Thursday, 3 January 2008- Monthly Climate Summary for Perth - Product Code:IDCKGC11L0
Wettest December for 11 years in Perth
December rainfall - above average: The city received 18.0 mm of rainfall on 7 days in December, which was the wettest December since 20.6 mm in 1996. The average for December is 13 mm on about four days. Historically, December rainfall has ranged from zero in five Decembers to 80.7 mm in 1951. Last December Perth registered 5.2 mm on two days.
Mean daily maximum temperature - below average: Perth's
mean daily maximum temperature in December was 27.7°C, making it the lowest
mean daily maximum temperature for December since 23.7°C in 2005. The
average for December is 28.8°C. Last December was a warm 30.4°C. Daily
maxima ranged from a mild 20.1°C on the 6th to a hot 44.2°C on the 26th
(Boxing Day), which was the hottest daily maximum temperature in Perth
for December on record. The previous record being 42.3°C on 31 December
Climate of Perth in January
It is midsummer in Perth in January, and days are generally sunny and either warm or hot. The low humidity that generally occurs on days of high temperature makes conditions more tolerable. Sea-breezes that blow across the coastal plain on most afternoons moderate the temperature. Hot spells, usually of two or three days, duration, are commonly followed by milder conditions. On average, January is Perth's driest month with 10 mm of rain on about two days.
Denotes lowest January maximum temperature on record has occurred on the following dates: 19 January 1939 and 3 January 2007.
Very hot days in January: On average, Perth can expect one day when the maximum temperature is 40°C degrees or higher. The greatest number of such days in January was four in 1961, 1965 and 1968. The last time Perth recorded such a day in January was on 28 January 2007 when 41.6°C was recorded.
Hot days in January: On average, Perth can expect eleven days when the maximum temperature is 32°C or higher. The highest number of such days in January was 24 in 1962, when the record highest mean maximum temperature for January (34.4°C) was set.
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 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 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.