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Friday 1 September, 2006 MONTHLY CLIMATE SUMMARY - WESTERN AUSTRALIA REGIONAL OFFICE Driest year to date on record for PerthYear to date rainfall - record low: The total rainfall
for January to August this year was 340.4 mm recorded on 63 days making
it the driest such period on record. The previous record low was 361.7
mm on 65 days in 1940. The average is 690 mm.
August Rainfall - below average: The city received 124.8
mm of rainfall over 17 days in August compared with the average of 135
mm over 16 days. The wettest day in August 2006 was the 15th when 27.0
mm was recorded. Last August Perth registered 124.6 mm on 12 days.
# This is a preliminary figure based on the available data at the time of issue of this summary. Please check updated mean sunshine hours from Daily Weather Observations for Perth in early September.
Climate of Perth in SeptemberSeptember is the first month of spring and in Perth a warm drying trend is often experienced. Monthly rainfall and the number of wet days generally decreases, whilst maximum and minimum temperatures and the number of sunshine hours increases.
* 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 Perth's warmest September on record, 1987, when the mean maximum temperature was 22.6°C. 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 whilst there were no such days in 2005. Cold nights in September: On average, Perth can expect three nights each September when the minimum is 5°C or lower. The record is seven nights in 2004 and there were three such nights in 2005. 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 maximum temperature for September on record.
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: |
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