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Thursday, 1 October 2009 - Monthly Climate Summary for Western Australia - Product code IDCKGC21R0
An archive of previous monthly summaries for Western Australia is also available, as are summaries for other states and many other climate summaries and diagnostics.
Jump to: Extremes Maps Records Summaries Notes the top
Rainfall over Western Australia in 2009 was mainly above to very much above average for the south of the state, apart from patches of below average rainfall in the Gascoyne, Goldfields and eastern parts of the Southwest Land Division (SWLD) (see September rainfall decile map). Persistent cold fronts throughout the month resulted in Denbarker (in the South Coastal) observing it's highest September total on record, while several stations in the west of the SWLD observed their highest September rainfall for over 30 years.
In the north, rainfall was below average through most of the Pilbara and Kimberley, however rainfall during September is typically low. Thus, when averaged over the state as a whole, September 2009 rainfall was near average.
September 2009 saw above to very much above average daytime temperatures throughout the Kimberley and most of the Interior, with areas of up to 3°C warmer than normal (see September maximum temperature anomaly map). Several stations in the northeast of the state broke their highest daily and monthly maximum temperatures, and a particularly hot stretch in the middle part of the month culminated in Wyndham Aero (in the North Kimberley) recording 42.0°C on the 22nd which is their hottest September day in 9 years of record (previous record for September was 41.0°C on 27th September 2002 and 25 September 2007).
In contrast, the southwest of the state was below to very much below average, in terms of maximum temperature, with patches in the SWLD up to 3°C cooler than average (see September maximum temperature anomaly map). Persistent frontal activity and westerly flow over the south of the state during the month resulted in the lowest mean daily maximum temperature for over 30 years at several stations in the Southwest and Lower West. September 2009 in the Lower Southwest (southwest of a line from approximately Jurien Bay to Bremer Bay) was the 2nd coldest September since comparable records began in 1950, coming in at 1.6°C cooler than the long term mean (the coldest September for this region was in 1992 which was 2.3°C below normal). A cold airmass in the wake of a front on the 30th ensured that Meekatharra (in the Gascoyne) broke it's lowest daily maximum temperature record for September .
The warm conditions in the north and cool conditions in the south meant that when averaged over the state as a whole, the mean maximum temperature for September 2009 was near average.
Minimum temperature over WA during September 2009 was below to very much below average for most of the southwest half of the state contrasting with above to very much above average overnight temperature in the northeast (see September minimum temperature anomaly map). Halls Creek (in the Kimberley) recorded it's warmest overnight temperature on the 20th with 27.4°C, while in contrast many stations in the south of the state observed their coldest September for over 30 years with Meekatharra (in the Gascoyne) and Dalwallinu (in the Central Wheat Belt) breaking their lowest mean minimum temperature records for September.
When averaged across WA, mean minimum temperature was near average.
| Hottest day Highest temperature |
42.0°C at Wyndham Aero on the 22nd |
|---|---|
| Warmest days on average Highest mean daily maximum temperature |
38.8°C at Wyndham Aero |
| Coolest days on average Lowest mean daily maximum temperature |
14.1°C at Rocky Gully |
| Coldest day Lowest daily maximum temperature |
9.8°C at Rocky Gully on the 5th |
| Coldest night Lowest temperature |
−4.3°C at Eyre on the 9th |
| Coolest nights on average Lowest mean daily minimum temperature |
3.3°C at Southern Cross Airfield |
| Warmest nights on average Highest mean daily minimum temperature |
26.2°C at Troughton Island 23.9°C at Argyle Aerodrome (mainland) |
| Warmest night Highest daily minimum temperature |
28.1°C at Warmun on the 18th |
| Wettest overall Highest total rainfall |
283.4 mm at Mount William |
| Wettest day Highest daily rainfall |
42.6 mm at Karnet on the 12th |
| Highest wind gust |
119 km/h at Busselton Jetty on the 10th |
Jump to: Extremes Maps Records Summaries Notes the top
| Record highest total September rainfall | |||||
|---|---|---|---|---|---|
|
