Tuesday, 4 January 2011 - Annual Climate Summary for Western Australia - Product code IDCKGC21R0
Western Australia in 2010: A very dry year in southwest Western Australia
- Rainfall: Near average for WA as a whole; driest year on record for southwest WA.
- Maximum temperature: Ninth warmest on record for WA; second warmest for southwest WA.
- Minimum temperature: Third warmest for WA; near average for southwest WA.
Annual: Annual rainfall in 2010 in WA was above average to very much above average in parts of the Kimberley, northern and eastern Interior and eastern Eucla. Eucla in the southeast of the state recorded its wettest year in 121 years of record. The rainfall was associated with tropical weather systems, with persistent cloud bands that brought significant rain through the dry season to northern and eastern WA. Also, after a very dry year, parts of the Gascoyne region received record rainfall in December to register very much above average rainfall for 2010.
In marked contrast, the Southwest Land Division (SWLD) and adjacent parts of neighbouring districts recorded below average rainfall. Averaged across the SWLD it was the driest year since comparable records commenced in 1900, whilst the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) also experienced its driest year on record by a significant margin, the driest southern wet season (April to October), driest winter (June to August), and driest spring (September to November). Many sites in the Southwest, Lower West, Great Southern and Central Wheat Belt observed approximately half, or less, of the normal average annual rainfall, and the driest year on record.
The statewide annual mean total was 334 mm, which is close to the average of 341 mm.
January: Rainfall during January 2010 over WA was close to the long-term mean. A tropical low that moved south near the WA/NT border at the beginning of the month brought above average rainfall to eastern parts of the state, whilst Tropical Cyclone Magda toward the end of the month brought heavy falls to the west Kimberley. Persistent strong high pressure systems to the south of the state prevented any meaningful rainfall for large parts of western and inland WA in January. In particular, there was a weaker than normal level of thunderstorm activity near the SWLD west coast and many stations in this region recorded no rainfall for the month.
February: Rainfall for February 2010 was below average with an unusually quiet monsoon season and no tropical cyclones in the WA region. This lack of monsoonal activity also had an effect on the remainder of the state, with few opportunities for tropical moisture to venture into western parts resulting in below average rainfall conditions in west coast districts. Severe thunderstorms causing damage and heavy rainfall in the south of the SWLD on the 9th led to small pockets of above average rainfall.
Autumn: Below average rainfall continued in the SWLD, as well as in the Pilbara and large parts of the Gascoyne in autumn. The first significant rainfall for the year for many locations in the southern Gascoyne and western SWLD came on 21 and 22 March 2010 as low level convergence into a surface trough combined with a mid-level trough off the WA west coast to generate showers and storms in the region. Severe thunderstorms occurred in Perth and southwest WA on the afternoon of 22 March and caused significant damage, being considered as one of the worst storms in Perth's history. For more details of the severe thunderstorms in Perth, see notable events below.
Winter: Averaged over the state as a whole, rainfall during winter 2010 was near average; however, for the Lower Southwest, very dry conditions that had been present for much of the year continued and the region posted its driest winter since comparable records commenced in 1900 as a result of the third driest June on record, a below average July, and the sixth driest August on record. The SWLD recorded its 2nd driest winter on record, only eclipsed by the drier winter of 2006. In contrast, above to very much above average winter rainfall was recorded over most of the Kimberley and adjacent Pilbara and Interior, the result of above average July and August rainfall. Cloudbands in mid-June and early July produced unusually heavy falls in the Pilbara and Kimberley with several daily winter rainfall records broken.
Spring: WA observed its 5th highest spring rainfall as a result of above average rainfall over most of WA, apart from the SWLD. Above average September and October rainfall with significant cloudbands in September, as well as thunderstorm activity through the spring months, contributed to the very much above average spring rainfall to much of WA. In stark contrast, the SWLD continued to experience a very dry year with very much below average rainfall across most of the region. The Lower Southwest recorded its driest spring on record, and the SWLD its 5th driest spring on record.
