South Australia in April 2010

Warmer than normal throughout, with above average rainfall across the pastorals.

This statement was prepared before all data for the period were available. This may affect some of the statistics presented.
  • Above to well above average rainfall over the pastoral districts, and over parts of the southeast, with record April rainfall in the southeast of the Northwest Pastoral District.
  • Warmer than average across the state, with a warmer than average year so far.
  • Record warm April minimums over South Australian agricultural areas.

Rainfall

Rainfall values have been above average across most of the north and east of the state, with some rainfall records set in the Northwest Pastoral District. Along the coasts, rainfall totals were generally close to average.

So far this year, rainfall totals have been above average across most of the state, apart from a band of close to average falls stretching from the northwest corner down toward Adelaide. Year to date rainfall totals exceed 50mm across most of the state, with large areas in the north and east greater than 100mm. In the northeast totals exceed 200mm, due to heavy rainfall in February and March associated with the low pressure system approaching from the Northern Territory.

Pastoral Districts

Intense areas of rain and thunderstorms ahead of the upper trough caused localised flooding in the southeast Northwest Pastoral District on the 9th, with record rainfalls set at several locations. Roxby Downs Station had 124.0 mm to 9am on the 9th, Roxby Downs (Olympic Dam Aerodrome) had 86.0 mm, Andamooka 85mm,Yardea 80.0 mm, Leigh Creek Airport 67.4mm, Beltana Roadhouse 54.2mm, Parachilna (Motpena) 30.0 mm and Tarcoola Aero 27.0 mm. Note that those stations with less than 25 years of record are not listed in the record table.

Most rainfall totals recorded in the pastoral districts were above average, and generally ranged from 30 to 100mm. The highest monthly total of 156.0mm was recorded at Andamooka. The lowest of 18.0 mm was recorded at Coober Pedy Airport.

Agricultural Districts

Rainfall over the agricultural districts was generally close to average, tending above average in the east. Rainfall totals ranged from about 30 to 60mm in the Southeast, Lower Murray Valley and East Central districts, from 20 to 40mm over the West Central and Upper and Lower North districts, 15 to 30mm over the Western Agricultural, Murray Mallee and Upper Murray Valley. The highest total of 82.6mm was recorded at Mount Lofty. The lowest of 5.4 mm was recorded at Port Augusta.

Some sites had their highest total 1 April to 30 April rainfall on record.

Some sites had their highest total 1 April to 30 April rainfall for at least 25 years.

Some sites had their highest 1 April to 30 April daily rainfall on record.

Temperature

Maximum

Mean maximum temperatures were warmer than average across South Australia this April, with temperatures generally 1 to 2C warmer than the long term mean.

Over the pastoral districts, mean maximum temperatures ranged from 24.9C at Yunta Airstrip to 29.4C at Oodnadatta Airport in the Far North District. The highest recorded maximum temperature in the pastoral districts for April was 35.9C at Moomba Airport on the 7th of the month, with the lowest being 16.8C at Ernabella (Pukatja) on the 11th.

Over the agricultural districts mean maximum temperatures ranged from 18.3C at Mount Lofty to 28.1C at Port Augusta Aero. The highest recorded daily maximum temperature for April in the agricultural areas was 35.4C at Ceduna AMO on the 4th of the month, with the lowest 12.2C at Mount Lofty on the 28th.

Mean maximum temperatures have been well above average across the state this year so far, apart from the northeast corner which grades from average to below average in the far northeast. Mean maximum temperature were between 1.5 and 2C warmer than the long-term average across parts of the south for the January to April period this year, and between 1 and 1.5C warmer across the rest of the south and west.

Some sites have recorded their warmest mean maximum temperatures for the January to April period. Adelaide (Kent Town) recorded a mean maximum temperature of 28.7C, which just exceeds the previous record of 28.6C set in 2007 at Kent Town. Rosedale recorded a mean maximum temperature of 29.6C, exceeding the previous record of 29.1C set in 2007. Mount Barker recorded a mean maximum of 27.8C, exceeding its previous record January to April man maximum record of 27.6C set in 2009.

Minimum

Mean monthly overnight minimum temperatures were much warmer than average throughout in April, with anomalies of between 1 to 3C across the state.

In the pastoral districts these ranged from 10.7C at Gluepot Reserve to 16.9C at Moomba Airport in the Far North District. The lowest recorded daily minimum temperature for April in the pastoral districts was 2.8C at the Yunta Airstrip on the 16th of the month, the warmest being 23.4C at Marla Police Station on the 7th.

Across the agricultural areas the mean minimum temperatures this month ranged from 9.3C at Yongala to 15.9C at Neptune Island in the Western Agricultural. The lowest recorded daily minimum temperature for April was 2.0C at Yongala on the 28th, whilst the warmest minimum was 22.0C at Port Pirie Nyrstar Comparison on the 5th.

