Western Australia in November 2011: Fifth wettest November on record

  • Rainfall: 5th wettest for WA; 10th wettest for southwest WA
  • Maximum temperature: Below average for WA; above average for southwest WA
  • Minimum temperature: Below average for WA; above average for southwest WA.

Rainfall

November 2011 rainfall was above to very much above average for most of WA and a number of sites in the Kimberley, Pilbara, Gascoyne, Central Wheat Belt, Great Southern, Southeast Coastal, and Goldfields registered their wettest November on record. Below average rainfall was mainly confined to the Eucla, and small areas of the southern Goldfields, northern Central West, and west Kimberley (see November 2011 rainfall totals & deciles ).

When averaged across the state, November 2011 was the fifth wettest November on record for WA (comparable records commenced in 1900), whilst November rainfall for the Lower Southwest (southwest a line from Jurien Bay to Bremer Bay) ranked as tenth wettest on record.

November 2011 started with a surface low over the west Pilbara that extending to the middle levels of the atmosphere and brought widespread rainfall to northern and central WA on the 1st and 2nd. Heavy rainfall with daily falls over 50 mm were recorded in a number of locations in the Pilbara, Gascoyne and northern Goldfields, and some sites, particularly in the Pilbara, also experienced their wettest November day on record . Cossack on the Pilbara coast had its wettest November day in 49 years of record with a daily total of 97.0 mm on the 2nd, which was also the highest daily rainfall of the month for WA. The surface trough over the west of the state extended southward and combined with an approaching middle level disturbance on the 3rd and 4th to produce widespread rainfall and thunderstorms across the southern half of WA, with daily falls over 40 mm registered at numerous sites in the Central Wheat Belt, Great Southern, South and Southeast Coastal on the 4th. Several daily rainfall records for November were broken in these districts and a number of these sites have over 100 years of rainfall recording history. Heavy storms over the central Kimberley on the afternoon of the 16th brought significant rainfall to Gibb River as 71.0 mm was recorded in the 24 hours to 9am on the 17th, a new November daily rainfall record for the site. A surface trough over the Pilbara and near the west coast, along with a supporting middle level feature brought significant thunderstorm activity to central parts of the state on the 20th and produced a number of daily falls over 50 mm in the northeast Gascoyne and a few November daily rainfall records in the 24 hours to 9am on the 21st.

Maximum temperature

November 2011 maximum temperatures were above to very much above average in the southern coastal areas, and parts of the west Kimberley and west Gascoyne, with mean maxima up to 3°C above normal in the eastern Eucla and Shark Bay region of the Gascoyne. However, below average maxima were observed across much of WA, in most of the Kimberley, central and east Pilbara, Interior, inland Gascoyne, and northern Goldfields, with daytime temperatures up to 4 °C below normal in the east Kimberley and northern Interior (see November 2011 mean maximum temperature deciles & anomaly maps).

When averaged across the state, the maximum temperature during November 2011 was below average. In contrast, the Lower Southwest experienced above average daytime temperatures during November 201. This continues the trend of above average maximum temperatures in the Lower Southwest for all months this year, and consequently the January to November period has been the warmest first 11 months of the year for the region since comparable records commenced in 1950.

Western and southern parts of the state experienced a few unseasonally hot days in the latter part of the month when a high pressure system moved slowly south of the state directing hot and dry northeasterly winds over the region. Daily maxima reached the mid-to-high 30s near the west coast and southern coastal strips, and were more than 10 °C above the long-term monthly average.

Minimum temperature

November 2011 mean minimum temperatures were above to very much above average in most of the Southwest Land Division (SWLD), eastern Eucla, west Gascoyne, and coastal Pilbara, with means up to 3°C above normal near the eastern Eucla coast. Below to very much below average mean minima were experienced in most of the Kimberley, in the northern and central Interior, east Pilbara and inland Gascoyne, with means up to 3 °C cooler than normal in the southeast Kimberley and northeast Interior (see November 2011 minimum temperature deciles & anomaly maps).

November 2011 was below average in terms of mean minimum temperature when averaged across the state, whilst the Lower Southwest was above average. Mean minimum temperatures have been consistent with mean maximum temperatures in the Lower Southwest, and again all 11 months of 2011 have been above average in terms of mean minima, and thus the Lower Southwest has recorded its warmest January to November period on record for overnight temperatures.

