Tuesday, 5 January 2010 - Annual Climate Summary for Perth - Product Code:IDCKGC51L0
Second warmest year on record for Perth
Annual mean maximum temperature - very much above average: Perth's annual mean maximum temperature in 2009 was 25.0°C, which is the second warmest year on record for Perth and the highest annual mean maximum temperature since the 25.2°C in 1978, the warmest ever year in Perth. The annual average is 24.4°C whilst last year the mean annual maximum temperature was 24.6°C.
Daily maxima ranged from a cold 12.8°C on 23 June to a very hot 41.8°C on 16 January.
During 2009, Perth recorded 58 hot days when the maximum temperature
was 32°C or higher, the greatest such number of days since the 66
days in 1978. The annual average is 47.
Daily minima ranged from a cold 1.5°C on 14 July to a warm 23.7°C on 11 February.
Perth recorded 25 nights when the minimum temperature was 5°C or less, the least number of such nights since the 24 nights in 2007. The average is 27.
Annual rainfall - very much below average: Perth's annual rainfall for 2009 was 608.2 mm on 108 days, Perth's 10th driest year on record. It was Perth's driest year since the 466.8 mm on 97 days in 2006, which was Perth's driest year on record. The long-term average is 854 mm on about 112 days, whilst last year Perth recorded 807.8 mm on 117 days.
Perth's wettest month in 2009 was June with 156.2 mm on 19 days, 20.8 mm below the average of 177 mm. Every month in 2009 saw below average rainfall except November, which recorded 38.2 mm; the average being 22 mm. The wettest day in 2009 was on 19 July with 30.6 mm.
Annual mean sunshine hours - average: Perth's annual mean sunshine hours in 2009 was 8.8 hours, compared with the average of 8.8 hours.
Denotes * 6 February 1898, 8 February 1933 and 3 February 1962.
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.