South Australia in April 2017: very wet in most parts

April 2017 saw large areas of central South Australia record more than three times their April average rainfall. Temperatures were generally warmer than average across eastern parts of South Australia, but cooler than average in the northwest.

Very wet for most of the State

  • April 2017 was South Australia's tenth-wettest April on record
  • Rainfall was double the April average for South Australia as a whole
  • After largely dry conditions for many areas in the first half of the month, tropical activity from the 20th led to widespread rainfall across South Australia
  • Cold fronts brought continued rainfall through the remainder of April 2017 and large areas across the State ended the month with rainfall more than three times the April average
  • Most of central South Australia had very much above average rainfall
  • A large area around Tarcoola and Mount Eba had its wettest April on record
  • Large areas around Port Augusta, Tarcoola, Mount Eba, and Andamooka all recorded more than 400% of their April average rainfall
  • Below average rainfall in isolated patches on the Eyre Peninsula, and northern parts of the Far North
  • Sites in central South Australia and in the east had their highest April daily rainfall on record between 20-26 April
  • Several sites had their highest total April rainfall on record or highest total April rainfall for at least 20 years

Temperatures close to average

  • Temperatures for South Australia as a whole were close to average in April
  • South Australian mean maxima and mean minima were each within 0.1 degrees of average
  • Maximum and minimum temperatures were cooler than average in the far northwest pastoral district
  • Mean temperatures were warmer than average throughout most of the State's east
  • Late-season high minimum temperature records were recorded in Adelaide and Andamooka on 19 April, and at Loxton on 20 April, under an extensive area of cloud
  • Kingscote had both its warmest April night on record and its highest April mean daily minimum temperature on record

High humidity at times

  • From 19 April, a broad surface trough combined with an upper level trough to produce a large cloudband that extended from the Kimberley to South Australia, which resulted in heavy rainfall for much of the State
  • That tropical moisture also resulted in high humidity for southern and eastern districts
  • Precipitable water values on 20 April at Adelaide Airport (42.1 mm) and Woomera (41.3 mm) were both late-season records by 11 days (that is, 11 days later in the season than a value this high had been recorded before)

Further information

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Extremes in April 2017
Hottest day 36.4 °C at Oodnadatta Airport on the 8th
Warmest days on average 28.7 °C at Moomba Airport
Coolest days on average 17.8 °C at Mount Lofty
Coldest day 9.9 °C at Mount Lofty on the 26th
Coldest night 1.3 °C at Keith (Munkora) on the 3rd
Coolest nights on average 8.6 °C at Coonawarra
Warmest nights on average 15.9 °C at Neptune Island
Warmest night 24.5 °C at Port Pirie Aerodrome AWS on the 19th
Warmest on average overall 22.2 °C at Moomba Airport
Coolest on average overall 14.0 °C at Mount Lofty
Wettest overall 119.8 mm at Mount Eba
Driest overall 4.4 mm at Elliston
Wettest day 60.0 mm at Hilltown on the 20th
Strongest wind gust 98 km/h at Neptune Island on the 8th

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window


Record highest April daily rainfall
New record
(mm)
Old
record
Years of
record
Mount Eba 54.0 on the 22nd 32.0 on the 12th in 1998 100
Tarcoola (Mulgathing) 47.6 on the 24th 25.2 on the 12th in 1998 84
Tarcoola (Commonwealth Hill) 36.4 on the 22nd 29.0 on the 12th in 1998 75
Hilltown 60.0 on the 20th 56.0 on the 29th in 2007 61
Berri 29.0 on the 21st 26.8 on the 17th in 2015 57
Loxton Research Centre 39.0 on the 21st 32.6 on the 20th in 1998 33
Nangwarry Forestry SA Depot 32.0 on the 26th 27.8 on the 20th in 1998 23
Roseworthy AWS 58.6 on the 21st 26.0 on the 27th in 2007 20
Tarcoola Aero 28.8 on the 22nd 27.0 on the 9th in 2010 20



