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Monday 3 July, 2006 MONTHLY CLIMATE SUMMARY - WESTERN AUSTRALIA REGIONAL OFFICE Driest June on record in PerthRainfall - 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.
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. 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.
*Denotes the lowest minimum temperature for June on record on the following dates: 19 June 2003 and 2 June 2004. Climate of Perth in JulyJuly 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.
†Denotes the highest maximum temperature for July on record on the
following dates: 17 & 18 July 1976. 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.
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:
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