Greater Adelaide in 2020: near average rainfall and temperatures

Rainfall in 2020 was close to average or above average at sites across Adelaide and the Hills. Both daytime and night-time temperatures for 2020 were within 1 °C of average at most sites across Adelaide and the Hills.

Near average rainfall

  • Rainfall in 2020 was close to average or above average at all sites across Adelaide and the Hills.
  • Overall, 2020 was Greater Adelaide's wettest year since 2017.
  • It was a wet start to the year, with above average rainfall for the January to April period.

  • Rainfall was very much below average in July, before average to above average rainfall returned to the city in September and October.
  • The year ended with two drier than average months, with some sites recording less than half their November average rainfall.
  • Rainfall totals for 2020 ranged from 88% of average at Parafield Airport and Adelaide Airport to 120% of average at Kuitpo Forest Reserve.

Coolest year since 2003

  • After more than a decade of warmer than average years, 2020 was Greater Adelaide's overall coolest year since 2003.
  • Daytime temperatures for 2020 were within 1 °C of the long-term average at most sites across Adelaide and the Hills.
  • Temperatures varied markedly during the year, with several significant heatwaves being offset by some very much cooler than average days, particularly during winter.
  • On 7 August, South Australia as a whole had its coldest August day on record and Kuitpo Forest Reserve had its coldest day on record.
  • Edinburgh RAAF equalled its lowest mean daily maximum temperature since 1998.
  • Mean maximum temperatures ranged from 0.7 °C cooler than average at Kuitpo Forest Reserve to 1.1 °C warmer than average at Mount Lofty.
  • Night-time temperatures for the year were within 1 °C of average at all sites across Adelaide and the Hills.
  • Mean minimum temperatures ranged from 0.6 °C cooler than average at Parafield Airport to 0.3 °C warmer than average at Adelaide Airport.
  • Much of eastern South Australia, including Adelaide, experienced many cold nights during winter.
  • During winter, Parafield Airport and Noarlunga had their lowest temperature on record.
  • Parafield Airport had its lowest mean daily minimum temperature since 1998.
  • Edinburgh RAAF had its overall lowest mean temperature since 1998.

Adelaide (West Terrace / ngayirdapira)

  • Total rainfall for Adelaide (West Terrace / ngayirdapira) was 471.2 mm, which is 89% of the long-term average of 526.7 mm.
  • The mean daily maximum temperature for Adelaide (West Terrace / ngayirdapira) was 22.0 °C, which is 0.2 °C above the long-term average of 21.8 °C.
  • The warmest day was 43.3 °C on 30 January, and the coolest day was on 7 August when the temperature reached 10.3 °C.
  • The mean daily minimum temperature for Adelaide (West Terrace / ngayirdapira) was 12.1 °C, which is 0.1 °C above the long-term average of 12.0 °C.
  • The coldest morning was 0.8 °C on 5 August, and the warmest morning was on 31 January when the minimum temperature was 29.0 °C.

Further information

Media
(03) 9669 4057

Extremes in 2020
Hottest day 43.9 °C at Adelaide (Kent Town) on 30 Jan
Warmest days on average 23.1 °C at Parafield Airport
Coolest days on average 16.7 °C at Mount Lofty
Coldest day 5.2 °C at Mount Lofty on 7 Aug
Coldest night -2.8 °C at Parafield Airport on 28 Jul
Coolest nights on average 8.5 °C at Mount Lofty
Warmest nights on average 12.3 °C at Noarlunga
Warmest night 29.9 °C at Adelaide (Kent Town) on 31 Jan
Warmest on average overall 17.1 °C at Adelaide (West Terrace / ngayirdapira)
Coolest on average overall 12.6 °C at Mount Lofty
Wettest overall 1128.0 mm at Piccadilly (Woodhouse)
Wettest day 64.4 mm at Piccadilly (Mount Lofty Botanic Garden) on 1 Feb
Strongest wind gust 124 km/h at Sellicks Hill (Mount Terrible Radar) on 22 Nov

Record lowest daily maximum temperature
New record
(°C)
Old
record
Years of
record
Annual
average
Kuitpo Forest Reserve 6.7 on 7 Aug 7.0 on 12 Jul 2016 23 19.3



Lowest annual mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Annual
average
Edinburgh RAAF 22.5 =22.5 in 1998 22.7



Record lowest temperature
New record
(°C)
Old
record
Years of
record
Annual
average
Parafield Airport -2.8 on 28 Jul -2.3 on 15 Jun 2006 66 11.2
Noarlunga 1.8 on 5 Aug 2.0 on 24 Jun 2019 21 12.8



Lowest annual mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Annual
average
Parafield Airport 10.6 10.4 in 1998 11.2



Lowest annual mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Annual
average
Edinburgh RAAF 16.9 16.3 in 1998 16.9



Summary statistics for 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean
for
2020
Diff
from
average
Highest
for
2020
Mean
for
2020
Diff
from
average
Lowest
for
2020
Total
for
2020
Average
annual
total
Rank
of
2020
Fraction
of annual
average
Adelaide (West Terrace / ngayirdapira) 22.0 +0.2 43.3 30 Jan 12.1 +0.1 0.8 5 Aug 471.2 526.7 average 89%
Adelaide Airport 21.5 -0.1 42.3 30 Jan 11.8 +0.3 -0.4 10 Jun 392.4 437.3 average 90%
Edinburgh RAAF 22.5 -0.2 43.4 30 Jan 11.2 0.0 -0.9 5 Aug 392.2 426.9 low 92%
Kuitpo Forest Reserve 18.6 -0.7 39.7 30 Jan 9.9 -0.5 1.6 5 Aug 854.8 710.7 v high 120%
Mount Crawford AWS 18.7 -0.4 41.1 30 Jan 9.4 -0.4 1.2 5 Aug 732.8 651.9 average 112%
Mount Lofty 16.7 +1.1 37.3 30 Jan 8.5 -0.2 -0.1 5 Aug 1003.0 990.5 average 101%
Noarlunga 21.2 -0.6 42.4 30 Jan 12.3 -0.5 1.8 5 Aug 509.4 445.8 high 114%
Parafield Airport 23.1 +0.6 43.7 30 Jan 10.6 -0.6 -2.8 28 Jul 396.2 448.0 low 88%

Notes

The Annual climate summary 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 8 am on Monday 4 January 2021. 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

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