Tuesday, 1 July 2008 - Monthly Climate Summary for Perth - Product Code:IDCKGC11L0

Near average rainfall for June for Perth

Rainfall - near average: The city received 142.0 mm of rainfall over 14 days in June compared with the average of 177 mm over about 16 days.  The wettest day in June 2008 was the 1st when 42.8 mm was recorded which was Perth's wettest June day for 3 years. Historically, June rainfall has ranged from 24.6 mm in 2006, to 476.1 mm in 1945. Last year in June Perth recorded 60.0 mm on 11 days.

Year to date rainfall - near average: The total rainfall for January to June this year was 417.0 mm recorded on 45 days compared with the average of 381 mm on about 43 days. The total for the same period last year was 226.6 mm on 44 days.

Mean daily maximum temperature - near average: Perth's mean daily maximum temperature in June was 19.7°C, compared with the average of 19.3°C. Daily maxima ranged from a cold 14.2°C on the 26th, to a warm 23.2°C on the 3rd.

Mean daily minimum temperature - near average: Perth's mean daily minimum temperature in June was 7.8°C, which was the lowest mean daily minimum temperature recorded since the 5.8°C in 2006. The average for June is 8.7°C. Daily minima ranged from a cold 2.9°C on the 22nd to a mild 15.1°C on the 1st.

Cold nights: Perth recorded 11 cold nights this June with a minimum temperature of 5 degrees or less the most such nights since the 13 nights in 2006. The average for June is six nights. Last June Perth recorded four cold night.
 

June monthly mean temperature and sunshine
Element

2008

Long- term Average

Highest

Year

Lowest

Year Records Commence
Maximum
Temperature (°C)
19.7
19.3
20.6
1983
15.9
1898
1897
Minimum Temperature (°C)
7.8
8.7
12.8
1964
5.8
2006
1897
Sunshine
(hours per day)
6.6
5.9
7.4
2006
2.9
1945
1898
June rainfall and rain days
Element 2008 Long-term Average Highest Year Lowest Year Records Commence
Rainfall (mm)
142.0
177
476.1
1945
24.6
2006
1876
Rain days
14
15.5
27
1918/1970
5
2006
1876

June daily extremes
Element 2008 Date Extreme Date

Records Commence

Highest daily maximum (°C)
23.2
03/06/2008
28.1
05/06/1975
1897
Lowest daily maximum (°C)
14.2
26/06/2008
8.8
26/06/1956
1897
Highest daily minimum (°C)
15.1
01/06/2008
18.7
12/06/1988
1897
Lowest daily minimum (°C)
2.9
22/06/2008
−0.7
17/06/2006
1897
Wettest 24 hours to 9am (mm)
42.8
01/06/2008
99.1
10/06/1920
1876

Climate of Perth in July
July is one of Perth's coldest and wettest months. Many days are cloudy, wet and windy, though there are generally some sunny days with light winds and cold nights.

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

Records
Commence

Maximum temperature (°C)
18.4
19.9
1976/1977
15.7
1910
1897
Minimum temperature (°C)
8.0
11.4
1921
5.3
1997
1897

Sunshine (hours per day)

6.1
7.5
1918
3.2
1926
1898
July monthly rainfall and rain days
Element
Average
Highest
Year
Lowest
Year
Records Commence
Rainfall (mm)
170
425.1
1958
61.5
1876
1876
Rain days
17.3
29
1946
6
1918
1876

July daily extremes
Element
Highest
Date
Lowest
Date
Records Commence
Maximum temperature (°C)
26.3
Twice
10.5
09/07/1906
1897
Minimum temperature (°C)
16.1
12/07/1898
0.0
†† Twice
1897
Rainfall 24 hours to 9am (mm)
95.0
29/07/1987
n/a
n/a
1876

†Denotes the highest maximum temperature for July on record on the following dates: 17 & 18 July 1976.

††Denotes the lowest minimum temperature for July on record on the following dates: 15 July 1997 and 27 July 1998.

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 9 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 no 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 four 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.

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