Total rainfall for September 2009 (mm) |
Previous highest for September |
Years of record |
Average for September |
||
| Denbarker | 147.2 | 144.6 | in 1996 | 38 | 85.9 |
| Highest total September rainfall for at least 30 years | |||||
|---|---|---|---|---|---|
|
Total rainfall for September 2009 (mm) |
Most recent higher for September |
Years since higher |
Average for September |
||
| Dwellingup | 243.4 | 298.9 | in 1971 | 38 | 130.8 |
| Marradong | 126.0 | 129.2 | in 1971 | 38 | 72.0 |
| Mundaring | 205.8 | 251.7 | in 1971 | 38 | 112.9 |
| Balingup | 161.4 | 169.3 | in 1971 | 36 | 87.3 |
| Carnamah | 55.7 | 71.9 | in 1973 | 36 | 28.4 |
| Jarrahdale | 195.6 | 251.3 | in 1973 | 32 | 125.7 |
| Record highest September daily maximum temperature | ||||||
|---|---|---|---|---|---|---|
|
Highest temperature in September 2009 (°C) |
Previous highest for September |
Years of record |
Average for September |
|||
| Onslow | 39.0 | on the 25th | 38.9 | on the 2nd in 2007 | 49 | 29.1 |
| Troughton Island | 34.4 | on the 24th | 33.6 | on the 27th in 1971 | 31 | 30.2 |
| Record lowest September daily maximum temperature | ||||||
|---|---|---|---|---|---|---|
|
Lowest daily maximum temperature in September 2009 (°C) |
Previous lowest for September |
Years of record |
Average for September |
|||
| Meekatharra Airport | 13.7 | on the 30th | 15.0 | on the 1st in 1956 | 60 | 25.6 |
| Yeelirrie | 13.2 | on the 30th | = 13.2 | on the 29th in 1992 | 36 | 25.8 |
| Record highest September mean daily maximum temperature | |||||
|---|---|---|---|---|---|
|
Mean daily maximum temperature for September 2009 (°C) |
Previous highest for September |
Years of record |
Average for September |
||
| Halls Creek Airport | 36.3 | = 36.3 | in 1995 | 61 | 34.0 |
| Balgo Hills | 35.8 | 35.5 | in 2005 | 30 | 33.8 |
| Record lowest September mean daily maximum temperature | |||||
|---|---|---|---|---|---|
|
Mean daily maximum temperature for September 2009 (°C) |
Previous lowest for September |
Years of record |
Average for September |
||
| Badgingarra Research Stn | 17.7 | 18.5 | in 1992 | 42 | 20.6 |
| Karnet | 15.3 | 15.4 | in 1971 | 42 | 17.5 |
| Lowest September mean daily maximum temperature for at least 30 years | |||||
|---|---|---|---|---|---|
|
Mean daily maximum temperature for September 2009 (°C) |
Most recent lower for September |
Years since lower |
Average for September |
||
| Donnybrook | 17.1 | 16.3 | in 1931 | 75 | 18.8 |
| Cape Leeuwin | 16.2 | 16.0 | in 1971 | 38 | 17.0 |
| Dwellingup | 15.5 | 15.2 | in 1971 | 35 | 17.2 |
| Record highest September daily minimum temperature | ||||||
|---|---|---|---|---|---|---|
|
Highest daily minimum temperature in September 2009 (°C) |
Previous highest for September |
Years of record |
Average for September |
|||
| Halls Creek Airport | 27.4 | on the 20th | 27.3 | on the 30th in 1992 | 62 | 18.9 |
| Record highest September mean daily minimum temperature | |||||
|---|---|---|---|---|---|
|
Mean daily minimum temperature for September 2009 (°C) |
Previous highest for September |
Years of record |
Average for September |
||
| Troughton Island | 26.2 | 25.8 | in 2005 | 30 | 24.5 |
| Record lowest September mean daily minimum temperature | |||||
|---|---|---|---|---|---|
| Mean daily minimum temperature for September 2009 (°C) |
Previous lowest for September |
Years of record |
Average for September |
||
| Meekatharra Airport | 9.5 | 9.7 | in 1992 | 59 | 11.5 |
| Dalwallinu Comparison | 6.3 | 6.4 | in 1966 | 53 | 7.9 |
| Esperance | 8.4 | = 8.4 | in 1973 | 40 | 9.5 |
| Lowest September mean daily minimum temperature for at least 30 years | |||||
|---|---|---|---|---|---|
|
Mean daily minimum temperature for September 2009 (°C) |
Most recent lower for September |
Years since lower |
Average for September |
||
| Lake Grace Comparison | 5.0 | 4.7 | in 1969 | 40 | 6.7 |
| Carnamah | 6.9 | 6.5 | in 1966 | 37 | 8.1 |
| Merredin | 5.1 | 4.8 | in 1973 | 36 | 6.7 |
| Bencubbin | 6.2 | 5.8 | in 1973 | 34 | 7.2 |
| Salmon Gums Res.Stn. | 4.6 | 3.9 | in 1969 | 34 | 5.8 |
| Carnarvon Airport | 12.8 | 12.6 | in 1977 | 32 | 13.9 |
| Hyden | 4.7 | 4.2 | in 1975 | 31 | 5.9 |
| Roebourne | 15.7 | 15.7 | in 1978 | 30 | 16.8 |
Jump to: Extremes Maps Records Summaries Notes the top
This statement has been prepared based on information available at 10 am on Thursday 1 October 2009. 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 30 years of record, as they cannot then be calculated
reliably.
The median
is sometimes more representative than the mean
of long-term average rain.
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