Although no individual minimum temperature records were broken during the month, many locations in the Central West and Lower West endured uncomfortable warm nights on the 23rd and 24th with daily minima in low 20s.

Other Phenomena

Severe thunderstorms developed in the SWLD in the afternoon on the 3rd with very heavy rainfall reported. Roof damage was reported in Beverley in the Central Wheat Belt, whilst local flooding and property damage was reported from Bokal in the Southwest, and minor roof damage and flooding was also reported in Albany in the South Coastal district.

 

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Extremes in November 2011
Hottest day 44.0 °C at Roebourne on the 13th
Warmest days on average 39.4 °C at Marble Bar
Coolest days on average 21.4 °C at Shannon
Coldest day 15.0 °C at Mount Barker on the 8th
Coldest night 1.1 °C at Eyre on the 21st
Coolest nights on average 9.7 °C at Jarrahwood
Warmest nights on average 27.5 °C at Troughton Island
26.2 °C at Wyndham (mainland)
Warmest night 29.2 °C at Troughton Island on the 30th
29.0 °C at Wyndham (mainland) on the 8th
Wettest overall 247.2 mm at Kalumburu
Wettest day 97.0 mm at Cossack on the 2nd
Highest wind gust 124 km/h at Newman Aero on the 20th

Record highest November daily rainfall
Highest daily rainfall
in November 2011 (mm)
Previous highest
for November
Years of
record
Mardie 24.8 on the 2nd 24.1 on the 5th in 1931 124
Roebourne 18.9 on the 2nd 16.8 on the 16th in 1934 120
Wiluna 38.0 on the 1st 37.4 on the 3rd in 1975 106
Narrogin 46.6 on the 4th 38.1 on the 27th in 1965 105
Brookton 48.7 on the 4th 33.0 on the 17th in 1983 104
Bonney Downs 40.0 on the 1st 33.5 on the 10th in 1916 103
Bulloo Downs 52.4 on the 21st 50.0 on the 23rd in 2008 87
Gibb River 71.0 on the 17th 65.5 on the 20th in 1950 87
Holt Rock 29.2 on the 4th 27.9 on the 13th in 1937 80
Mount Vernon 64.4 on the 21st 44.6 on the 22nd in 2008 73
Wittenoom 44.8 on the 2nd 22.0 on the 23rd in 2008 57
Swanara 51.0 on the 4th 30.5 on the 6th in 1996 51
Albany Airport 58.2 on the 4th 32.4 on the 21st in 2008 49
Cossack 97.0 on the 2nd 18.8 on the 28th in 1894 49
Kojonolokan Hills 45.8 on the 4th 26.4 on the 19th in 2001 49
Tangadee 57.4 on the 21st 43.9 on the 23rd in 1973 49
Jerramungup 41.0 on the 4th 32.0 on the 17th in 1983 45
Denbarker 54.4 on the 4th 49.0 on the 21st in 2008 40
Karratha Aero 37.8 on the 2nd 4.0 on the 22nd in 1980 37
Karara 25.6 on the 4th 19.1 on the 15th in 1929 33



Record highest total November rainfall
Total rainfall
for November 2011 (mm)
Previous highest
for November
Years of
record
Average for
November
Wiluna 70.9 63.8 in 1975 114 11.0
Bulloo Downs 83.6 63.0 in 2008 88 9.5
Gibb River 204.4 166.3 in 1973 87 60.1
Woodanilling 90.6 86.4 in 1984 77 22.4
Mount Vernon 93.6 73.4 in 2008 72 8.3
Balgo Hills 140.3 110.6 in 1998 64 23.6
Swanara 54.2 49.6 in 1973 51 17.1
Tangadee 125.4 45.4 in 1973 49 11.3
Kojonolokan Hills 102.2 72.4 in 1984 47 21.5
Jerramungup 95.0 73.3 in 1965 45 30.3
Karratha Aero 38.0 4.0 in 1980 37 1.6
Newman Aero 79.2 65.2 in 2009 37 12.2
Desert Fringe 52.0 49.6 in 1993 31 24.5



