Monday, 3 September 2007 - Monthly Climate Summary for Perth - Product Code:IDCKGC11L0
An average August in Perth
Rainfall - near average: The city received 130.8 mm of rainfall over 20 days in August compared with the average of 135 mm on about 16 days. Historically, August rainfall has ranged from 11.8 mm in 1902 to 318.3 mm in 1945. The wettest day in August 2007 was the 11th when 23.6 mm was recorded.
Year to date rainfall - below average: The total rainfall for January to August this year was 536.8 mm recorded on 83 days compared with the average of 687 mm on about 77 days. Last year Perth recorded its driest January to August period on record with 340.4 mm.
Mean daily maximum temperature - near average: Perth's mean daily maximum temperature in August was 19.0°C, compared with the average of 18.7°C. Daily maxima ranged from a cold 14.5°C on the 10th, the lowest daily maximum temperature for August since the 13.3°C on 28 August 2004, to a warm 24.3°C on the 18th.
daily minimum temperature - near average: Perth's mean daily minimum
temperature in August was 8.8°C, compared with the average of 8.2°C. Daily
minima ranged from a cold 3.1°C on the 12th and 13th to a mild 14.5°C
on the 23rd.
Climate of Perth in September
* Denotes the lowest minimum temperature for September on record on the following dates: 1 and 10 September 2005.
Warm days in September: On average, Perth can expect two days when the maximum temperature is 25°C or higher. The record is 10 days in 1987, when the highest mean daily maximum temperature on record for September of 22.6°C was recorded.
Earliest 32-degree day of the season (hot day): The earliest 32-degree maximum temperature of the season was on 18 September 1988, when 32.3°C was recorded, the second highest temperature for September on record.
Cold days in September: On average, Perth can expect approximately one day every five years when the maximum temperature is 15°C or lower. The record is four days in 1903 and there were no such days in 2006.
Cold nights in September: On average, Perth can expect three nights when the minimum is 5°C or lower. The record is seven nights in 2004 and there were four such nights in 2006.
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 (Mount 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 (Mount 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.