Western Australia in August 2012: A very warm and dry month

  • Rainfall: 9th driest on record for WA; below average for southwest WA
  • Maximum temperature: 2nd highest for WA; above average for southwest WA
  • Minimum temperature: near average

Rainfall

Rainfall during August 2012 was below to very much below average throughout much of WA (see the maps below). Rainfall was particularly low in the southeast of the state where several sites in the Eucla recorded less than 3 mm for the month and Eyre observed its lowest August rainfall in 83 years of record (see the records tables below). No rainfall was reported in the Kimberley during the month, as is typical in August; however, coastal parts of the Kimberley did report a high number of fog and dew events and so above average "rainfall" in these areas was the result of condensation rather than precipitation. For WA as a whole, August 2012 ranked 9th driest on record, whilst for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) and for the Southwest Land Division (SWLD) rainfall was also below average.

Heavy rainfall in the Central West due to a cold front and developing cloudband on the last day of July 2012 resulted in a few stations observing their highest August daily rainfall on record, with totals in the 24 hours to 9am on the 1st in the 45 mm to 50 mm range. A generally westerly flow and a series of cold fronts over southern WA during the first week of August 2012 brought consistent rainfall to the region, although daily totals after the 1st were mostly only light to moderate. The most significant rainfall amounts during this period were due to a cold front moving across southern WA on the 6th and 7th, with moderate rainfall observed in parts of the Lower West, Southwest, and Great Southern, followed by isolated thunderstorms and small hail in southern parts of the Southwest and South Coastal districts in the cold airmass behind the front on the 8th. Karnet observed the highest fall during the event of 44.0 mm in the 24 hours to 9am on the 7th. A ridge developed over the south of the state in the wake of the front on the 8th, with a strong high moving into the Bight from the 9th to the 11th maintaining generally clear conditions across WA. A cloudband with areas of rain extended across the SWLD on the 12th, and into the southern Gascoyne and Goldfields during the evening, with moderate to heavy falls observed in the Lower West and Southwest districts. The highest daily total in the 24 hours to 9am on the 13th was 53.0 mm at Mundaring, which was the highest daily total at the site for over six months, since 68.8 mm was observed on 20 January 2012. The cold front and cloudband moved eastward through southern WA on the 13th, clearing to the east of the state in the evening with generally light showers observed with the front. A ridge developed across southern WA in the wake of the front on the 13th and remained the main synoptic feature through to the 18th, with mostly clear conditions over WA apart from some showers along the south coast. A surface trough moved eastward through central WA on the 19th as a cold front moved through the Bight with cloud extending over much of southern WA from the west, and isolated showers observed in far southern parts of the SWLD. On the 20th, the cold front moved eastward across the Eucla coast as a low approached the southwest corner of the state late in the evening, with isolated light showers over central and southern parts of the SWLD, as well as the adjacent southern Goldfields, extending into coastal parts of the Central West in the evening. A trough and cold front moved through southern WA on the 21st and 22nd, with light to moderate rainfall observed throughout the SWLD and adjacent parts of neighbouring districts, whilst a southwesterly flow behind the front brought generally light falls to southern parts of the SWLD and Eucla in the 24 hours to 9am on the 23rd. A ridge developed over the south of the state on the 24th with generally clear conditions persisting until the 26th, apart from isolated showers along the south coast and showers and thunderstorms in the northern Goldfields early on the 25th due to a mid-level disturbance. A westerly flow over the southwest of the state from the 27th through to the 29th with embedded weak cold fronts brought isolated showers to mainly southern and western parts of the SWLD, before showers contracted to southern coastal parts on the 30th as a ridge developed over the south of the state. A cold front moved into the SWLD on the last day of the month bringing light showers to the southwest corner, slowly extending throughout the SWLD during the day.

The Lower Southwest has recorded its 5th driest January to August period on record, largely as a result of registering its 8th driest autumn and 6th driest winter, which included the driest July on record, since comparable records commenced in 1900. The SWLD has similarly recorded its 6th driest January to August period in 2012 as a result of recording its 6th driest autumn and 9th driest winter, including the 2nd driest July on record.