December: Most of western WA recorded above average rainfall during December as a result of an early monsoon onset, and the passage of a tropical low near the WA west coast during the middle of the month. The low brought falls of over 300 mm to parts of the west Gascoyne region, resulting in significant flooding in the Gascoyne River and inundation of parts of Carnarvon.
Annual: Maximum temperatures in WA during 2010 were above average to very much above average for the western half of the state, with areas of hottest on record in western parts of the SWLD, including Perth, as well as in the west Kimberley. In contrast, eastern parts of the Kimberley and Interior were below average in terms of daytime maximum temperatures. Averaged across the state as a whole, the annual mean maximum temperature was 0.70 °C above the 1961/90 average, and the 9th warmest year since records commenced in 1910. The Lower Southwest observed its 2nd warmest year on record, 1.23 °C above the 1961/90 mean. The west Pilbara experienced a very hot start to the year with Onslow recording a maximum temperature of 49.2 °C on 1 January 2010, the highest temperature recorded in WA in 2010 and an equal record highest temperature at Onslow.
January: Very hot daytime temperatures were observed over much of the state during January 2010. Several daily maximum temperature records for January were broken or equalled in the Pilbara on the first two days of the month, with maxima near to or exceeding 49 °C. In the south, a near stationary trough off the west coast on 6 January combined with a high in the Bight to direct hot northeasterly winds over the SWLD with several sites in eastern parts of the SWLD having their hottest day on record. Hopetoun North, in the Southeast Coastal district, recorded a maximum temperature of 48.0 °C. The event was marked by "catastrophic" high fire danger ratings in the region and a notable number of heat related bird deaths.
February: Above average to very much above average temperatures continued in much of WA during February 2010, with the daytime maximum for the state ranking as the 4th hottest for February. Inland parts of WA generally saw the greatest departures from normal, with little cloud or rainfall to moderate temperatures during the month.
Autumn: Above average to very much above average mean maximum temperatures were recorded in almost all of WA in autumn 2010, and the season ranked as the 6th hottest on record.
Winter: Winter mean maximum temperatures were near average over much of central and southern WA, however, above average to very much above average mean maximum temperatures occurred in the north and west Kimberley, the Pilbara, north and west Gascoyne, and western parts of the SWLD, with Roebourne and Onslow in the Pilbara experiencing their warmest winter on record.
Spring: Spring mean maximum temperatures were above average to very much above average over western WA, with the Lower Southwest observing its warmest spring on record. In contrast, mean maximum temperatures for spring 2010 were below average to very much below average over eastern and central WA, with Giles and Balgo Hills in the Interior experiencing their coolest spring maximum temperatures on record.
December: Mean maximum temperatures were near average across the WA as a whole, however the Lower Southwest experienced many hot and humid days in the second half of the month.
Annual: Minimum temperatures in 2010 in WA were above average to very much above average in most of the state and sites in the west Kimberley, Pilbara and north Gascoyne observed their highest annual mean minimum temperatures on record. In contrast, most of the SWLD, as well as parts of the eastern Interior and southeast Kimberley recorded near average overnight minima in 2010. Averaged across the state as a whole, the annual mean minimum temperature was 0.74 °C, well above the 1961/90 average and the 3rd warmest since comparable records commenced in 1910.
January: Above average overnight temperatures were observed over most of the state during January 2010, particularly in central and southern parts. Balladonia, in the Eucla district, recorded its highest overnight temperature in 46 years of record with 27.8 °C on the 10th.
February: Above to very much above average minimum temperatures continued for much of WA in February 2010. Inland parts of WA generally saw the greatest departures from normal, with pockets of record high mean minimum temperatures.
Autumn: Mean minimum temperatures were above to very much above average through much of WA away from the west coast, and the season ranked as 4th warmest on record averaged across WA as a whole.
Winter: When averaged over the whole state, winter 2010 was above average, with northern and central parts reporting above average mean minima, however most of the SWLD, southern Gascoyne and southern Goldfields experienced abnormally cold minima as a result of low cloudiness and low rainfall. Several sites in the SWLD and Goldfields registered their lowest winter temperature on record in late June or early July. Eyre recorded a minimum temperature of -6.8 °C on 11 August 2010, the second lowest temperature recorded in WA (the record is -7.2 °C recorded at Eyre on 17 August 2008). In contrast, Mardie and Onslow Airport on the west Pilbara coast recorded their warmest winter on record in terms of mean overnight temperatures.
