Western Australia in March 2013: Wet in the southwest

  • Rainfall: near average for WA; very much above average for southwest WA
  • Maximum temperature: near average for WA; below average for southwest WA
  • Minimum temperature: above average for WA; near average for southwest WA

Rainfall

Rainfall during March 2013 was above to very much above average in the Southwest Land Division (SWLD), Goldfields, and Southern Interior, largely due to rainfall events in early, middle, and latter parts of the month, and sites in the Lower West, South and Southeast Coastal recorded their wettest March on record as a result. Below to very much below average rainfall mainly confined to the coastal Kimberley and much of the Pilbara.

Averaged across the state as a whole, rainfall during March 2013 was close to average for WA, while for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) rainfall was very much above average, ranking as the 12th wettest March on record.

The passage of ex-tropical cyclone Rusty through central parts of the State at the start of March, after crossing the coast east of Port Hedland on 27 February, brought moderate to heavy rainfall to the Southern Interior and Goldfields. Several sites in the western Southern Interior and Goldfields observed their wettest March day on record on the 1st and 2nd, including Kalgoorlie-Boulder Airport with 88.2 mm in the 24 hours to 9am on the 2nd, breaking its 74 year March record of 70.0 mm on 2nd March 1974. Menzies, to the north of Kalgoorlie in the Goldfields, also reported a notable fall on the same day, with 83.0 mm, its wettest March day in 107 years of record. Lorna Glen in the Southern Interior recorded the highest daily total of the event, and the month, in WA with 107.5 mm on the 1st, which was also its second wettest day in March in 68 years of record behind the record of 152.4 mm set on 27 March 1942.

A middle level trough produced widespread moderate rainfall in the SWLD, southern Gascoyne, and Goldfields on the 10th and into the morning on the 11th, with some heavy falls reported from thunderstorms. Dog Hill (Lower West) received 71.6 mm of rainfall in the 24 hours to 9am on the 11th, and rainfall between midnight and 3am on the 11th were greater than a 1 in 100 year event. Unofficial reports indicated rainfall in the Baldivis area was likely to have been between 60 and 80 mm. The SWLD received another notable rainfall event on the 14th as a result of a nearby middle level trough. Widespread falls between 30 and 50 mm were reported in the Lower West and Great Southern, and Ravensthorpe in the Southeast Coastal reported 52.0 mm on the 15th, its equal highest March daily fall in 107 years of record.

A strong cold front and deep pre-frontal trough combined to produce widespread moderate rainfall in the SWLD and neighbouring Gascoyne between the 25th and 27th. Widespread falls between 20 and 40 mm were reported, with Beaumont West in the Southeast Coastal recording its highest March daily fall in 32 years of record with 56.0 mm, whilst Desert Fringe in the southeast Great Southern recorded 80.0 mm on the 26th, its highest March daily fall in 30 years of record and the highest daily fall reported during the event.

In the north, particularly in the Kimberley, thunderstorms were active during the first half of March and, after a quiet period, became active again in last few days of the month. Some moderate to heavy falls were registered during the storm activities. Little monsoonal activity occurred over northern WA during March 2013.

Maximum temperature

Maximum temperatures during March 2013 were above average over large parts of the Kimberley, Pilbara, Northern Interior, and eastern Eucla much of northern and eastern WA, with mean maxima up to 3 °C warmer than normal in the eastern Eucla and eastern Northern Interior. Much of the SWLD, southern Goldfields, and western Eucla were below average with an area centred on the Southeast Coastal very much below average. The southeast Goldfields, far eastern Southeast Coastal, and western Eucla saw daytime temperatures up to 4 °C cooler than normal. A lack of rainfall events in the north, and higher than normal frequency of rainfall events in the south had a significant impact on the WA maximum temperature anomalies.

When averaged across the state as a whole, the mean maximum temperature for WA for March 2013 was near average, though slightly above, continuing a run of monthly mean maxima for WA above the average since April 2012. Averaged across the Lower Southwest, the mean maximum temperature was below average, the first below average month for the region since February 2012, and only the third since October 2009.

Extremely warm sea surface temperatures off the northwest coast helped to bring consecutive hot days to the Pilbara coast and offshore islands between the 16th and 23rd. Roebourne recorded the highest temperature of the month in WA on the 20th with 46.0 °C, which was its forth hottest day in March on record and the hottest March day at the site for eight years, since 46.9 °C was recorded on 1 March 2005. It was the latest occurrence of a daily maximum temperature of 46.0 °C or higher in autumn in WA and Australia. The previous record for the latest 46.0 °C or greater day in the autumn season was 13 March with 46.1 °C recorded at Marble Bar on 13 March 1911.

