Product Code: IDCKGC11L0

Thursday 1 February, 2007

Perth Monthly Climate Summary : January 2007

A cooler than normal month despite the hot finish

Rainfall - above average: The city received 19.2 mm of rainfall over 5 days in January compared with the average of 9 mm over 2 days. Historically, January rainfall has ranged from 0.0 mm in 12 years to 139.0 mm in 2000. Last January Perth registered 28.4 mm rainfall.

Mean daily maximum temperature - below average: Perth's mean daily maximum temperature in January was 29.1°C, compared with the average of 30.4°C. Daily maxima ranged from a cool 19.7°C on the 3rd, which equalled the record for January set in 1939, to a very hot 41.6°C on the 28th, which was the highest daily maximum temperature for January for 9 years.

Perth experienced its longest consecutive run of 40-degree days in January since 1991. During the three day hot spell, daily maximum temperature readings were; 26th 41.2°C, 27th 40.9°C and 28th 41.6°C.

Mean daily minimum temperature - below average: Perth's mean daily minimum temperature in January was 16.6°C, compared with the average of 17.7°C. This was the lowest daily mean minimum temperature recorded at the Perth (Mount Lawley) site, which opened in November 1993. Daily minima ranged from a cool 11.5°C on the 12th to a warm 24.4°C on the 29th, the warmest January night since the 25.6°C on 27 January 1999.

January monthly mean temperature and sunshine
Element

2007

Long- term Average

Highest

Year

Lowest

YearRecords Commence
Maximum
Temperature (°C)
29.1
30.4
34.4
1962
26.3
1939
1897
Minimum Temperature (°C)
16.6
17.7
20.9
1978
15.6
3 years
1897
Sunshine
(hours per day)
10.8
11.6
12.6
1974
8.3
1920
1898
January rainfall and rain days
Element2007Long-term AverageHighestYearLowestYearRecords Commence
Rainfall (mm)
19.2
9
139.0
2000
0.0
12 years
1876
Rain days
5
2
8
1916/90
0
12 Years
1876

January daily extremes
Element2006DateExtremeDate

Records Commence

Highest daily maximum (°C)
41.6
28/01/2007
45.8
31/01/1991
1897
Lowest daily maximum (°C)
19.7
03/01/2007
19.7
19/01/1939
1897
Highest daily minimum (°C)
24.4
29/01/2007
27.8
21/01/1989
1897
Lowest daily minimum (°C)
11.5
12/01/2007
8.9
25/01/2001
1897
Wettest 24 hours to 9am (mm)
13.6
03/01/2007
104.0
22/01/2000
1876

Climate of Perth in February

Like January, February in Perth is typically sunny and warm to hot, though daytime temperatures are slightly higher than those in January on average. A mean of 12 mm of rainfall occurs on two days during the month.

February monthly mean temperatures and sunshine
ElementAverageHighest YearLowest Year

Records
Commence

Maximum temperature (°C)
31.2
35.1
1985
26.5
1926
1897
Minimum temperature (°C)
18.0
22.7
1985
15.6
1931
1897

Sunshine
(hours per day)

11.1
12.0
3 years
7.7
1955
1898
February monthly rainfall and rain days
Element
Average
Highest
Year
Lowest
Year
Records Commence
Rainfall (mm)
12
166.3
1955
0.0
17 years
1876
Rain days
2
8
3 years
0
17 years
1876

February daily extremes
Element
Highest
Date
Lowest
Date
Records Commence
Maximum temperature (°C)
46.2
23/02/1991
19.0
17/02/1914
1897
Minimum temperature (°C)
29.3
* several
8.7
01/02/1902
1897
Rainfall 24 hours to 9am (mm)
120.6
09/02/1992
n/a
n/a
1876

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

Very hot days in February: On average, Perth can expect one day when the maximum temperature is 40 degrees or higher. The highest number of very hot days in February was four in 1933 and 1985. The last time Perth recorded a very hot February day was on 21 February 2006 when 40.1°C was recorded.

Hot days in February: On average, Perth can expect 12 days when the maximum temperature is 32 degrees or higher. The highest number of hot days in February was 23 in 1996. That year also saw the second highest mean maximum temperature for February: 34.6 degrees.

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.