Summary statistics for November 2011
Maximum temperatures
for November
(°C)
Minimum temperatures
for November
(°C)
Rainfall
for November
(millimetres)
Mean for
November
2011
Diff
from
average
Highest for
November
2011
Mean for
November
2011
Diff
from
average
Lowest for
November
2011
Total for
November
2011
Average
for
November
Rank of
November
2011
Fraction of
November
average
North Kimberley (district 01)
Doongan 34.3 -2.5 38.8 30th 22.1 -0.8 19.9 15th 133.4 114.1 average 117%
Kalumburu 35.4 -1.9 38.1 8th 23.8 -1.0 21.1 4th 247.2 78.9 v high 313%
Mount Elizabeth 33.6 -2.8 37.9 30th 21.3 -0.3 17.6 26th 120.5 71.7 high 168%
Troughton Island 32.9 0.0 34.3 29th 27.5 +0.1 24.9 21st 17.6 9.4 high 187%
Truscott 35.0   37.5 26th 25.7   23.0 11th 44.0
Wyndham 37.1 -2.4 41.1 29th 26.2 -1.0 23.3 10th 43.0 53.2 average 81%
Wyndham Aero 38.1 -1.9 42.3 30th 25.8 -0.9 23.2 5th 44.0 53.3 average 83%
East Kimberley (district 02)
Argyle Aerodrome 35.5 -3.3 40.7 30th 24.4 -1.8 21.6 20th        
Halls Creek Airport 35.3 -3.1 40.9 30th 22.6 -1.9 18.7 3rd 73.6 37.2 high 198%
Warmun 36.1 -3.2 41.3 30th 24.0 -1.0 21.4 18th 113.2 59.0 v high 192%
West Kimberley (district 03)
Bidyadanga 34.5 -0.4 39.8 25th 24.1 +0.2 20.1 2nd 0.7 7.8 average 9%
Broome Airport 34.3 +0.7 41.0 26th 25.6 +0.5 21.6 3rd 0 8.9 lowest 0%
Curtin Aero 38.5 -1.4 42.5 26th 23.8 -0.3 20.7 2nd 44.2 24.3 high 182%
Cygnet Bay 35.1 -0.2 38.0 30th 24.2 +0.2 22.4 6th 5.0 5.0 high 100%
Derby Aero 37.9 -0.2 42.2 30th 25.0 -0.5 20.6 2nd 8.6 13.0 average 66%
Fitzroy Crossing Aero 37.7 -3.3 43.0 30th 23.6 -2.0 19.5 2nd 92.8 30.1 v high 308%
West Roebuck 36.5 +0.3 42.3 26th 23.1 -0.6 20.1 3rd 1.6 10.4 low 15%
De Grey (district 04)
Karratha Aero 34.0 -1.0 40.3 13th 22.4 -0.6 19.1 2nd 38.0 1.6 highest 2375%
Legendre Island 31.0   35.4 13th 23.9   20.1 2nd
Mandora 35.1 -1.5 40.2 27th 22.0 +0.3 18.0 27th 34.7 6.6 v high 526%
Marble Bar 39.4 -1.0 43.3 27th 22.9 -0.9 19.7 1st 10.8 8.1 average 133%
Pardoo Station 34.9 -1.7 39.2 30th         3.0 3.3 high 91%
Port Hedland Airport 35.0 -1.2 40.6 19th 21.9 +0.6 18.3 9th 17.8 2.7 v high 659%
Roebourne 36.8 -1.2 44.0 13th 21.5 -1.1 17.2 10th 19.3 1.5 v high 1287%
Roebourne Aero 36.6 -2.2 43.5 13th 21.4 -1.0 16.3 10th 28.2 4.0 v high 705%
Fortescue (district 05)
Barrow Island Airport 30.7 +0.4 35.7 26th 22.9 +0.1 20.2 1st 0 2.2 v low 0%
Learmonth Airport 35.5 +1.1 41.6 14th 18.6 +0.2 15.4 8th 0.2 2.0 high 10%
Mardie 35.4 -1.0 41.4 13th 21.0 +1.0 18.1 10th 25.0 1.5 v high 1667%
Onslow 34.0 +0.2 40.7 13th 21.5 +2.3 18.4 8th 0 1.5 lowest 0%
Onslow Airport 34.5 +0.2 41.0 13th 21.4 +1.5 17.8 30th 0 3.0 lowest 0%
Wittenoom 36.8 -1.2 41.0 18th 22.4 -1.2 15.6 2nd 49.3 9.5 v high 519%
West Gascoyne (district 06)
Carnarvon Airport 29.8 +2.3 39.0 23rd 18.9 +0.3 16.6 2nd 5.8 4.1 high 141%
Denham 28.6 +0.9 38.0 23rd 19.6 +1.1 17.0 29th 2.2 3.1 high 71%
Emu Creek Station 37.2 +0.4 43.0 15th 19.7 +0.4 14.5 30th 1.2 3.9 high 31%
Gascoyne Junction                 1.2 3.5 average 34%
Murchison 33.2 -0.9 38.4 16th 16.6 +0.3 12.0 26th 3.0 6.1 average 49%
Shark Bay Airport 31.0 +0.7 38.6 23rd 17.4 -0.1 14.9 17th 7.0 1.3 v high 538%
East Gascoyne (district 07)
Newman Aero 35.2 -2.2 39.9 12th 20.2 -0.6 15.5 23rd 79.2 12.2 highest 649%
Paraburdoo Aero 37.2 -1.1 42.0 14th 21.2 -0.1 17.5 3rd 8.0 8.3 average 96%
Murchison (district 07A)
Meekatharra Airport 32.1 -1.1 39.3 16th 18.0 -0.7 13.6 9th 29.8 11.8 v high 253%
Mount Magnet Aero 31.6 -0.8 37.9 16th 16.9 -0.9 11.0 9th 3.6 10.5 average 34%
North Coast (district 08)
Carnamah 29.0 -1.1 35.6 25th 13.9 +0.6 9.1 9th 33.4 10.5 v high 318%
Dalwallinu 29.2 -1.3 37.7 25th 12.9 +0.1 7.7 9th 13.0 6.2 high 210%
Dalwallinu Comparison 28.6 -0.8 36.0 25th 13.5 +0.2 8.5 9th 14.8 11.8 average 125%
Eneabba                 13.8 14.4 average 96%
Geraldton Airport 27.9   38.1 24th 14.3   9.3 10th 17.6
Geraldton Airport Comparison 27.5 +0.3 37.2 24th 14.3 +0.5 9.3 10th 14.8 9.3 high 159%
Kalbarri 29.7 +1.5 38.6 23rd 15.3 +0.5 9.6 10th 1.5 6.9 average 22%
Morawa Airport 30.6 -1.4 37.8 25th 14.0 -0.3 7.5 9th 13.6 8.3 high 164%
Mullewa 30.7 -0.4 36.4 25th 14.9 +0.6 10.1 9th 4.0 8.7 average 46%
North Island 26.1 +1.0 32.8 23rd 18.8 +0.4 16.1 9th 3.4 7.2 average 47%
Wongan Hills 28.6 -0.4 36.4 25th 12.5 -0.6 8.0 9th 30.2 12.0 v high 252%
Central Coast (district 09)
Badgingarra Research Stn 27.7 -0.6 37.1 24th 12.6 +0.4 7.2 9th 15.6 18.6 average 84%
Bickley 23.5 -1.4 34.0 24th 12.3 +0.6 8.5 30th 64.6 41.9 high 154%
Champion Lakes 25.0   35.1 24th 14.9   10.6 9th
Garden Island HSF 24.1 +0.3 36.9 24th 16.4 +0.8 12.9 30th 14.2 24.0 low 59%
Gingin Aero 26.7 -1.2 37.6 24th 13.3 +1.5 7.3 10th 29.8 18.1 high 165%
Gooseberry Hill 24.7 -1.7 35.5 24th 13.9 +0.4 10.3 30th
Gosnells City 26.7 -0.7 38.2 24th 14.5 +0.2 10.3 28th 44.8 28.7 high 156%
Jandakot Aero 25.8 -0.4 37.3 24th 13.8 +1.4 7.2 19th 31.6 29.0 average 109%
Jurien Bay 26.7 +0.9 37.6 23rd 15.1 +1.6 10.0 16th 19.0 17.9 average 106%
Karnet 23.6 -0.8 34.1 24th 12.0 +0.7 6.7 9th 62.9 46.5 high 135%
Lancelin 25.8 +1.0 37.7 23rd 14.9 +0.8 10.0 10th 18.0 20.9 average 86%
Medina Research Centre 26.1 +0.2 38.7 24th 14.7 +1.4 9.1 19th 24.2 32.1 average 75%
Pearce RAAF 26.2 -0.9 37.8 24th 13.6 +1.1 8.4 10th 29.2 23.4 average 125%
Perth Airport 26.1 +0.3 37.2 24th 14.1 +1.4 9.1 10th 39.4 26.1 high 151%