Maximum temperature

Maximum temperatures during August were above to very much above average throughout WA, with areas of highest on record in large parts of the Pilbara and west Kimberley as a number of sites registered their warmest August on record. Southern parts of the Pilbara, and the northern and central inland Gascoyne saw mean maximum temperatures up to 5 °C warmer than normal. When averaged across the state as a whole the mean maximum temperature during August 2012 ranked as 2nd highest on record for WA, continuing a run since April of five consecutive above average months. Mean maximum temperatures were also above average in the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) as August 2012 continued the very warm year to date in the region. All months apart from February have seen above average mean maxima, with the mean maximum for January to August 2012 being 0.9 °C above normal and ranking 3rd warmest since comparable temperature records commenced in 1950. The very much above average year so far is largely due to an above average January, a very much above average autumn (5th warmest), and an above average winter. This run of "warm" temperatures has persisted for almost three years as the Lower West has only recorded two months below the average, in terms of mean maximum temperature, since October 2009.

Relatively warm days were observed in central and southeastern parts of WA on the 6th and 7th in warm northerly winds ahead of a cold front with temperatures in the mid-twenties on the 6th reaching the low thirties on the 7th. A trough near the west coast and a high in the Bight directed warm northeast winds over western parts of the state on the 10th, with temperatures up to 10 °C above normal in inland areas of the Gascoyne and northern SWLD. The warm weather continued over much of western WA on the 11th, away from coastal parts of the Gascoyne and west coast parts of the SWLD with temperatures in the high twenties to low thirties in eastern parts of the SWLD, southwest Gascoyne, and adjacent Goldfields. The focus of the warm weather shifted to the southeast Gascoyne, Goldfields and Southeast Coastal, and adjacent Interior and Eucla on the 12th as a cold front approached the west coast, with temperatures up to 10 °C warmer than normal. A high moving south of WA resulted in warm to hot conditions through northwest and central parts of WA from the 16th through to the 21st, with hot days observed in the west Pilbara and Gascoyne on the 18th, contracting to the Gascoyne and northern Goldfields on the 19th and 20th, and to the Interior and Pilbara on the 21st. Onslow Airport observed its warmest August temperature in 48 years of record on the 18th, with a maximum of 35.2 °C, while Roebourne Aerodrome equalled its highest August temperature in 11 years of record on both the 20th and 21st with maxima of 35.9 °C. A high over southern Australia brought warm to hot conditions to much of WA from the 24th to 26th and the hot conditions slowly contracted to central and northern WA on the 27th and 28th. Fitzroy Crossing recorded the highest temperature in the state for August 2012 with 38.5 °C on the 27th, only slightly below its 42 year August record of 39.0 °C, whilst Telfer Aerodrome recorded a maximum temperatue of 36.0 °C on the 28th, its equal highest August temperature in 39 years of record. Warm conditions returned to western parts of WA away from the west coast with temperatures up to 10 °C warmer than normal in northerly winds ahead of a cold front.

Minimum temperature

Below to very much below mean minimum temperatures were observed across the Kimberley, adjacent Interior, and coastal east Pilbara during August 2012, with areas of lowest on record in the north and west Kimberley where temperatures were up to 5 °C cooler than normal. Wyndham recorded a mean minimum of 15.1 °C, its lowest August mean minimum in 44 years of record. Areas of below average mean minima were also observed in the Southwest and Great Southern, as well as in the eastern Interior and eastern Eucla. In contrast, most of central, western, and southern WA saw above to very much above average overnight temperatures with areas of up to 2 °C warmer than normal in the west Pilbara, Gascoyne, Goldfields, and Interior.

Mean minimum temperatures were near average when averaged across both WA as a whole, and across the Lower Southwest.