A cool southerly air flow in the wake of a cold front on the 26th resulted in daily maxima only reaching the mid-high teens over parts of the SWLD. Newdegate Research Station (Great Southern) recorded the lowest day-time temperature of the month in WA with a maximum of 14.6 °C, whilst Hyden (Great Southern) registered a daily maximum temperature of 16.0 °C on the same day, its coolest day in March in 39 years of record.

Minimum temperatures

Minimum temperatures during March 2013 were above to very much above average across much of northern and eastern WA. Overnight temperatures up to 5 °C above average occurred in the eastern Northern Interior, whilst minima up to 4 °C above average were reported in the Eucla district. In western, inland central, and southern parts of WA, mean minimum temperatures were generally near average.

When averaged across WA as a whole, the mean minimum temperature during March 2013 was above average, whilst is the Lower Southwest the mean overnight minimum was close to normal.

Gascoyne Junction observed the highest daily minimum temperature of the month in WA with 32.1 °C on the 8th, which was also its hottest March night on record.

Persistent northerly winds overnight on the 25th and into the morning of the 26th saw Eucla experience its highest daily minimum temperature in March with a minimum temperature of 27.1 °C on the 26th, breaking the previous March record of of 26.5 °C on 11 March 2005.

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Extremes in March 2013
Hottest day 46.0 °C at Roebourne on the 20th
Warmest days on average 40.0 °C at Roebourne
Coolest days on average 21.9 °C at Albany
Coldest day 14.6 °C at Newdegate Research Station on the 26th
Coldest night 2.7 °C at Eyre on the 22nd
Coolest nights on average 11.0 °C at Jarrahwood
Warmest nights on average 27.8 °C at Troughton Island
26.9 °C at Broome Airport (mainland)
Warmest night 32.1 °C at Gascoyne Junction on the 8th
Wettest overall 208.0 mm at Dimond Gorge
Wettest day 107.5 mm at Lorna Glen on the 1st
Highest wind gust 111 km/h at Mount Magnet Aero on the 16th
111 km/h at Warburton Airfield on the 26th

Maps

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 March daily rainfall
Highest daily rainfall
in March 2013 (mm)
Previous wettest
for March
Years of
record
Menzies 83.0 on the 2nd 62.0 on the 11th in 2000 107
Ravensthorpe 52.0 on the 15th =52.0 on the 2nd in 2006 107
Kalgoorlie-Boulder Airport 88.2 on the 2nd 70.0 on the 2nd in 1974 75
Cowarna Downs 60.2 on the 2nd 48.6 on the 2nd in 1974 44
Beaumont West 56.0 on the 2nd 48.2 on the 11th in 2000 32
Granite Peak 81.0 on the 1st 56.3 on the 25th in 1999 32
Desert Fringe 80.0 on the 26th 53.4 on the 20th in 1993 30



Record highest total March rainfall
Total rainfall
for March 2013 (mm)
Previous wettest
for March
Years of
record
Average for
March
Ravensthorpe 125.9 117.5 in 1926 112 31.8
Wanneroo 70.4 54.4 in 1990 67 16.5
Tamar 134.8 112.0 in 1993 52 35.5
Telina Downs 167.6 127.0 in 2000 50 32.2
Mettler 155.0 122.5 in 1967 47 41.2
Erinair 160.9 128.0 in 1985 46 31.9
Esperance 148.0 111.8 in 2000 44 30.2
Swan View 82.8 64.8 in 1990 40 17.1
Beaumont West 140.6 121.4 in 2000 31 32.2
Merivale Farm 145.8 133.0 in 2000 31 37.1




Record lowest March daily maximum temperature
Lowest daily maximum
temperature
in March 2013 (°C)
Previous coolest
for March
Years of
record
Average for
March
Hyden 16.0 on the 26th 16.8 on the 15th in 1992 39 30.0

 




Record highest March daily minimum temperature
Highest daily minimum
temperature
in March 2013 (°C)
Previous warmest
for March
Years of
record
Average for
March
Eucla 27.1 on the 26th 26.5 on the 11th in 2005 54 15.9
Gascoyne Junction 32.1 on the 8th 31.2 on the 7th in 1988 41 22.5


