Western Australia in spring 2012: Second warmest spring on record for WA

  • Rainfall: above average for WA; near average for southwest WA
  • Maximum temperature: 2nd highest on record for WA
  • Minimum temperature: 3rd highest on record for WA

Rainfall

Rainfall during spring 2012 was above to very much above average in the western and northern Southwest Land Division (SWLD), with a number of sites, some with over 100 years of record, in the Central West, Lower West, and Great Southern observing their wettest spring on record. Rainfall totals were also above to very much above average in most districts, although it should be noted that rainfall totals are typically low in the northwest of WA during spring. Below average spring rainfall was mainly confined to the eastern Interior, parts of the South and Southeast Coastal, and small parts of central WA.

Averaged across WA as a whole, spring rainfall was above average for WA as well as the SWLD, but near average for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay). Comparable records commenced in 1900.

A strong cold front moved through western parts of WA on 3 September and into central parts of the state during the morning of the 4th, with widespread moderate rainfall observed through the western SWLD, and lighter falls extending into eastern parts of the SWLD, the Gascoyne, west Pilbara, and Goldfields. Heavy rainfall in the 40 to 70 mm range was observed at a number of locations in the Southwest and Lower West districts in the 24 hours to 9am on the 4th, and Alexandra Bridge in the Southwest recorded 55.2 mm, its highest September and spring daily fall in 42 years of record.

Showers and thunderstorms in the inland Pilbara on 24 and 25 October resulted in moderate falls with Newman Aerodrome recording 19.8 mm in the 24 hours to 9am on the 25th, its wettest October day in 37 years of record, while Paraburdoo Aerodrome recorded 25.2 mm in the 24 hours to 9am on the 26th, its wettest October and equal wettest spring day in 39 years of record.

Moderate to heavy rainfall was observed in the 24 hours to 9am on 22 November in northern, central, and eastern parts of the Southwest Land Division, the Goldfields, and Southern Interior. Carnegie in the Southern Interior observed its wettest spring day in 58 years of record with 38.4 mm.

Shower and thunderstorm activity was a consistent feature during November 2012 in the Kimberley and adjacent Pilbara and Interior, with numerous instances of heavy rainfall and severe wind gusts through the month. Warmun observed 102.0 mm in the 24 hours to 9am on the 29th, which is its wettest November and spring day in 82 years of record.

Maximum temperature

Mean daily maximum temperatures during spring 2012 were above to very much above average throughout most of WA, apart from in the far northeast Kimberley and coastal west Pilbara, which saw near average daytime maxima. Areas of highest on record were evident in the west Kimberley, eastern Southern Interior, and Eucla. Daytime maxima were up to 3 °C above average through large parts of central and southeastern WA, grading to up to 4 °C warmer than normal in parts of the Southern Interior and Eucla districts. Giles Meteorological Office, Eucla, and Albany Airport all observed their warmest spring on record, from records spanning 40 to 70 years.

When averaged across the state, the mean maximum temperature for spring 2012 ranked as 2nd highest on record, only behnd the spring of 2006, from comparable records back to 1950. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) recorded its 5th highest spring on record, with the springs of 2010, 2006, and 2000 ranking 1st to 3rd.

Minimum temperature

Minimum temperatures were above to very much above average through most of WA, with temperatures up to 2 °C above normal through much of the state, grading to up to 3 °C above normal in the western Northern Interior and east Pilbara. Only in the Kimberley were overnight minima were below average in spring, with up to 2 °C cooler than normal temperatrues in central and northern parts.

When averaged across the state, the mean minimum temperature for WA for spring 2012 was very above average, and ranked as the 3rd highest since comparable records commenced in 1950, behind 2006 and 1983, whilst the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) also recorded above average ovenight minima.

A cold front moving through the southern half of WA on 27 September was followed by a strong southerly stream which brought cold air to southwest WA. Minimum temperatures on the 28th were unusually low as a result and a number of sites recorded sub-zero minima. Karnet in the Lower West recorded a minimum of -0.6 °C, its lowest September and spring temperature in 48 years of recording.

