Tuesday, 3 June 2008 - Monthly Climate Summary for Perth - Product Code:IDCKGC11L0

Another dry May for Perth

Rainfall - below average: The city received 59.6 mm of rainfall over 13 days in May compared with the average of 119 mm over about 12 days.  The wettest day in May 2008 was the 22nd when 10.6 mm was recorded. Historically, May rainfall has ranged from 14.1 mm in 1964, to 308.1 mm in 1879. Last May Perth registered 61.4 mm on 13 days.

Year to date rainfall - above average: The total rainfall for January to May this year was 275.0 mm recorded on 31 rain days, making it the wettest such period the 294.4 mm on 44 days in 1990. The average is 204 mm on 28 days. Last year Perth recorded 166.6 mm on 35 days for the first five months of the year.

Mean daily maximum temperature - near average: Perth's mean daily maximum temperature in May was 22.6°C, compared with the average of 22.3°C. Daily maxima ranged from a mild 17.7°C on the 16th to a warm 27.7°C on the 9th.

Mean daily minimum temperature - near average: Perth's mean daily minimum temperature in May was 10.3°C, compared with the average of 10.9°C. Daily minima ranged from a cool 5.2°C on the 17th to a mild 16.8°C on the 31st.

May monthly mean temperature and sunshine
Element

2008

Long- term Average

Highest

Year

Lowest

Year Records Commence
Maximum
Temperature (°C)
22.6
22.3
24.0
2003
18.7
1931/1956
1897
Minimum Temperature (°C)
10.3
10.9
13.8
1972/2005
8.8
2000
1897
Sunshine
(hours per day)
7.0
6.7
7.9
2000
3.4
1905
1898
May rainfall and rain days
Element 2008 Long-term Average Highest Year Lowest Year Records Commence
Rainfall (mm)
59.6
119
308.1
1879
14.1
1964
1876
Rain days
13
12.2
25
1921
5
1913
1876

May daily extremes
Element 2008 Date Extreme Date

Records Commence

Highest daily maximum (°C)
27.7
09/05/2008
34.3
01/05/2002
1897
Lowest daily maximum (°C)
17.7
16/05/2008
11.5
23/05/1995
1897
Highest daily minimum (°C)
16.8
31/05/2008
20.8
01/05/1983
1897
Lowest daily minimum (°C)
5.2
17/05/2008
1.3
11/05/1914
1897
Wettest 24 hours to 9am (mm)
10.6
22/05/2008
76.2
17/05/1942
1876

Climate of Perth in June
June is Perth's wettest month of the year, on average. Cool and cloudy days are common. Some are cold, windy and showery, while others are sunny with light winds.

June monthly mean temperatures and sunshine
Element Average Highest Year Lowest Year

Records
Commence

Maximum temperature (°C)
19.3
20.6
1983
15.9
1898
1897
Minimum temperature (°C)
8.7
12.8
1964
5.8
2006
1897

Sunshine (hours per day)

5.9
7.4
2006
2.9
1945
1898
June monthly rainfall and rain days
Element
Average
Highest
Year
Lowest
Year
Records Commence
Rainfall (mm)
177
476.1
1945
24.6
2006
1876
Rain days
15.5
27
1918/1970
5
2006
1876

June daily extremes
Element
Highest
Date
Lowest
Date
Records Commence
Maximum temperature (°C)
28.1
05/06/1975
8.8
26/06/1956
1897
Minimum temperature (°C)
18.7
12/06/1988
−0.7
17/06/2006
1897
Rainfall 24 hours to 9am (mm)
99.1
10/06/1920
n/a
n/a
1876

Warm days in June: On average, Perth can expect 12 days when the maximum temperature is 20°C or more. The greatest number of such days in June was 21 days in 1983. Last June, Perth recorded 15 such days.

Cold days in June: On average, Perth can expect one day when the maximum temperature is 15°C or less. The greatest number of such days in June was 10 in 1931 and 1955. Last June, Perth recorded no such days.

Cold nights in June: Perth has a mean of six cold nights when the minimum temperature is 5°C or lower. The greatest number of such nights was 13 in 2006. Last June, Perth recorded four such days.

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.

Further information:
John Relf (JR) and Yanhui Blockley
Western Australia Climate Services Centre
on, tel: (08) 9263 2222, office hours.