Generally clear skies and light winds resulted in a cool morning in the north of the state on the 1st, contrasting with warm overnight temperatures in the Gascoyne, Goldfields, eastern SWLD and western Eucla as cloud extended across the state. Whilst cloudy conditions remained over central parts of WA on the 2nd resulting in warm minima, the cool conditions continued in the north of the state, with Curtin Aerodrome observing a minimum of 6.9 °C and Kununurra Aerodrome observing a minimum of 7.8 °C, their lowest August minimum temperatures in 20 and 26 years of record respectively. Another cold morning was observed in the north of the state on 3rd as Kununurra Aerodrome again broke its lowest minimum temperature record for August with a minimum of 7.3 °C, 0.7 °C cooler than the previous record of 8.0 °C set on 3 August 1990. Further cool mornings were observed in the Kimberley on the 4th and 5th, and 7th to 9th. Curtin Aerodrome equalled its previous lowest August temperature of 8.4 °C on the 8th, though this was above the new low of 6.9 °C observed on the 2nd of the month. A cold morning was experienced in southern parts of WA on the 9th and 10th as a ridge developed in the wake of a cold front and a number of locations registered sub-zero minima. Cloudy conditions and northerly winds resulted in a warm morning in the Goldfields and southeast SWLD on the 12th, while clear skies and light winds resulted in cool mornings returning to the Kimberley from the 12th to 15th. Kununurra Aerodrome equalled its previous August record on the 12th, then broke it for the third time in the month with a minimum of 7.3 °C on the 14th, thus breaking or equalling its previous record on four occasions during August 2012. Curtin Aerodrome also achieved the feat on five occasions during the month. Very cold mornings were observed in southern WA on the 14th and 15th as a ridge extended across the region, with temperatures well below freezing in the southern Goldfields and Eucla on the 14th. Cloudy conditions and a generally northerly flow resulted in a warm morning in parts of western WA on the 21st, with temperatures in the mid-teens in the northern SWLD and adjacent Gascoyne.

WA has observed its equal 3rd coolest January to August period on record due to mean monthly minima being consistently below the average in 2012, and particularly as a result of a very cold May (5th coldest) and the coldest July since comparable records commenced in 1950. In contrast, the Lower Southwest has recorded an above average January to August period in terms of mean minimum temperature.

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Extremes in August 2012
Hottest day 38.5 °C at Fitzroy Crossing Aero on the 27th
Warmest days on average 34.6 °C at Curtin Aero
Coolest days on average 15.8 °C at Rocky Gully
Coldest day 10.7 °C at Rocky Gully on the 22nd
Coldest night -4.0 °C at Eyre on the 9th
Coolest nights on average 2.8 °C at York
Warmest nights on average 21.0 °C at Troughton Island
16.3 °C at Denham
Warmest night 23.9 °C at Troughton Island on the 27th
23.3 °C at Argyle Aero on the 26th
Wettest overall 217.7 mm at Northcliffe
Wettest day 63.0 mm at Leeman on the 1st
Highest wind gust 109 km/h at Munglinup West on the 21st

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 August daily rainfall
Highest daily rainfall
in August 2012 (mm)
Previous wettest
for August
Years of
record
Badgingarra Research Stn 49.0 on the 1st 46.6 on the 21st in 1987 50
Eneabba 47.6 on the 1st 37.7 on the 18th in 2005 47



Record lowest total August rainfall
Total rainfall
for August 2012 (mm)
Previous driest
for August
Years of
record
Average for
August
Eyre 1.9 2.4 in 2006 83 29.5



Record highest August temperature
Highest temperature
in August 2012 (°C)
Previous warmest
for August
Years of
record
Average for
August
Onslow Airport 35.2 on the 18th 34.8 on the 31st in 2006 48 27.1
Telfer Aero 36.0 on the 28th = 36.0 on the 23rd in 1995 39 28.3



Record highest August mean daily maximum temperature
Mean daily maximum
temperature
for August 2012 (°C)
Previous warmest
for August
Years of
record
Average for
August
Roebourne 32.4 31.9 in 1977 92 29.0
Wittenoom 30.7 29.8 in 2006 59 26.7
Mandora 33.3 33.1 in 1998 50 30.7
Onslow Airport 30.5 29.8 in 2006 47 27.1
Emu Creek Station 31.1 30.9 in 2006 39 27.4
Telfer Aero 31.3 31.2 in 2009 38 28.3
Learmonth Airport 29.6 28.5 in 2006 37 26.2



Record lowest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2012 (°C)
Previous coolest
for August
Years of
record
Average for
August
Wyndham 15.1 15.4 in 2002 44 18.9



