +0.4 8.7 22nd 48.6 86.1 low 56%
Pemberton 22.8 +1.6 31.2 11th 12.0 +1.0 7.1 22nd 31.1 74.4 low 42%
Rocky Gully 23.2 +1.1 34.0 12th 10.7 -0.3 5.5 22nd 28.4 50.1 average 57%
Windy Harbour 22.1 0.0 30.2 9th 12.8 +0.6 7.6 3rd 44.0 69.2 average 64%
Witchcliffe 23.0 +0.3 31.0 11th 11.2 +0.1 5.2 22nd 22.6 65.0 low 35%
North Central (district 10)
Bencubbin 26.6 +0.7 33.3 14th 13.9 +1.1 5.7 29th 31.2 22.5 high 139%
Cunderdin Airfield 27.1 +0.4 35.8 13th 12.1 0.0 4.5 22nd 54.2 24.4 high 222%
Kellerberrin 26.9 +1.2 35.0 13th 11.2 -0.5 3.4 22nd 7.4 20.9 low 35%
Merredin 26.8 +1.3 34.0 14th 13.5 +0.7 4.2 29th 27.0 22.9 average 118%
Northam 27.1 +1.0 36.0 14th 12.9 +0.9 5.0 22nd 48.8 23.3 high 209%
York 26.9 +0.5 35.5 14th 10.6 -0.3 2.6 22nd 55.5 20.5 high 271%
South Central (district 10A)
Beverley 27.6 +1.4 36.4 14th 11.9 +0.6 4.6 29th 34.6 23.0 high 150%
Brookton 26.0 +1.0 34.5 14th 12.0 +0.8 3.4 29th 14.3 25.6 average 56%
Corrigin 25.7 +1.5 34.2 14th 11.9 +0.7 4.6 30th 90.1 23.0 v high 392%
Hyden 27.2 +1.5 35.0 13th 11.5 +0.4 3.9 29th 37.1 23.6 high 157%
Jacup 24.0 +1.0 33.7 14th 10.8 0.0 4.6 2nd 65.6 43.5 high 151%
Katanning 24.0 +0.5 33.3 12th 11.2 +0.1 4.2 2nd 18.8 30.6 average 61%
Lake Grace 24.7 +0.3 33.4 14th 12.3 +0.4 5.8 22nd 47.4 25.0 high 190%
Narembeen 26.1 +0.2 34.7 13th 12.5 +0.5 5.9 30th 35.7 22.9 high 156%
Narrogin 24.7 +1.7 34.0 12th 11.2 +0.7 4.5 29th 15.8 29.3 average 54%
Newdegate Research Station 25.1 +0.8 33.5 14th 9.6 -0.7 1.9 2nd 62.0 26.8 high 231%
Ongerup 24.2 +1.4 33.4 14th 11.4 +0.2 4.6 2nd 19.0 26.1 average 73%
Pingelly 25.4 +1.3 34.2 12th 12.5 +0.7 4.4 29th 14.5 26.9 average 54%
Ravensthorpe 24.8 +1.0 33.9 14th 11.8 0.0 6.0 22nd 33.3 33.0 average 101%
Wagin 24.5 +0.8 33.5 12th 11.4 +0.7 4.9 22nd 14.0 28.7 average 49%
Wandering 25.1 +0.4 34.1 12th 9.3 -0.3 1.0 22nd 18.0 30.4 average 59%
Eucla (district 11)
Balladonia 25.7 +0.7 33.8 19th 10.9 0.0 4.6 22nd 18.7 19.6 average 95%
Eucla 23.7 +0.1 34.9 20th 14.7 +1.4 10.2 23rd 57.0 26.7 v high 213%
Eyre 24.4 +0.3 32.8 17th 11.2 -0.7 2.3 4th 26.6 25.1 average 106%
Forrest 25.8 -0.6 34.7 20th 13.1 +1.1 7.8 30th 26.8 19.2 average 140%
Red Rocks Point 23.5   31.8 17th 15.2   10.0 30th 13.2 28.3 average 47%
South East (district 12)
Bulga Downs 27.9 -1.2 34.0 19th 13.7 -0.7 6.6 30th 25.8 21.0 average 123%
Kalgoorlie-Boulder Airport 25.4 +0.1 32.7 19th 13.4 +0.7 5.6 29th 21.4 20.6 high 104%
Laverton Aero 26.5 -0.4 33.5 20th 15.0 0.0 7.5 29th 50.2 20.0 v high 251%
Leinster Aero 27.9 0.0 34.2 20th 14.8 -0.7 7.0 30th 11.8 26.0 average 45%
Leonora 26.3 -1.7 33.8 19th 14.3 -0.5 6.2 30th 32.7 20.4 high 160%
Leonora Aero 26.4   33.6 20th 14.5   6.3 30th 30.8
Mount Keith 28.5   33.9 23rd 15.0   6.4 30th 20.8
Munglinup West 25.2 +0.8 33.2 14th 11.8 -0.5 5.9 23rd 15.2 33.5 low 45%
Norseman Aero 25.5 +0.1 33.1 19th 11.4 +0.4 2.7 2nd 25.6 25.9 average 99%
Salmon Gums Res.Stn. 25.4 +1.6 33.1 15th 10.2 +0.3 1.8 22nd 10.4 26.9 low 39%
Southern Cross Airfield 26.4 0.0 33.1 13th 12.7 +1.1 4.5 29th 39.8 24.3 high 164%
Yeelirrie 30.5 +1.6 34.7 21st 12.6 -1.4 8.0 15th 3.4 24.4 low 14%
North East (district 13)
Carnegie 30.9 +0.7 36.8 1st 16.2 0.0 7.5 30th 2.8 22.6 average 12%
Giles Meteorological Office 28.6 -0.8 35.5 1st 16.0 -0.5 11.2 30th 124.8 17.4 highest 717%
Telfer Aero 35.0 +0.5 38.3 1st 20.3 -0.3 15.6 22nd 0.6 19.6 average 3%
Warburton Airfield 29.9 +0.5 38.7 1st 16.7 +1.5 7.5 30th 52.2 18.6 high 281%
Wiluna 30.7 +1.5 35.9 20th 15.8 +0.7 6.3 30th 1.0 29.1 low 3%
Offshore Islands (district 200)
Adele Island 31.7   32.8 18th 27.8   25.9 9th
Browse Island 31.8   33.3 19th 28.4   26.8 8th
Cocos Island Airport 30.9 +1.2 31.8 22nd 26.3 +1.1 23.9 20th 221.0 253.5 average 87%
Varanus Island 31.4 +0.2 34.0 20th 26.2 +0.1 25.4 7th 4.4 41.7 average 11%

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 Thursday 1 May 2014. 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.

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