Mean minimum temperatures have also been much warmer than normal across South Australia this year so far, with temperatures generally between 1 and 2C warmer throughout. The Agricultural districts have had their record warmest minimum temperatures for the January to April period in the area averaged record going back to 1950, exceeding 1961 as the previous warmest period.

Some sites have recorded their warmest mean minimum temperatures for the January to April period. Adelaide (Kent Town) recorded a mean minimum temperature of 16.9C, which equals the previous record of 16.9C set in 2007 at Kent Town, but not the previous record set at the West Terrace site, which had a mean minimum temperature of 18.0C for January to April 1968. Loxton Research Centre has also set a new record mean minimum temperature for this period, with 14.0C just exceeding the previous record of 13.9C set in 2007.

One site had their warmest 1 April to 30 April night (highest daily minimum temperature) on record.

Some sites had their highest 1 April to 30 April mean daily minimum temperature on record.

Some sites had their highest 1 April to 30 April mean daily minimum temperature for at least 25 years.

Further information

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Extremes in 1 April to 30 April 2010
Hottest day 35.9 °C at Moomba Airport on the 7th
Warmest days on average 29.4 °C at Oodnadatta Airport
Coolest days on average 18.3 °C at Mount Lofty
Coldest day 12.2 °C at Mount Lofty on the 28th
Coldest night 2.0 °C at Yongala on the 28th
Coolest nights on average 9.3 °C at Yongala
Warmest nights on average 16.9 °C at Moomba Airport
Warmest night 23.4 °C at Marla Police Station on the 7th
Wettest overall 156.0 mm at Andamooka
Highest wind gust 85 km/h at Cape Jaffa (The Limestone) on the 6th

Record highest 1 April to 30 April daily rainfall
Highest daily rainfall
in 1 April to 30 April 2010 (mm)
Previous highest
for 1 April to 30 April
Years of
record
Andamooka 85.0 on the 9th 62.0 on the 17th in 1971 43
Parachilna (Motpena) 30.0 on the 9th 29.4 on the 14th in 2000 42
Beltana Roadhouse 54.2 on the 9th 19.6 on the 13th in 2003 25



Record highest total 1 April to 30 April rainfall
Total rainfall
for 1 April to 30 April 2010 (mm)
Previous highest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Andamooka 156.0 87.6 in 1974 43 16.4

Highest total 1 April to 30 April rainfall for at least 25 years
Total rainfall
for 1 April to 30 April 2010 (mm)
Most recent higher
for 1 April to 30 April
Years since
higher
Average for
1 April to 30 April
Woomera Aerodrome 55.0 68.8 in 1963 47 11.7
Blinman 73.3 154.2 in 1974 36 16.3
Parachilna (Motpena) 70.6 85.4 in 1974 36 12.8



Record highest 1 April to 30 April daily minimum temperature
Highest daily minimum
temperature
in 1 April to 30 April 2010 (°C)
Previous highest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Murray Bridge Comparison 21.6 on the 23rd 19.0 on the 12th in 1991 44 10.2



Record highest 1 April to 30 April mean daily minimum temperature
Mean daily minimum
temperature
for 1 April to 30 April 2010 (°C)
Previous highest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Streaky Bay 14.7 14.5 in 2007 49 12.9
Edinburgh RAAF 13.8 = 13.8 in 2005 36 11.9
Loxton Research Centre 11.5 9.8 in 1989 26 8.4

Highest 1 April to 30 April mean daily minimum temperature for at least 25 years
Mean daily minimum
temperature
for 1 April to 30 April 2010 (°C)
Most recent higher
for 1 April to 30 April
Years since
higher
Average for
1 April to 30 April
Ceduna AMO 13.2 13.4 in 1968 42 10.7
Mount Gambier Aero 11.2 11.6 in 1968 42 8.7
Lameroo Comparison 11.8 12.0 in 1971 39 9.2
Port Pirie Nyrstar Comparison 15.7 15.9 in 1971 39 13.6
Murray Bridge Comparison 11.9 13.0 in 1974 36 10.2
Keith 11.7 11.8 in 1980 30 9.4
Meningie 12.2 12.3 in 1980 30 10.7