Record highest April total rainfall
New record
(mm)
Old
record
Years of
record
Average for
April
Booleroo Centre (Willowie) 118.5 114.0 in 1974 120 20.9
Mount Eba 119.8 54.0 in 2014 103 8.8
Tarcoola (Mulgathing) 68.2 45.8 in 1968 84 9.9
Tarcoola (Commonwealth Hill) 74.6 67.3 in 1968 76 10.3
Roseworthy AWS 80.8 = 80.8 in 2007 20 32.5
Tarcoola Aero 60.2 43.2 in 2014 20 13.8

Highest April total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
April
Blinman 97.7 154.2 in 1974 18.7
Coonalpyn 71.2 73.4 in 1980* 34.9
Padthaway (Marcollat) 80.2 100.0 in 1985 37.5
Coonawarra 82.2 83.6 in 1992 37.5
Wilpena (Oraparinna) 67.3 82.8 in 1990* 19.1
Yorketown 79.2 81.6 in 1992 31.1

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




Record highest April daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Clare High School 19.4 on the 19th 19.3 on the 1st in 2005 24 9.0
Kingscote Aero 19.0 on the 20th = 19.0 on the 1st in 2005 23 8.7



Record highest April mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Kingscote Aero 10.3 10.2 in 2014 22 8.7



