Perth Monthly Climate Summary: October 2006
Dry and warm October for Perth

Wednesday 1 November, 2006

October Rainfall - below average: The city received 18.6 mm of rainfall over 7 days in October compared with the average of 53 mm over 9 days. Last October Perth registered 52.8 mm on 16 days.

Ten-month rainfall - record low: The total rainfall for January to October for Perth this year was 445.4 mm on 87 days, making it the driest such period on record for Perth. The previous driest was 458.5 mm on 94 days in 1914. The average is 824 mm.

Perth's top 10 driest years to date
(January to October total)
Season
Rainfall (mm)
Rain Days
Ranking
2006
445.4
87
1
1914
458.5
94
2
1940
493.2
89
3
1877
511.6
98
4
1979
529.8
100
5
1969
531.2
79
6
1894
559.7
95
7
1959
567.4
106
8
1911
597.3
96
9
1881
580.4
86
10

Mean daily maximum temperature - above average: Perth's mean daily maximum temperature in October was 24.1°C, making it the highest mean daily maximum temperature for October since 1969 and the equal second warmest on record. The October average is 22.7°C. Daily maxima ranged from a cool 17.8°C on the 11th to a warm 31.9°C on the 28th, the warmest daily maximum temperature for October for six years.

Mean daily minimum temperature - near average: Perth's mean daily minimum temperature in October was 11.9°C, compared with the average of 11.1°C. Daily minima ranged from a cool 5.4°C on the 5th to a warm 20.2°C on the 21st, the warmest daily minimum temperature in October for fifteen years and the sixth warmest October night on record.

October monthly mean temperature and sunshine
Element

2006

Long- term Average

Highest

Year

Lowest

Year Records Commence
Maximum
Temperature (°C)
24.1
22.7
25.8
1969
18.8
1924
1897
Minimum
Temperature (°C)
11.9
11.1
14.2
1969
9.3
1910
1897
Sunshine
(hours per day)
9.8
9.6
10.9
2000
5.5
1898
1898
October rainfall and rain days
Element 2006 Long-term Average Highest Year Lowest Year Records Commence
Rainfall (mm)
18.6
53
199.9
1890
1.0
1969
1876
Rain days
7
9
22
1898
1
1969
1876

October daily extremes
Element 2006 Date Extreme Date

Records Commence

Highest daily maximum (°C)
31.9
28/10/2006
37.3
29/10/1967
1897
Lowest daily maximum (°C)
17.8
11/10/2006
11.9
08/10/1932
1897
Highest daily minimum (°C)
20.2
21/10/2006
22.2
29/10/1979
1897
Lowest daily minimum (°C)
5.4
05/10/2006
2.2
06/10/1994
1897
Wettest 24 hours to 9am (mm)
6.6
12/10/2006
68.2
18/10/1995
1876

Climate of Perth in November

November days in Perth are generally sunny and either mild or warm. A few hot days occur, usually in the latter part of the month. The general springtime decline in rainfall continues with an average of 22 mm over six days in November in Perth.

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

Records
Commence

Maximum temperature
(°C)
26.1
27.7
1920
21.5
1971
1897
Minimum temperature
(°C)
14.1
16.9
1982
11.9
1954
1897

Sunshine
(hours per day)

10.7
11.9
2002
5.1
1965
1898
November rainfall and rain days
Element
Average
Highest
Year
Lowest
Year
Records Commence
Rainfall (mm)
22
73.2
1984
0.0
1891
1876
Rain days
6
14
3 years
0
1891
1876

November daily extremes
Element
Highest
Date
Lowest
Date
Records Commence
Maximum temperature (°C)
40.3
** Twice
15.8
02/11/1919
1897
Minimum temperature (°C)
25.1
24/11/1920
5.0
18/11/2004
1897
Rainfall 24 hours to 9am (mm)
39.1
29/11/1956
n/a
n/a
1876

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

Hot days in November: On average, Perth can expect four hot days when the maximum temperature is 32 degrees or higher. The record of nine such days was set in 1940 whilst last November Perth recorded two such days.

Earliest 40-degree day of the season: The earliest 40-degree maximum temperature of the season occurred on 11 November 2003, when 40.3 degrees was recorded. A maximum temperature of 40 degrees or higher has only occurred three times in November in Perth since records began.


November top 10 hottest days
November top 10 coolest days
Position
Date
Max
temp°C
Position
Date
Max
temp°C
1
24 November 1913
40.3
1
02 November 1919
15.8
1
11 November 2003
40.3
2
12 November 1976
15.9
3
22 November 1978
40.1
2
16 November 1983
15.9
4
24 November 1962
39.9
4
08 November 1995
16.0
5
26 November 1972
39.6
5
10 November 1971
16.1
6
15 November 1942
39.5
6
01 November 1904
16.2
7
01 November 1936
39.4
6
03 November 1953
16.2
7
24 November 1936
39.4
8
03 November 1969
16.3
9
30 November 1925
38.9
9
13 November 1922
16.4
10
22 November 1977
38.7
9
15 November 1948
16.4

November top 10 warmest nights
November top 10 coldest nights
Position
Date
Min
temp°C
Position
Date
Min
temp°C
1
24 November 1920
25.1
1
18 November 2004
5.0
2
23 November 1937
24.5
2
01 November 1904
5.6
3
30 November 1925
24.4
2
02 November 2005
5.8
3
23 November 2004
24.4
4
01 November 1968
6.2
5
26 November 1972
24.3
4
06 November 2005
6.2
6
27 November 1972
23.7
6
03 November 1907
6.3
7
10 November 1967
23.6
7
02 November 1907
6.6
8
22 November 1978
23.5
7
03 November 1948
6.6
9
27 November 1973
23.4
9
07 November 1948
6.8
9
12 November 2003
23.4
10
02 November 1943
6.9

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