Perth Metro 25.9 -0.5 37.2 24th 14.9 +0.8 10.2 10th 29.0 22.1 average 131%
Rottnest Island 23.0 0.0 32.2 23rd 16.7 +0.9 13.4 9th 19.4 17.2 average 113%
Swanbourne 25.6 +0.4 36.0 24th 15.5 +0.9 10.9 19th 35.2 23.9 high 147%
South Coast (district 09A)
Albany 21.5 +1.2 34.9 24th 13.5 +1.1 10.2 9th 76.6 44.9 v high 171%
Albany Airport 22.0 +1.2 35.1 24th 11.0 +0.2 6.7 27th 103.6 47.3 v high 219%
Bridgetown Comparison 24.0 -0.3 34.5 24th 10.3 +1.5 4.2 30th 40.4 32.5 high 124%
Bunbury 24.0 -0.3 33.3 24th 12.6 +0.5 6.0 15th 31.8 25.2 average 126%
Busselton Aero 24.4 -0.5 32.6 24th 11.3 +0.7 6.1 9th 51.0 23.8 v high 214%
Cape Leeuwin 21.9 +1.8 33.5 24th 15.4 +1.2 12.1 20th 54.4 37.2 high 146%
Cape Naturaliste 22.9 +1.5 29.7 23rd 13.8 +1.3 9.1 30th 36.0 26.2 high 137%
Collie East 23.9   33.9 24th 9.9   4.5 9th  
Donnybrook 24.8 0.0 35.9 24th 11.9 +1.5 6.5 9th 76.8 33.4 v high 230%
Dwellingup 23.6 0.0 34.4 24th 11.6 +1.3 6.5 19th 138.6 46.7 v high 297%
Esperance 24.3 +1.2 38.3 25th 13.5 +0.8 9.8 9th 68.4 34.1 high 201%
Esperance Aero 24.6 +0.6 37.2 25th 12.5 +0.6 9.3 9th 56.0 36.3 high 154%
Harvey 24.1 -1.1 34.2 24th 11.8 -0.1 7.0 19th 62.8 38.0 v high 165%
Hopetoun North 24.1 +0.8 36.2 25th 12.8 +0.5 8.7 16th 76.6 38.3 high 200%
Jarrahwood 23.9 +0.3 34.2 24th 9.7 +0.2 3.7 15th 40.6 42.7 average 95%
Mandurah 24.1 -0.6 32.9 2nd 16.4 +0.9 12.1 9th 45.0 25.1 high 179%
Manjimup 22.1 +0.2 34.4 24th 10.6 +0.5 5.9 30th        
North Walpole 21.7   33.4 24th 12.3   8.5 15th  
Pemberton 22.2 +0.9 33.7 24th 11.6 +1.3 6.1 30th 83.0 61.3 high 135%
Rocky Gully 22.5 -0.6 34.3 24th 10.2 +0.4 4.5 30th        
Shannon 21.4 -0.9 32.8 24th 10.3 +0.2 4.7 30th        
Windy Harbour                 82.0 42.8 high 192%
Witchcliffe 23.0 +0.4 33.1 24th 11.2 +0.4 5.5 30th 45.4 36.1 high 126%
North Central (district 10)
Bencubbin 28.4 -0.6 36.5 25th 14.0 +1.0 9.1 9th 15.6 12.7 high 123%
Cunderdin Airfield 28.7 -1.3 38.3 25th 12.4 +0.3 7.5 10th 60.6 14.7 v high 412%
Kellerberrin 28.6 -0.3 38.3 25th 12.0 -0.2 7.0 9th 56.2 12.2 v high 461%
Merredin 28.9 +0.4 37.8 25th 13.9 +0.8 7.5 9th 13.4 14.0 average 96%
Northam 28.1 -0.4 37.2 24th 12.2 -0.2 7.0 10th 16.9 12.2 high 139%
York 27.8 -1.4 36.6 24th 12.0 +1.0 5.0 9th 30.4 15.8 high 192%
South Central (district 10A)
Beverley 27.5 -1.0 36.0 24th 12.8 +1.3 8.0 9th 58.4 15.0 v high 389%
Brookton 26.7 -0.8 35.8 24th 11.9 +1.0 6.3 9th 58.5 14.8 v high 395%
Corrigin 27.0 0.0 37.3 25th 12.3 +1.0 6.7 9th 51.2 16.4 v high 312%
Hyden 28.2 -0.2 38.6 25th 12.4 +1.0 6.5 9th 25.8 18.0 high 143%
Jacup 24.7 +0.2 37.0 25th 10.2 +0.4 4.9 28th 64.2 32.5 high 198%
