Western Australia in March 2011: Cool and wet in the north, but hot and dry in the southwest

  • Rainfall: Above average rainfall for WA, but the tenth driest March on record in southwest WA
  • Maximum temperature: Fifth lowest March on record for WA, but third hottest March in southwest WA
  • Minimum temperature: Near average for WA, but fourth warmest March in southwest WA

Rainfall

Rainfall during March 2011 was above to very much above average for most of central and eastern WA (see March 2011 rainfall totals & deciles), with parts of the central and eastern Kimberley observing their wettest March on record. In contrast, much of the Southwest Land Division (SWLD), as well as parts of the western and southern Pilbara, Gascoyne, and Goldfields saw below to very much below average March rainfall. When averaged across the state, rainfall in March 2011 was above average, however the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) recorded its tenth driest March since comparable records commenced in 1900.

Extremely heavy rainfall was observed in the central and eastern Kimberley during March, with more than 700 mm falling during the month over the Kimberley Plateau, as the result of an active monsoon trough. The majority of this rainfall occurred between 8 and 14 March due to a nearby slow moving tropical low, causing extensive flooding and infrastructure damage across the Fitzroy, Ord and Pentecost River catchments. Substantial damage to houses occurred in the community of Warmun, and the entire community had to evacuate, whilst the Great Northern Highway was impassable at times west and north of Halls Creek, isolating the town. In the 24 hour period to 9am on 14 March 2011, Yulmbu, Warmun and Sophie Downs in the east Kimberley broke their highest daily rainfall record for March, and indeed any calendar month. Durack Range observed 636.8 mm in the seven day period from 8 to 14 March 2011, of which 563.4 mm fell over two days (212.4 mm in the 24 hours to 9am on the 13th followed by 351.0 mm in the 24 hours to 9am on the 14th), which has an Average Return Interval of greater than 1 in 100 years. A number of sites in the region broke their highest March rainfall records, with Warmun, Yulmbu and Gibb River observing their highest monthly rainfall total for any month.

In contrast to the heavy rainfall in the north, numerous sites in the Lower Southwest experienced one of their driest March's on record, registering zero or a negligible amount (less than 1 mm) of rainfall for March.

Maximum temperature

Monthly mean maximum temperatures were below to very much below average over much of WA, with an area 5 °C to 6 °C below normal in the Interior and Eucla districts, largely due to an active monsoon causing rain and cloudy conditions for much of the month. A few sites in the Kimberley, and Wiluna in the Goldfields, experienced their lowest March mean maximum temperatures on record. In contrast, the west coast of WA and adjacent inland parts saw above to very much above average daytime temperatures, with mean maxima up to 4 °C above normal near Shark Bay, and along the west coast from Perth to Augusta (see March maximum temperature decile & anomaly maps). Several sites in the Central West, Lower West and Southwest recorded their hottest March on record, including the Perth Metro site.

When averaged across the state, March 2011 was the fifth lowest March mean maximum temperature for WA since comparable records commenced in 1950, however the Lower Southwest recorded the third hottest March on record .

Minimum temperature

Mean minimum temperatures were above to very much above average over much of the SWLD and west Gascoyne during March 2011, with mean minima up to 3 °C above normal in coast parts between Shark Bay and Perth. Record high mean minima for March were recorded at sites in the Central West, Central Wheat Belt, and Great Southern. In contrast, most of the Interior, as well as neighbouring areas of the Kimberley, Pilbara and Gascoyne saw below to very much below average mean minimum temperatures, with mean minima up to 3 °C below normal in the Interior (see March minimum temperature decile & anomaly maps).

When averaged across the state, the mean minimum temperature for WA for March 2011 was near average, however for the Lower Southwest it was the fourth warmest March since comparable records began in 1950.

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Extremes in March 2011
Hottest day 41.1 °C at Roebourne on the 19th
Warmest days on average 37.9 °C at Emu Creek Station
Coolest days on average 22.3 °C at Red Rocks Point
Coldest day 18.0 °C at Wiluna on the 2nd
Coldest night 3.9 °C at Jarrahwood on the 13th
Coolest nights on average 12.9 °C at Jarrahwood
Warmest nights on average

27.7 °C at Bedout Island
27.7 °C at Varanus Island

25.3 °C at Karratha Aero (mainland)

Warmest night 30.0 °C at Bedout Island on the 14th
29.5 °C at Denham (mainland) on the 1st
Wettest overall 841.8 mm at Yulmbu
Wettest day 351.0 mm at Durack Range on the 14th
Highest wind gust 94 km/h at Mount Magnet Aero on the 18th

Record highest March daily rainfall
Highest daily rainfall
in March 2011 (mm)
Previous highest
for March
Years of
record
Warmun 181.1 on the 14th 155.0 on the 30th in 2007 84
Halls Creek Airport 132.8 on the 14th 120.0 on the 7th in 1996 68
Eyre 81.2 on the 17th 75.8 on the 17th in 2000 61
Yulmbu 141.0 on the 8th 86.4 on the 17th in 1960 43
Sophie Downs 160.0 on the 14th 126.4 on the 2nd in 1982 30



Record highest total March rainfall
Total rainfall
for March 2011 (mm)
Previous highest
for March
Years of
record
Average for
March
Warmun 694.7 453.4 in 2007 103 121.5
Gibb River 754.0 418.8 in 1989 83 130.5
Ruby Plains 323.6 219.3 in 2001 69 57.7
Mount Amhurst 448.8 285.8 in 2007 55 70.4
Yulmbu 841.8 255.1 in 1989 44 92.6




Record lowest total March rainfall
Total rainfall
for March 2011 (mm)
Previous lowest
for March
Years of
record
Average for
March
Pearce RAAF 0.2 0.3 in 1973 56 14.5
Karnet 0.4 0.9 in 1973 48 23.9




Record highest March mean daily maximum temperature
Mean daily maximum
temperature
for March 2011 (°C)
Previous highest
for March
Years of
record
Average for
March
Perth Metro* 31.9 31.8 in 1978 114 29.5
Cape Leeuwin 25.4 24.8 in 1983 114 22.7
Bridgetown Comparison 30.6 30.3 in 1978 110 27.2
Cape Naturaliste 27.9 27.4 in 2003 107 24.4
Donnybrook 31.3 31.2 in 1978 107 27.9
Dwellingup 30.6 29.6 in 1995 73 26.9
Pemberton 27.8 27.6 in 1948 67 24.4
Perth Airport 32.8 32.0 in 1978 66 29.7
Karnet 30.9 30.7 in 1995 45 27.8
Jurien Bay 32.5 32.0 in 1983 41 29.3




Record lowest March mean daily maximum temperature
Mean daily maximum
temperature
for March 2011 (°C)
Previous lowest
for March
Years of
record
Average for
March
Wiluna 29.2 29.8 in 1995 106 34.1
Halls Creek Airport 30.7 31.8 in 2001 65 35.5
Warmun 32.3 33.1 in 1974 48 35.9
Troughton Island 30.4 30.5 in 1965 32 32.0



Record highest March mean daily minimum temperature
Mean daily minimum
temperature
for March 2011 (°C)
Previous highest
for March
Years of
record
Average for
March
Rottnest Island 20.8 20.6 in 1978 120 18.0
Dalwallinu Comparison 18.7 18.6 in 1974 54 16.7
Kalbarri 21.9 21.1 in 1974 37 19.0
Hyden 17.2 17.0 in 2005 36 14.1



Summary statistics for March 2011
Maximum temperatures
for March
(°C)
Minimum temperatures
for March
(°C)
Rainfall
for March
(millimetres)
Mean for
March
2011
Diff
from
average
Highest for
March
2011
Mean for
March
2011
Diff
from
average
Lowest for
March
2011
Total for
March
2011
Average
for
March
Rank of
March
2011
Fraction of
March
average
North Kimberley (district 01)
Doongan 30.3 -2.9 35.5 26th 22.3 +0.5 19.6 27th 345.0 187.0 high 184%
Kalumburu 31.3 -2.4 35.3 30th 23.8 +0.3 21.6 28th 144.2 237.3 average 61%
Troughton Island 30.4 -1.6 31.9 31st 25.9 -0.6 23.8 13th 243.8 131.0 high 186%
Truscott 30.6   33.9 30th 24.8   22.9 5th 23.2
Wyndham 33.0 -3.1 35.7 30th 25.1 -0.4 23.4 13th 317.2 159.2 high 199%
Wyndham Aero 32.9 -2.9 35.8 30th 25.3 -0.2 23.7 13th 292.0 154.5 high 189%
East Kimberley (district 02)
Argyle Aerodrome 32.2 -3.2 35.0 30th 23.9 -0.7 21.2 25th
Halls Creek Airport 30.7 -4.8 34.6 3rd 22.4 -0.4 20.0 27th 367.4 80.5 v high 456%
Kununurra Aero 32.2 -3.5 34.9 30th 24.4 +0.2 22.6 10th 320.2 149.6 high 214%
Warmun 32.3 -3.6 35.2 20th 23.7 +0.5 21.0 25th 694.7 121.5 highest 572%
West Kimberley (district 03)
Bidyadanga 33.6 -1.8 38.0 13th 24.3 -0.6 18.8 27th 141.9 96.2 high 148%
Broome Airport 32.8 -1.2 36.4 30th 25.5 +0.1 22.1 16th 84.6 100.8 average 84%
Curtin Aero 33.6 -2.6 37.6 30th 24.4 +0.2 22.6 12th 110.4 156.4 average 71%
Cygnet Bay 32.1 -1.7 34.2 30th 24.8 +0.3 19.5 3rd 91.9 169.5 average 54%
Derby Aero 32.9 -2.4 36.3 30th 25.1 +0.1 22.5 14th 86.8 132.6 average 65%
Fitzroy Crossing Aero 34.0 -2.7 37.2 30th 24.1 +0.2 21.1 29th 129.4 118.5 high 109%
West Roebuck 33.9   37.4 12th 24.4   20.9 27th 109.4 162.7 average 67%
De Grey (district 04)
Bedout Island 32.9   36.0 13th 27.7   25.0 18th
Karratha Aero 35.0 -1.1 38.7 19th 25.3 -0.5 18.8 28th        
Legendre Island 33.8   37.4 19th 27.2   24.0 28th
Mandora 34.7 -2.3 40.8 12th 24.0 +0.1 20.3 28th 122.8 74.3 high 165%
Pardoo Station 35.0 -1.3 41.0 13th     19.0 20th 114.5 64.0 high 179%
Port Hedland Airport 34.9 -1.9 39.3 13th 24.5 0.0 19.6 11th 22.6 48.3 average 47%
Roebourne 37.0 -0.6 41.1 19th 24.0 -1.3 18.1 28th 6.0 64.4 average 9%
Roebourne Aero 35.7   39.3 19th 24.6   18.1 28th 13.6 41.6 average 33%
Fortescue (district 05)
Barrow Island Airport 33.1 -0.2 35.5 13th 26.9 +0.4 23.0 28th 0 62.7 v low 0%
Learmonth Airport 35.7 -0.7 38.3 17th 22.7 -0.2 18.3 26th 0 39.6 lowest 0%
Mardie 36.2 -1.4 39.7 13th 24.5 +0.4 20.0 28th 9.0 50.4 average 18%
Onslow 35.6 +0.2 40.0 6th 24.8 +1.5 21.3 29th 51.6 49.2 high 105%
Onslow Airport 35.3 -0.8 38.4 13th 24.4 +0.4 21.3 28th 68.8 74.7 high 92%
Wittenoom 34.0 -2.7 36.5 20th 22.8 -1.5 18.3 28th 52.6 70.4 average 75%
West Gascoyne (district 06)
Carnarvon Airport 33.8 +2.3 38.1 15th 23.3 +1.3 17.9 28th 23.0 15.9 high 145%
Denham 33.7 +2.8 39.0 1st 24.5 +2.7 21.2 28th 0 14.4 lowest 0%
Emu Creek Station 37.9 -0.6 40.5 13th 23.9 +0.1 18.6 28th 2.6 39.9 low 7%
Gascoyne Junction 36.5 -1.0 39.5 9th 23.6 +1.1 18.2 28th 1.4 29.1 low 5%
Murchison 35.2 0.0 38.9 9th 21.7 +1.8 14.4 28th 3.8 34.0 low 11%
Shark Bay Airport 34.4 +0.4 37.8 14th 22.3 +1.3 17.9 28th 0 15.2 v low 0%
East Gascoyne (district 07)
Newman Aero 32.4 -2.6 36.1 6th 20.3 -1.2 13.7 27th 26.0 40.3 average 65%
Paraburdoo Aero 35.8 -0.8 38.6 18th 23.3 +0.1 17.0 28th 22.6 45.6 average 50%
Murchison (district 07A)
Meekatharra Airport 31.2 -3.1 36.0 19th 19.8 -1.6 16.2 25th 28.8 28.2 high 102%
Mount Magnet Aero 32.3 -0.7 35.4 10th 20.6 +0.5 16.6 29th 6.2 35.0 average 18%
North Coast (district 08)
Carnamah 34.3 +1.6 38.5 10th 19.5 +2.2 12.5 11th 23.4 20.3 high 115%
Dalwallinu 32.6 +1.0 37.5 10th 17.7 +1.4 13.5 31st 8.4 23.9 average 35%
Dalwallinu Comparison 33.1 +1.5 36.9 10th 18.7 +2.0 15.0 31st 9.0 24.1 average 37%
Eneabba                 1.0 13.2 average 8%
Geraldton Airport 34.1 +3.2 40.6 1st 19.7 +1.8 15.4 29th 3.4 15.8 average 22%
Kalbarri 35.3 +2.8 40.6 1st 21.9 +2.9 18.3 29th 0.4 11.9 average 3%
Morawa Airport 34.7 +1.6 38.5 10th 19.3 +1.5 14.9 28th 8.4 15.7 average 54%
Mullewa 34.7 +1.0 37.6 10th 20.8 +2.5 17.5 20th 0.5 18.8 low 3%
North Island 31.0 +3.2 35.1 1st 24.5 +2.9 21.6 12th 0.2 2.5 average 8%
Wongan Hills 33.0 +2.1 38.2 10th 18.0 +1.7 15.1 13th 11.8 20.3 average 58%
Central Coast (district 09)
Badgingarra Research Stn 33.5 +1.5 36.1 15th 18.6 +2.3 13.7 6th 1.8 16.1 low 11%
Bickley 30.4 +2.4 34.2 25th 16.2 +1.8 12.6 13th 4.2 24.7 low 17%
Champion Lakes 31.6   35.1 25th 19.6   16.5 13th 19.4
Garden Island HSF 28.8   36.2 1st 20.0   16.7 13th 0 13.5 v low 0%
Gingin Aero 32.8 +2.1 36.0 25th 17.4 +2.3 9.8 28th 0.6 14.7 v low 4%
Jandakot Aero 32.5 +3.0 36.1 25th 17.9 +2.7 12.9 11th 0 15.3 lowest 0%
Jurien Bay 32.5 +3.2 39.5 15th 18.9 +2.4 14.5 28th 0.8 13.6 low 6%
Karnet 30.9 +3.1 36.0 1st 16.2 +2.1 12.0 11th 0.4 23.9 lowest 2%
Lancelin 31.9 +3.5 38.5 15th 18.5 +1.8 15.3 8th 0 14.1 lowest 0%
Medina Research Centre 31.8 +2.6 36.4 4th     13.4 28th 0.2 19.0 v low 1%
Pearce RAAF 33.2 +2.7 37.0 4th 18.3 +2.4 11.4 28th 0.2 14.5 lowest 1%
Perth Airport 32.8 +3.1 37.0 25th 18.5 +2.6 12.5 28th 0 15.9 lowest 0%
Perth Metro* 31.9 +2.4 36.4 25th 18.6 +2.1 14.1 27th 0 19.5 lowest 0%
Rottnest Island 28.3 +2.3 34.4 1st 20.8 +2.8 17.2 13th 0 16.7 lowest 0%
Swanbourne 31.1 +2.3 37.0 1st 19.1 +1.8 15.8 13th 0 21.1 lowest 0%
South Coast (district 09A)
Albany 23.4 +1.2 31.0 4th 16.4 +1.8 11.4 13th 11.6 38.4 low 30%
Albany Airport 25.1 +1.0 34.5 4th 13.4 0.0 6.9 13th 17.8 33.1 average 54%
Bridgetown 29.1 +1.6 34.6 27th 13.0 +1.4 4.3 13th 1.2 17.8 v low 7%
Bridgetown Comparison 30.6 +3.4 35.5 27th 13.5 +2.7 5.2 13th 1.4 25.9 v low 5%
Bunbury 30.0 +2.4 34.5 1st 15.9 +1.8 11.4 11th 0 15.0 v low 0%
Busselton 29.5 +2.4 33.6 15th 15.4 +1.4 10.3 13th 0.4 11.3 v low 4%
Busselton Aero 30.2 +2.3 33.7 15th 14.7 +1.4 8.8 13th 0 15.8 v low 0%
Cape Leeuwin 25.4 +2.7 29.9 3rd 18.8 +2.1 13.4 13th 2.4 28.2 v low 9%
Cape Naturaliste 27.9 +3.5 32.9 15th 17.2 +2.2 12.4 13th 4.2 22.7 low 19%
Collie East 30.7   34.3 27th 13.6   7.0 13th 0
Donnybrook 31.3 +3.4 35.7 26th 16.2 +3.3 10.5 12th 0 24.5 lowest 0%
Dwellingup 30.6 +3.7 34.1 25th 15.1 +2.2 11.6 7th 0.2 26.2 v low 1%
Esperance 25.1 -0.1 36.0 10th 15.6 +0.5 10.1 14th 33.8 27.0 high 125%
Esperance Aero 25.6 -0.3 35.6 10th 15.0 +0.5 10.6 14th 33.6 31.0 high 108%
Harvey 31.5 +2.3 35.2 25th 16.1 +1.2 10.0 20th 0 11.9 v low 0%
Hopetoun North 25.2 +0.2 38.3 10th 15.1 +0.7 9.2 14th 28.8 28.1 average 102%
Jarrahwood 30.6 +3.1 35.7 25th 12.9 +1.3 3.9 13th 5.6 18.6 low 30%
Mandurah 29.7   35.3 1st 19.8   16.3 13th 0 15.3 v low 0%
Manjimup 28.1 +3.4 34.4 4th 14.0 +1.5 8.7 13th 4.0 30.1 v low 13%
North Walpole 25.4   34.5 4th 15.0   10.9 9th 9.6
Pemberton 27.8 +3.4 34.4 4th 14.5 +1.8 8.2 13th 8.3 37.1 v low 22%
Rocky Gully 27.2 +2.0 34.7 4th 13.4 +1.0 7.6 13th 3.8 36.8 v low 10%
Shannon 26.9 +2.1 34.3 4th 13.4 +1.0 7.0 13th 6.4 32.4 v low 20%
Witchcliffe 28.3 +2.6 34.0 26th 13.6 +0.8 8.0 13th 6.4 21.2 v low 30%
North Central (district 10)
Cunderdin Airfield 32.7 +1.8 39.0 10th 17.1 +1.9 11.9 28th 6.2 15.4 average 40%
Merredin 32.1 +1.8 37.0 10th 17.6 +1.4 14.7 13th 0 20.2 lowest 0%
Northam 33.2 +2.4 39.0 10th 17.0 +1.6 11.6 28th 0.8 18.3 low 4%
York 32.9 +2.3 38.5 10th 15.9 +1.8 10.7 27th 1.4 15.3 low 9%
South Central (district 10A)
Beverley 33.5 +2.8 38.6 10th 16.4 +1.8 11.8 28th 0 16.3 lowest 0%
Brookton 31.6 +2.2 37.8 10th 16.3 +2.0 12.9 20th 3.5 17.8 low 20%
Corrigin 31.1 +2.3 37.5 10th 15.6 +1.3 12.4 28th 1.0 21.2 low 5%
Hyden 31.7 +1.8 39.0 10th 17.2 +3.1 14.0 13th 1.1 19.6 low 6%
Jacup 27.3 +1.7 37.5 10th 13.2 +0.7 6.8 13th 5.2 29.6 v low 18%
Katanning 28.6 +1.3 36.0 10th 13.9 +1.0 8.3 13th 4.6 15.5 average 30%
Katanning Comparison 28.8 +2.0 35.6 10th 14.2 +1.6 10.0 7th 9.4 22.2 average 42%
Lake Grace 29.5 +1.4 37.4 10th 15.2 +0.9 10.8 13th 0.2 16.1 v low 1%
Lake Grace Comparison 29.7 +1.6 37.1 10th 15.2 +1.1 10.7 13th 0 22.2 lowest 0%
Narembeen 32.3 +2.1 37.5 10th 16.5 +1.7 14.0 13th 0.7 20.1 low 3%
Narrogin 29.7 +2.4 36.5 10th 15.3 +2.3 10.4 13th 1.4 20.6 low 7%
Newdegate Research Station 29.6 +1.6 37.9 10th 13.2 +0.6 9.0 27th 1.4 20.6 low 7%
Ongerup 27.7 +1.8 36.8 10th 14.2 +1.0 9.2 13th 5.0 22.0 low 23%
Pingelly 30.8 +2.5 37.0 10th 16.2 +1.6 12.4 20th 1.6 16.9 low 9%
Ravensthorpe 27.2 +0.6 36.1 10th 14.3 +0.7 9.6 3rd 18.8 31.0 average 61%
Wagin 29.9 +2.3 36.5 10th 14.6 +1.2 8.8 13th 0 19.9 lowest 0%
Wandering 31.0 +2.0 37.3 10th 14.1 +1.8 9.3 13th 10.8 13.4 average 81%
Eucla (district 11)
Balgair 24.2 -5.0 29.5 11th     10.5 28th        
Balladonia 27.4 -0.7 35.9 11th 13.8 +0.3 9.5 31st 15.6 26.9 average 58%
Eucla 22.6 -2.6 36.2 6th 15.4 -0.5 9.6 24th 41.8 22.6 high 185%
Eyre 23.7 -2.0 31.6 11th 13.0 -1.3 4.4 29th 114.5 27.3 v high 419%
Forrest 25.0 -4.2 33.0 6th 13.9 -0.5 8.7 28th 46.4 29.9 average 155%
Red Rocks Point 22.3   25.7 11th 16.6   10.1 29th 40.0
South East (district 12)
Bulga Downs 31.4   37.0 18th 18.0   13.7 29th 6.2 23.6 average 26%
Kalgoorlie-Boulder Airport 27.6 -1.9 33.6 11th 16.1 0.0 13.0 14th 29.4 24.2 high 121%
Laverton Aero 27.4 -3.1 32.6 12th 16.9 -1.3 13.4 24th 15.2 36.4 average 42%
Leinster Aero 29.2 -2.7 35.2 12th 18.0 -1.1 14.0 22nd 5.2 27.6 low 19%
Leonora 29.0 -3.7 35.2 11th 17.7 -0.9 13.9 22nd 3.4 28.5 low 12%
Leonora Aero 28.6   34.4 11th 18.2   14.9 22nd 3.0
Munglinup West 26.8   35.3 10th 14.3   11.0 31st 45.0
Norseman 28.7 -0.1 34.5 12th 14.9 +0.4 9.5 14th 21.0 23.9 average 88%
Norseman Aero 28.4 -0.5 35.1 11th 14.5 +0.5 8.3 14th 19.0 25.2 average 75%
Salmon Gums Res.Stn. 27.6 +0.3 34.9 10th 13.2 +0.6 6.4 13th 22.0 24.4 average 90%
Southern Cross Airfield 31.0 +0.3 35.5 10th 16.6 +1.7 12.8 28th 9.8 36.4 average 27%
Yeelirrie 29.4 -4.0 35.2 12th 17.3 -1.0 11.8 26th 15.3 31.4 average 49%
North East (district 13)
Carnegie 29.4 -4.7 34.0 16th 18.6 -1.4 14.5 25th 125.1 33.2 v high 377%
Giles Meteorological Office 29.7 -4.1 35.4 7th 18.5 -2.1 12.2 29th 111.4 36.7 v high 304%
Telfer Aero 33.9 -3.5 37.9 13th 22.8 -1.2 17.0 27th 201.2 79.7 high 252%
Warburton Airfield 28.9 -5.2 34.4 12th 18.3 -1.6 13.5 25th 140.2 31.7 v high 442%
Wiluna 29.2 -4.9 35.5 12th 18.5 -1.1 13.9 28th 48.3 35.2 high 137%

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 Friday 1 April 2011. 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.
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.

Records in this summary are based on sites with at least 30 years of data.

For PDF files of Perth Metro climate statistics for other months, please click here for extremes and here for averages.

Further information

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