Summary statistics for April 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
April
2017
Diff
from
average
Highest for
April
2017
Mean for
April
2017
Diff
from
average
Lowest for
April
2017
Total for
April
2017
Average
for
April
Rank of
April
2017
Fraction of
April
average
Northwest (district 16)
Andamooka 25.7 -1.6 36.0 8th 14.6 +0.5 9.6 27th 90.0 16.8 v high 536%
Coober Pedy Airport 26.0 -1.0 35.3 8th 14.0 -0.3 7.9 28th 24.4 13.4 high 182%
Ernabella (Pukatja) 25.3 -1.8 33.7 8th 11.7 -1.7 5.6 28th 40.6 17.2 high 236%
Mount Ive 25.2   31.9 18th 10.7   4.4 27th 49.8 16.1 v high 309%
Roxby Downs (Olympic Dam Aerodrome) 25.9 -1.3 35.7 8th 12.0 -0.7 5.7 12th 40.6 18.7 high 217%
Tarcoola Aero 25.8 -1.2 32.7 7th 11.2 -1.1 5.0 10th 60.2 13.8 highest 436%
Woomera Aerodrome 24.8 -0.8 34.1 8th 13.7 +0.6 7.5 27th 47.6 12.5 v high 381%
Far North (district 17)
Arkaroola 24.7 -0.5 31.7 8th 11.8 +0.7 6.2 13th 33.0 15.3 high 216%
Leigh Creek Airport 25.4 -0.9 33.3 8th 12.7 -0.3 5.4 27th 43.4 15.6 high 278%
Marree Aero 27.4 -1.4 35.2 8th 13.4 -0.8 6.8 28th 23.2 9.7 high 239%
Moomba Airport 28.7 -0.6 35.8 8th 15.7 +0.1 7.8 28th 10.8 7.5 average 144%
Oodnadatta Airport 28.2 -0.3 36.4 8th 13.7 -0.7 6.4 28th 5.6 11.1 average 50%
Western Agricultural (district 18)
Ceduna AMO 23.9 -0.3 33.9 7th 10.5 -0.2 4.1 11th 31.6 19.9 high 159%
Cleve 22.8 +0.1 30.2 18th 12.9 +0.6 8.5 27th 25.0 29.0 average 86%
Cleve Aerodrome 23.0 -0.2 32.3 18th 12.2 -0.1 8.5 4th 22.0 26.0 average 85%
Coulta (Coles Point) 23.0 +0.8 32.4 18th 12.0 +0.2 7.3 4th 9.8 21.7 low 45%
Cummins Aero 24.0   31.9 7th 10.5   4.8 1st 8.2 29.8 v low 28%
Elliston 22.7 +0.4 31.2 7th 12.5 +0.3 8.4 11th 4.4 27.4 low 16%
Kyancutta 25.9 +0.6 33.4 7th 9.8 +0.3 3.4 27th 11.2 19.7 average 57%
Minnipa Pirsa 24.6 -0.2 31.4 7th 11.9 -0.1 7.5 10th 15.6 16.3 average 96%
Neptune Island 20.0 +0.5 25.3 7th 15.9 +0.9 12.4 26th 4.8 30.5 v low 16%
North Shields (Port Lincoln AWS) 22.7 +0.5 34.0 19th 12.3 +0.1 8.4 14th 5.4 20.2 low 27%
Nullarbor 24.7 0.0 34.3 7th 11.3 -0.4 6.2 11th 42.6 22.7 high 188%
Port Augusta Aero 25.2 -1.5 35.7 8th 13.4 +0.4 6.8 27th 90.6 22.4 high 404%
Streaky Bay 24.1 +0.4 32.8 7th 12.8 0.0 8.4 3rd 9.0 23.9 low 38%
Whyalla Aero 23.6 -0.3 33.6 8th 12.7 +0.9 8.0 12th 48.4 21.9 high 221%
Wudinna Aero 25.2 0.0 32.7 7th 9.3 -0.9 2.4 4th 8.8 17.2 low 51%
Upper North (district 19)
Hawker 24.2 -1.2 32.5 8th 10.9 -0.1 4.0 27th 37.4 20.3 high 184%
Yongala 21.0 -1.0 30.0 8th     3.0 27th 60.4 25.5 v high 237%
Northeast (district 20)
Gluepot Reserve (Gluepot) 24.7 -0.1 33.6 8th 9.5 +1.0 2.8 3rd 24.2 22.0 average 110%
Yunta Airstrip 23.4 -1.0 32.1 8th 9.8 +0.7 3.3 27th 19.2 12.4 high 155%
Lower North (district 21)
Clare High School 21.7 +0.1 29.8 19th 10.1 +1.1 5.1 27th 57.8 40.2 high 144%
Port Pirie Aerodrome AWS 25.1   33.4 8th 11.9   5.9 27th 63.8
Snowtown (Rayville Park) 24.5 -0.2 32.6 19th 9.9 +0.5 4.6 27th 52.8 27.1 high 195%
Yorke Peninsula (district 22A)
Edithburgh 21.8 +0.7 31.0 7th 14.2 +1.2 10.1 13th 41.2 25.4 high 162%
Kadina AWS 23.9 0.0 32.1 18th 10.5 +0.2 4.1 27th 24.2 30.9 low 78%
Minlaton Aero 23.5 +0.3 31.7 19th 12.3 +0.5 6.4 27th 29.8 25.3 high 118%
Stenhouse Bay 21.3 +0.4 31.7 19th 14.9 +0.9 11.4 12th 17.0 27.3 average 62%
Warooka 22.6 +0.6 29.8 19th     11.0 3rd 63.6 33.0 high 193%
Kangaroo Island (district 22B)
