Adelaide Metro & Hills in August 2014: Dry with cold nights

August was very dry across the Adelaide region, with rainfall generally very much below average for most locations. The Kent Town office recorded 20.8 mm (30% of the long-term August average) on just 5 rain days, against the August average of 16 days. The heaviest rainfall event occurred on 1 August, when a vigorous cold front to the south of the Great Australian Bight produced isolated squally showers and strong wind gusts across the Adelaide region, delivering daily totals in excess of 15 mm for most locations. Monthly rainfall totals were generally between 10 and 20 mm across metropolitan locations while locations in the Adelaide Hills received totals in excess of 30 mm. The wettest location was Heathfield Works Depot, in the Adelaide Hills, with a monthly total of 48.2 mm, with 40.6 mm observed in the 24 hours to 9am on 1 August.

Monthly mean maximum temperatures were above average while minimum temperatures were below average across the Adelaide metro and hills region, with most locations observing particularly cold nights. A run of cold nights during the first week of August saw Adelaide observed 0.9°C on August 4, which is only the second time that Adelaide had seen a daily August minimum temperature that cold, the previous being August 7, 1888. Mount Barker recorded the coldest night on the 4th, with a minimum of just -1.4 °C, which was the coldest August night for Mount Barker in 8 years. The cold nights resulted in several locations observing their lowest August mean daily minimum temperature on record.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in August 2014
Hottest day 25.2 °C at Parafield Airport on the 30th
Warmest days on average 17.6 °C at Parafield Airport
Coolest days on average 11.8 °C at Mount Lofty
Coldest day 6.3 °C at Mount Lofty on the 1st
Coldest night -1.4 °C at Mount Barker on the 4th
Coolest nights on average 3.8 °C at Edinburgh RAAF
Warmest nights on average 7.8 °C at Noarlunga
Warmest night 15.5 °C at Noarlunga on the 31st
Warmest on average overall 12.1 °C at Adelaide (Kent Town)
12.1 °C at Noarlunga
Coolest on average overall 8.5 °C at Mount Lofty
Wettest overall 48.2 mm at Heathfield Works Depot
Driest overall 0 mm at Uraidla (Sutton Creek)
Wettest day 40.6 mm at Heathfield Works Depot on the 1st
Highest wind gust 89 km/h at Adelaide Airport on the 1st

Record lowest total August rainfall
Total rainfall
for August 2014 (mm)
Previous driest
for August
Years of
record
Average for
August
Willunga 10.6 11.0 in 1944 152 79.3
Williamstown (South Para Reservoir) 20.8 23.4 in 2006 47 92.4

Lowest total August rainfall for at least 25 years
Total rainfall
for August 2014 (mm)
Most recent August
at least this dry
Years since
drier
Average for
August
Williamstown 17.8 11.2 in 1944* 69 91.3
Uraidla 42.0 29.0 in 1974 40 144.8
Cudlee Creek (Millbrook Reservoir) 33.0 31.6 in 1982 32 117.1
Ashton Co-op 26.0 0.0 in 1982* 31 135.4

* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported.




Record lowest August temperature
Lowest temperature
in August 2014 (°C)
Previous coolest
for August
Years of
record
Average for
August
Adelaide (Kent Town) 0.9 on the 4th 1.6 on the 10th in 1994 38 8.2



Record lowest August mean daily minimum temperature
Mean daily minimum
temperature
for August 2014 (°C)
Previous coolest
for August
Years of
record
Average for
August
Adelaide Airport 5.5 5.6 in 1967 59 7.6
Parafield Airport 4.2 4.8 in 2008 57 6.7
Edinburgh RAAF 3.8 4.6 in 1978 41 6.5



Summary statistics for August 2014
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2014
Diff
from
average
Highest for
August
2014
Mean for
August
2014
Diff
from
average
Lowest for
August
2014
Total for
August
2014
Average
for
August
Rank of
August
2014
Fraction of
August
average
Adelaide (Kent Town) 17.4 +0.8 25.0 30th 6.8 -1.4 0.9 4th 20.8 68.0 v low 31%
Adelaide Airport 16.1 +0.2 23.2 30th 5.5 -2.1 0.5 4th 14.6 49.9 v low 29%
Edinburgh RAAF 17.1 +0.6 24.6 29th 3.8 -2.7 -0.7 4th 12.2 49.1 v low 25%
Kuitpo Forest Reserve 14.1   21.7 29th 6.4   1.3 2nd 29.0
Mount Barker 15.9 +1.7 24.8 30th 4.0 -1.0 -1.4 4th 28.4 102.1 v low 28%
Mount Crawford (Mt Crawford AWS) 13.2   20.7 29th 6.0   2.2 11th 24.0 83.5 low 29%
Mount Lofty 11.8   19.1 29th 5.2   0.7 12th 36.0
Noarlunga 16.3   23.2 30th 7.8   3.4 4th 4.6
Parafield Airport 17.6 +1.3 25.2 30th 4.2 -2.5 -1.3 4th 14.2 53.5 v low 27%

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.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 10 am on Monday 1 September 2014. 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