Adelaide Metro & Hills in August 2013: A warm and wet finish to winter

This statement was prepared before all data for the period were available. This may affect some of the statistics presented.
  • Rainfall was average tending above average across the Adelaide region
  • Warm days and nights for most locations

Rainfall

The August 2013 rainfall total at Adelaide (Kent Town) was 84.4 mm received on 21 rain days. This is above the long-term average of 68.8 mm typically received on 16 rain days; the long-term median rainfall for August at Adelaide (Kent Town) is 73.7 mm. By comparison, during August 2012, 68.0 mm was recorded, and 92.4mm in August 2011.

The wettest days for the Adelaide and Hills regions occurred between the 17th and 24th of the month. On the 17th a deep low pressure system well south of SA was responsible for a broad and vigorous northwest to westerly airstream across the southern half of the State. A cold front embedded in this airstream brought periods of heavy showers and thunderstorms. Isolated showers and thunderstorms continued through to the 24th in the moist westerly airstream that followed the passage of the low pressure system. Daily rainfall totals in excess of 10mm were observed across the Adelaide Plains while higher values, greater than 20mm, were observed about the Hills.

Monthly rainfall totals for August 2013 across the Adelaide metro and Hills region were generally above average; typically ranging from 60 to 80mm on the Adelaide Plains, with higher totals in the in excess of 120 mm throughout the Adelaide Hills. The wettest location for the month was at Mount Lofty where 183.0mm was recorded for the month, over 100 mm of which occurring in between the 17th and 24th, with the wettest day being on the 22nd when 28.4 mm was observed.

Note that the Adelaide official climate rainfall record is taken from the manually observed 203mm rain gauge at the Kent Town site in Adelaide. These figures may differ from totals on some Bureau of Meteorology web pages as these may be from automatic tipping bucket rain gauge readings.

Temperature

Both maximum and minimum temperatures were generally tending above average across the Adelaide metro and Hills regions through August 2013. With respect to minimum (over night) temperatures, the warmest period occurred at the end of the month as northerly winds were directed across the state ahead of a trough of low pressure. Daytime temperatures in the Adelaide regions were also warmest at the end of the month; Adelaide Kent Town observed the warmest day for any location across the region on the 31st with a maximum of 25.8 °C, which was Adelaide’s warmest August day in 4 years. The warmest days on average were at Parafield Airport with a monthly average of 17.3 °C.

The average maximum temperature recorded at Adelaide (Kent Town) for August 2013 was 17.2 °C, 0.6°C above the long-term August mean maximum temperature, and the warmest August since 2011. In comparison, August 2012 saw average maximum temperatures of 15.9°C at Adelaide (Kent Town). The record warmest August mean maximum in Adelaide is 19.9°C recorded in 1982 at Kent Town and in 1914 at the West Terrace site.

The coldest day of the month for any location in the Adelaide and Hills region was reported at Mount Lofty on the 19th when the maximum reached 6.4 °C; Adelaide (Kent Town) recorded its coldest day on the 21st, reaching a maximum of just 12.5 °C. The coolest days on average for the month were at Mount Lofty with an August average maximum temperature of 11.1 °C.

Mean minimum temperatures were above average across the Adelaide Plains and Hills this August, with the minimum temperature at Adelaide (Kent Town) being 9.1°C, 0.9 °C above the long term August average, and Adelaide’s warmest August nights in 2 years. The coldest night during August 2013 in the Adelaide and Hills area was 1.5 °C observed at Parafield Airport on the 1st, Adelaide (Kent Town) also had its coldest morning on the 1st, observing a minimum of 4.1 °C.  The coolest nights on average were recorded at Mount Lofty with 6.1 °C. The warmest night was 14.2°C at Adelaide Airport on the 29th. Noarlunga recorded the warmest nights overall with a monthly average of 10.1 °C

Some sites had their highest August mean daily minimum temperature on record.

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Extremes in August 2013
Hottest day 25.8 °C at Adelaide (Kent Town) on the 31st
Warmest days on average 17.3 °C at Parafield Airport
Coolest days on average 11.1 °C at Mount Lofty
Coldest day 6.4 °C at Mount Lofty on the 19th
Coldest night 1.5 °C at Parafield Airport on the 1st
Coolest nights on average 6.1 °C at Mount Lofty
Warmest nights on average 10.1 °C at Noarlunga
Warmest night 14.2 °C at Adelaide Airport on the 29th
Warmest on average overall 13.2 °C at Adelaide (Kent Town)
13.2 °C at Noarlunga
Coolest on average overall 8.6 °C at Mount Lofty
Wettest overall 183.0 mm at Mount Lofty
Driest overall 61.8 mm at Edinburgh RAAF
Wettest day 28.4 mm at Mount Lofty on the 22nd
Highest wind gust 78 km/h at Adelaide Airport on the 16th
78 km/h at Mount Lofty on the 16th

Record highest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2013 (°C)
Previous warmest
for August
Years of
record
Average for
August
Mount Barker 7.2 6.8 in 1945 113 5.0
Adelaide Airport 9.2 9.0 in 1959 58 7.5



Summary statistics for August 2013
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2013
Diff
from
average
Highest for
August
2013
Mean for
August
2013
Diff
from
average
Lowest for
August
2013
Total for
August
2013
Average
for
August
Rank of
August
2013
Fraction of
August
average
Adelaide (Kent Town) 17.2 +0.6 25.8 31st 9.1 +0.9 4.1 1st 84.4 68.8 average 123%
Adelaide Airport 16.7 +0.8 25.3 31st 9.2 +1.7 3.5 1st 62.2 50.5 average 123%
Edinburgh RAAF 17.0 +0.5 24.5 31st 7.6 +1.1 2.6 20th 61.8 50.0 average 124%
Mount Barker 14.9 +0.7 23.2 31st 7.2 +2.2 2.3 1st 126.2 102.5 high 123%
Mount Lofty 11.1   19.8 31st 6.1   2.3 20th 183.0
Noarlunga 16.3   24.6 31st 10.1   5.0 1st 73.0
Parafield Airport 17.3 +1.0 25.0 31st 7.9 +1.2 1.5 1st 65.0 54.1 average 120%

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 12 pm on Sunday 1 September 2013. 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

Further information

Media
(03) 9669 4057
Enquiries