Perth Monthly Climate Summary: June 2006
Driest June on Record

Monday 3 July, 2006

Rainfall - record low: The city received 24.6 mm of rainfall over 5 days in June compared with the average of 179 mm over 17 days. This was Perth's driest June in terms of rainfall total as well as rain days, since records commenced in 1876. The previous record low June rainfall total was 54.9 mm in 1877, whilst the previous lowest number of rain days in June was 9 days in 1893 and 1976. The wettest day in June 2006 was the 28th when 12.4 mm was recorded. Historically, the wettest June on record was in 1945 with 476.1 mm. Last June Perth registered 251.0 mm on 19 days.

Perth's top 10 driest Junes
Season
Rainfall (mm)
Rain Days
Ranking
2006
24.6
5
1
1877
54.9
10
2
1993
64.4
10
3
1989
68.0
10
4
1958
70.4
11
5
2001
71.6
12
6
1977
74.6
13
7
1893
81.8
9
8
1976
84.8
9
9
1955
87.6
10
10

Six-monthly rainfall - record low: The total rainfall for January to June this year was 134.6 mm, making it the driest start to the year on record. The previous record was 188.0 mm in 1972. The average is 384 mm.

Two-monthly rainfall - record low: The total rainfall for May to June this year was 55.6 mm, making it the driest May-June period on record. The previous record was 118.6 mm in 1949. The average is 299 mm.

Mean daily maximum temperature - well above average: Perth's mean daily maximum temperature in June was 20.3°C, compared with the average of 19.1°C. This was the highest mean daily maximum temperature for June since the 20.3°C in 1985 and the equal third warmest on record. Daily maxima ranged from a cool 15.8°C on the 28th to a warm 24.1°C on the 5th.

Mean daily minimum temperature - record low: Perth's mean daily minimum temperature in June was 5.8°C, compared with the average of 8.9°C. This was the lowest mean daily minimum temperature recorded for June at the official Perth metropolitan observation site at Mt Lawley since records commenced there in 1994. The previous record was 6.9°C in 2001. Minima ranged from a very cold −0.7°C on the 17th, the lowest ever daily minimum temperature recorded at the Mt Lawley site, to a mild 11.5°C on the 20th. The previous June record low minimum was 1.2°C on 19 June 2003 and 2 June 2004 whilst the record minimum for any month had been 0.0°C on 15 July 1997 and 27 July 1998.

Cold nights - new record: Perth recorded 13 cold nights this June with a minimum temperature of 5 degrees or less, the most ever for the Mt Lawley site. The previous record was 12 in 2001.

Mean daily sunshine hours - new record: Perth's mean daily sunshine hours in June was 7.4 hours, the most sunshine for June on record. The previous record was 7.3 hours in 2001, compared with the average of 5.7 hours.

June monthly mean temperature and sunshine
Element

2006

Long- term Average

Highest

Year

Lowest

Year Records Commence
Maximum
Temperature (°C)
20.3
19.1
20.6
1983
15.9
1898
1897
Minimum
Temperature (°C)
5.8
8.9
12.8
1964
6.9
2001
1897
Sunshine
(hours per day)
7.4
5.7
7.3
2001
2.9
1945
1898
June rainfall and rain days
Element 2006 Long-term Average Highest Year Lowest Year Records Commence
Rainfall (mm)
24.6
179
476.1
1945
54.9
1877
1876
Rain days
5
17
27
1918/70
9
1893/1976
1876

June daily extremes
Element 2006 Date Extreme Date

Records Commence

Highest daily maximum (°C)
24.1
05/06/2006
28.1
05/06/1975
1897
Lowest daily maximum (°C)
15.8
28/06/2006
8.8
26/06/1956
1897
Highest daily minimum (°C)
11.5
20/06/2006
18.7
12/06/1988
1897
Lowest daily minimum (°C)
−0.7
17/06/2006
1.2
*Twice
1897
Wettest 24 hours to 9am (mm)
12.4
28/06/2006
99.1
10/06/1920
1876

*Denotes the lowest minimum temperature for June on record on the following dates: 19 June 2003 and 2 June 2004.

Climate of Perth in July

July is one of Perth's coldest and wettest months. Many days are cloudy, wet and windy, though there are generally some sunny days with light winds and cold nights.

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

Records
Commence

Maximum temperature
(°C)
18.3
19.9
1976/77
15.7
1910
1897
Minimum temperature
(°C)
8.0
11.4
1921
5.3
1997
1897

Sunshine
(hours per day)

6.1
7.5
1918
3.2
1926
1898
July rainfall and rain days
Element
Average
Highest
Year
Lowest
Year
Records Commence
Rainfall (mm)
171
425.1
1958
61.5
1876
1876
Rain days
17
29
1946
6
1918
1876

July daily extremes
Element
Highest
Date
Lowest
Date
Records Commence
Maximum temperature (°C)
26.3
†Twice
10.5
09/07/1906
1897
Minimum temperature (°C)
16.1
12/07/1898
0.0
††Twice
1897
Rainfall 24 hours to 9am (mm)
95.0
29/07/1987
n/a
n/a
1876

†Denotes the highest maximum temperature for July on record on the following dates: 17 & 18 July 1976.

††Denotes the lowest minimum temperature for July on record on the following dates: 15 July 1997 and 27 July 1998.

Warm days in July: On average, Perth can expect six days when the maximum temperature is 20 degrees or more. The greatest number of such days in July was 14 days in 1976 and 1977. Last July, Perth recorded eight such days.

Cold days in July: On average, Perth can expect two days when the maximum temperature is 15 degrees or less. The greatest number of such days in July was 12 in 1916. Last July, Perth recorded two such days.

Cold nights in July: Perth has a mean of eight cold nights when the minimum temperature is 5 degrees or lower. The greatest number of such nights was 16 in 1998. Last July, Perth recorded ten such nights.

July top 10 warmest days
July top 10 coldest days
Position
Date
Max
Temp °C
Position
Date
Max
Temp °C
1
17 July 1976
26.3
1
09 July 1906
10.5
1
18 July 1976
26.3
2
12 July 1899
10.6
3
21 July 1994
25.8
3
16 July 1909
11.2
4
24 July 1999
25.4
4
17 July 1925
11.3
5
19 July 1976
25.2
4
12 July 1927
11.3
6
16 July 1976
25.0
6
29 July 1975
11.4
7
31 July 1977
24.8
7
04 July 1939
11.5
7
26 July 2001
24.8
7
21 July 1978
11.5
9
21 July 1921
24.7
9
30 July 1948
11.6
10 14 July 1950 24.6 10 09 July 1905 11.7

July top 10 warmest nights
June top 10 coldest nights
Position
Date
Min
Temp °C
Position
Date
Min
Temp °C
1
12 July 1898
16.1
1
15 July 1997
0.0
2
03 July 1915
15.7
1
27 July 1998
0.0
2
07 July 1928
15.7
3
29 July 1998
0.1
4
18 July 1919
15.6
4
11 July 1997
0.2
4
19 July 1919
15.6
4
07 July 2005
0.2
4
15 July 1978
15.6
4
12 July 2005
0.2
7
17 July 1908
15.5
7
07 July 1998
0.3
7
02 July 1941
15.5
8
08 July 1997
0.4
9 02 July 1921 15.4 8 26 July 2004 0.4
9
30 July 2001
15.4
10
18 July 1997
0.5
- - - 10 06 July 2005 0.5

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 John Cramb Western Australia Climate Services Centre
on, tel: (08) 9263 2222, office hours.