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Extremes in spring 2012
Hottest day 46.4 °C at Roebourne on 15 Nov
Warmest days on average 39.7 °C at Fitzroy Crossing Aero
Coolest days on average 19.7 °C at Cape Leeuwin
19.7 °C at North Walpole
19.7 °C at Windy Harbour
Coldest day 9.8 °C at Mount Barker on 4 Sep
Coldest night -2.5 °C at Eyre on 30 Sep
Coolest nights on average 6.9 °C at Wandering
Warmest nights on average 24.2 °C at Wyndham
Warmest night 31.4 °C at Wittenoom on 15 Nov
Wettest overall 417.3 mm at Walpole
Wettest day 102.0 mm at Warmun on 29 Nov
Highest wind gust 117 km/h at Cape Naturaliste on 4 Sep
117 km/h at Rottnest Island on 28 Nov
117 km/h at Cape Leeuwin on 29 Nov

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 spring daily rainfall
Highest daily rainfall
in spring 2012 (mm)
Previous wettest
for spring
Years of
record
Warmun 102.0 on 29 Nov 92.8 on 19 Oct 2000 97
Carnegie 38.4 on 22 Nov 33.0 on 16 Nov 2008 58
Alexandra Bridge 55.2 on 4 Sep 53.0 on 21 Nov 1997 42
Paraburdoo Aero 25.2 on 26 Oct =25.2 on 29 Nov 2006 39



Record highest total spring rainfall
Total rainfall
for spring 2012 (mm)
Previous wettest
for spring
Years of
record
Average for
spring
Burracoppin 140.2 129.1 in 1965 110 56.3
Cowcowing 116.0 105.9 in 1918 104 48.8
Trayning 137.2 130.7 in 1983 102 55.0
Bencubbin 146.4 132.6 in 2006 98 51.4
Koorda 158.6 105.3 in 1958 96 47.4
Gabbin 130.8 123.7 in 2006 71 57.3
Goodlands 110.2 105.8 in 2011 62 46.2
Badgingarra Research Stn 175.0 167.2 in 1996 50 102.0
Bickley 374.0 349.7 in 1971 43 232.8
Culford 209.8 192.8 in 2011 42 130.3



Record highest spring mean daily maximum temperature
Mean daily maximum
temperature
for spring 2012 (°C)
Previous warmest
for spring
Years of
record
Average for
spring
Eucla 26.0 25.1 in 1980 68 22.9
Giles Meteorological Office 33.5 33.3 in 2006 56 31.1
Albany Airport 20.7 20.3 in 1982 47 19.0



Record lowest spring temperature
Lowest temperature
in spring 2012 (°C)
Previous coolest
for spring
Years of
record
Average for
spring
Karnet -0.6 on 28 Sep 0.0 on 22 Sep 2008 48 9.2



