Monday, 2 May 2011 - Monthly Climate Summary for South Australia - Product code IDCKGC23R0
South Australia has received about a quarter of the April rainfall average for the state as a whole. Most locations received below average April rainfall across the state, with a few areas seeing close to average rainfall (though still on the low side), predominantly in the southeast. Nullarbor was the only area to have above average rainfall for April with a total of 29.6 mm against the long-term April average of 22.2 mm.
South Australia has had its second wettest first four months of the year (January to April) on record. January to March this year was the wettest first 3 months of the year on record, but with below average rainfall in April 2011 the year to date state average has slipped to second place. The wettest first four months of the year was in 1974.
Rainfall totals over the pastoral districts were below average; with totals ranging up to only about 7 mm. Zero rainfall was recorded at a number of locations. The wettest overall was Woomera Aerodrome with 6.6 mm.
Rainfall totals were generally below average across the agricultural districts. In the Lower Southeast totals approached the April average, but were still slightly below. Rainfall totals were around 5mm in the Upper North, Upper Murray Valley and Murray Mallee districts, increasing to about 10 to 20 mm over most other agricultural districts, and up to 30 mm in the Mount Lofty Ranges and the Lower Southeast. The wettest overall was Mount Gambier Aero with 54.2 mm.Some sites had their lowest total April rainfall on record. Some sites had their lowest total April rainfall for at least 25 years. See a map of rainfall deciles.
The mean temperature (the average of the maximum and minimum temperatures) for South Australia as a whole in April 2011 was 19.0 °C, which is 0.6 °C below the long-term average.
The area-averaged mean maximum temperature of 26.3°C was 0.3°C below the long-term April average for South Australia as a whole.
Mean maximum temperatures over South Australia were generally within 1°C of the long-term average.
Average daily maximum temperatures over the pastoral districts ranged from 23.6°C at Yunta in the Northeast district to 28.8°C at Moomba Airport in the Far North district. The highest recorded maximum temperature for April was 34.7°C at Marree on the 7th of the month.
Average daily maximum temperatures across the agricultural areas ranged from 16.7°C at Mount Lofty to 26.3°C at Port Augusta Aero in the Western Agricultural District. The lowest recorded maximum temperature for April was 10.2°C at Mount Lofty on the 10th of the month, with the warmest day recorded at Ceduna with 34.8°C on the 8th.
Mean minimum temperatures were up to 2 °C below average across parts of northern South Australia this April and generally within 1 °C of average elsewhere.
Over the Pastoral districts average minimum temperatures ranged from 8.0°C at Yunta in the Northeast District to 13.2°C at Oodnadatta Airport in the Far North District. The lowest overnight minimum temperature in the pastorals for April was 2.8°C at Yunta on the 12th and the 25th, whilst the highest was 19.5°C recorded at Marree Comparison on the 8th.
Over the agricultural areas average overnight minimum temperatures ranged from 6.6°C at Yongala to 15.2°C at Neptune Island. The lowest recorded daily minimum temperature for April in the Agricultural districts was 1.2°C at Robe on the 18th, whilst the highest was 21.7 °C at Noarlunga on the 8th.Some sites had their lowest April mean daily minimum temperature for at least 25 years.
|Extremes in April 2011|
|Hottest day||34.8 °C at Ceduna AMO on the 8th|
|Warmest days on average||28.8 °C at Moomba Airport|
|Coolest days on average||16.7 °C at Mount Lofty|
|Coldest day||10.2 °C at Mount Lofty on the 10th|
|Coldest night||1.2 °C at Robe Airfield on the 18th|
|Coolest nights on average||6.6 °C at Yongala|
|Warmest nights on average||15.2 °C at Neptune Island|
|Warmest night||21.7 °C at Noarlunga on the 8th|
|Warmest on average overall||20.8 °C at Moomba Airport|
|Coolest on average overall||13.1 °C at Mount Lofty|
|Wettest overall||54.2 mm at Mount Gambier Aero|
|Highest wind gust||83 km/h at Cape Willoughby on the 8th|
|Record lowest total April rainfall|
for April 2011 (mm)
|Marree Comparison||0.0||= 0.0||in 2005||126||10.9|
|Bute||0.0||= 0.0||in 1910||125||30.4|
|Oodnadatta Airport||0.0||= 0.0||in 2008||63||11.3|
|Marla Police Station||0.0||= 0.0||in 1999||25||10.9|
|Lowest total April rainfall for at least 25 years|
for April 2011 (mm)
Most recent April
at least this dry
|Lowest April mean daily minimum temperature for at least 25 years|
Mean daily minimum
for April 2011 (°C)
Most recent April
at least this cool
|Summary statistics for April 2011|
|Northwest (district 16)|
|Coober Pedy Airport||26.3||31.7||8th||12.8||7.7||11th||0.2|
|Marla Police Station||27.4||-1.3||32.5||13th||10.9||-2.8||6.5||12th||0||10.9||lowest||0%|
|Roxby Downs (Olympic Dam Aerodrome)||27.0||32.0||8th||9.8||4.5||12th||0.6|
|Far North (district 17)|
|Leigh Creek Airport||26.0||-0.2||30.2||6th||12.1||-0.8||6.1||12th||1.0||14.0||low||7%|
|Western Agricultural (district 18)|
|Coulta (Coles Point)||22.7||32.1||8th||11.4||5.3||12th||22.8|
|North Shields (Port Lincoln AWS)||21.7||33.7||8th||11.8||6.8||12th||16.4|
|Port Augusta Aero||26.3||33.3||8th||10.9||5.9||18th||5.8|
|Upper North (district 19)|
|Northeast (district 20)|
|Gluepot Reserve (Gluepot)||24.5||31.5||8th||8.1||3.5||25th||5.5|
|Lower North (district 21)|
|Clare High School||21.0||28.2||8th||9.2||3.5||23rd||13.8|
|Port Pirie Aerodrome||24.9||31.3||8th||11.4||5.6||12th||12.1|
|Port Pirie Nyrstar Comparison||25.3||+0.5||32.0||7th||13.6||+0.4||9.0||11th||11.1||27.6||average||40%|
|Snowtown (Rayville Park)||24.4||32.3||8th||9.2||4.4||3rd||7.0|
|Yorke Peninsula (district 22A)|
|Kangaroo Island (district 22B)|
|Adelaide Plains (district 23A)|
|Adelaide (Kent Town)||22.8||+0.2||31.7||8th||12.3||-0.1||7.9||12th||13.6||40.9||low||33%|
|County Light (district 23B)|
|Rosedale (Turretfield Research Centre)||22.8||-0.3||30.5||8th||9.9||-0.8||3.5||11th||11.5||36.5||low||32%|
|Mount Lofty Ranges (district 23C)|
|Hindmarsh Island AWS||21.3||31.6||8th||11.8||8.0||18th||16.6|
|Kuitpo Forest Reserve||19.1||28.3||8th||11.0||7.5||10th||29.2|
|Mount Crawford (Mt Crawford AWS)||18.3||25.7||8th||10.3||6.7||11th||12.0|
|Parawa (Second Valley Forest AWS)||17.7||26.8||8th||11.0||8.2||11th||32.2|
|Victor Harbor (Encounter Bay)||20.7||31.2||8th||9.9||4.2||18th||19.2|
|Upper Murray Valley (district 24A)|
|Loxton Research Centre||24.1||+0.2||30.3||8th||8.7||+0.3||4.1||23rd||6.4||16.2||average||40%|
|Lower Murray Valley (district 24B)|
|Murray Bridge (Pallamana Aerodrome)||22.5||31.0||8th||8.1||3.0||25th||10.4|
|Murray Bridge Comparison||23.4||-0.1||31.0||8th||9.4||-0.9||5.5||24th||17.7||28.8||average||61%|
|Murray Mallee (district 25A)|
|Upper Southeast (district 25B)|
|Lameroo (Austin Plains)||22.7||30.0||8th||7.9||3.8||3rd||9.0|
|Lower Southeast (district 26)|
|Cape Jaffa (The Limestone)||19.5||28.1||8th||10.2||4.0||18th||23.0|
|Mount Gambier Aero||19.1||-0.3||27.9||8th||9.2||+0.5||2.8||18th||54.2||55.0||average||99%|
A Monthly Climate Summary is prepared to list the main features of the weather in South Australia 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 9 am on Monday 2 May 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
(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.