Thursday, 1 November 2007 - Monthly Climate Summary for Perth - Product Code:IDCKGC11L0

A near average October in Perth

October Rainfall - near average: The city received 42.4 mm of rainfall over 8 days in October compared with the average of 53 mm on about 9 days. Last October Perth registered 18.6 mm on 7 days.

Year to date rainfall - below average: The total rainfall for January to October this year was 679.8 mm on 107 days. The average is 821 mm on about 101 days. Last year Perth recorded its driest (January to October) period on record with 445.4 mm.

Mean daily maximum temperature - average: Perth's mean daily maximum temperature in October was 22.8°C, equalling the long-term average of 22.8°C. Daily maxima ranged from a cool 16.0°C on the 27th to a warm 30.7°C on the 24th.

Mean daily minimum temperature - near average: Perth's mean daily minimum temperature in October was 10.7°C, compared with the average of 11.1°C. Daily minima ranged from a cold 4.7°C on the 29th, which was Perth's latest ever minimum temperature of less than 5°C, to a mild 16.4°C on the 17th.

October monthly mean temperature and sunshine
Element	2007	Long- term Average	Highest	Year	Lowest	Year	Records Commence
Maximum Temperature (°C)	22.8	22.8	25.8	1969	18.8	1924	1897
Minimum Temperature (°C)	10.7	11.1	14.2	1969	9.3	1910	1897
Sunshine (hours per day)	9.8	9.6	10.9	2000	5.5	1898	1898
October rainfall and rain days
Element	2007	Long-term Average	Highest	Year	Lowest	Year	Records Commence
Rainfall (mm)	42.4	53	199.9	1890	1.0	1969	1876
Rain days	8	9.3	22	1898	1	1969	1876

October daily extremes
Element	2007	Date	Extreme	Date	Records Commence
Highest daily maximum (°C)	30.7	24/10/2007	37.3	29/10/1967	1897
Lowest daily maximum (°C)	16.0	27/10/2007	11.9	08/10/1932	1897
Highest daily minimum (°C)	16.4	17/10/2007	22.2	29/10/1979	1897
Lowest daily minimum (°C)	4.7	29/10/2007	2.2	06/10/1994	1897
Wettest 24 hours to 9am (mm)	12.4	27/10/2007	68.2	18/10/1995	1876

Climate of Perth in November

November days in Perth are generally sunny and either mild or warm. A few hot days occur, usually in the latter part of the month. The general springtime decline in rainfall continues with an average of 22 mm over about six days.

** Denotes the highest daily maximum temperature recorded on 11 November 2003 and 24 November 1913.

Hot days in November: On average, Perth can expect four November days when the maximum temperature is 32°C or higher. The record of nine such days was set in 1940 whilst last November Perth recorded four such days.

Earliest 40°C day of the season: The earliest 40°C maximum temperature of the season occurred on 11 November 2003, when 40.3°C was recorded. A maximum temperature of 40°C or higher has only occurred three times in November in Perth since records began in 1897.

Note: 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 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.

Further information:
John Relf (JR) and Glenn Cook Western Australia Climate Services Centre
on, tel: (08) 9263 2222, office hours.