Summary statistics for 1 April to 30 April 2010
Maximum temperatures
for 1 April to 30 April
(°C)
Minimum temperatures
for 1 April to 30 April
(°C)
Rainfall
for 1 April to 30 April
(millimetres)
Mean for
1 April to 30 April
2010
Diff
from
average
Highest for
1 April to 30 April
2010
Mean for
1 April to 30 April
2010
Diff
from
average
Lowest for
1 April to 30 April
2010
Total for
1 April to 30 April
2010
Average
for
1 April to 30 April
Rank of
1 April to 30 April
2010
Fraction of
1 April to 30 April
average
Northwest (district 16)
Andamooka 27.3 0.0 32.2 2nd 15.4 +1.4 10.3 26th 156.0 16.4 highest 951%
Coober Pedy Airport 28.0   32.5 7th 15.4   9.6 26th 18.0
Ernabella (Pukatja) 27.9   35.1 6th 14.4   6.6 30th 37.2
Marla Police Station     34.4 6th 16.6 +3.2 10.2 17th 29.2 10.6 v high 275%
Nonning 26.8 +1.9 32.5 1st 12.7 +2.0 4.5 26th 5.6 15.0 average 37%
Roxby Downs (Olympic Dam Aerodrome) 27.1   32.4 1st 15.7   10.2 29th 139.0
Tarcoola Aero 27.7   33.9 2nd 13.6   7.2 28th 41.0
Woomera Aerodrome 26.4 +0.9 32.2 1st 14.8 +1.8 9.8 26th 55.0 11.7 v high 470%
Far North (district 17)
Arkaroola 26.5 +1.3 34.0 7th 11.9 +0.8 5.6 10th 40.9 14.0 v high 292%
Leigh Creek Airport 26.6 +0.4 32.3 1st 14.6 +1.7 8.8 15th 112.4
Marree Aero 29.0   34.0 7th 15.1   9.3 14th 10.0
Moomba Airport 29.3   35.9 7th 16.9   11.2 14th 26.6
Oodnadatta Airport 29.4 +0.9 34.0 4th 16.5 +2.1 9.9 29th 40.0 12.1 v high 331%
Western Agricultural (district 18)
Ceduna AMO 25.0 +0.8 35.4 4th 13.2 +2.5 6.1 12th 16.8 19.5 average 86%
Cleve 23.7 +0.8 31.0 22nd 14.0 +1.4 8.0 28th 19.0 28.3 average 67%
Cleve Aerodrome 23.6   31.3 22nd 13.9   7.9 28th 17.6 25.6 average 69%
Coulta (Coles Point) 22.3   31.1 4th 13.5   7.5 12th 38.4
Cummins Aero 23.9   32.1 4th 12.5   4.9 12th 26.2
Elliston 22.8 +0.4 30.5 4th 13.6 +1.4 7.1 26th 32.9 27.2 average 121%
Kimba 24.4 +0.4 31.0 5th 12.4 +1.2 6.5 28th 9.2 22.6 average 41%
Kyancutta 26.3 +1.0 33.8 4th 11.7 +2.2 4.4 28th 15.0 19.8 average 76%
Neptune Island 19.9 +0.4 23.0 22nd 15.9 +0.9 13.3 13th 41.0 33.2 high 123%
North Shields (Port Lincoln AWS) 22.6   30.2 22nd 13.0   8.5 28th 35.8
Nullarbor 25.0 +0.1 35.1 22nd 12.6 +0.9 7.5 29th 21.0 25.9 average 81%
Port Augusta Aero 28.1   33.5 5th 13.4   5.6 26th 5.4
Streaky Bay 24.7 +0.5 32.7 3rd 14.7 +1.8 9.5 12th 13.2 23.1 average 57%
Whyalla Aero 25.7 +1.6 33.3 5th 13.1   6.8 13th 12.4 19.2 average 65%
Wudinna Aero 26.4   33.1 22nd 12.2   4.9 13th 12.0
Upper North (district 19)
Hawker 25.7 +0.2 31.0 1st 12.7 +1.8 6.5 29th 40.2 19.5 high 206%
Yongala 24.2 +1.8 29.6 5th 9.3 +2.1 2.0 28th 27.0 24.3 average 111%
Northeast (district 20)
Gluepot Reserve (Gluepot) 25.8   32.1 22nd 10.7   2.9 12th 19.1
Yunta Airstrip 24.9   30.1 5th 10.9   2.8 16th 9.6
Lower North (district 21)
Clare High School 23.0   29.9 5th 10.9   3.4 28th 40.4
Port Pirie Aerodrome 26.6   33.0 5th 13.3   7.0 12th 22.7
Port Pirie Nyrstar Comparison 26.6 +1.7 32.5 5th 15.7 +2.1 10.0 13th 33.6 27.8 high 121%
Snowtown (Rayville Park) 25.8   32.7 5th 11.0   4.8 13th 31.0
Yorke Peninsula (district 22A)
Edithburgh 22.3   30.1 22nd 14.2   6.2 28th 22.8
Kadina AWS 25.6   32.7 5th 12.3   6.3 16th 28.6
Maitland 23.6 +1.3 31.4 5th 14.3 +1.9 7.9 12th 39.8 43.4 average 92%