Cape Borda 19.9 +0.2 26.2 19th 12.7 +0.3 8.8 27th 36.4 42.6 average 85%
Kingscote Aero 22.0 +0.4 29.1 7th 10.3 +1.6 5.9 13th 21.4 27.2 average 79%
Parndana Cfs AWS 21.3   29.4 19th 11.3   8.2 27th 31.2
Adelaide Plains (district 23A)
Adelaide (Kent Town) 23.3 +0.6 30.8 19th 13.3 +0.9 9.4 15th 33.2 39.4 average 84%
Adelaide Airport 22.8 +0.6 31.1 19th 13.1 +1.3 8.2 11th 25.2 34.7 average 73%
Edinburgh RAAF 23.8 +0.8 32.7 19th 12.1 +0.4 6.5 4th 15.2 30.6 low 50%
Parafield Airport 24.1 +1.4 31.7 19th 12.0 +0.2 6.6 15th 22.2 38.6 average 58%
Roseworthy AWS 24.3 +0.3 33.0 8th 10.5 +0.1 3.9 3rd 80.8 32.5 highest 249%
County Light (district 23B)
Nuriootpa Pirsa 21.8 0.0 30.1 8th 9.8 +0.7 4.5 2nd 42.2 35.3 average 120%
Rosedale (Turretfield Research Centre) 23.5 +0.4 31.2 19th 10.9 +0.2 4.5 4th 56.8 36.8 high 154%
Mount Lofty Ranges (district 23C)
Hindmarsh Island AWS 21.8 +0.2 30.4 7th 12.9 +0.6 8.2 12th 39.4 28.2 average 140%
Kuitpo Forest Reserve 20.2 +0.6 29.1 19th 11.7 +0.5 6.5 26th 68.4 58.6 average 117%
Mount Barker 21.6 +1.1 28.9 7th 10.3 +1.9 5.7 3rd 58.6 58.1 average 101%
Mount Crawford AWS 19.8 +0.7 27.3 19th 11.0 +0.6 5.1 3rd 68.0 44.7 high 152%
Mount Lofty 17.8 +2.2 25.2 19th 10.2 +0.5 4.2 26th 60.6
Noarlunga 22.5 +0.2 31.2 19th 14.1 +0.5 8.6 3rd 50.0 33.4 high 150%
Parawa (Second Valley Forest AWS) 19.2 +1.2 27.9 19th 12.1 +1.0 7.2 26th 74.2 59.6 average 124%
Victor Harbor (Encounter Bay) 21.3 -0.1 29.9 7th 11.4 +1.1 6.5 15th 60.4 35.1 high 172%
Upper Murray Valley (district 24A)
Loxton Research Centre 23.9 0.0 32.9 8th 10.3 +1.7 5.0 13th 48.4 18.4 v high 263%
Renmark Aero 24.4 0.0 34.0 8th 10.7 +1.7 5.2 13th 32.8 18.6 average 176%
Lower Murray Valley (district 24B)
Eudunda 21.6 +0.2 30.1 8th 10.5 +0.7 6.0 3rd 35.2 33.4 average 105%
Meningie 22.7 +1.0 31.4 7th 11.7 +0.9 6.2 15th 55.0 37.6 high 146%
Murray Bridge (Pallamana Aerodrome) 23.7 +0.6 32.7 8th 9.9 +0.7 4.3 15th 24.8 29.1 average 85%
Strathalbyn Racecourse 22.6 +0.4 30.8 8th 11.5 +1.1 5.7 3rd 45.2 29.2 high 155%
Murray Mallee (district 25A)
Karoonda 23.4 -0.1 33.1 8th 10.2 +0.7 5.5 4th 40.0 24.7 high 162%
Upper Southeast (district 25B)
Keith 22.7 +0.2 32.0 8th 10.4 +1.1 4.0 3rd 59.2 32.9 high 180%
Keith (Munkora) 22.9 -0.3 32.7 8th 8.7 +0.6 1.3 3rd 55.0 25.5 v high 216%
Lameroo (Austin Plains) 23.4 +0.2 32.8 8th 9.7 +0.6 4.7 3rd 51.6 27.9 v high 185%
Lower Southeast (district 26)
Cape Jaffa (The Limestone) 20.1 +0.2 27.7 18th 11.3 +0.6 7.0 14th 43.0 34.3 high 125%
Coonawarra 20.5 -0.5 28.6 7th 8.6 +0.9 2.2 3rd 82.2 37.5 v high 219%
Mount Gambier Aero 20.0 +0.5 28.6 7th 9.7 +1.0 5.1 4th 62.8 54.7 average 115%
Naracoorte Aerodrome 21.0 -1.0 28.6 7th 9.0 +1.0 2.7 3rd 71.6 28.3 v high 253%
Padthaway South 21.3 -0.7 29.1 7th 9.0 +0.9 2.5 3rd 85.0 28.6 v high 297%
Robe Airfield 20.5 0.0 28.4 7th 9.9 +0.5 3.9 13th 66.4 42.4 v high 157%

Notes

The Monthly climate summary, generally published on the first working day of each month, lists 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. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This statement has been prepared based on information available at 10 am on Monday 1 May 2017. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites 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 10 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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries