Monday 2 July, 2007 - Monthly Climate Summary for Perth - Product Code: IDCKGC11L0

Third driest June on record for Perth

Rainfall - very much below average: The city received 60.0 mm of rainfall over 11 days in June compared with the average of 178 mm over about 16 days. Since records began in 1876, this was Perth's third driest June on record. The wettest day in June 2007 was the 23rd when 19.2 mm was recorded. Historically, June rainfall has ranged from 24.6 mm in 2006, to 476.1 mm in 1945.

Perth's top 10 driest Junes
Season
Rainfall (mm)
Rain Days
Ranking
2006
24.6
5
1
1877
54.9
10
2
2007
60.0
11
3
1993
64.4
10
4
1989
68.0
10
5
1958
70.4
11
6
2001
71.6
12
7
1977
74.6
13
8
1893
81.8
9
9
1976
84.8
9
10

Year to date rainfall - very much below average: The total rainfall for January to June this year was 226.6 mm recorded on 44 days compared with the average of 382 mm over 43 days. The total for the same period last year was 134.6 mm.

Mean daily maximum temperature - near average: Perth's mean daily maximum temperature in June was 19.9°C, compared with the average of 19.2°C. Daily maxima ranged from a cool 15.8°C on the 20th to a warm 24.5°C on the 12th, which was the highest daily maximum temperature for June since the 24.6°C on 16 June 2004.

Mean daily minimum temperature - near average: Perth's mean daily minimum temperature in June was 8.5°C, compared with the average of 8.7°C. Daily minima ranged from a cold 3.8°C on the 22nd to a mild 14.3°C on the 30th.

Cold nights: Perth recorded four cold nights this June with a minimum temperature of 5°C or less. The average for June is six nights. Last June Perth recorded its greatest number of such nights with 13.

June monthly mean temperature and sunshine
Element

2007

Long- term Average

Highest

Year

Lowest

YearRecords Commence
Maximum
Temperature (°C)
19.9
19.2
20.6
1983
15.9
1898
1897
Minimum Temperature (°C)
8.5
8.7
12.8
1964
5.8
2006
1897
Sunshine
(hours per day)
6.9
5.8
7.4
2006
2.9
1945
1898
June rainfall and rain days
Element2007Long-term AverageHighestYearLowestYearRecords Commence
Rainfall (mm)
60.0
178
476.1
1945
24.6
2006
1876
Rain days
11
15.8
27
1918/1970
5
2006
1876
June daily extremes
Element2007DateExtremeDate

Records Commence

Highest daily maximum (°C)
24.5
12/06/2007
28.1
05/06/1975
1897
Lowest daily maximum (°C)
15.8
20/06/2007
8.8
26/06/1956
1897
Highest daily minimum (°C)
14.3
30/06/2007
18.7
12/06/1988
1897
Lowest daily minimum (°C)
3.8
22/06/2007
−0.7
17/06/2006
1897
Wettest 24 hours to 9am (mm)
19.2
23/06/2007
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
ElementAverageHighest YearLowest Year

Records
Commence

Maximum temperature (°C)
18.3
19.9
1976/1977
15.7
1910
1897
Minimum temperature (°C)
7.9
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
17.2
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 degrees or more. The greatest number of such days in July was 14 days in 1976 and 1977. Last July, Perth recorded 10 such days.

Cold days in July: On average, Perth can expect two days when the maximum temperature is 15 degrees or less. The greatest number of such days in July was 12 in 1916. Last July, Perth recorded three such days.

Cold nights in July: Perth has a mean of eight cold nights when the minimum temperature is 5 degrees or lower. The greatest number of such nights was 16 in 1998. Last July, Perth recorded eight cold 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.