Tuesday, 2 June 2009 - Seasonal Climate Summary for Perth - Product Code: IDCKGC21L0
Second driest and warmest autumn for Perth with record sunshine
Rainfall - second driest on record: In autumn 2009, Perth received 57.8 mm on 12 days, compared with the average of 181 mm on about 24 days. This was the second driest autumn on record since records commenced in 1876, and was the driest autumn since the record low of 42.4 mm on 19 days in 1983. Rainfall totals for individual months this autumn were: March 6.8 mm (average 19 mm), April 5.0 mm (average 44 mm) and May 46.0 mm (average 118 mm). The wettest day was on 23 May 2009 when 21.0 mm of rain was recorded. Last autumn, Perth recorded 227.4 mm on 29 days.
Mean daily maximum temperature - second highest on record: The mean daily maximum temperature for Perth this autumn was 26.9°C, compared to the average of 25.7°C. This was the second highest mean daily maximum temperature for autumn since records commenced in 1897, and was the warmest autumn since the record high of 27.2°C in 1978. Daily values this autumn ranged from a cool 16.1°C on 23 May to a very hot 39.8°C on 15 March. Last autumn the mean daily maximum temperature was 25.4°C.
Mean daily minimum temperature - below average: The mean daily minimum temperature for Perth this autumn was 12.5°C, compared to the average of 13.6°C. Daily minima ranged from a cold 3.3°C on 25 May to a warm 21.7°C on 1 March. Last autumn the mean daily minimum temperature was 13.2°C.
Mean daily sunshine hours - highest on record: Perth's mean daily sunshine hours this autumn was 9.0 hours, compared with the average of 8.1 hours. This was the highest mean daily sunshine hours for autumn since sunshine records commenced in Perth in 1898. The previous record was 8.8 hours in 1972.
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 Perth (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 Perth (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.