Summary statistics for March 2013
Maximum temperatures
for March
(°C)
Minimum temperatures
for March
(°C)
Rainfall
for March
(millimetres)
Mean for
March
2013
Diff
from
average
Highest for
March
2013
Mean for
March
2013
Diff
from
average
Lowest for
March
2013
Total for
March
2013
Average
for
March
Rank of
March
2013
Fraction of
March
average
North Kimberley (district 01)
Doongan 34.3 +1.2 37.0 17th 22.7 +0.8 21.1 25th 140.5 207.1 average 68%
Kalumburu 34.5 +1.1 37.0 17th 23.2 -0.3 17.3 19th 45.0 234.9 v low 19%
Mount Elizabeth 33.9 +1.6 37.0 22nd 21.1 +0.7 14.9 21st 88.9 163.3 average 54%
Troughton Island 32.8 +0.9 34.3 21st 27.8 +1.4 24.6 10th 47.6 141.8 low 34%
Truscott 32.8   35.0 17th 25.8   23.4 10th 131.0
Wyndham 37.1 +1.2 40.0 21st 26.1 +0.7 24.0 20th 85.1 161.4 average 53%
Wyndham Aero 37.4 +2.0 40.5 23rd 26.1 +0.6 24.0 13th 64.8 155.0 low 42%
East Kimberley (district 02)
Argyle Aerodrome 37.1 +2.0 40.4 23rd 25.2 +0.7 22.1 21st 111.8 163.1 average 69%
Halls Creek Airport 36.0 +0.7 39.8 23rd 23.6 +0.8 20.4 22nd 153.8 82.7 high 186%
Kununurra Aero 36.5 +1.0 39.3 18th 24.7 +0.5 21.2 20th 48.2 154.7 low 31%
Warmun 37.4 +1.6 40.8 23rd 23.9 +0.7 16.8 21st 78.1 121.0 average 65%
West Kimberley (district 03)
Bidyadanga 34.8 -0.5 39.4 20th 26.1 +1.2 23.2 31st 22.9 97.6 low 23%
Broome Airport 33.7 -0.2 36.4 28th 26.9 +1.5 23.5 11th 19.8 101.6 low 19%
Curtin Aero 36.7 +0.7 40.7 20th 24.2 0.0 21.5 3rd 128.8 172.1 average 75%
Derby Aero 35.8 +0.7 39.5 20th 25.3 +0.3 22.1 15th 110.8 135.3 average 82%
Fitzroy Crossing Aero 37.9 +1.5 41.5 23rd 24.2 +0.3 21.3 20th 114.2 127.8 average 89%
West Roebuck 34.7 +0.1 38.7 20th 25.4 +1.2 22.6 3rd 5.8 160.2 v low 4%
De Grey (district 04)
Karratha Aero 37.3 +1.4 43.1 20th 26.4 +0.7 23.0 30th 0 50.0 lowest 0%
Legendre Island 34.3   36.4 25th 27.5   25.0 27th
Mandora 35.8 -1.1 41.3 24th 25.3 +1.4 23.0 31st 2.8 74.2 low 4%
Marble Bar 39.4 +2.2 43.4 20th 25.3 +0.4 20.4 1st 6.0 80.9 low 7%
Pardoo Station 36.7 +0.6 41.5 21st 25.8 +1.4 20.5 20th 7.4 64.1 average 12%
Port Hedland Airport 36.7 0.0 41.1 6th 25.5 +1.0 21.2 1st 18.2 49.6 average 37%
Roebourne 40.0 +2.4 46.0 20th 26.0 +0.7 22.0 1st 0 64.0 lowest 0%
Roebourne Aero 39.7 +2.6 45.5 20th 25.5 +0.4 21.4 1st 0 43.9 v low 0%
Fortescue (district 05)
Barrow Island Airport 33.5 +0.4 37.8 19th 26.6 +0.1 23.1 30th 0 56.4 v low 0%
Learmonth Airport 37.0 +0.6 43.1 21st 22.8 -0.1 17.6 27th 0 38.5 lowest 0%
Mardie 38.0 +0.4 45.3 20th 25.2 +1.1 20.2 27th
Onslow Airport 36.6 +0.6 45.6 21st 25.1 +1.1 20.5 27th 0 71.8 lowest 0%