Summary statistics for spring 2012
Maximum temperatures
for spring
(°C)
Minimum temperatures
for spring
(°C)
Rainfall
for spring
(millimetres)
Mean for
spring
2012
Diff
from
average
Highest for
spring
2012
Mean for
spring
2012
Diff
from
average
Lowest for
spring
2012
Total for
spring
2012
Average
for
spring
Rank of
spring
2012
Fraction of
spring
average
North Kimberley (district 01)
Doongan 36.1 -0.2 38.8 7 Oct 19.3 -1.4 9.7 3 Sep 235.0 157.6 high 149%
Kalumburu 36.1 -0.4 39.2 13 Sep 21.4 -0.8 14.0 17 Sep        
Wyndham 38.0 -0.3 41.1 12 Nov 24.2 -1.0 17.1 17 Sep 132.2 81.6 high 162%
Wyndham Aero 38.7 -0.2 42.1 2 Nov 23.5 -1.0 15.5 16 Sep 114.0 79.4 high 144%
East Kimberley (district 02)
Argyle Aerodrome 38.4 +0.7 42.3 17 Nov 24.0 -0.5 16.8 9 Sep 57.6 97.7 average 59%
Halls Creek Airport 36.9 +0.4 42.1 23 Nov 22.0 0.0 15.2 10 Sep 76.6 59.8 high 128%
Kununurra Aero                 72.6 81.9 average 89%
Warmun 38.5 +0.5 43.1 8 Nov         231.4 88.4 v high 262%
West Kimberley (district 03)
Bidyadanga 35.2 +1.3 43.2 13 Nov         2.8 9.7 average 29%
Broome Airport 33.9 +1.2 39.9 2 Nov 22.8 +0.8 13.8 13 Sep 4.4 11.7 average 38%
Curtin Aero 39.6 +1.3 42.7 3 Nov 20.9 -0.5 11.9 1 Sep 14.8 29.6 average 50%
Derby Aero 37.5 +0.7 42.6 9 Nov 22.4 -0.3 12.8 11 Sep 2.4 16.7 average 14%
Fitzroy Crossing Aero 39.7 +0.5 43.6 24 Nov 21.9 -0.4 12.5 11 Sep 40.0 49.0 average 82%
West Roebuck 36.5 +1.1 42.4 2 Nov 20.9 +0.3 12.8 1 Sep 9.2 13.9 average 66%
De Grey (district 04)
Karratha Aero 33.8 +0.7 43.6 15 Nov 20.5 +0.4 12.2 6 Sep 0 3.4 lowest 0%
Mandora 36.3 +0.9 44.0 13 Nov 19.6 +0.8 10.9 3 Sep 3.8 8.7 average 44%
Marble Bar 39.0 +1.4 44.6 14 Nov 21.7 +1.2 10.5 6 Sep 28.6 18.0 high 159%
Port Hedland Airport 35.8 +1.4 42.4 14 Nov 19.7 +1.3 11.9 6 Sep 2.4 4.8 average 50%
Roebourne 37.4 +2.0 46.4 15 Nov 20.8 +1.1 11.8 6 Sep 0 3.6 lowest 0%
Roebourne Aero 37.3 +1.2 46.0 16 Nov 19.5 +0.4 10.6 6 Sep 0.2 7.8 average 3%
Fortescue (district 05)
Barrow Island Airport 29.2 +0.4 36.7 24 Oct 21.9 +0.7 16.9 6 Sep 0.4 5.3 average 8%
Learmonth Airport 33.0 +0.9 41.1 14 Nov 16.9 +0.7 10.0 5 Sep 0.4 5.7 average 7%
Mardie 34.6 +0.1 42.9 15 Nov 18.5 +1.3 11.2 6 Sep 0 3.7 lowest 0%
Onslow Airport 33.1 +0.8 42.5 14 Nov 19.3 +1.7 12.9 6 Sep 1.6 5.3 average 30%
Wittenoom 36.7 +1.9 43.7 16 Nov 21.6 +1.3 10.0 6 Sep 24.2 16.5 high 147%
West Gascoyne (district 06)
Carnarvon Airport 27.2 +1.2 41.9 10 Oct 16.9 +0.6 8.2 5 Sep 10.0 15.1 average 66%
Denham 26.4 +0.8 38.0 10 Oct         15.4 17.1 average 90%
Emu Creek Station 35.1 +1.2 42.0 21 Oct 17.7 +1.0 11.1 5 Sep 5.6 8.0 average 70%
Shark Bay Airport 28.5 +0.5 38.7 10 Oct 15.5 +0.4 8.8 29 Sep 25.0 14.8 high 169%
East Gascoyne (district 07)
Newman Aero 35.2 +1.1 42.3 16 Nov 18.6 +2.0 6.2 6 Sep 41.2 22.9 high 180%
