Friday 2 January 2009 - Monthly Climate Summary for Perth - Product Code: IDCKGC11LO
Another slightly cooler than average December for Perth
Mean daily maximum temperature - near
Perth's mean daily maximum temperature in
December was 27.8°C, compared with the long-term average of
28.7°C. Daily maxima ranged from a mild 21.9°C on the 10th to
39.0°C on the 30th. Last year Perth recorded a mean December
maximum of 27.7°C.
Annual rainfall - near average: The total rainfall for 2008 for Perth was 807.8 mm on 117 days, compared with the long-term average of 855 mm on about 111 days. Last year 2007, Perth recorded 703.0 mm on 117 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 January
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 falling 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 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 17 January 2008 when 41.3°C was recorded.
Hot days in January: On average, Perth can expect twelve days when the maximum temperature is 32 degrees 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 degrees) 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 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.