Monday 3 December, 2007- Seasonal Climate Summary for Perth - Product Code: IDCKGC21L0

Warm and sunny spring in Perth

Mean daily maximum temperature - very much above average: The mean daily maximum temperature for Perth this spring of 23.8°C was above the average of 23.0°C. This was the equal second highest spring mean daily maximum temperature on record, the highest being 24.0°C in 1969 and 2006. Daily values this spring ranged from a cool 16.0°C on 27 October to a very hot 39.8°C on 12 November.

Mean daily minimum temperature - near average: The mean daily minimum temperature for Perth this spring was 11.7°C, compared with average of 11.6°C. Daily minima ranged from a cold 4.3°C on 10 September to a warm 21.6°C on 12 November. Last spring the mean minimum temperature was 12.5°C.

Rainfall - near average: This spring the rainfall in Perth was near average. From September to November, Perth received 148.2 mm over 27 days compared with the average of 156 mm over 31 days. Last spring, Perth recorded 121.2 mm over 32 days. Rainfall totals for individual months this spring were: September 100.6 mm (average 81 mm), October 42.4 (average 53 mm) and November 5.2 mm (average 22 mm). The wettest day was on 12 September when 23.6 mm of rain was recorded.

Mean daily sunshine hours - sunniest on record: Perth's mean daily sunshine hours this spring was 9.9 hours, which was the sunniest spring on record. The previous record was 9.8 hours in 1978 and 2002 whilst the long term average for spring is 9.3 hours.

Spring monthly mean temperature and sunshine
Element

2007

Long- term Average

Highest

Year

Lowest

YearRecords Commence
Maximum
Temperature (C)
23.8
23.0
24.0
1969/2006
20.0
1971
1897
Minimum
Temperature (C)
11.7
11.6
13.8
1982
10.4
1952/2005
1897
Sunshine
(hours per day)
9.9
9.3
9.8
1978/2002
6.6
1965
1898
Spring rainfall and rain days
Element2007Long-term AverageHighestYearLowestYearRecords Commence
Rainfall (mm)
148.2
156
364.0
1890
34.5
1877
1876
Rain days
27
30.5
48
1898/1926
12
1969
1876

Spring daily extremes
Element2007DateExtremeDate

Records Commence

Highest daily maximum (C)
39.8
12/11/2007
40.3
* Twice
1897
Lowest daily maximum (C)
16.0
27/10/2007
11.4
17/10/1917
1897
Highest daily minimum (C)
21.6
12/10/2007
25.1
24/11/1920
1897
Lowest daily minimum (C)
4.3
10/09/2007
1.5
** Twice
1897
Wettest 24 hours to 9am (mm)
23.6
12/09/2007
68.2
18/10/1995
1876

* Denotes the highest daily maximum temperature recorded on 24 November 1913 and 11 November 2003.

** Denotes the lowest daily minimum temperature recorded on 1 September and 10 September 2005.

Recent springs in Perth
Season
Mean Maximum(C)
Mean Minimum(C)
Total Rainfall (mm)
Rain Days
Mean Sunshine (hours per day)
1994
23.8
11.8
101.6
19
9.7
1995
22.8
11.8
208.0
36
9.2
1996
22.8
12.0
222.2
36
9.1
1997
23.1
11.5
158.6
26
9.0
1998
22.6
11.5
161.8
35
9.4
1999
23.0
11.4
206.6
20
9.7
2000
23.7
11.8
78.4
29
9.7
2001
23.0
11.3
173.4
32
9.0
2002
22.9
11.4
153.6
24
9.8
2003
23.2
11.8
168.2
31
9.6
2004
22.8
11.4
105.8
33
9.4
2005
21.6
10.4
157.2
40
9.2
2006
24.0
12.5
121.2
32
9.2
2007
23.8
11.7
148.2
27
9.8

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 Mt 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 Mt 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.