Paraburdoo Aero 36.2 +1.2 43.4 17 Nov 18.6 +1.0 8.9 6 Sep 34.8 16.1 high 216%
Murchison (district 07A)
Meekatharra Airport 31.3 +1.8 41.0 14 Nov 16.2 +1.1 4.7 5 Sep 2.0 22.7 v low 9%
Mount Magnet Aero 29.9 +1.4 40.6 21 Oct 14.9 +0.9 4.8 28 Sep 31.0 26.9 average 115%
North Coast (district 08)
Carnamah 27.0 +1.0 40.1 17 Nov 11.8 +1.2 4.0 28 Sep 90.4 55.6 v high 163%
Dalwallinu 25.7 0.0 37.6 17 Nov 10.2 +0.5 2.6 28 Sep 76.6 50.9 high 150%
Geraldton Airport 26.1   38.3 1 Oct 12.3   3.5 30 Sep 58.4
Geraldton Airport Comparison 26.1 +1.5 38.1 27 Oct 12.4 +1.1 3.8 29 Sep 22.6 60.5 v low 37%
Kalbarri 27.5 +1.4 37.4 27 Oct 14.0 +1.3 7.9 2 Sep 39.2 45.5 average 86%
Morawa Airport 28.0 +0.5 39.8 17 Nov 11.6 +0.8 2.0 28 Sep 51.4 43.2 average 119%
Mullewa 28.4 +1.2 41.0 21 Nov 12.6 +1.3 5.4 5 Sep 54.0 43.6 average 124%
North Island 24.4 +1.0 33.4 27 Oct 17.4 +0.3 11.5 4 Sep 34.0 38.8 average 88%
Wongan Hills         10.9 +0.7 1.5 28 Sep 110.6 61.7 v high 179%
Central Coast (district 09)
Badgingarra Research Stn 24.4 0.0 36.9 17 Nov 10.2 +0.5 2.8 28 Sep 175.0 102.0 highest 172%
Bickley 21.2 +0.1 33.4 17 Nov 10.2 +0.4 3.7 28 Sep 374.0 232.8 highest 161%
Champion Lakes 23.0   34.7 17 Nov 12.7   3.6 28 Sep 203.6
Garden Island HSF 21.7 +0.6 33.0 1 Oct 14.0 +0.4 6.7 28 Sep 121.4 116.6 average 104%
Gingin Aero 24.6 +0.5 36.4 17 Nov 9.9 +0.5 1.7 24 Sep 174.0 143.4 high 121%
Gosnells City 24.6 +0.6 36.5 28 Oct 12.2 +0.1 3.3 28 Sep 176.5 156.4 average 113%
Jandakot Aero 23.7 +0.8 35.7 21 Nov 10.2 +0.2 1.0 28 Sep 199.4 165.0 high 121%
Jurien Bay 24.5 +1.1 35.2 21 Nov 12.2 +0.7 4.2 29 Sep 134.3 90.1 v high 149%
Karnet 21.0 +0.1 33.0 22 Nov 9.7 +0.5 -0.6 28 Sep 381.5 259.4 v high 147%
Lancelin 24.3 +1.7 36.0 1 Oct 12.3 +0.1 6.5 24 Sep 103.3 105.9 average 98%
Medina Research Centre 24.0 +1.1 36.2 21 Nov 11.4 +0.5 2.7 29 Sep 150.0 149.9 average 100%
Pearce RAAF 24.9 +1.5 36.9 17 Nov 10.6 +0.2 2.9 24 Sep 127.4 128.7 average 99%
Perth Airport 24.1 +1.3 36.1 17 Nov 11.1 +0.5 1.9 28 Sep 202.6 143.4 high 141%
Perth Metro* 24.1 +1.0 36.2 28 Oct 12.1 +0.5 3.8 28 Sep 164.6 155.2 average 106%
Rottnest Island 21.6 +1.0 31.1 1 Oct 14.6 +0.4 8.9 28 Sep 91.8 113.5 average 81%
Swanbourne 23.8 +1.5 35.8 21 Nov 12.9 +0.4 5.3 28 Sep        
South Coast (district 09A)
Albany 20.4 +1.7 33.4 21 Oct 11.8 +1.1 6.1 22 Sep 283.1 225.8 high 125%
Albany Airport 20.7   34.6 27 Nov 9.2   3.0 24 Sep 236.6
Albany Airport Comparison 20.5 +1.5 35.0 27 Nov 9.4 +0.1 3.3 24 Sep 219.6 205.7 high 107%
Bunbury 21.7 +0.5 32.3 21 Nov 10.0 +0.1 1.6 23 Sep 173.4 138.2 high 125%
Busselton Aero 22.0 +0.6 32.3 21 Nov 8.8 -0.1 1.6 28 Sep 165.8 141.7 average 117%
Cape Leeuwin 19.7 +1.2 28.8 1 Oct 13.8 +1.0 8.4 5 Sep 168.0 193.4 average 87%
Cape Naturaliste 20.8 +1.6 28.9 28 Oct 11.9 +0.6 6.2 28 Sep 159.4 152.9 average 104%