Summary statistics for August 2012
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2012
Diff
from
average
Highest for
August
2012
Mean for
August
2012
Diff
from
average
Lowest for
August
2012
Total for
August
2012
Average
for
August
Rank of
August
2012
Fraction of
August
average
North Kimberley (district 01)
Kalumburu 33.3 -0.1 37.5 26th 12.6 -2.1 8.4 13th 0.2 0.3 average 67%
Mount Elizabeth 30.9 +0.4 34.7 30th 7.2 -2.4 1.3 13th 0 1.9 lowest 0%
Troughton Island 28.0 -0.8 29.6 26th 21.0 -1.6 18.9 3rd 4.2 0.6 v high 700%
Wyndham 33.4 -0.1 37.2 26th 15.1 -3.8 11.0 3rd 0 0 lowest
Wyndham Aero 34.2 +0.5 38.3 26th 14.2 -2.1 8.9 12th 0 0.1 v low 0%
East Kimberley (district 02)
Argyle Aerodrome 32.5 +0.5 36.5 26th 15.4 -2.0 10.1 1st 0 0.2 v low 0%
Halls Creek Airport 30.5 +0.5 35.1 30th 13.5 -1.3 8.5 2nd 0 1.9 lowest 0%
Kununurra Aero 33.5 +0.9 38.0 26th 11.6 -4.4 7.3 3rd 0 0.1 lowest 0%
Warmun 32.5 +0.2 36.4 26th 12.6 -2.3 6.0 1st 0 1.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 33.3 +2.3 37.1 26th         0 2.1 lowest 0%
Broome Airport 32.0 +1.7 36.6 27th 12.7 -2.2 7.4 3rd 1.6 1.7 high 94%
Curtin Aero 34.6 +1.5 38.4 26th 12.4 -3.6 6.9 2nd 0 1.7 v low 0%
Cygnet Bay 29.9 +0.2 33.7 25th 12.6 -2.2 8.4 1st 0 1.0 lowest 0%
Derby Aero 32.9 +0.3 37.2 31st 12.0 -4.2 8.0 5th 0 0.8 lowest 0%
Fitzroy Crossing Aero 34.0 +0.7 38.5 27th 11.4 -2.5 6.7 2nd 0 1.2 v low 0%
West Roebuck 33.8 +1.5 37.9 26th 12.1 -1.2 6.5 13th 0.4 2.7 average 15%
De Grey (district 04)
Karratha Aero 29.9 +1.8 34.6 20th 14.1 -0.2 9.2 1st 0.6 4.7 average 13%
Mandora 33.3 +2.6 37.5 28th 11.6 -1.7 6.0 14th 0 2.5 lowest 0%
Marble Bar 32.8 +2.8 36.5 28th 11.8 -1.4 6.8 1st 0 0.3 v low 0%
Pardoo Station 31.8 +1.8 36.0 29th 12.1 -1.4 7.6 2nd 0 4.8 lowest 0%
Port Hedland Airport 31.3 +2.2 35.5 28th 12.2 -1.0 8.5 2nd 0.4 4.9 average 8%
Roebourne 32.4 +3.4 36.4 21st 13.6 -0.9 9.4 1st 0 5.0 lowest 0%
Roebourne Aero 31.9 +1.8 35.9 21st 11.7 -1.0 6.4 1st 0.8 1.0 high 80%
Fortescue (district 05)
Barrow Island Airport 26.9 +1.9 30.1 20th 18.0 +0.2 14.3 1st 1.6 3.0 average 53%
Learmonth Airport 29.6 +3.4 33.5 30th 12.2 0.0 9.3 24th 0.2 12.5 low 2%
Mardie 31.5 +2.0 35.3 20th 13.2 +0.8 9.5 1st 0 7.3 lowest 0%
Onslow Airport 30.5 +3.4 35.2 18th 14.8 +1.4 12.0 1st 0.8 9.3 average 9%
Wittenoom 30.7 +4.0 34.4 27th 13.8 +0.6 7.3 1st 0 8.5 lowest 0%
West Gascoyne (district 06)
Carnarvon Airport 24.5 +1.5 28.9 30th 11.3 -0.3 7.4 2nd 7.4 18.0 low 41%
