Greater Adelaide in autumn 2020: Cooler days, average rainfall

Rainfall in autumn was average across Adelaide and the Hills, despite a wetter than average April. Daytime and night-time temperatures were generally cooler than average throughout Greater Adelaide for the season as a whole, with the season ending with particularly cool nights throughout of May.

Average rainfall owing mostly to a wet April

  • Autumn rainfall average to above average across Greater Adelaide
  • Moderate to heavy rain events in April and May brought above average totals, but March was much drier than average
  • The wettest days for the season were during April, with 49.4 mm recorded at Mount Lofty (Cleland Conservation Park) on April 6th
  • The wettest site was at Piccadilly (Woodhouse) in the Adelaide Hills, recording 313.1 mm for the season
  • Rainfall totals ranged from 106% of average at Adelaide (West Terrace / ngayirdapira) and at Mount Lofty to 140% of average at Noarlunga

Cooler than average days

  • Autumn daytime temperatures were cooler than average throughout Adelaide and the Hills
  • Mean maximum temperatures ranged from 1.6 °C below average at Kuitpo Forest Reserve to 0.0 °C at Mount Lofty
  • Night-time temperatures were close to average for the season as whole, but ended with cool nights during May
  • Mean minimum temperatures ranged from 0.9 °C below average at Parafield Airport, Mount Lofty and Kuitpo to 0.3 °C above average at Adelaide Airport and at Mount Barker

Adelaide (West Terrace / ngayirdapira)

  • Total rainfall for Adelaide (West Terrace / ngayirdapira) was 144.2 mm, which is 106% of the long-term average of 135.9 mm
  • The mean daily maximum temperature for Adelaide (West Terrace / ngayirdapira) was 21.5 °C, which is 0.8 °C below the long-term average of 22.3 °C
  • The warmest day was 34.1 °C on 18 March, and the coolest day was on 24 May when the temperature reached 14.0 °C
  • The mean daily minimum temperature for Adelaide (West Terrace / ngayirdapira) was 12.5 °C, which is 0.3 °C below the long-term average of 12.8 °C
  • The coldest morning was 4.3 °C on 16 May, and the warmest morning was on 19 March when the minimum temperature was 25.6 °C

Further information

Media
(03) 9669 4057

Extremes in autumn 2020
Hottest day 35.0 °C at Adelaide (Kent Town) on 18 Mar
Warmest days on average 22.4 °C at Parafield Airport
Coolest days on average 16.0 °C at Mount Lofty
Coldest day 8.2 °C at Mount Lofty on 24 May
Coldest night 1.0 °C at Mount Barker on 15 May
Coolest nights on average 8.8 °C at Mount Lofty
Warmest nights on average 12.9 °C at Noarlunga
Warmest night 26.5 °C at Noarlunga on 19 Mar
Warmest on average overall 17.0 °C at Adelaide (Kent Town) and at Adelaide (West Terrace / ngayirdapira)
Coolest on average overall 12.4 °C at Mount Lofty
Wettest overall 313.1 mm at Piccadilly (Woodhouse)
Wettest day 49.4 mm at Mount Lofty (Cleland Conservation Park) on 6 Apr
Strongest wind gust 89 km/h at Mount Crawford AWS on 7 May

Summary statistics for autumn 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
autumn
2020
Diff
from
average
Highest for
autumn
2020
Mean for
autumn
2020
Diff
from
average
Lowest for
autumn
2020
Total for
autumn
2020
Average
for
autumn
Rank of
autumn
2020
Fraction of
autumn
average
Adelaide (Kent Town) 21.8 -1.0 35.0 18 Mar 12.2 -0.5 3.5 16 May 152.2 126.8 high 120%
Adelaide (West Terrace / ngayirdapira) 21.5 -0.8 34.1 18 Mar 12.5 -0.3 4.3 16 May 144.2 135.9 average 106%
Adelaide Airport 21.1 -1.0 34.4 18 Mar 12.3 +0.3 3.2 16 May 125.4 109.4 average 115%
Edinburgh RAAF 21.9 -1.2 34.9 18 Mar 11.8 -0.1 3.0 16 May 137.8 100.1 high 138%
Kuitpo Forest Reserve 18.3 -1.5 32.5 18 Mar 10.3 -0.9 5.5 25 May 217.2 177.3 high 123%
Mount Barker 20.0 -0.6 32.4 11 Mar 8.9 +0.3 1.0 15 May 193.4 176.4 average 110%
Mount Crawford AWS 18.1 -1.2 31.3 11 Mar 9.7 -0.8 4.2 25 May 175.8 141.8 high 124%
Mount Lofty 16.0 0.0 28.7 18 Mar 8.8 -0.9 2.8 25 May 246.6 233.4 average 106%
Noarlunga 20.8 -1.4 34.3 18 Mar 12.9 -0.8 6.8 26 May 151.2 107.8 v high 140%
Parafield Airport 22.4 -0.5 35.0 18 Mar 11.0 -0.9 1.4 16 May 134.0 108.6 high 123%

Notes

The Seasonal climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Adelaide 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 summary includes data from observing sites in or near the Greater Adelaide “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 10 am on Monday 1 June 2020. 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