Wittenoom 37.7 +1.1 41.5 20th 24.5 +0.2 19.8 31st 23.4 69.0 average 34%
West Gascoyne (district 06)
Carnarvon Airport 32.2 +0.6 41.3 13th 22.4 +0.3 14.5 30th 2.4 16.2 average 15%
Denham 31.4 +0.3 42.5 8th 22.0 0.0 15.8 27th 2.0 14.2 average 14%
Emu Creek Station 38.9 +0.5 44.6 7th 23.7 -0.1 17.5 26th 20.2 39.9 average 51%
Murchison                 18.4 32.4 average 57%
Shark Bay Airport 33.5 -0.7 43.9 8th 21.1 -0.1 14.0 30th 0.8 13.5 average 6%
East Gascoyne (district 07)
Newman Aero 36.6 +1.9 41.4 19th 22.9 +1.5 15.3 31st 24.8 40.1 average 62%
Paraburdoo Aero 38.8 +2.4 43.2 17th 24.2 +1.1 18.7 27th
Murchison (district 07A)
Meekatharra Airport 34.5 +0.3 41.5 18th 20.5 -0.8 12.8 27th 13.4 28.5 average 47%
Mount Magnet Aero 33.4 +0.5 40.2 19th 19.4 -0.6 11.4 27th 34.2 35.3 average 97%
Paynes Find                 8.8 24.5 average 36%
North Coast (district 08)
Carnamah 30.6 -2.2 37.7 3rd 16.5 -0.8 9.0 27th 33.9 20.3 high 167%
Dalwallinu 29.4 -2.3 36.8 19th 15.6 -0.7 8.6 27th 39.8 23.5 high 169%
Geraldton Airport 30.1   40.3 8th 17.3   11.0 28th 54.6
Geraldton Airport Comparison 30.2 -0.8 40.7 8th 17.2 -0.7 10.2 28th 53.8 16.1 v high 334%
Kalbarri 31.7 -1.0 41.4 8th 18.6 -0.6 11.9 27th 34.5 12.1 high 285%
Morawa Airport 32.1 -1.2 38.3 8th 17.3 -0.6 9.5 27th 23.8 15.4 high 155%
Mullewa 33.0 -0.7 40.0 8th 17.9 -0.4 10.2 27th 19.4 18.7 high 104%
North Island 28.0 -0.3 31.5 8th 21.6 -0.4 15.4 26th 41.2 5.7 v high 723%
Wongan Hills 29.0 -2.0 36.2 19th 15.5 -0.9 8.0 27th 40.8 20.3 high 201%
Central Coast (district 09)
Badgingarra Research Stn 29.3 -2.7 35.8 8th 15.6 -0.8 9.6 27th 48.6 16.4 high 296%
Bickley 25.8 -2.4 31.8 9th 13.9 -0.6 8.0 12th 73.6 25.2 v high 292%
Champion Lakes 27.6   34.3 9th 16.7   8.9 27th 72.8
Garden Island HSF 25.4 -2.1 33.8 9th 17.9 -0.3 11.8 27th 39.4 14.6 high 270%
Gingin Aero 28.8 -2.1 35.2 9th 14.5 -0.7 5.7 27th
Gosnells City 29.0 -1.6 36.4 9th         75.6 16.9 v high 447%
Jandakot Aero 28.1 -1.6 35.0 9th 14.8 -0.6 5.3 27th 61.6 16.1 v high 383%
Karnet 25.9 -2.0 31.6 9th 14.0 -0.1 5.9 27th 55.0 24.0 high 229%
Lancelin 27.9 -0.6 37.0 9th 16.0 -0.7 10.0 12th 40.6 14.3 high 284%
Medina Research Centre 27.8 -1.6 35.1 1st 15.5 -0.4 7.8 27th 53.1 19.5 v high 272%
Pearce RAAF 29.4 -1.1 35.2 9th 15.6 -0.4 6.6 27th 61.2 15.1 v high 405%
Perth Airport 28.4 -1.3 35.2 9th 15.2 -0.7 6.2 27th 33.0 15.9 high 208%
Perth Metro 28.0 -1.7 34.8 9th 16.1 -0.5 8.2 27th 69.6 19.2 v high 363%
Rottnest Island 25.1 -1.1 30.9 9th 18.4 -0.3 12.5 26th 60.6 14.3 high 424%