Denham 22.6 +0.2 26.4 30th 16.3 +3.2 14.5 9th 5.6 21.9 low 26%
Emu Creek Station 31.1 +3.7 34.9 11th 12.8 +0.5 10.6 1st 0 11.4 lowest 0%
Murchison 25.7 +2.9 32.5 26th 7.8 +0.9 4.0 9th 5.6 20.1 low 28%
Shark Bay Airport 24.8 +0.9 29.2 12th 11.1 +0.2 6.2 20th 7.2 20.1 v low 36%
East Gascoyne (district 07)
Newman Aero 28.9 +3.1 33.6 28th 9.5 +1.9 2.6 1st 0 7.5 lowest 0%
Paraburdoo Aero 30.5 +3.2 34.7 27th 11.5 +0.7 6.1 1st 0 11.6 lowest 0%
Murchison (district 07A)
Meekatharra Airport 24.9 +3.5 30.5 26th 9.6 +1.1 4.1 3rd 0.2 11.3 v low 2%
Mount Magnet Aero 23.8 +2.9 31.0 26th 9.0 +1.3 3.6 14th 4.0 16.7 low 24%
North Coast (district 08)
Carnamah 21.1 +2.0 26.7 11th 7.6 +0.4 4.0 8th 33.9 52.3 low 65%
Dalwallinu 19.8 +1.9 26.5 11th 6.5 +0.6 2.4 8th        
Geraldton Airport 21.1   26.6 30th 8.6   2.9 25th 53.0
Geraldton Airport Comparison 20.9 +0.8 26.2 30th 8.7 -0.2 3.2 25th 56.2 64.6 average 87%
Kalbarri 23.9 +1.6 28.8 17th 9.4 -0.4 4.9 27th 41.8 49.6 average 84%
Morawa Airport 21.6 +1.6 28.0 11th 6.9 +0.7 2.8 23rd 20.8 31.7 low 66%
Mullewa 22.7 +2.6 30.3 11th 8.5 +1.4 4.9 2nd 20.2 42.0 low 48%
North Island 22.2 +0.9 25.0 31st 15.4 +0.1 9.2 31st 30.4 35.1 average 87%
Wongan Hills 19.8 +2.0 25.9 11th 6.9 +0.3 3.2 23rd 46.2 51.5 average 90%
Central Coast (district 09)
Badgingarra Research Stn 19.0 +0.8 23.1 18th 7.8 +0.8 3.9 23rd 100.0 84.1 high 119%
Bickley 16.8 +0.9 21.6 11th 8.2 +0.8 4.3 9th 173.2 169.6 average 102%
Champion Lakes 19.1   23.5 10th 9.8   4.9 23rd 105.8
Garden Island HSF 18.4 +0.4 20.8 30th 11.3 +0.3 7.5 8th 87.2 88.2 average 99%
Gingin Aero 19.9 +1.0 24.4 11th 6.8 +0.6 1.0 16th 89.6 106.1 low 84%
Gosnells City 20.3 +1.1 25.0 11th 9.1 +0.3 5.1 8th 99.5 125.6 low 79%
Jandakot Aero 19.6 +1.1 24.3 10th 7.1 +0.2 1.4 16th 100.6 124.6 low 81%
Jurien Bay 21.1 +1.3 25.5 30th 9.3 0.0 5.5 9th 90.7 80.2 average 113%
Karnet 17.0 +1.1 22.1 10th 6.3 +0.1 1.1 23rd 184.0 184.7 average 100%
Lancelin 20.7 +1.4 24.5 30th         49.1 90.8 v low 54%
Medina Research Centre 19.8 +1.1 24.5 10th 8.5 +0.5 3.8 9th 94.2 114.2 low 82%
Pearce RAAF 19.8 +1.5 24.3 11th 7.9 -0.2 2.6 9th 81.8 103.9 low 79%
Perth Airport 20.0 +1.5 24.5 11th 8.2 +0.2 2.7 16th 111.4 117.2 average 95%
Perth Metro* 20.1 +1.2 24.5 11th 8.6 +0.5 2.9 9th 87.2 133.4 v low 72%
Rottnest Island 18.7 +1.0 20.8 30th 12.9 +0.6 10.2 8th 93.6 99.3 average 94%
Swanbourne 19.9 +1.2 24.6 10th 10.2 +0.3 5.8 9th 120.0 113.0 average 106%
