Western Australia in January 2012: Cool wet in WA; record warm nights in the southwest

  • Rainfall: Above average for WA.
  • Maximum temperature: 3rd coolest January on record for WA; above average for southwest.
  • Minimum temperature: below average for WA; warmest January on record for southwest.

Rainfall

Rainfall in WA during January 2012 was above to very much above average for much of WA, from the west Kimberley, Pilbara, Interior, to adjacent parts of the Gascoyne and Goldfields. A number of sites in the west Kimberley, Pilbara, and northern Gascoyne registered their wettest January on record as a result of an active monsoon during the month, along with the passage of Tropical Cyclone Heidi across the Pilbara coast near Port Hedland, and influence of TC Iggy though it remained off the WA coast. Above to very much above average rainfall was also observed in parts of Southwest Land Division (SWLD), mainly in the west. In contrast, below to very much below average rainfall was confined to parts of the east Kimberley as the most significant monsoonal activity remained to the west.

When averaged across the state, January 2012 rainfall was very much above average, whilst the SWLD and the Lower Southwest (southwest a line from Jurien Bay to Bremer Bay) saw above average rainfall.

Tropical Cyclone Heidi made landfall near Port Hedland on the 12th and generally moved in a southerly direction after landfall, bringing very heavy falls to the east Pilbara and west Kimberley, and unconfirmed reports of totals over 300 mm near the TC path. Wallareenya and Wittenoom in the Pilbara, and Mount Vernon in the north Gascoyne recorded January daily rainfall records on the 12th, 13th, and 14th respectively.

A surface trough near the west coast produced slow moving thunderstorms in western parts of WA on the 20th, particularly in the Perth Metropolitan area. Several sites in the Perth hills broke their daily rainfall record for January in more than 100 years of record, whilst Serpentine broke both its daily and monthly record for January with a single daily fall of 60.6 mm.

A very active monsoon over northern WA in association with Tropical Cyclone Iggy northwest of the Pilbara coast brought a very wet spell to parts of the Pilbara and Kimberley between the 26th and 29th. Cygnet Bay and Cape Leveque in the west Kimberley both recorded 4 consecutive days of rainfall over 100 mm. Such a sequence of four consecutive days over 100 mm had not been recorded before in WA. The daily falls of 206.8 mm at Cygnet Bay on the 26th and 239.6 mm at Cape Leveque on the 27th were their highest daily totals for January on record.

Maximum temperature

Below to very much below average mean maximum temperatures were observed across much of WA with up to 5 °C cooler than normal maxima in the southeast Pilbara, east Gascoyne, northern Goldfields, and western Interior. Leonora in the Goldfields experienced its coolest January in 61 years of record with a mean maximum temperature of 32.0 °C. Only in west coast parts of WA were mean maximum temperatures above to very much above average, with up to 4 °C warmer than normal maxima in the Shark Bay region. A few sites in the Lower West and Southwest districts experienced their hottest January on record. The mean maximum temperature of 29.5 °C at Cape Naturaliste was a new record in 108 years of temperature recording, and 1.0 °C warmer than its previous record set in January 1962.

When averaged over the state, January 2012 was the 3rd coolest January on record since comparable records commenced in 1950, however, the Lower Southwest recorded an above average January.

A number of hot spells were experienced in western parts of WA during January, including events in the Perth metropolitan area in the middle and latter part of month. The most notable hot spell was in the latter part of the month when many sites registered four or more consecutive days with daily maxima over 35 °C. Jurien Bay in the Central West experienced eight consecutive days with daily maxima over 35 °C, which equaled its longest hot spell on record, with January 1976 (20th-27th) and February 1995 (16th-23rd).

Minimum temperature

Mean minimum temperatures was above to very much above average in western and southern parts of WA, with up to 3 °C warmer than normal minima along the west coast from Shark Bay to Cape Leeuwin. Many sites in Lower West, Southwest, and Great Southern experienced their warmest January on record including a number with over 100 years of record.

Conversely, below to very much below average minima were observed in the west Kimberley, east Pilbara, east Gascoyne, and adjacent northern Goldfields and Interior, with up to 4 °C cooler than normal minima in the east Gascoyne.

When averaged across the state, the mean minimum temperature for WA was below average. In contrast, the Lower Southwest recorded its hottest January nights since comparable record commenced in 1950 .

Without the cooling effect of sea breezes, the warmest nights of the month for most western parts of WA coincided with the hottest days, between the 26th and 27th. Jurien Bay in the Central West broke its January minimum record on the 26th, whilst Cape Leeuwin in the Southwest recorded two consecutive days of minima over 23 °C (23.5 °C on the 26th & 23.1 °C on the 27th), which had previously never occurred in 106 years of daily records.

Other Phenomena

Tropical Cyclone Heidi formed north of the Pilbara coast on the evening on the 10th moving southward. Heidi approached Port Hedland on the 11th and crossed the Pilbara coast as a category 2 system on the morning of the 12th approximately 15 km east of Port Hedland. After landfall, Heidi moved on a south-southwest track and weakened into a tropical low over the southern Pilbara. Heidi produced sustained winds of 119 km/h and a maximum gust of 144 km/h to Bedout Island on the 11th, whilst Port Hedland Airport recorded maximum winds of 98 km/h and gusts to 131 km/h early on the 12th. Damage was mainly confined to uprooted trees and minor flooding, with large scale power outages in South Hedland and Wedgefield. The decaying TC and low brought very heavy rainfall to various locations in the Pilbara and western Kimberley, with unconfirmed reports over 300 mm, and associated flooding.

Tropical Cyclone Iggy formed 850 km northwest of Exmouth, off the west Pilbara coast, on the morning of the 26th. Iggy firstly moved southeasterly then changed to a west-southwest track on the 30 and 31 January. Iggy remained offshore and had no significant impact on the WA coast, although the associated monsoonal burst brought heavy rainfall to parts of the west Kimberley and Pilbara coast.

Further information

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Extremes in January 2012
Hottest day 44.9 °C at Eneabba on the 29th
Warmest days on average 39.1 °C at Gascoyne Junction
Coolest days on average 23.8 °C at Albany
Coldest day 17.7 °C at Shannon on the 1st
Coldest night 5.7 °C at Jarrahwood on the 17th
Coolest nights on average 14.1 °C at Rocky Gully
Warmest nights on average 26.7 °C at Troughton Island
26.5 °C at Wyndham
Warmest night 30.3 °C at Wyndham on the 2nd
Warmest on average overall 31.8 °C at Wyndham Aero
Coolest on average overall 20.4 °C at Albany
Wettest overall 978.2 mm at Cape Leveque
Wettest day 239.8 mm at Cape Leveque on the 27th
Highest wind gust 144 km/h at Bedout Island on the 11th

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 January daily rainfall
Highest daily rainfall
in January 2012 (mm)
Previous wettest
for January
Years of
record
Chidlow 86.4 on the 20th 64.3 on the 21st in 1957 105
Jarrahdale 60.6 on the 20th 58.2 on the 21st in 1982 105
Mundaring 68.8 on the 20th 36.8 on the 20th in 1923 104
Cape Leveque 239.8 on the 27th 209.3 on the 23rd in 1963 87
Serpentine 60.6 on the 20th 27.9 on the 1st in 1960 86
Wallareenya 132.0 on the 12th 119.1 on the 21st in 1973 78
Mount Vernon 117.2 on the 14th 90.7 on the 25th in 1961 72
Wittenoom 170.8 on the 13th 170.4 on the 8th in 1997 57
Cygnet Bay 206.8 on the 26th 186.0 on the 17th in 1974 49



Record highest total January rainfall
Total rainfall
for January 2012 (mm)
Previous wettest
for January
Years of
record
Average for
January
Serpentine 60.6 44.9 in 1960 89 9.6
Cape Leveque 978.2 787.8 in 1974 85 222.7
Wallareenya 292.4 291.4 in 1997 83 67.7
Mount Vernon 249.2 171.2 in 1990 73 36.2
Wittenoom 469.8 358.4 in 1997 62 108.6
Cygnet Bay 907.3 757.2 in 1997 49 242.2
Tangadee 268.6 184.0 in 2011 49 47.0



Record highest January mean daily maximum temperature
Mean daily maximum
temperature
for January 2012 (°C)
Previous warmest
for January
Years of
record
Average for
January
Cape Naturaliste 29.5 28.5 in 1962 108 25.3
Pemberton 28.9 28.7 in 1962 67 26.1
Lancelin 33.3 32.7 in 1978 45 29.0



Record lowest January mean daily maximum temperature
Mean daily maximum
temperature
for January 2012 (°C)
Previous coolest
for January
Years of
record
Average for
January
Leonora 32.0 32.3 in 2000 61 37.1




Record highest January daily minimum temperature
Highest daily minimum
temperature
in January 2012 (°C)
Previous warmest
for January
Years of
record
Average for
January
Cape Leeuwin 23.5 on the 26th 22.7 on the 23rd in 1989 106 16.9
Jurien Bay 27.0 on the 26th 26.5 on the 9th in 1984 42 17.1



Record highest January mean daily minimum temperature
Mean daily minimum
temperature
for January 2012 (°C)
Previous warmest
for January
Years of
record
Average for
January
Cape Leeuwin 19.1 18.4 in 1956 115 16.9
Bridgetown Comparison 15.4 15.2 in 1961 111 12.2
Cape Naturaliste 18.1 17.3 in 1920 108 15.2
Donnybrook 17.4 16.6 in 1915 107 13.9
Narrogin 16.6 16.2 in 2001 87 14.1
Manjimup 15.0 14.7 in 1956 72 13.0
Pemberton 15.7 15.2 in 1956 67 13.1
Perth Airport 19.7 19.5 in 1962 67 17.0
Lake Grace Comparison 16.7 16.6 in 1997 54 15.0
Pearce RAAF 20.0 19.8 in 1989 50 16.9
Albany Airport Comparison 15.2 15.1 in 1974 46 13.7
Lancelin 19.8 19.2 in 2011 45 17.5
Badgingarra Research Stn 19.4 19.0 in 2011 43 17.0
Brookton 17.8 17.1 in 2001 43 15.4
Beverley 18.6 18.2 in 1978 41 16.2
Pingelly 17.5 17.1 in 1978 39 15.4
Wagin 16.1 15.9 in 2001 38 14.5


Summary statistics for January 2012
Maximum temperatures
for January
(°C)
Minimum temperatures
for January
(°C)
Rainfall
for January
(millimetres)
Mean for
January
2012
Diff
from
average
Highest for
January
2012
Mean for
January
2012
Diff
from
average
Lowest for
January
2012
Total for
January
2012
Average
for
January
Rank of
January
2012
Fraction of
January
average
North Kimberley (district 01)
Doongan 32.6 -0.7 35.5 16th 22.5 -0.3 20.8 21st 378.1 306.3 high 123%
Kalumburu 33.7 -0.1 37.6 15th 24.1 -0.5 23.0 30th 328.2 305.2 average 108%
Mount Elizabeth 32.3 -0.8 37.1 14th 21.8 -0.2 19.7 21st 241.7 256.9 average 94%
Troughton Island 32.2 +0.4 34.5 18th 26.7 +0.4 21.8 24th 267.8 273.0 average 98%
Truscott 32.6   35.0 18th 25.1   21.7 24th 279.8
Wyndham 36.8 -0.1 41.2 18th 26.5 +0.1 22.8 21st 150.0 186.0 average 81%
Wyndham Aero 37.3 +1.0 42.3 17th 26.3 +0.1 22.5 21st 88.2 191.9 low 46%
East Kimberley (district 02)
Argyle Aerodrome 37.0 +0.6 41.5 15th 25.9 +0.3 21.8 11th 78.2 153.2 low 51%
Halls Creek Airport 36.1 -0.7 39.8 15th 24.1 -0.2 21.1 28th 90.6 151.3 low 60%
Kununurra Aero 36.5 +0.7 42.2 13th 24.8 -0.3 21.6 21st        
Warmun 36.6 -0.7 41.0 15th 25.0 +0.2 22.0 21st 119.0 179.3 average 66%
West Kimberley (district 03)
Bidyadanga 33.5 -0.9 38.7 23rd 25.4 -0.6 22.0 26th 327.5 127.1 v high 258%
Broome Airport 33.2 -0.1 37.8 5th 25.9 -0.4 22.6 25th 239.8 179.4 high 134%
Curtin Aero 35.2 -1.3 39.4 20th 24.6 -0.4 22.1 16th 266.0 218.7 average 122%
Derby Aero 34.1 -1.1 38.2 3rd 25.2 -0.5 22.3 24th 380.8 199.5 v high 191%
Fitzroy Crossing Aero 36.3 -1.4 41.3 20th 24.1 -1.1 21.6 27th 240.2 169.0 high 142%
West Roebuck 34.4 +0.3 38.5 5th 24.8 -0.5 22.4 25th 272.0 209.9 high 131%
De Grey (district 04)
Bedout Island 32.2   35.0 20th 26.5   23.0 14th
Karratha Aero 34.5 -1.5 39.4 21st 26.0 -0.8 23.3 3rd 152.6 47.5 v high 321%
Legendre Island 32.4   35.0 22nd 26.4   24.2 10th
Mandora 33.5 -2.5 39.2 4th 24.8 -0.6 22.0 5th 270.3 82.9 v high 326%
Marble Bar 36.4 -5.1 42.2 4th 24.8 -2.1 21.9 10th 181.2 67.3 v high 269%
Pardoo Station 33.9 -2.6 39.2 20th 25.4 -0.5 21.4 1st 290.9 62.0 v high 469%
Port Hedland Airport 34.0 -2.4 39.0 23rd 25.2 -0.3 22.6 10th 261.8 62.3 v high 420%
Roebourne 36.2 -2.5 41.7 4th 25.5 -0.7 21.0 28th 172.4 60.8 high 284%
Roebourne Aero 36.0 -3.2 42.0 4th 25.4 -1.0 21.2 3rd 210.8 72.0 high 293%
Fortescue (district 05)
Barrow Island Airport 32.6 -0.6 37.7 22nd 26.1 +0.3 23.3 8th 113.0 24.4 v high 463%
Learmonth Airport 35.9 -2.1 41.4 22nd 24.0 +1.1 19.6 4th 87.8 31.8 v high 276%
Mardie 35.6 -2.4 41.2 22nd 25.4 +0.4 20.8 3rd 93.4 37.9 high 246%
Onslow 34.4 -1.3 38.5 25th 25.4 +1.7 20.4 1st 69.9 28.3 high 247%
Onslow Airport 35.0 -1.4 39.6 23rd 24.9 +0.6 20.6 1st 66.8 40.7 high 164%
Wittenoom 35.2 -4.5 42.0 4th 23.5 -2.6 20.0 10th 469.8 108.6 highest 433%
West Gascoyne (district 06)
Carnarvon Airport 34.3 +3.1 43.7 28th 24.2 +1.7 20.5 7th 22.0 12.1 high 182%
Denham 33.3 +2.9 43.0 24th 24.7 +2.8 20.0 8th 3.8 7.6 high 50%
Emu Creek Station 37.8 -3.5 40.3 8th 24.7 +0.3 20.5 2nd 174.4 46.8 v high 373%
Gascoyne Junction 39.1 -1.7 43.7 29th     19.2 2nd 41.4 24.1 high 172%
Murchison 38.1 -1.3 43.2 29th 23.3 +1.2 17.8 1st 30.4 20.2 high 150%
Shark Bay Airport 36.2 +2.8 44.8 24th 23.1 +1.8 17.9 1st 5.2 8.8 average 59%
East Gascoyne (district 07)
Newman Aero 34.7 -4.8 41.3 3rd 23.2 -1.8 18.8 10th 238.4 62.2 v high 383%
Paraburdoo Aero 37.1 -4.0 42.9 4th 23.9 -2.1 19.8 9th 205.2 52.0 v high 395%
Murchison (district 07A)
Meekatharra Airport 34.4 -3.9 40.6 29th 22.3 -2.1 16.5 8th 103.4 28.2 v high 367%
Mount Magnet Aero 35.5 -2.5 41.9 29th 23.0 -0.4 17.9 7th 24.0 25.7 average 93%
North Coast (district 08)
Dalwallinu 34.8 -0.5 41.4 28th 19.2 +1.3 13.6 8th 56.2 24.0 high 234%
Dalwallinu Comparison 34.7 -0.5 41.3 28th 19.9 +1.6 13.9 8th 58.0 15.2 v high 382%
Geraldton Airport 34.7   43.7 25th 21.7   14.2 8th 4.0
Kalbarri 35.4 +2.3 44.8 27th 22.6 +3.2 14.5 7th 1.4 4.3 average 33%
Morawa Airport 37.4 +0.2 42.7 28th 21.4 +1.8 14.4 8th 14.0 24.3 average 58%
Mullewa 37.6 +0.8 42.7 28th 22.0 +2.6 14.9 8th 0.9 13.0 average 7%
North Island 30.1 +3.1 35.0 26th 23.0 +2.0 20.2 8th 2.0 2.5 high 80%
Wongan Hills 34.7 +0.2 41.5 28th 19.2 +1.5 12.8 8th 12.2 13.7 average 89%
Central Coast (district 09)
Badgingarra Research Stn 35.0 +0.3 41.1 28th 19.4 +2.4 11.8 7th 23.6 9.2 high 257%
Bickley 30.5 -0.1 38.0 26th 16.9 +1.7 10.6 8th 52.8 18.1 v high 292%
Champion Lakes 32.6   40.6 28th 20.3   12.1 8th 21.6
Garden Island HSF 30.5 +3.5 40.2 25th 20.4 +1.7 15.0 8th 24.6 11.6 high 212%
Gingin Aero 34.3 +1.3 41.3 28th 19.3 +3.1 10.4 8th 16.0 16.0 average 100%
Gooseberry Hill 32.2 -0.4 41.8 28th 18.5 +1.4 12.1 8th
Gosnells City 34.1 +1.0 42.5 28th 20.6 +2.2 11.0 8th 14.8 12.0 high 123%
Jandakot Aero 33.5 +2.3 41.5 26th 19.4 +2.8 9.8 8th 12.8 14.6 high 88%
Jurien Bay                 2.8 6.9 average 41%
Karnet 30.7 0.0 39.0 28th 16.9 +1.7 8.1 8th 31.0 17.3 high 179%
Lancelin 33.3 +4.3 42.7 25th 19.8 +2.3 12.0 8th 3.0 8.8 average 34%
Medina Research Centre 33.2 +2.7 41.8 26th 19.8 +3.0 10.6 8th 35.2 12.2 high 289%
Pearce RAAF 34.0 +0.5 41.3 26th 20.0 +3.1 10.9 8th        
Perth Airport 33.4 +1.7 41.5 26th 19.7 +2.7 11.9 8th 27.2 9.7 v high 280%
Perth Metro 33.5 +2.6 42.1 28th 20.1 +2.2 13.5 8th 18.8 9.6 high 196%
Rottnest Island 29.7 +3.4 39.5 25th 20.8 +1.8 16.1 8th 1.0 7.8 average 13%
Swanbourne 33.1 +3.6 43.1 26th 20.4 +2.4 13.1 8th 1.8 16.1 average 11%
South Coast (district 09A)
Albany 23.8 +1.0 31.4 21st 17.1 +2.0 11.4 17th 11.8 23.9 average 49%
Albany Airport Comparison 26.2 +1.5 37.0 21st 15.2 +1.5 8.0 17th 8.4 23.7 low 35%
Bridgetown 31.0 +1.3 40.2 27th 15.0 +2.1 6.2 17th 19.0 16.3 average 117%
Bridgetown Comparison 31.3 +1.5 40.4 27th 15.4 +3.2 7.5 17th 26.4 14.5 high 182%
Bunbury 31.7 +2.1 40.4 25th 18.1 +2.9 8.9 8th 1.8 12.3 average 15%
Busselton Aero 31.6 +1.6 40.2 26th 16.5 +2.4 7.6 17th 1.2 12.6 average 9%
Cape Leeuwin 25.1 +2.1 32.1 27th 19.1 +2.2 14.8 17th 2.0 16.4 v low 12%
Cape Naturaliste 29.5 +4.2 37.5 26th 18.1 +2.9 12.3 17th 0.6 10.7 v low 6%
Collie East 31.3   39.4 28th 15.2   8.6 17th 15.6 17.6 average 89%
Donnybrook 32.1 +1.6 40.5 27th 17.4 +3.5 10.6 17th 1.6 12.2 low 13%
Dwellingup 31.8 +2.2 39.7 26th 16.6 +2.4 8.3 8th 2.4 15.6 low 15%
Esperance 26.1 0.0 36.1 15th 16.6 +1.0 12.2 18th 30.4 27.7 high 110%
Esperance Aero 27.2 -0.4 38.1 22nd 15.6 +0.8 11.7 18th 48.6 27.8 high 175%
Harvey 32.9 +2.0 40.0 26th         16.4 13.2 average 124%
Hopetoun North 25.9 +0.5 36.5 21st 16.0 +0.8 9.9 31st 24.8 45.0 average 55%
Jarrahwood 31.6 +2.2 40.7 26th 15.8 +3.3 5.7 17th 8.4 14.2 average 59%
Mandurah 31.8 +2.8 41.1 25th 20.6 +2.0 13.7 8th 67.8 18.6 high 365%
Manjimup 29.4 +2.3 39.6 27th 15.0 +2.0 9.2 17th 11.8 19.6 average 60%
North Walpole 26.5   35.5 25th 15.7   9.5 17th 13.6
Pemberton 28.9 +2.8 39.3 26th 15.7 +2.6 9.3 17th 16.9 22.0 average 77%
Rocky Gully 28.6 +1.4 40.5 27th 14.1 +1.6 5.8 17th 18.0 17.5 high 103%
Windy Harbour 25.5 +2.5 34.4 25th         5.1 16.4 low 31%
Witchcliffe 29.7 +3.7 40.6 26th 15.7 +1.9 8.2 17th 5.8 11.4 average 51%
North Central (district 10)
Bencubbin 33.6 -0.9 40.2 29th 19.0 +0.9 13.5 8th 25.2 16.3 high 155%
Cunderdin Airfield 34.8 +0.1 43.1 28th 18.6 +1.5 11.6 8th 5.2 23.8 average 22%
Merredin 33.6 -0.2 42.1 28th 18.7 +1.0 11.7 8th 18.6 14.3 high 130%
Northam 34.6 +0.4 41.4 28th 18.7 +1.6 10.3 8th 1.0 10.3 average 10%
York 34.3 +0.2 42.3 28th 17.8 +1.6 10.5 8th 17.8 29.9 average 60%
South Central (district 10A)
Beverley 34.5 +0.3 41.2 26th 18.6 +2.4 10.8 8th 2.4 11.9 average 20%
Brookton 33.1 +0.2 40.5 28th 17.8 +2.4 8.2 8th 3.0 12.6 average 24%
Corrigin 32.3 -0.2 40.3 28th 17.5 +1.7 8.8 8th 4.8 16.3 average 29%
Hyden 33.1 -0.5 42.0 28th 17.0 +1.6 9.5 8th 6.3 19.1 average 33%
Jacup 28.8 +1.4 42.4 28th                
Katanning 30.1 +0.4 40.1 27th 15.0 +1.5 9.0 17th 67.0 27.8 high 241%
Katanning Comparison 30.0 -0.2 39.5 28th 15.2 +1.6 9.4 17th 77.0 14.7 v high 524%
Lake Grace 30.8 -0.1 40.4 28th 16.7 +1.6 11.0 9th 32.2 42.8 high 75%
Lake Grace Comparison 30.8 -0.7 41.0 28th 16.7 +1.7 10.9 9th 33.6 18.5 high 182%
Narembeen 33.8 -0.2 42.0 28th         32.1 16.2 high 198%
Narrogin 31.2 +0.2 39.9 28th 16.6 +2.5 11.2 8th 17.6 12.8 high 138%
Newdegate Research Station 30.8 0.0 41.3 28th 14.6 +0.8 7.6 9th 6.6 19.0 average 35%
Ongerup 28.9 +0.4 40.7 28th 15.2 +1.4 8.7 17th 19.6 18.8 high 104%
Pingelly 31.9 +0.1 39.5 28th 17.5 +2.1 9.7 8th 24.6 11.0 v high 224%
Ravensthorpe 28.6 -0.3 41.0 28th 15.2 +1.2 9.7 31st 10.8 24.9 average 43%
Wagin 31.1 +0.1 39.7 27th 16.1 +1.6 9.8 8th 3.9 12.6 average 31%
Wandering 32.0 0.0 39.7 28th 16.5 +2.6 8.5 8th 30.6 18.6 high 165%
Eucla (district 11)
Balladonia 30.4 -0.9 39.2 22nd 16.1 +1.5 11.5 9th 46.6 18.6 v high 251%
Eucla 25.5 -0.4 39.0 16th 17.7 +1.2 15.0 9th 14.2 14.6 high 97%
Eyre 26.2 -0.2 39.5 6th 15.8 +0.6 8.8 15th 6.0 15.8 average 38%
Forrest 31.9 -1.2 41.0 6th 16.7 +0.6 11.9 11th 24.8 24.2 high 102%
Red Rocks Point 24.6   36.9 6th 18.7   14.6 29th 7.8
South East (district 12)
Bulga Downs 33.6   42.8 29th 20.9   17.2 8th 65.8 28.2 high 233%
Kalgoorlie-Boulder Airport 32.1 -1.6 40.1 23rd 18.7 +0.4 13.0 8th 22.0 23.6 average 93%
Laverton Aero 31.7 -3.8 40.8 29th 19.8 -1.7 14.5 10th 78.6 41.8 high 188%
Leinster Aero 33.0 -4.4 41.3 29th 21.4 -1.8 17.8 13th 81.6 37.7 high 216%
Leonora 32.0 -5.1 42.0 29th 20.3 -1.4 16.4 31st 84.2 24.6 v high 342%
Leonora Aero 31.8   41.1 29th 20.5   16.9 31st 70.4
Munglinup West 29.1   40.9 28th 15.1   10.2 31st 19.4 52.5 average 37%
Norseman Aero 31.2 -1.3 39.5 28th 16.2 +0.5 9.2 8th 27.2 38.4 average 71%
Salmon Gums Res.Stn. 30.1 -0.5 40.2 22nd 14.6 +0.7 6.7 31st 49.0 26.9 high 182%
Southern Cross Airfield 33.2 -1.6 40.8 22nd 18.5 +1.0 11.3 8th 5.4 29.6 average 18%
Yeelirrie 34.0 -4.0 41.5 3rd 21.0 -1.3 18.0 2nd 63.3 28.5 high 222%
North East (district 13)
Carnegie 34.1 -4.8 40.8 29th 21.6 -2.2 17.0 10th 108.5 30.0 v high 362%
Giles Meteorological Office 34.6 -2.7 40.2 20th 21.4 -2.1 16.3 10th 105.4 30.5 v high 346%
Telfer Aero 36.8 -3.8 41.0 4th 24.4 -1.7 21.0 10th 135.0 49.1 v high 275%
Warburton Airfield 33.7 -4.3 40.6 22nd 21.6 -1.2 16.7 10th 128.6 29.0 v high 443%
Wiluna 34.9 -3.0 41.5 29th         38.8 35.2 high 110%
Offshore Islands (district 200)
Christmas Island Aero 27.3 -0.6 29.2 13th 22.6 0.0 21.6 16th 631.4 302.3 v high 209%
Cocos Island Airport 30.2 +0.5 31.1 21st 25.3 +0.5 24.0 1st 148.4 164.7 average 90%
Varanus Island 32.4 +0.4 35.6 21st 26.2 +0.1 24.0 1st 56.6 28.3 high 200%

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 4 pm on Wednesday 1 February 2012. 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.

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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