Tuesday, 1 December 2009 - Seasonal Climate Summary for Perth - Product Code: IDCKGC21L0

Average spring in Perth

Rainfall - near average: This spring the rainfall in Perth was near average. From September to November, Perth received 125.2 mm over 37 days, compared with the average of 156 mm on about 31 days. This was Perth's driest spring since 2006, then 121.2 mm on 32 days. Last spring, Perth recorded 172.0 mm over 39 days. Rainfall totals for individual months this spring were: September 80.2 mm (average 81 mm), October 6.8 (average 53 mm) and November 38.2 mm (average 22 mm). The wettest day during spring was on the 19th November when 22.4 mm of rain was recorded.

Mean daily maximum temperature - near average: The mean daily maximum temperature for Perth this spring was 22.8°C, compared with the average of 23.1°C. Daily values this spring ranged from a cold 13.9°C on 29th September to a hot 36.9°C on 17th October. Last spring the mean daily temperature was 22.7°C.

Mean daily minimum temperature - near average: The mean daily minimum temperature for Perth this spring was 12.0°C, compared with the average of 11.6°C. Daily minima ranged from a cold 3.1°C on 4th September to a warm 20.2°C on 12th November. Last spring the mean daily minimum temperature was 11.4°C.

Mean daily sunshine hours - below average: Perth's mean daily sunshine this spring was 8.8 hours, the average daily sunshine for spring is 9.3 hours. Last spring the mean daily sunshine was also 8.8 hours.

Spring monthly mean temperature and sunshine
Element

2009

Long- term Average

Highest

Year

Lowest

Year Records Commence
Maximum
Temperature (°C)
22.8
23.1
24.0
1969/2006
20.0
1971
1897
Minimum
Temperature (°C)
12.0
11.6
13.8
1982
10.4
1952/2005
1897
Sunshine
(hours per day)
8.8
9.3
9.9
2007
6.6
1965
1898
Spring rainfall and rain days
Element 2009 Long-term Average Highest Year Lowest Year Records Commence
Rainfall (mm)
125.2
156
364.0
1890
34.5
1877
1876
Rain days
37
30.8
48
1898/1926
12
1969
1876

Spring daily extremes
Element 2009 Date Extreme Date

Records Commence

Highest daily maximum (°C)
36.9
17/10/2009
40.3
* Twice
1897
Lowest daily maximum (°C)
13.9
29/09/2009
11.4
17/09/1917
1897
Highest daily minimum (°C)
20.2
12/11/2009
25.1
24/11/1920
1897
Lowest daily minimum (°C)
3.1
04/09/2009
1.0
22/11/2008
1897
Wettest 24 hours to 9am (mm)
22.4
19/11/2009
68.2
18/10/1995
1876
* Denotes the highest daily maximum temperature recorded on 24 November 1913 and 11 November 2003.

Recent springs in Perth 2000−2009
Season
Mean Maximum(°C)
Mean Minimum(°C)
Total Rainfall (mm)
Rain Days
Mean Sunshine (hours per day)
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
9.9
2008
22.7
11.4
172.0
39
8.8
2009
22.8
12.0
125.2
37
8.8

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 Yanhui Blockley tel: (08) 9263 2222 on weekdays.