Spring: Above average mean minima were recorded in much of the west Kimberley, Pilbara, Gascoyne, and northern SWLD in spring, whilst below average minima were recorded near the WA south coast and in the northeast Interior and southeast Kimberley. Averaged across the state, a near average mean minimum temperature was recorded in spring.
December: Above average mean minimum temperatures were reported across much of WA in December, whilst only in the Kimberley were large areas of below average mean minima reported. As a result the WA mean minimum for December was above average.
- Summer 2009/10 was particularly hot for WA with the summer mean temperature (average of maximum and minimum) being the highest on record. All months during the summer were abnormally hot with the third hottest December, second hottest January, and third hottest February recorded.
- The 2009/10 Tropical Cyclone Season in the north of WA was notable for a lack of tropical cyclones. No tropical cyclones were recorded in the WA region in February or March. However, two coastal crossings did occur during the tropical cyclone season, with TC Laurence (late December 2009) and TC Magda (January 2010) crossing the Kimberley coast as severe tropical cyclones. The west Pilbara and Gascoyne region received no tropical cyclone activity during the season.
- Severe storms affected southern WA on 21 and 22 March. Storms that swept through the Perth metropolitan area and southwest WA on the afternoon of 22 March, were considered to be some of the worst in Perth's history with over $1 billion in damage caused mainly by large hail (up to 6 cm) and flash flooding. The storms brought the first significant rainfall to Perth after a long dry spell that commenced on 20 November 2009 and included Perth's driest summer since records commenced in 1876.
- The Kimberley and northern Interior recorded an exceptionally wet "dry season" (May to October), with several sites reporting their highest seasonal rainfall on record.
- An extraordinarily dry year occurred in southwest WA with a very low number of cold frontal systems moving through the region during autumn, winter and spring. The Lower Southwest recorded a below average autumn, the driest winter and the driest spring since comparable records commenced in 1900, and this culminated in the driest year on record for the region by some margin.
- A significant tropical depression brought over 300 mm to western parts of the Gascoyne district in mid-December, and caused major flooding in the Gascoyne River and in Carnarvon. Many daily and monthly rainfall records were broken as a result. Carnarvon registered its wettest month since records commenced in the town in 1883, with a December total of 255.0 mm observed at Carnarvon Airport, and a daily total of 207.8 mm in the 24 hours to 9am on 17 December.
