Monday, 3 August 2009 - Monthly Climate Summary for Western Australia - Product code IDCKGC21R0

Western Australia in July 2009
Warmer than normal in the northern half of WA

Summary

  • Near average rainfall for WA.
  • Mean maximum temperature near average for WA, above average in the northern half.
  • Above average mean minimum temperature for WA.

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.

Details

Rainfall

July rainfall was near average over much of WA, including a large part of the Southwest Land Division(SWLD). Parts of the southern Gascoyne, Goldfields and Eucla received above to very much above average rainfall, which contrasted with patches of below to very much below average rainfall in the South Coastal and Southeast Coastal districts (see July rainfall decile map). Averaged across the state, July rainfall was near average.

Maximum temperature

July 2009 mean maximum temperature was above to very much above average across the Kimberley, a large part of the Pilbara and Interior, as well as the northern Gascoyne, with up to 2°C warmer than mean maximum temperatures in the western Kimberley and northern Pilbara (see July maximum temperature anomaly map). Fitzroy Crossing Aero and Wyndham Aero in the Kimberley recorded a maximum temperature of 37.3°C on the 24th and 26th respectively, which was their highest July temperature on record and the equal second highest July temperature on record for Western Australia and Australia.

With the exception of below average mean maximum temperatures in the area extending from the southern Gascoyne, northern Central West, northern Central Wheatbelt and southern Goldfields, the remainder of the state was near average. Averaged across the state, the monthly mean maximum temperature was near average.

Minimum temperature

Monthly mean minimum temperature was above to very much above average in a large area from the southern Kimberly, Pilbara, Gascoyne and Interior, to the eastern Eucla, southern Goldfields, South Coastal and Southeast Coastal districts, with up to 3 ºC above mean minimum temperatures in the northern Interior and inland Pilbara (see July minimum temperature anomaly map). The remainder of the state was near average. Averaged across the state as a whole, the WA mean minimum temperature was above average .


Extremes

Hottest day
Highest temperature
37.3°C at Fitzroy Crossing Aero on the 24th
37.3°C at Wyndham Aero on the 26th
Warmest days on average
Highest mean daily maximum temperature
33.2°C at Kalumburu
Coolest days on average
Lowest mean daily maximum temperature
13.9°C at Katanning
Coldest day
Lowest daily maximum temperature
9.7°C at Narrogin on the 20th
Coldest night
Lowest temperature
−3.5°C at Southern Cross Airfield on the 27th
Coolest nights on average
Lowest mean daily minimum temperature
3.6°C at Southern Cross Airfield
Warmest nights on average
Highest mean daily minimum temperature
23.5°C at Troughton Island
19.4°C at Kuri Bay (mainland)
Warmest night
Highest daily minimum temperature
26.0°C at Troughton Island on the 2nd
23.8°C at Truscott (mainland) on the 2nd
Wettest overall
Highest total rainfall
249.7 mm at Walpole
Wettest day
Highest daily rainfall
68.0 mm at Cowaramup on the 19th
Highest wind gust
113 km/h at Cape Leeuwin on the 20th

Records

Record highest July daily rainfall
Highest daily rainfall
in July 2009 (mm)
Previous highest
for July
Years of
record
Manjimup 58.0 on the 19th 49.8 on the 19th in 1961 94
Paynes Find 29.0 on the 10th 28.2 on the 28th in 2008 48



Record highest July temperature
Highest temperature
in July 2009 (°C)
Previous highest
for July
Years of
record
Average for
July
Roebourne 33.9 on the 7th 33.8 on the 24th in 2002 52 26.7
Kuri Bay 36.8 on the 2nd 36.3 on the 3rd in 1981 40 31.1
Telfer Aero 33.4 on the 24th 32.8 on the 27th in 1974 36 25.3
Troughton Island 31.8 on the 2nd 31.5 on the 21st in 1998 30 28.1
Fitzroy Crossing Aero 37.3 on the 24th 37.0 on the 25th in 1998 12 30.8
Wyndham Aero 37.3 on the 26th 36.0 on the 28th in 2002 9 31.6



Record highest July daily minimum temperature
Highest daily minimum
temperature
in July 2009 (°C)
Previous highest
for July
Years of
record
Average for
July
Troughton Island 26.0 on the 2nd 25.7 on the 29th in 1958 30 22.0



Notes

This statement has been prepared based on information available at 9 am on Monday 3 August 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 generally 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.

 

Further information

Yanhui Blockley or Patrick Ward
Western Australia Climate Services Centre
Bureau of Meteorology
Phone (08) 9263 2222
Email climate.wa@bom.gov.au