Swanbourne 27.8 -1.2 36.9 9th 16.3 -1.1 10.2 27th 64.8 22.3 v high 291%
South Coast (district 09A)
Albany 21.9 -0.4 27.6 4th 16.1 +1.4 11.9 27th 86.0 38.5 v high 223%
Albany Airport 22.6   28.8 4th 13.7   8.6 31st 89.6
Albany Airport Comparison 22.5 -1.6 28.8 4th 13.9 +0.5 8.4 14th 79.0 33.6 v high 235%
Bridgetown 24.6 -3.1 32.3 3rd 11.3 -0.3 4.7 13th 39.4 18.1 high 218%
Bunbury 26.2 -1.6 34.1 1st 13.5 -0.7 5.8 12th 37.4 15.4 high 243%
Busselton Aero 26.1 -2.0 33.4 1st 12.6 -0.7 5.6 28th 15.6 14.9 average 105%
Cape Leeuwin 22.9 +0.2 26.6 10th 17.4 +0.7 13.4 26th 24.2 27.9 average 87%
Cape Naturaliste 24.9 +0.4 30.5 9th 15.4 +0.4 11.5 27th 25.8 22.5 high 115%
Collie East 25.7 -3.0 32.3 1st 11.5 -0.3 4.3 12th 27.4 13.7 high 200%
Donnybrook 26.2 -1.8 33.5 1st 13.3 +0.4 6.7 12th 43.4 24.4 high 178%
Dwellingup 25.9 -1.1 32.3 1st 13.0 +0.1 5.1 27th 70.8 26.4 high 268%
Esperance 23.5 -1.7 36.8 4th 15.7 +0.6 10.4 22nd 148.0 30.2 highest 490%
Esperance Aero 24.4 -1.5 35.7 4th 14.7 +0.2 8.8 22nd 153.8 34.1 v high 451%
Harvey 26.9 -2.5 33.5 1st         58.4 14.6 v high 400%
Jarrahwood 26.3 -1.4 33.7 2nd 11.0 -0.6 3.9 13th 37.6 18.6 high 202%
Mandurah 26.5 -1.4 34.2 9th 17.4 -0.8 10.9 27th 38.2 16.0 high 239%
Manjimup 23.1 -1.7 32.3 1st 12.7 +0.2 7.8 21st 34.2 29.9 average 114%
North Walpole 22.5   29.9 1st 14.7   10.8 31st 44.8 33.6 high 133%
Pemberton 23.2 -1.3 32.0 1st 13.7 +1.0 8.5 24th 33.8 36.6 average 92%
Rocky Gully 23.3 -2.1 30.5 3rd 12.1 -0.3 6.4 30th 29.8 34.5 average 86%
Windy Harbour 22.4 -1.1 30.2 10th 14.4 +0.9 9.9 14th 42.4 30.7 average 138%
Witchcliffe 24.9 -1.1 32.9 1st 13.3 +0.4 7.6 30th 45.8 21.5 v high 213%
North Central (district 10)
Bencubbin 28.7 -2.1 37.0 19th 15.3 -0.9 7.9 27th 41.2 22.8 high 181%
Cunderdin Airfield 29.0 -2.1 37.0 19th 15.3 +0.1 8.2 27th 30.0 16.3 high 184%
Merredin 28.7 -1.6 35.8 19th 15.1 -1.1 6.8 27th 55.2 20.4 v high 271%
Northam 29.2 -1.6 36.1 19th 15.3 -0.1 7.1 27th 65.7 18.5 v high 355%
York 28.7 -2.1 36.0 19th 14.2 +0.1 7.0 27th 56.7 16.8 high 338%
South Central (district 10A)
Beverley 29.2 -1.6 35.6 3rd 14.4 -0.3 6.8 27th 45.0 16.4 v high 274%
Brookton 27.4 -2.1 34.1 19th 14.3 0.0 5.6 27th 59.2 18.0 v high 329%
Corrigin 27.2 -1.7 34.1 19th 14.3 0.0 7.2 27th 37.5 21.2 high 177%
Hyden 27.8 -2.2 34.5 19th 13.3 -0.9 0.0 30th 56.9 20.1 high 283%
Jacup 23.9 -2.0 33.3 4th 12.3 -0.2 6.6 21st        
Katanning 24.0 -3.5 30.4 3rd 12.6 -0.3 7.2 22nd 66.4 18.1 v high 367%
Lake Grace 25.7 -2.6 31.5 19th 13.8 -0.5 8.6 28th 57.6 18.3 v high 315%
Narembeen 28.7 -1.6 35.2 19th 14.9 +0.1 7.4 27th 33.3 20.2 high 165%