South Coast (district 09A)
Albany 17.7 +1.4 21.5 18th 9.0 +0.7 4.5 10th 101.4 126.0 average 80%
Albany Airport 17.3   22.0 11th 7.0   0.9 10th 73.4
Albany Airport Comparison 17.1 +1.0 21.9 11th 7.2 -0.3 0.9 10th 63.2 106.2 v low 60%
Bridgetown 17.0 +0.6 21.0 11th 3.7 -1.2 -2.1 10th 101.0 110.8 low 91%
Bunbury 18.1 +0.6 20.9 10th 6.4 -1.1 0.8 10th 84.4 115.7 low 73%
Busselton Aero 17.8 +0.6 20.4 31st 5.5 -1.6 1.0 10th 82.6 103.5 average 80%
Cape Leeuwin 17.6 +1.2 20.8 30th 12.2 +1.0 9.9 13th 95.0 135.9 low 70%
Cape Naturaliste 17.8 +1.4 20.7 19th 11.0 +0.9 8.5 10th 87.6 111.8 low 78%
Collie East 17.7   22.2 10th 3.6   -1.8 10th 87.2 113.0 low 77%
Donnybrook 18.6 +1.4 22.0 11th 5.6 -0.4 2.0 8th 117.6 147.5 average 80%
Dwellingup 17.1 +1.5 22.1 10th 5.5 +0.1 0.6 9th 190.4 192.8 average 99%
Esperance 18.7 +0.8 27.2 26th 9.0 +0.4 4.7 9th 109.8 82.3 high 133%
Esperance Aero 17.8 +0.6 25.5 12th 7.8 +0.1 3.3 9th 66.0 68.1 average 97%
Harvey 18.3 +0.7 21.8 10th 7.0 -0.5 3.0 1st 116.6 130.9 low 89%
Hopetoun North 19.7 +0.8 29.7 11th 8.2 +0.2 3.8 9th 31.8 52.9 low 60%
Mandurah 18.7 +0.9 22.6 10th 11.1 +0.3 7.6 9th 91.6 92.7 average 99%
Manjimup 16.5 +1.5 21.0 11th 6.2 -0.3 3.3 13th 117.8 146.0 average 81%
North Walpole 16.8   20.6 10th 8.4   3.8 10th
Pemberton 16.8 +1.3 21.0 11th 6.9 -0.1 2.3 10th 149.9 168.3 average 89%
Rocky Gully 15.8 +0.5 20.4 11th 6.2 -0.6 3.1 13th 98.2 90.5 average 109%
Windy Harbour 17.4 +0.5 21.1 30th 8.9 -0.1 4.3 11th 160.9 161.8 average 99%
Witchcliffe 17.4 +0.8 21.3 11th 7.2 -0.9 1.3 10th 169.0 145.2 average 116%
North Central (district 10)
Bencubbin 19.8 +2.2 28.4 11th 7.0 +1.2 1.6 23rd 22.8 37.1 low 61%
Cunderdin Airfield 19.6 +1.9 25.9 31st 4.5 +0.3 -0.2 23rd 35.8 40.0 low 90%
Kellerberrin 19.1 +1.5 27.0 11th 4.9 -0.5 -0.1 9th 38.4 41.0 average 94%
Merredin 19.8 +2.5 28.4 11th 6.4 +1.0 0.4 8th 25.8 38.7 average 67%
Northam 19.4 +1.5 24.6 11th 5.2 -0.4 -0.2 9th 48.3 60.6 average 80%
York 19.4 +1.6 24.0 11th 2.8 -1.1 -1.4 9th 34.3 55.5 low 62%
South Central (district 10A)
Beverley 19.2 +1.5 24.2 31st 4.3 -0.7 -0.6 9th 35.6 58.5 low 61%
Brookton 18.3 +1.6 23.3 11th 3.9 -0.7 0.0 2nd 48.2 61.9 average 78%
Corrigin 18.2 +1.9 25.8 31st 4.3 -0.4 -1.3 9th 30.5 47.2 low 65%
Hyden 19.5 +2.1 28.7 11th 4.4 -0.2 0.0 8th 28.1 40.5 average 69%
Jacup 17.9 +1.3 26.0 31st 5.5 -0.1 2.2 5th 54.6 47.3 average 115%
Katanning 16.3 +1.0 22.3 11th 5.3 -0.5 1.7 5th 48.2 59.9 low 80%