|Extremes in 2010|
|Hottest day||49.2 °C at Onslow on 1 Jan|
|Warmest days on average||36.2 °C at Fitzroy Crossing Aero|
|Coolest days on average||19.8 °C at Albany|
|Coldest day||9.0 °C at Mount Barker on 18 Aug|
|Coldest night||-6.8 °C at Eyre on 11 Aug|
|Coolest nights on average||7.9 °C at Jarrahwood|
|Warmest nights on average||
26.5 °C at Troughton Island
23.9 °C at Truscott (mainland)
|Warmest night||34.6 °C at Paraburdoo Aero on 2 Jan|
|Wettest overall||1620.9 mm at Theda (Kimberley)|
|Driest overall||72.8 mm at Mardie|
|Wettest day||215.6 mm at Cape Leveque on 19 May|
|Highest wind gust||128 km/h at Cunderdin Airfield on 22 Mar|
|Record highest annual daily rainfall|
Highest daily rainfall
in 2010 (mm)
|Twin Peaks||163.0||on 18 Dec||150.0||on 22 Feb 1975||102|
|Marron||166.4||on 17 Dec||132.4||on 9 Mar 2000||99|
|Yaringa Station||179.0||on 17 Dec||175.0||on 9 Mar 2000||85|
|Carnarvon Airport||207.8||on 17 Dec||102.6||on 13 Jul 1998||66|
|Alexandra Bridge||82.0||on 27 May||78.0||on 27 Jan 1974||40|
|Record highest total annual rainfall|
for 2010 (mm)
|Record lowest total annual rainfall|
for 2010 (mm)
|Bridgetown Comparison||399.9||510.1||in 1940||122||823.8|
|Lake Grace Comparison||155.6||187.0||in 2009||98||350.2|
|Cherry Tree||264.6||277.6||in 1940||82||458.6|
|Holt Rock||147.8||164.0||in 2002||82||328.3|
|Graham Rock||140.2||174.7||in 1972||74||340.7|
|Wongan Hills Res.Station||195.8||214.3||in 1972||72||354.6|
|Amrista Park||143.9||208.7||in 1972||53||354.8|
|Gordon River||309.3||355.8||in 1972||50||529.1|
|Pearce RAAF||347.2||458.8||in 1969||42||658.5|
|Gosnells City||499.6||553.1||in 2006||41||830.5|
|Ferguson Valley||527.2||629.4||in 2006||34||898.2|
|Jandakot Aero||495.8||509.8||in 2006||33||829.0|
|Record highest annual temperature|
| Highest temperature
in 2010 (°C)
| Previous annual
|Esperance||46.9||on 6 Jan||46.7||on 1 Feb 1991||42||21.8|
|Learmonth Airport||48.9||on 2 Jan||48.2||on 21 Jan 2003||36||31.8|
|Record lowest annual daily maximum temperature|
Lowest daily maximum
in 2010 (°C)
|Telfer Aero||13.1||on 5 Jul||13.6||on 9 Jul 1986||37||34.1|
|Record highest annual mean daily maximum temperature|
| Mean daily maximum
for 2010 (°C)
| Previous annual
|Perth Airport||26.0||25.6||in 1999||65||24.4|
|Wongan Hills||26.9||26.8||in 1994||39||25.6|
|Record highest annual daily minimum temperature|
Highest daily minimum
in 2010 (°C)
|Balladonia||27.8||on 10 Jan||27.1||on 30 Dec 2009||46||9.8|
|Record lowest annual temperature|
in 2010 (°C)
|Geraldton Airport||-0.4||on 4 Jul||0.5||on 26 Jun 1973||70||13.6|
|Norseman||-4.6||on 27 Jun||-3.1||on 21 Jul 1988||54||10.5|
|Narembeen||-3.2||on 3 Jul||-2.5||on 2 Jul 1982||44||10.6|
|Pingelly||-2.5||on 3 Jul||-1.6||on 22 Sep 2008||40||10.4|
|Record highest annual mean daily minimum temperature|
| Mean daily minimum
for 2010 (°C)
| Previous annual
|Broome Airport||23.0||22.8||in 1959||70||21.2|
|Port Hedland Airport||21.3||21.0||in 1998||61||19.4|
|Onslow Airport||20.1||20.0||in 2004||41||18.9|
|Emu Creek Station||19.4||19.0||in 1998||36||18.2|
|Gascoyne Junction||18.0||17.7||in 1996||31||16.8|
|Summary statistics for 2010|
|North Kimberley (district 01)|
|Kalumburu||34.0||-0.3||38.8||6 Apr||21.7||+1.4||9.9||13 Aug||1322.8||1163.5||high||114%|
|Troughton Island||31.7||+0.7||35.1||26 Nov||26.5||+1.2||21.3||2 Aug||784.7|
|Truscott||32.7||38.0||21 Nov||23.9||15.8||13 Aug|
|Wyndham||35.4||-0.2||41.8||7 Dec||23.8||+0.6||14.0||13 Aug||1017.2||814.1||high||125%|
|Wyndham Aero||35.7||42.6||7 Dec||23.5||12.0||5 Jun||893.6||816.5||high||109%|
|East Kimberley (district 02)|
|Argyle Aerodrome||34.3||-0.4||42.1||24 Nov||22.8||+0.6||13.1||7 Aug||886.6||767.9||high||115%|
|Halls Creek Airport||33.0||-0.6||42.2||1 Jan||20.7||+0.7||10.1||2 Jul||750.4||559.4||high||134%|
|Kununurra Aero||34.3||-0.6||42.4||22 Nov||21.9||+0.6||11.0||14 Aug||994.4||812.5||high||122%|
|West Kimberley (district 03)|
|Bidyadanga||34.2||+0.9||43.0||25 Mar||11.0||7 Aug||375.0||508.3||low||74%|
|Broome Airport||33.0||+0.8||40.7||9 Mar||23.0||+1.8||10.9||24 Jun||543.0||602.9||average||90%|
|Curtin Aero||35.7||+0.2||42.7||23 Nov||22.1||+1.1||12.4||16 Aug||816.5|
|Derby Aero||34.8||+0.3||42.2||17 Nov||22.7||+1.2||12.6||21 Jun||817.8||681.3||high||120%|
|Fitzroy Crossing Aero||36.2||+0.2||44.9||24 Nov||21.1||+1.0||8.4||8 Aug||717.4||699.2||average||103%|
|West Roebuck||34.5||42.7||28 Sep||21.7||8.8||10 Aug||576.0||848.6||low||68%|
|De Grey (district 04)|
|Karratha Aero||32.9||+0.6||42.3||23 Mar||21.8||+1.1||10.6||11 Jul||95.4||282.4||v low||34%|
|Port Hedland Airport||34.0||+0.8||45.5||2 Jan||21.3||+1.9||9.2||11 Aug||125.6||309.8||low||41%|
|Roebourne||35.7||+1.7||47.2||16 Feb||21.2||+0.7||11.1||10 Jul||93.9||310.6||v low||30%|
|Roebourne Aero||35.2||46.4||16 Feb||20.8||8.6||11 Aug||145.6|
|Fortescue (district 05)|
|Barrow Island Airport||29.4||+0.3||40.0||2 Jan||22.5||+0.4||14.7||14 Jul||95.4||271.6||v low||35%|
|Learmonth Airport||32.7||+0.9||48.9||2 Jan||18.3||+0.6||6.1||25 Jul||266.2||250.6||average||106%|
|Mardie||34.1||+0.2||49.0||1 Jan||20.2||+1.5||8.4||11 Jul||72.8||271.1||v low||27%|
|Onslow||31.8||+0.5||49.2||1 Jan||20.4||+2.4||10.6||11 Jul||84.0||270.1||low||31%|
|Onslow Airport||32.7||+0.8||48.8||1 Jan||20.1||+1.2||10.3||11 Jul||80.4||318.2||v low||25%|
|Wittenoom||34.1||+1.2||46.5||1 Jan||20.8||+1.1||6.3||14 Jul||281.1||457.6||low||61%|
|West Gascoyne (district 06)|