Collie East 22.0   33.3 21 Nov 7.6   -0.4 28 Sep 228.6 165.9 high 138%
Donnybrook 22.7 +1.1 33.5 21 Nov 9.7 +1.1 2.0 28 Sep 258.9 199.7 high 130%
Dwellingup 21.3 +1.0 32.9 21 Nov 8.9 +0.7 -0.6 28 Sep 408.6 258.4 v high 158%
Esperance 22.5 +1.3 37.2 18 Nov 11.8 +0.8 5.4 11 Oct 137.8 142.2 average 97%
Esperance Aero 23.1 +1.8 36.7 18 Nov 10.4 +0.4 3.3 6 Oct 136.0 139.5 average 97%
Harvey 22.2 +0.6 33.0 22 Nov 9.8 -0.2 2.0 29 Sep 227.6 202.4 average 112%
Hopetoun North 22.2 +0.5 38.4 21 Oct 9.2 -1.2 0.9 11 Oct 103.8 127.6 average 81%
Jarrahwood 22.0 +1.2 32.6 28 Oct 7.4 -0.3 -0.5 13 Sep 287.6 206.1 v high 140%
Mandurah 22.1 +0.5 33.1 21 Nov 13.9 +0.4 6.2 28 Sep 176.8 127.6 high 139%
Manjimup 20.7 +1.7 31.1 28 Oct 9.0 +0.5 2.6 5 Oct 242.0 232.8 average 104%
North Walpole 19.7   29.6 1 Oct 10.3   4.5 24 Sep
Pemberton 20.5 +1.6 30.5 1 Oct         332.2 281.3 high 118%
Rocky Gully 21.0 +1.6 33.2 27 Nov 8.3 +0.1 1.9 13 Sep 212.2 190.3 high 112%
Windy Harbour 19.7 +0.7 30.9 1 Oct 10.6 +0.1 4.6 8 Sep 265.9 222.4 high 120%
Witchcliffe 20.7 +1.0 29.6 28 Oct 9.0 -0.5 2.9 24 Sep 267.2 218.4 high 122%
North Central (district 10)
Bencubbin 25.7 +0.7 38.6 18 Nov 11.4 +1.4 1.5 28 Sep 146.4 51.4 highest 285%
Cunderdin Airfield 26.2 +0.8 38.5 18 Nov 9.0 +0.8 -0.2 28 Sep 64.6 58.1 high 111%
Kellerberrin 25.9 +1.1 38.0 18 Nov         121.9 56.7 v high 215%
Merredin 25.9 +1.3 39.3 18 Nov 11.2 +1.4 0.0 28 Sep 110.3 58.6 v high 188%
Northam 25.5 +1.2 36.9 17 Nov 9.5 +0.1 -0.5 28 Sep 100.6 74.2 high 136%
York 25.3 +0.8 37.4 17 Nov 7.0 -0.7 -1.3 28 Sep 100.7 77.7 high 130%
South Central (district 10A)
Beverley 25.5 +1.2 37.2 17 Nov 8.6 +0.2 -0.2 28 Sep 101.6 75.0 high 135%
Brookton 24.4 +1.2 36.3 28 Oct 8.7 +0.8 0.1 28 Sep 91.1 78.3 average 116%
Corrigin 24.8 +1.7 38.7 18 Nov 9.1 +0.7 -0.5 29 Sep 70.3 67.4 average 104%
Hyden 25.9 +1.5 40.0 18 Nov 9.5 +1.0 -0.4 23 Sep 125.6 68.5 v high 183%
Jacup 23.8 +2.3 37.8 27 Nov 8.1 +0.2 -0.1 23 Sep        
Katanning 23.0 +1.4 35.6 28 Oct 7.8 +0.1 -0.1 23 Sep 110.8 111.0 average 100%
Lake Grace 24.1 +1.1 37.3 18 Nov 9.7 +0.8 1.1 23 Sep 78.8 79.1 average 100%
Narembeen 25.8 +1.2 39.4 18 Nov 10.1 +1.1 0.9 28 Sep 114.7 61.3 v high 187%
Narrogin 22.9 +1.5 34.9 28 Oct 9.0 +1.2 1.0 29 Sep 120.6 96.2 high 125%
Newdegate Research Station 24.3 +1.4 38.2 18 Nov 7.7 +0.5 -2.0 23 Sep 78.0 78.7 average 99%
Ongerup 23.0 +2.0 36.2 27 Nov 8.9 +0.5 0.4 23 Sep 81.8 97.3 average 84%
Pingelly 23.8 +1.6 35.5 28 Oct 9.4 +0.7 1.4 28 Sep 105.0 81.0 high 130%
Ravensthorpe 23.7 +1.4 38.2 18 Nov 10.3 +1.2 1.3 23 Sep 92.6 108.5 average 85%
Wagin 23.2 +1.4 35.6 28 Oct 8.7 +0.5 0.3 23 Sep 91.8 88.5 average 104%
Wandering 22.7 +0.2 35.4 28 Oct 6.9 +0.2 -1.0 28 Sep 155.0 104.6 high 148%
Eucla (district 11)
