Wednesday, 1 July 2009 - Monthly Climate Summary for Perth - Product Code: IDCKGC11LO
Near Average Rainfall for June in Perth
Rainfall - near average:
The city received 156.2 mm of rainfall over 19 days in June compared
with the average of 177 mm over about 15 days. The wettest
day in June 2009 was the 29th when 23.2 mm was recorded.
Historically, June rainfall has ranged from 24.6 mm in 2006, to 476.1
mm in 1945. Last year in June, Perth recorded 142.0 mm on 14 days.
Year to date rainfall - well below average: The total rainfall for January to June this year was 222.4 mm on 35 days, which was the driest January to June period since the 134.6 mm in 2006. The average for this period is normally 381 mm on about 43 days. The total for the same period last year was 417.0 mm on 45 days.
Mean daily maximum temperature - near average: Perth's mean daily maximum temperature in June was 18.8°C, compared with the average of 19.3°C, which was the lowest mean daily maximum temperature for June since the 18.0°C in 2005. Daily maxima ranged from a cold 12.8°C on the 23rd, the coldest day for four years, to a warm 26.2°C on the 1st, the warmest June day for 25 years since the 26.8°C on 4 June 1984.January to June mean daily maximum temperature - second highest on record: Perth's mean daily maximum temperature for the January to June period was 27.4°C, compared with the average of 26.4°C. This was the second highest mean daily maximum temperature for this period since records commenced in 1897, the highest being 27.6°C in 1978.
Mean daily minimum temperature - near average: Perth's mean daily minimum temperature in June was 8.9°C, compared with the average of 8.6°C. Daily minima ranged from a cold 3.4°C on the 14th to a mild 13.2°C on the 1st.
Cold nights: Perth recorded
four cold nights this June with a minimum temperature of 5 degrees or
less, compared with the average of six nights. Last June Perth recorded
11 cold nights.
Perth in July
highest maximum temperature for July on record on the following dates:
17 & 18 July 1976.
Warm days in July: On average, Perth can expect six days when the maximum temperature is 20°C or more. The greatest number of such days in July was 14 days in 1976 and 1977. Last July, Perth recorded four such days.
Cold days in July: On average, Perth can expect two days when the maximum temperature is 15°C or less. The greatest number of such days in July was 12 in 1916. Last July, Perth recorded two such days.
Cold nights in July: Perth has a mean of eight cold nights when the minimum temperature is 5°C or lower. The greatest number of such nights was 16 in 1998 and 2001. Last July, Perth recorded eight such nights.
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.