Product Code: IDCKGC21L0

Wednesday 28 February, 2007

Perth Seasonal Climate Summary: Summer 2006/07

Near average conditions

Rainfall - near average: This summer the rainfall in Perth was near average. From December to February, Perth received 27.8 mm over 11 days compared with the average of 35 mm over 8 days. It was Perth's driest summer since 2004/05, then 5.6 mm on 6 days. Last summer, Perth recorded 54.0 mm over 14 days. Rainfall totals for individual months this summer were: December 5.2 mm (average 13 mm), January 19.2 mm (average 9 mm) and February 3.4 mm (average 13 mm). The wettest day was on 3 January 2007 when 13.6 mm of rain was recorded.

Mean daily maximum temperature - near average: The mean daily maximum temperature for Perth this summer of 29.9°C was close to the average of 30.1°C. Last summer the mean daily maximum temperature was 27.8°C the coolest summer since the 27.6°C in 1959/60. Daily values this summer ranged from a cool 19.7°C on 3 January 2007 to a very hot 41.6°C on 28 January 2007.

Daily maximum temperatures of 40 degrees or higher was reached on 4 occasions this summer whereas the average for summer is 3 such days. This was the greatest number of such days since the 6 days in the summer of 1997/98. In late January Perth experienced four consecutive days with maximum temperatures greater than 38°C. The last time this occurred was between 7 and 10 March 2003.

Mean daily minimum temperature - near average: The mean daily minimum temperature for Perth this summer was 16.9°C, compared to the average of 17.2°C. Daily minima ranged from a cool 9.7°C on 1 December 2006 to a warm 25.1°C on 26 February 2007. Last summer the mean daily minimum temperature was 16.2°C.

Summer mean temperature and sunshine
Element

Summer 2006/7

Long- term Average

Highest

Year

Lowest

YearRecords Commence
Maximum
Temperature (°C)
29.9
30.1
32.0
1977/78
26.4
1901/02
1897
Minimum Temperature (°C)
16.9
17.2
20.3
1977/78
15.4
1901/02
1897
Sunshine
(hours per day)
11.0
11.5
12.2
1997/98
8.7
1922/23
1898
Summer rainfall and rain days
Element2007Long-term AverageHighestYearLowestYearRecords Commence
Rainfall (mm)
27.8
35
180.4
1954/55
0.8
1974/75
1876
Rain days
11
8.1
20
1913/14
2
3 years
1876

Summer daily extremes
ElementSummer 2006/07DateExtremeDate

Records Commence

Highest daily maximum (°C)
41.6
28/01/2007
46.2
23/02/1991
1897
Lowest daily maximum (°C)
19.7
03/01/2007
14.9
17/12/1952
1897
Highest daily minimum (°C)
25.1
26/02/2007
29.3
* 3 years
1897
Lowest daily minimum (°C)
9.7
01/12/2006
8.4
02/12/2002
1897
Wettest 24 hours to 9am (mm)
13.6
03/01/2007
120.6
09/02/1992
1876

* Denotes highest February minimum temperature on record has occurred on the following dates: 6 February 1898, 8 February 1933 and 3 February 1962.

Past summers in Perth 1999−2007
Season
Mean Maximum(°C)
Mean Minimum(°C)
Total Rainfall (mm)
Rain Days
Mean Sunshine (hour)
1996/97
30.2
17.6
24.8
11
11.5
1997/98
30.7
17.3
1.8
2
12.2
1998/99
30.4
17.8
60.8
9
11.6
1999/00
30.9
18.2
146.2
13
11.0
2000/01
29.9
17.3
9.8
8
11.3
2001/02
29.3
16.3
31.4
10
11.4
2002/03
30.6
17.5
16.2
12
11.4
2003/04
30.4
17.6
7.6
6
11.6
2004/05
30.0
16.7
5.6
6
11.6
2005/06
27.8
16.2
54.0
14
10.5
2006/07
29.9
16.9
27.8
11
11.0

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), or Glenn Cook tel: (08) 9263 2222 on weekdays.