Balladonia 26.5 +1.5 37.5 13 Oct 9.9 +0.9 2.5 24 Sep 87.8 66.0 high 133%
Eucla 26.0 +3.1 43.3 19 Nov 12.0 +0.7 2.1 14 Sep 24.0 58.5 low 41%
Eyre         9.7 -0.2 -2.5 30 Sep 54.0 63.8 average 85%
Forrest 29.4 +2.5 43.5 19 Nov 10.8 +0.3 2.8 11 Oct 20.6 48.3 low 43%
Red Rocks Point 24.6   41.6 22 Oct 12.6   4.6 9 Sep 47.6
South East (district 12)
Bulga Downs 30.1   42.4 18 Nov 13.7   3.6 5 Sep 37.3 27.0 high 138%
Kalgoorlie-Boulder Airport 26.8 +1.1 39.8 14 Nov 12.4 +1.4 2.6 28 Sep 76.0 47.5 high 160%
Laverton Aero 30.0 +2.3 41.3 14 Nov 14.6 +0.9 5.1 5 Sep 36.6 42.4 average 86%
Leinster Aero 30.4 +1.4 42.0 18 Nov 15.1 +0.7 4.6 29 Sep 27.2 35.1 average 77%
Leonora 30.0 +1.4 42.0 14 Nov 14.5 +0.9 5.1 28 Sep 49.2 31.0 high 159%
Leonora Aero 29.7   42.0 14 Nov 14.5   4.1 9 Sep 54.2
Munglinup West 24.0 +1.1 38.8 18 Nov 9.8 +0.6 2.6 28 Sep
Norseman Aero 26.0 +0.6 37.5 18 Nov 9.8 +0.6 -0.4 13 Sep 102.2 65.5 high 156%
Salmon Gums Res.Stn. 25.0 +1.7 36.8 18 Nov 8.7 +0.9 -0.3 26 Oct 96.4 85.3 average 113%
Southern Cross Airfield 26.5 +0.7 40.2 18 Nov 10.5 +1.6 -1.3 28 Sep        
North East (district 13)
Carnegie 34.1 +2.0 43.2 14 Nov 16.8 +1.2 4.3 6 Sep 61.2 22.7 v high 270%
Giles Meteorological Office 33.5 +2.4 41.4 28 Nov 17.9 +1.3 5.8 8 Sep 13.2 54.3 low 24%
Telfer Aero 38.1 +1.8 44.6 14 Nov 22.0 +1.8 12.7 6 Sep 27.0 21.9 high 123%
Warburton Airfield 33.4 +2.2 42.4 19 Nov 16.6 +1.5 2.3 6 Sep 63.0 45.7 high 138%
Wiluna 32.1 +2.0 42.0 18 Nov 15.4 +1.6 3.5 29 Sep 31.8 23.0 high 138%
Offshore Islands (district 200)
Christmas Island Aero 27.5 +0.8 29.2 20 Nov 23.3 +0.7 21.2 7 Sep        
Cocos Island Airport 28.9 +0.3 30.6 27 Nov 24.6 +0.4 20.9 23 Sep 129.2 280.1 average 46%
Varanus Island 29.2 +0.6 33.8 10 Nov 22.6 +0.4 18.8 5 Sep 0 2.5 v low 0%

Notes

A Seasonal 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 2 pm on Monday 3 December 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.
The median is sometimes more representative than the mean of long-term average rain.

*Official Perth observations have been recorded at several different sites with varying instrumentation over the years, and these changes can affect the continuity of the climate record. For the current Mt Lawley site, the most significant changes of this kind relate to minimum temperature and rain days.

For that reason, current mean temperature and rain-day data quoted here are based only on readings from the Mt Lawley site, which commenced observations in 1993. Sunshine recordings are from Perth Airport and for similar reasons current means use only Perth Airport data, which commenced in 1993.

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

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.

Further information

Media
(03) 9669 4057
Enquiries