Narrogin 25.7 -1.6 33.0 19th 13.1 +0.1 6.4 27th 43.6 20.6 high 212%
Newdegate Research Station 25.5 -2.7 32.4 4th 12.7 +0.1 7.2 28th 73.4 21.2 v high 346%
Ongerup 23.8 -2.2 30.5 4th 12.8 -0.4 7.4 22nd 50.4 22.2 high 227%
Pingelly 26.6 -1.8 33.8 19th 13.9 -0.8 6.7 27th 59.8 17.2 v high 348%
Ravensthorpe 24.3 -2.4 34.3 4th 12.4 -1.2 4.0 30th 125.9 31.8 highest 396%
Wagin 25.4 -2.3 32.7 3rd 13.4 0.0 7.7 13th 80.7 20.3 v high 398%
Wandering 26.4 -2.8 33.9 19th 12.2 -0.2 5.5 27th 62.0 15.8 v high 392%
Eucla (district 11)
Balladonia 25.2 -2.9 35.6 5th 16.0 +2.5 8.9 14th 145.9 28.2 v high 517%
Eucla 27.5 +2.3 38.9 4th 17.3 +1.4 9.4 31st 43.2 23.0 high 188%
Eyre 26.7 +1.0 38.4 25th 14.3 0.0 2.7 22nd 61.4 27.7 high 222%
Forrest 31.4 +2.4 43.6 11th 16.2 +1.9 9.4 29th 9.6 27.4 average 35%
Red Rocks Point 25.4   37.8 3rd 17.6   9.9 22nd 24.6 26.8 average 92%
South East (district 12)
Bulga Downs 32.4 -0.4 40.9 18th 18.3 0.0 11.2 27th 36.0 24.2 high 149%
Kalgoorlie-Boulder Airport 26.8 -2.7 35.8 25th 15.1 -0.9 8.2 27th 133.8 26.1 v high 513%
Laverton Aero 31.1 +0.8 40.0 19th 18.5 +0.4 12.0 27th 45.2 37.5 average 121%
Leinster Aero 32.0 +0.7 39.2 19th 18.9 0.0 12.5 29th        
Leonora 31.6 -1.0 40.0 18th 18.3 -0.3 11.6 27th 72.0 29.2 v high 247%
Leonora Aero 31.0   39.3 19th 18.7   11.6 27th 65.8
Munglinup West 24.4 -2.7 35.4 4th 13.7 -0.1 8.1 22nd        
Norseman Aero 25.4 -3.3 36.2 25th 13.6 -0.4 5.6 27th 112.0 34.3 high 327%
Salmon Gums Res.Stn. 24.1 -3.2 36.3 4th 12.9 +0.3 5.3 28th 144.6 26.3 v high 550%
Southern Cross Airfield 29.1 -1.5 37.7 25th 14.9 -0.1 6.4 27th 37.6 35.7 average 105%
Yeelirrie 32.7 -0.5 39.6 19th 18.1 -0.1 10.1 30th        
North East (district 13)
Carnegie 35.2 +1.4 42.4 19th 20.2 +0.4 13.8 31st 95.0 34.1 high 279%
Giles Meteorological Office 33.6 -0.1 39.3 20th 22.2 +1.7 13.6 30th 70.0 36.7 high 191%
Telfer Aero 38.7 +1.4 43.1 16th 25.3 +1.4 18.1 30th 7.6 77.3 low 10%
Warburton Airfield 34.5 +0.6 42.1 20th 21.7 +1.8 12.7 31st 46.8 31.4 high 149%
Wiluna 33.6 -0.4 41.0 18th 20.3 +0.7 13.2 28th 64.9 35.8 high 181%
Offshore Islands (district 200)
Christmas Island Aero 28.9 +0.7 30.0 11th 23.8 +0.8 22.3 11th 224.8      
Cocos Island Airport 30.1 +0.1 30.7 20th 25.5 +0.3 23.2 24th 411.8 232.0 v high 178%
Varanus Island 33.4 +0.8 39.0 21st 27.2 +0.2 24.7 27th 0 47.5 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 Tuesday 2 April 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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Enquiries