|Carnarvon Airport||27.8||+0.6||44.2||11 Dec||17.4||+0.2||4.5||2 Jul||367.6||228.7||v high||159%|
|Denham||43.1||28 Feb||18.7||+1.2||8.6||28 Jun||231.0||223.8||average||103%|
|Emu Creek Station||34.8||+1.1||49.1||2 Jan||19.4||+1.2||7.5||10 Jul||198.0||299.1||average||66%|
|Gascoyne Junction||33.2||+1.1||47.6||27 Dec||18.0||+1.2||3.7||7 Jul|
|Shark Bay Airport||29.4||46.7||18 Jan||16.7||2.8||7 Jul||260.2||192.7||high||135%|
|East Gascoyne (district 07)|
|Newman Aero||32.7||+0.8||45.5||21 Feb||17.7||+1.7||0.9||2 Jul||216.4||319.3||low||68%|
|Paraburdoo Aero||34.6||+1.2||47.4||21 Feb||19.7||+1.8||4.5||25 Jul||135.0||316.6||v low||43%|
|Murchison (district 07A)|
|Meekatharra Airport||30.2||+1.3||44.9||31 Dec||16.7||+0.8||2.4||2 Jul||181.8||236.1||average||77%|
|Mount Magnet Aero||28.9||+0.5||45.4||31 Dec||15.8||+0.8||0.5||28 Jun||297.0||252.6||high||118%|
|North Coast (district 08)|
|Dalwallinu||26.9||+0.7||44.6||5 Jan||11.5||-0.1||-0.2||4 Jul||283.4||285.8||average||99%|
|Dalwallinu Comparison||27.0||+1.0||44.4||5 Jan||12.3||+0.1||-0.3||26 Jun||286.8||356.8||low||80%|
|Geraldton Airport||26.9||+1.0||45.8||18 Jan||13.2||-0.4||-0.4||4 Jul||301.6||443.6||v low||68%|
|Kalbarri||28.7||+1.1||45.4||18 Jan||14.7||+0.2||1.2||28 Jun||260.2||350.8||low||74%|
|Mullewa||29.1||+1.3||46.2||19 Jan||14.0||+0.9||1.9||2 Jul||338.3||333.9||average||101%|
|North Island||25.1||36.8||28 Feb||18.7||10.5||26 May||221.4|
|Wongan Hills||26.9||+1.3||44.7||19 Jan||11.8||-0.1||-0.8||25 Jun||223.3||387.7||v low||58%|
|Central Coast (district 09)|
|Bickley||23.4||+1.0||41.8||18 Jan||11.4||+0.3||2.4||25 Jun||572.8||1076.8||lowest||53%|
|Champion Lakes||25.1||41.5||17 Jan||13.6||2.7||4 Jul||446.2|
|Garden Island HSF||23.1||40.4||17 Jan||14.5||5.8||25 Jun||407.6|
|Gingin Aero||26.3||+1.0||44.3||18 Jan||10.2||-0.6||-3.7||5 Jul||421.8||630.0||v low||67%|
|Gosnells City||26.5||+1.2||43.8||17 Jan||0.5||26 Jun||499.6||830.5||lowest||60%|
|Jandakot Aero||25.7||+1.4||43.0||18 Jan||10.8||-0.5||-2.5||26 Jun||495.8||829.0||lowest||60%|
|Karnet||23.6||+1.1||40.2||18 Jan||-1.0||25 Jun||596.3||1170.8||lowest||51%|
|Lancelin||25.3||+1.3||44.5||26 Feb||2.5||27 Jun||342.0||603.2||lowest||57%|
|Medina Research Centre||25.5||+1.3||43.8||17 Jan||12.1||-0.1||0.0||26 Jun||487.1||762.6||v low||64%|
|Pearce RAAF||26.3||+1.2||44.2||18 Jan||11.6||-0.6||-1.9||4 Jul||347.2||658.5||lowest||53%|
|Perth Airport||26.0||+1.6||43.2||18 Jan||11.9||-0.2||-1.0||3 Jul||483.2||774.2||v low||62%|
|Perth Metro||25.3||+0.8||42.9||17 Jan||12.3||-0.3||-0.6||26 Jun||503.8||852.6||v low||59%|
|Rottnest Island||22.4||+0.4||41.1||17 Jan||15.7||+0.1||7.9||10 Jul||476.2||563.2||low||85%|
|Swanbourne||24.9||+1.1||42.9||17 Jan||13.5||-0.3||2.9||25 Jun||584.4||720.0||v low||81%|