Minlaton Aero 23.6   31.5 5th 13.6   7.0 12th 25.6
Stenhouse Bay 21.7   28.8 22nd 14.7   9.6 26th 40.2
Warooka 23.1 +0.9 30.0 5th 13.8 +1.0 9.4 13th 18.4 32.5 average 57%
Kangaroo Island (district 22B)
Cape Borda 20.1   25.2 5th 13.4   8.4 13th 36.6
Cape Willoughby 19.8 +0.8 25.1 18th 15.1 +1.1 11.3 28th 40.0 39.4 average 102%
Kingscote Aero 22.8   28.7 5th 9.8   4.4 15th 27.8
Adelaide Plains (district 23A)
Adelaide (Kent Town) 24.2 +1.6 32.2 5th 14.3 +1.9 7.4 12th 49.6 40.6 average 122%
Adelaide Airport 23.3 +1.1 31.6 5th 13.7 +2.0 7.4 12th 61.4 35.6 high 172%
Edinburgh RAAF 24.4 +1.3 31.9 5th 13.8 +1.9 6.5 12th 33.4 31.4 average 106%
Parafield Airport 24.8 +2.1 32.8 5th 13.2 +1.2 5.6 12th 30.4 39.5 average 77%
Roseworthy AWS 25.1   32.4 5th 12.9   5.2 12th 30.0
County Light (district 23B)
Nuriootpa Viticultural 22.6   29.7 5th 11.2   3.7 12th 55.4
Rosedale (Turretfield Research Centre) 24.4 +1.4 31.7 5th 12.3 +1.7 4.0 12th 47.1 36.0 average 131%
Mount Lofty Ranges (district 23C)
Hindmarsh Island AWS 22.5   31.4 5th 13.4   8.3 26th 34.8
Kuitpo Forest Reserve 20.4   29.8 5th 11.9   7.9 14th 75.0
Mount Barker 22.8 +2.0 31.4 5th 9.9 +1.4 3.0 12th 55.4 60.4 average 92%
Mount Crawford (Mt Crawford AWS) 20.6   28.6 5th 11.7   6.8 13th 64.4
Mount Lofty 18.3   26.7 5th 10.7   5.9 13th 82.6
Noarlunga 22.9   31.0 5th 14.5   8.8 12th 55.6
Parawa (Second Valley Forest AWS) 19.0   28.1 5th 12.1   8.3 14th 37.6
Victor Harbor (Encounter Bay) 22.1   29.8 22nd 11.0   4.4 15th 15.6
Upper Murray Valley (district 24A)
Loxton Research Centre 24.8 +1.0 31.5 22nd 11.5 +3.1 3.9 12th 17.4 16.6 average 105%
Renmark Aero 25.0   32.3 22nd 12.0   3.9 12th 21.8
Lower Murray Valley (district 24B)
Eudunda 22.9 +1.5 28.8 19th 11.4 +1.6 5.2 12th 28.2 33.4 average 84%
Meningie 22.6 +0.9 30.2 5th 12.2 +1.5 6.4 14th 68.8 38.8 high 177%
Murray Bridge (Pallamana Aerodrome) 24.0   31.6 5th 10.8   3.7 26th 29.2
Murray Bridge Comparison 24.8 +1.3 31.6 5th 11.9 +1.7 5.9 12th 39.2 29.0 high 135%
Strathalbyn Racecourse 22.8   31.5 5th 11.6   6.6 26th 49.2
Murray Mallee (district 25A)
Karoonda 24.0   31.0 22nd 11.2   5.1 12th 24.8 24.9 average 100%
Upper Southeast (district 25B)
Keith 22.6 0.0 29.8 22nd 11.7 +2.3 4.6 13th 55.2 33.3 high 166%
Keith (Munkora) 22.6   29.8 22nd 10.5   3.1 13th 53.0
Lameroo (Austin Plains) 23.3   30.4 22nd 11.1   4.9 28th 39.8
Lameroo Comparison 23.7 +0.4 30.4 22nd 11.8 +2.6 6.0 28th 28.2 27.3 average 103%
Lower Southeast (district 26)
Cape Jaffa (The Limestone) 20.0   27.5 5th 12.5   6.5 14th 50.8
Coonawarra 21.1 +0.1 28.2 22nd 10.3   3.0 26th 59.2 35.5 high 167%
Mount Gambier Aero 20.1 +0.7 27.6 5th 11.2 +2.5 6.5 26th 65.8 54.9 average 120%
Naracoorte Aerodrome 21.3   28.2 22nd 10.7   3.4 3rd 66.4
Padthaway South 21.3   28.2 22nd 10.5   3.2 14th 62.4
Robe Airfield 20.6   27.3 5th 11.2   5.0 26th 56.2
Robe Comparison 19.5 +0.8 25.4 5th 13.2 +1.7 8.5 26th 43.8 45.9 average 95%

Notes

This statement was prepared before all data for the period were available. This may affect some of the statistics presented.

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 3 pm on Friday 30 April 2010. 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