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Wednesday, 1 March 2005

MONTHLY CLIMATE SUMMARY - WESTERN AUSTRALIAN REGIONAL OFFICE

Below average temperatures for Perth in February

Rainfall below average: The city received 3.0 millimetres of rainfall on 3 days compared with the average of 13 mm on 2 days. Since 1876, February rainfall has ranged from 0.0 mm, recorded on 17 occasions, to 166.3 mm in 1955. Last February Perth recorded 2.0 mm on 2 days.

Mean daily maximum temperature below average: Perth's mean daily maximum temperature was 30.0 degrees Celsius making it the lowest mean maximum temperature for February since the 29.0 degrees in 1994. The average is 31.3 degrees. Daily maxima ranged from a mild 23.5 degrees on the 6th and 7th, to a very hot 42.0 degrees on the 15th, the highest daily maximum temperature in February since 1997.

Mean daily minimum temperature below average: Perth's mean daily minimum temperature was 17.0 degrees Celsius, compared to an average of 18.1 degrees. Minima ranged from a cool 13.4 degrees on the 8th, to a warm 22.2 degrees on the 15th.

Mean daily sunshine hours about average: Perth's mean daily sunshine hours was 10.5, which was close to the average of 11.1 hours.

February monthly mean temperature and sunshine
Element

2005

Long- term Average

Highest

Year

Lowest

Year Records Commence
Maximum
Temperature (°C)
30.0
31.3
35.1
1985
26.5
1926
1897
Minimum
Temperature (°C)
17.0
18.1
22.7
1985
15.6
1931
1897
Sunshine
(hours per day)
10.5
11.1
12.0
3 years
7.7
1955
1898
February monthly rainfall and rain days
Element 2005 Long-term Average Highest Year Lowest Year Records Commence
Rainfall (mm)
3.0
13
166.3
1955
0.0
17 years
1876
Rain days
3
2
8
3 years
0
17 years
1876

February daily extremes
Element 2005 Date Extreme Date

Records Commence

Highest daily maximum (°C)
42.0
15/02/2005
46.2
23/02/1991
1897
Lowest daily maximum (°C)
23.5
06 & 07/02/2005
19.0
17/02/1914
1897
Highest daily minimum (°C)
22.2
15/02/2005
29.3
3 days
1897
Lowest daily minimum (°C)
13.4
08/02/2005
8.7
01/02/1902
1897
Wettest 24 hours to 9am (mm)
1.6
27/02/2005
120.6
09/02/1992
1876

Climate of Perth in March

March is generally a little cooler than February. Most days are sunny and warm, but some hot days can occur, particularly in the first half of the month. On average, Perth can expect 19 mm of rainfall on four days, though March has been rainless on several occasions since records began.

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

Records
Commence

Maximum
temperature (°C)
29.2
31.8
1978
24.4
1927
1897
Minimum
temperature (°C)
16.3
20.0
1988
13.0
1900
1897
Sunshine
(hours per day)
9.5
10.6
2001
5.5
1927
1898
March monthly rainfall and rain days
Element
Average
Highest
Year
Lowest
Year
Records Commence
Rainfall (mm)
19
145.2
1934
0.0
6 years
1876
Rain days
4
10
1915
0
6 years
1876

March daily extremes
Element
Highest
Date
Lowest
Date
Records Commence
Maximum temperature (°C)
42.3
05/03/1990
16.4
27/03/1968
1897
Minimum temperature (°C)
28.3
02/03/1934
7.6
24/03/2001
1897
Rainfall 24 hours to 9am (mm)
77.0
09/03/1934
n/a
n/a
1876

Hot days in March: On average, Perth can expect about eight days when the maximum temperature is 32 degrees or higher. The greatest number of such hot days in March was 17 in 1983.

Days 40 degrees or higher in March: Daily maximum temperatures of 40 degrees or above are uncommon in Perth in March, but occur on approximately one day every two years. The most recent event was 22 March 2004 when Perth experienced 41.4 degrees. The latest of the season was on 23 March 1920 when the daily maximum temperature reached 40.0 degrees.

March top 10 hottest
March top 10 coolest
Position
Date
Max
temp (°C)
Position
Date
Max
temp (°C)
1
05 March 1990
42.3
1
27 March 1968
16.4
2
10 March 2003
42.0
2
26 March 1960
17.6
3
21 March 1988
41.7
3
27 March 1908
18.1
4
01 March 1991
41.4
4
28 March 1971
18.2
4
22 March 2004
41.4
5
28 March 1964
18.4
6
14 March 1922
41.3
6
19 March 1905
18.6
7
06 March 1914
41.2
6
10 March 1926
18.6
8
13 March 1922
41.1
6
19 March 1984
18.6
8
15 March 1922
41.1
9
29 March 1920
18.7
10
13 March 1964
41.0
10
29 March 1997
18.9

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), or John Cramb tel: (08) 9263 2222.


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