Adelaide Metro & Hills in August 2011: Warm and Wet on the plains.

  • Hot August nights in Adelaide, and above average maximum temperatures.
  • Above average rainfall over the Adelaide plains, tending drier than average in the hills.

Rainfall

The total rainfall recorded at Adelaide (Kent Town), for August 2011 was 92.4 mm, which is well above the long-term average of 68.2 mm. The highest August rainfall for Adelaide, either at West Terrace or Kent Town occurred in 1852 with 157.7 mm. Much of the rain for August 2011 occurred in the first half of the month, though 22.6 mm was recorded in a single rainfall event on the 17th. The average number of rain days at Kent Town for August is 16; in August 2011 there were 14 rain days, compared with 23 rain days in August 2010, when total rainfall was 115.2.

Note that the rainfall readings used here for Adelaide climate records are from the Kent Town regional office site manual gauge. Some Adelaide rainfall totals on some Bureau of Meteorology web pages may differ as they are from automatic rainfall recordings.

Most of the Adelaide plains received rainfall totals between 50 and 100 mm, typically very close to or above average for August at individual locations. In the Adelaide Hills rainfall totals were generally closer to 100mm, though tending to be slightly below average for August. Several locations did record in excess of 120 mm, with the highest rainfall total being 148.8 mm at Crafers (Mount Lofty).

For the first eight months of the year 405.0 mm has been recorded at Adelaide (Kent Town), slightly above the long-term average of 384.2 mm for the same period. Rainfall totals for the year so far are above average, typically by 20 to 50mm, across the wider Adelaide Plains but tend to be running 20 to 50mm below average through the Adelaide hills.

Some sites had their highest August mean daily minimum temperature for at least 25 years.

Temperature

Maximum temperatures were above average over the Adelaide metropolitan and hills area this August. At Adelaide (Kent Town) the mean maximum temperature for August was 18.0 C, which is 1.4 C above the long-term mean of 16.6 C, and the warmest August since 2009 for Adelaide. Last year, in contrast, was 1.5 C below the long-term August mean maximum temperature.

A run of days with maximum temperatures well above average occurred at the beginning of August 2011, followed by another period of warmer than average days in the last week of the month. Parafield Airport averaged 18.2C as the warmest location this August, compared with 12.0C at the coolest location, Mount Lofty, which also had the coldest daytime maximum temperature of 7.7C on the 8th. The hottest maximum temperature recorded in the Adelaide metropolitan and hills area was 25.8 C at Edinburgh Airport on the 3rd.

Minimum temperatures were above average to very much above average across the Adelaide metropolitan and hills area this August. The mean minimum temperature for August 2011 at Adelaide (Kent Town) was 9.2 C, which is 1.0 C above the long-term August mean minimum temperature of 8.2 C. This is the highest August average minimum temperature since 2009 when 9.4C was recorded. In August last year, the mean minimum temperature was 8.0 C.

The coldest minimum temperature recorded in the Adelaide metropolitan and hills area was 1.2 C on the 31st at Mount Barker, whilst the warmest night was 14.9 C at Noarlunga on the 1st.

Further information

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Extremes in August 2011
Hottest day 25.8 °C at Edinburgh RAAF on the 3rd
Warmest days on average 18.2 °C at Parafield Airport
Coolest days on average 12.0 °C at Mount Lofty
Coldest day 7.7 °C at Mount Lofty on the 8th
Coldest night 1.2 °C at Mount Barker on the 31st
Coolest nights on average 6.7 °C at Mount Barker
Warmest nights on average 9.9 °C at Noarlunga
Warmest night 14.9 °C at Noarlunga on the 1st
Warmest on average overall 13.7 °C at Adelaide (Kent Town)
Coolest on average overall 9.5 °C at Mount Lofty
Wettest overall 149.6 mm at Crafers (Mt Lofty)
Highest wind gust 69 km/h at Noarlunga on the 16th
69 km/h at Mount Lofty on the 17th

Highest August mean daily minimum temperature for at least 25 years
Mean daily minimum
temperature
for August 2011 (°C)
Most recent August
at least this warm
Years since
warmer
Average for
August
Mount Barker 6.7 6.8 in 1945 66 4.9



Summary statistics for August 2011
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2011
Diff
from
average
Highest for
August
2011
Mean for
August
2011
Diff
from
average
Lowest for
August
2011
Total for
August
2011
Average
for
August
Rank of
August
2011
Fraction of
August
average
Adelaide (Kent Town) 18.0 +1.4 24.6 3rd 9.2 +1.0 5.4 28th 92.4 68.9 high 134%
Adelaide Airport 17.3 +1.4 23.7 3rd 8.2 +0.7 4.0 31st 57.4 50.2 average 114%
Edinburgh RAAF 17.7 +1.2 25.8 3rd 7.1 +0.6 2.1 30th 62.4 50.0 average 125%
Mount Barker 15.5 +1.3 23.0 3rd 6.7 +1.8 1.2 31st 79.8 102.4 average 78%
Mount Lofty 12.0   19.1 3rd 6.9   3.3 30th 124.8
Noarlunga 17.2   22.3 3rd 9.9   6.1 30th 28.8
Parafield Airport 18.2 +2.0 25.6 3rd 7.4 +0.7 1.9 30th 55.6 54.0 average 103%

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Adelaide Metro & Hills using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

This statement has been prepared based on information available at 3 pm on Wednesday 31 August 2011. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 20 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

Media
(03) 9669 4057
Enquiries