|South Coast (district 09A)|
|Albany||19.8||+0.3||38.9||18 Jan||12.7||+1.1||5.5||10 Jun||742.2||929.7||v low||80%|
|Albany Airport||20.5||+0.3||40.7||18 Jan||10.4||-0.1||0.9||10 Jun||674.6||794.4||low||85%|
|Bridgetown Comparison||23.7||+1.3||41.0||18 Jan||8.4||+0.4||-2.6||10 Jun||399.9||823.8||lowest||49%|
|Bunbury||23.8||+0.9||40.6||17 Jan||10.4||-0.5||-0.3||3 Jul||484.4||724.8||v low||67%|
|Busselton||23.3||+0.6||37.5||17 Jan||10.8||-0.5||1.5||3 Jul|
|Busselton Aero||23.6||+0.7||39.4||17 Jan||9.4||-0.8||-0.1||10 Jun||435.6||704.3||v low||62%|
|Cape Leeuwin||20.6||+0.9||38.3||12 Mar||14.7||+0.6||6.9||10 Aug||625.0||970.0||v low||64%|
|Cape Naturaliste||22.0||+1.4||37.8||17 Jan||12.9||+0.2||5.9||24 Jun||574.0||812.1||v low||71%|
|Collie East||24.3||40.4||18 Jan||8.1||-3.0||11 Jun||390.0|
|Donnybrook||24.5||+1.4||41.5||17 Jan||10.3||+0.6||0.0||3 Jul||511.3||975.9||lowest||52%|
|Dwellingup||23.6||+1.9||40.4||18 Jan||9.3||-0.2||-2.0||25 Jun||589.7||1245.2||lowest||47%|
|Esperance||22.4||+0.6||46.9||6 Jan||12.2||+0.2||4.2||26 Jun||494.8||615.6||low||80%|
|Esperance Aero||22.5||+0.5||46.4||6 Jan||11.2||0.0||3.5||3 Jul||532.6||564.6||average||94%|
|Harvey||24.6||41.2||17 Jan||11.1||1.0||30 Jun||481.2||834.9||v low||58%|
|Hopetoun North||21.8||-0.4||48.0||6 Jan||11.6||+0.2||3.4||11 Jun||461.6||487.9||low||95%|
|Jarrahwood||23.7||+1.4||40.5||17 Jan||7.9||-0.7||-3.2||10 Jun||526.8||929.5||lowest||57%|
|Mandurah||23.9||40.1||25 Dec||14.4||4.9||25 Jun||451.4|
|Manjimup||21.7||+1.4||40.8||18 Jan||9.7||+0.1||2.0||3 Jul||549.0||1006.6||lowest||55%|
|North Walpole||20.5||38.5||12 Mar||11.6||3.7||11 Jun|
|Pemberton||21.6||+1.4||38.9||17 Jan||10.3||+0.2||2.6||11 Jun||669.1||1191.4||lowest||56%|
|Rocky Gully||21.2||+0.5||39.7||6 Jan||9.3||-0.3||1.4||25 Jun||475.2||683.5||v low||70%|
|Shannon||20.7||+0.3||38.5||18 Jan||9.5||-0.1||1.8||9 Aug||520.6||1021.7||v low||51%|
|Witchcliffe||21.9||+0.8||39.3||17 Jan||10.1||-0.5||-0.7||10 Jun||857.2||935.5||average||92%|
|North Central (district 10)|
|Cunderdin Airfield||26.8||+1.1||46.0||19 Jan||9.9||-0.4||-3.7||5 Jul||167.2||300.5||v low||56%|
|Merredin||26.5||+1.6||45.2||6 Jan||11.4||+0.1||-2.5||27 Jun||179.4||325.2||v low||55%|
|Northam||26.8||+1.5||44.5||18 Jan||10.2||-0.7||-3.5||26 Jun||232.6||428.6||v low||54%|
|York||26.5||+1.2||44.5||18 Jan||8.7||-0.8||-4.2||7 Jul||221.2||378.2||v low||58%|
|South Central (district 10A)|
|Brookton||25.1||+0.9||42.7||18 Jan||-2.9||26 Jun||256.4||451.8||v low||57%|
|Corrigin||25.1||+1.4||43.5||9 Jan||9.8||-0.1||-4.0||26 Jun||166.5||372.9||lowest||45%|
|Hyden||26.5||+1.5||47.0||9 Jan||9.7||-0.2||-4.0||25 Jun||142.1||338.6||lowest||42%|
|Jacup||22.4||+0.6||46.1||6 Jan||0.8||23 Aug||364.6||455.5||low||80%|
|Katanning||22.9||+0.6||42.4||18 Jan||9.2||-0.2||-0.2||25 Jun|
|Katanning Comparison||23.3||+1.2||42.2||18 Jan||9.0||-0.3||-2.4||11 Jun||287.9||477.7||v low||60%|
|Lake Grace||24.0||+0.6||44.4||6 Jan||9.9||-0.3||-1.3||23 Aug||170.6||325.1||v low||52%|
|Lake Grace Comparison||24.1||+0.8||43.8||6 Jan||10.2||0.0||-1.3||23 Aug||155.6||350.2||lowest||44%|
|Narembeen||26.4||+1.3||45.3||9 Jan||10.5||-0.1||-3.2||3 Jul||180.4||330.7||v low||55%|
|Narrogin||23.7||+1.4||42.2||18 Jan||9.4||0.0||-1.6||25 Jun||291.3||495.0||v low||59%|
|Newdegate Research Station||24.0||+0.8||45.7||6 Jan||8.2||-0.5||-2.4||10 Sep|
|Ongerup||22.5||+0.8||43.0||18 Jan||9.5||-0.2||-0.4||25 Jun||293.6||384.8||low||76%|
|Pingelly||24.6||+1.4||42.6||18 Jan||10.2||-0.2||-2.5||3 Jul||287.2||445.9||v low||64%|
|Wagin||23.9||+1.0||43.1||18 Jan||9.3||-0.4||-1.2||11 Jun||246.8||433.4||v low||57%|
|Wandering||24.6||+1.0||43.6||18 Jan||-2.9||11 Jun||277.4||488.9||v low||57%|
|Eucla (district 11)|
|Balladonia||25.1||+0.5||45.6||19 Feb||10.1||+0.3||-2.3||26 Jun||227.0||261.9||average||87%|
|Eucla||22.8||0.0||43.6||7 Feb||12.3||+0.1||1.8||5 Jul||448.8||271.3||highest||165%|
|Eyre||23.6||+0.8||45.6||7 Jan||9.8||-1.0||-6.8||11 Aug||262.4||306.8||low||86%|
|Forrest||25.4||-0.8||44.4||29 Dec||11.1||+0.2||0.0||11 Aug||276.2||241.8||average||114%|
|Red Rocks Point||21.9||44.1||7 Jan||12.9||2.1||11 Aug||315.2|
|South East (district 12)|
|Bulga Downs||29.5||46.5||15 Feb||14.0||-1.7||2 Jul||243.4||229.5||average||106%|
|Kalgoorlie-Boulder Airport||25.9||+0.6||45.0||20 Jan||12.4||+0.7||-1.6||27 Jun||165.6||262.7||low||63%|
|Laverton Aero||27.2||+0.4||44.1||20 Jan||14.6||+0.8||-0.3||4 Jul||243.2||280.6||average||87%|
|Leinster Aero||28.4||+0.3||44.8||20 Jan||15.0||+0.4||-0.5||2 Jul||258.0||260.7||average||99%|
|Leonora||28.1||+0.2||46.5||20 Jan||14.5||+0.6||0.5||28 Jun||220.2||234.0||average||94%|
|Leonora Aero||28.0||45.5||20 Jan||14.8||-0.9||2 Jul||192.6|
|Munglinup West||23.0||47.6||6 Jan||10.4||2.0||3 Jul|
|Norseman Aero||25.4||+0.4||44.8||6 Jan||9.6||-0.2||-6.0||27 Jun||183.4||294.0||v low||62%|
|Southern Cross Airfield||26.4||+0.6||45.7||6 Jan||10.3||+0.2||-4.2||27 Jun||151.4||303.6||v low||50%|
|North East (district 13)|
|Giles Meteorological Office||28.8||-0.5||42.5||1 Jan||15.9||0.0||2.3||14 Jul||337.4||283.3||high||119%|
|Telfer Aero||34.6||+0.5||46.5||1 Jan||20.6||+1.2||7.0||11 Aug||246.0||359.6||average||68%|
|Warburton Airfield||29.8||0.0||45.3||30 Dec||16.2||+1.6||0.1||14 Jul||183.2||240.2||average||76%|
|Wiluna||30.0||+0.9||45.4||31 Dec||-0.5||2 Jul||229.1||254.9||average||90%|
A Annual 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 12 pm on Tuesday 4 January 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
(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.