Katanning 24.7 -1.4 34.8 24th 10.4 +0.5 4.3 30th 76.4 26.8 v high 285%
Katanning Comparison 24.1 -1.0 34.4 24th 11.2 +1.2 5.8 30th 78.4 22.0 v high 356%
Lake Grace 26.1 -0.9 37.5 25th 12.1 +0.4 6.5 30th 52.8 24.1 high 219%
Lake Grace Comparison 26.0 -0.5 36.8 25th 12.0 +0.6 6.4 30th 49.0 18.5 v high 265%
Narembeen 28.5 0.0 37.2 25th 13.2 +1.0 7.1 9th 23.2 15.8 high 147%
Narrogin 24.8 -0.7 34.6 24th 11.8 +1.8 5.8 9th 59.0 18.2 v high 324%
Newdegate Research Station 26.7 -0.4 38.0 25th 10.1 +0.2 3.5 30th 37.6 21.4 high 176%
Ongerup 24.3 0.0 34.0 25th 11.3 +0.8 6.2 29th 86.4 25.7 v high 336%
Pingelly 25.9 -0.3 35.2 24th 12.1 +0.8 6.0 9th 32.6 15.3 high 213%
Ravensthorpe 25.4 +0.4 36.6 25th 11.3 +0.3 6.8 30th        
Wagin 25.2 -0.4 34.6 24th 11.3 +0.7 6.1 30th 63.2 18.1 v high 349%
Wandering 25.1 -2.3 35.1 24th 10.2 +0.9 4.0 19th 30.6 17.3 high 177%
Eucla (district 11)
Balladonia 28.0 +0.1 36.7 17th 11.9 +0.6 6.1 30th 10.4 21.9 average 47%
Eucla 27.0 +2.8 42.0 17th 14.5 +1.2 7.2 10th 9.2 18.2 average 51%
Eyre 26.3 +2.1 38.1 17th 10.8 -1.2 1.1 21st 7.4 20.2 low 37%
Forrest 30.8 +1.1 41.1 17th 13.0 0.0 6.9 25th 1.0 20.9 v low 5%
Red Rocks Point 25.4   41.0 17th 15.0   7.9 10th 8.2
South East (district 12)
Bulga Downs 32.4   40.5 26th 15.6   9.9 9th 15.8 10.6 high 149%
Kalgoorlie-Boulder Airport 28.9 -0.1 38.6 26th 14.3 +0.2 9.9 30th 12.4 17.5 average 71%
Laverton Aero 30.4 -0.4 38.5 17th 16.4 -0.5 12.2 30th 48.0 20.2 high 238%
Leinster Aero 31.7 -0.7 39.3 11th 17.6 -0.5 13.1 21st 42.2 18.1 high 233%
Leonora 31.5 -0.7 39.8 27th 16.8 -0.2 12.4 10th 39.0 12.3 v high 317%
Leonora Aero 31.0   38.9 26th 17.1   12.5 10th 37.6
Munglinup West 25.8   37.7 25th 11.6   7.4 30th 44.4 31.7 high 140%
Norseman Aero 28.7 -0.1 36.5 25th 12.2 +0.1 4.8 30th 14.8 19.6 average 76%
Salmon Gums Res.Stn. 27.2 +0.9 37.6 25th 10.8 +0.7 1.6 30th 22.4 25.7 average 87%
Southern Cross Airfield 28.4 -1.6 34.8 16th 13.0 +0.1 8.1 9th        
Yeelirrie 32.8 -0.1 40.0 17th 16.2 0.0 10.0 21st 19.4 10.1 high 192%
North East (district 13)
Carnegie 33.7 -1.7 39.6 27th 18.5 -0.6 12.2 22nd 11.9 12.1 average 98%
Giles Meteorological Office 32.1 -2.2 38.9 28th 18.7 -1.2 11.5 23rd 44.2 27.9 high 158%
Telfer Aero 37.0 -2.4 40.9 28th 21.8 -1.6 16.8 21st 71.0 16.3 v high 436%
Warburton Airfield 32.9 -1.4 40.3 28th 18.0 -0.5 13.0 22nd 61.0 24.0 high 254%
Wiluna 32.6 -1.4 39.8 17th 17.9 +0.1 12.2 21st 70.9 11.0 highest 645%

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 Thursday 1 December 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, 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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