Lake Grace 17.9 +1.3 26.0 31st 5.3 -0.1 0.5 5th 27.2 34.0 average 80%
Narembeen 19.5 +1.9 27.7 11th 5.9 +0.7 0.0 23rd 36.6 41.4 average 88%
Narrogin 17.2 +1.9 22.6 31st 4.8 -0.3 -0.3 9th 45.2 67.6 low 67%
Newdegate Research Station 17.6 +1.5 26.2 31st 4.1 0.0 -1.5 5th 27.6 43.4 low 64%
Ongerup 17.2 +1.5 25.1 11th 5.6 -0.2 1.0 5th 31.8 42.7 low 74%
Pingelly 18.0 +2.0 23.0 11th 5.0 -0.6 0.6 9th 35.4 61.8 low 57%
Ravensthorpe 18.7 +1.5 28.3 11th 7.0 +0.3 3.2 9th 32.2 44.4 average 73%
Wagin 17.3 +1.3 23.2 11th 4.9 -0.7 -0.3 10th 31.0 56.8 low 55%
Wandering 17.3 +1.0 22.9 11th 3.9 -0.4 -1.4 9th 74.8 89.0 low 84%
Eucla (district 11)
Balladonia 20.7 +1.5 28.2 12th 5.9 +0.6 -1.4 14th 10.7 21.2 low 50%
Eucla 20.7 +1.6 29.7 27th 7.1 -0.4 3.0 15th 3.0 26.2 v low 11%
Eyre 21.1 +1.8 28.6 12th 3.9 -2.2 -4.0 9th 1.9 29.5 lowest 6%
Forrest 22.1 +1.3 31.5 27th 4.5 -1.3 -0.4 14th 0 14.8 v low 0%
Red Rocks Point 20.6   28.5 31st 7.4   3.7 9th 16.0
South East (district 12)
Bulga Downs 24.0   31.6 12th 6.1   1.0 23rd 9.7 15.3 average 63%
Kalgoorlie-Boulder Airport 20.7 +2.1 27.4 12th 6.9 +1.3 -1.1 14th 3.8 21.0 v low 18%
Laverton Aero 22.9 +2.4 30.5 27th 8.3 +1.2 2.3 23rd 0.8 9.2 low 9%
Leinster Aero 23.4 +2.0 30.0 27th 8.2 +0.7 3.9 15th 0.8 9.4 low 9%
Leonora 23.0 +2.4 29.6 12th 7.8 +0.8 2.3 14th 9.6 16.0 average 60%
Leonora Aero 23.1   30.3 12th 7.5   1.8 14th 8.2
Munglinup West 18.5 +0.6 27.4 11th 6.9 +0.2 2.8 8th 36.6 37.1 average 99%
Norseman Aero 20.2 +0.9 27.5 26th 4.8 +0.7 -3.6 14th 10.6 20.9 v low 51%
Salmon Gums Res.Stn. 19.5 +2.2 27.8 12th 4.8 +0.2 -3.3 9th 14.0 33.0 v low 42%
Southern Cross Airfield 20.1 +1.8 28.9 11th 4.4 +1.1 -1.8 16th 16.6 28.2 low 59%
Yeelirrie 24.4 +2.8 31.0 27th 5.0 +0.3 -0.3 3rd 0 12.7 lowest 0%
North East (district 13)
Carnegie 26.9 +3.0 33.4 27th 8.2 +1.1 2.6 6th 0 7.4 lowest 0%
Giles Meteorological Office 25.4 +2.8 32.5 28th 8.9 +0.2 5.0 17th 0 10.2 lowest 0%
Telfer Aero 31.3 +3.0 36.0 28th 12.9 +0.4 5.1 1st 0 5.4 lowest 0%
Warburton Airfield 25.8 +2.7 33.8 28th 6.9 -0.2 1.5 1st 0 9.8 lowest 0%
Wiluna 25.2 +3.4 31.5 27th 8.1 +1.3 2.7 3rd 0.8 10.2 low 8%
Offshore Islands (district 200)
Varanus Island 26.4 +1.1 28.0 5th 20.4 +0.4 18.5 1st 0.8 0.8 high 100%

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 9 am on Monday 3 September 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.

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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