Greater Brisbane in autumn 2021: above to well above average rainfall; days cooler than usual

Autumn rainfall was well above average across Greater Brisbane, with much of the autumn rainfall total falling in March. Mean maximum temperatures were generally cooler than usual at most sites. Mean minimum temperatures were within half a degree of average at all sites.

Well above average rainfall in autumn

  • Autumn rainfall was well above average and some sites had their highest total autumn rainfall for at least 20 years
  • Rainfall in March was very much above average, and record high at a few sites. Persistent showers, thunderstorms and periods of rain saw most locations generally recording more than 200 mm for the month. Some sites had their highest autumn daily rainfall on record. The extreme falls occurred in connnection with the major rainfall event in March, and Special Climate Statement 74 was issued.
  • Rainfall totals were near to above average across Greater Brisbane in April.
  • In May, rainfall was average to above average across Greater Brisbane, with most of the monthly total falling in the first half of the month.

Maximum temperature were generally cooler than usual

  • Mean maximum temperatures for autumn were generally cooler than usual at most sites in Greater Brisbane.
  • In March, mean maximum temperatures were cooler than average at most sites.
  • Mean maximum temperatures were cooler than usual across Greater Brisbane in April, and in May, mean maximum temperatures were close to average.
  • Mean minimum temperatures for autumn were within half a degree of the long-term average, with some sites slightly warmer than usual and some sites slightly cooler than usual.
  • Mean minimum temperatures were warmer than average at most sites in March.
  • April mean minimum temperatures were cooler than usual, with some sites, including Amberley and Beaudesert, more than one degree cooler than average.
  • Mean minimum temperatures were within a degree of the long-term average in May.

Brisbane

  • Total rainfall for Brisbane was 502.6 mm, which is 196% of the long-term average of 256.2 mm.
  • The mean daily maximum temperature for Brisbane was 26.2 °C, which is 0.8 °C below the long-term average of 27.0 °C.
  • The warmest day was 33.2 °C on 2 March, and the coolest day was on 5 May when the temperature reached 18.2 °C.
  • The mean daily minimum temperature for Brisbane was 17.0 °C, which is 0.1 °C below the long-term average of 17.1 °C.
  • The coldest morning was 8.7 °C on 17 May, and the warmest morning was on 1 March when the minimum temperature was 24.1 °C.

Further information

Media
(03) 9669 4057

Extremes in autumn 2021
Hottest day 37.4 °C at University of Queensland Gatton on 2 Mar
Warmest days on average 26.6 °C at Amberley AMO
Coolest days on average 24.3 °C at Cape Moreton Lighthouse
Coldest day 17.1 °C at Redland (Alexandra Hills) on 5 May
Coldest night 1.8 °C at Canungra (Defence) on 17 May
Coolest nights on average 12.2 °C at Canungra (Defence)
Warmest nights on average 18.8 °C at Cape Moreton Lighthouse
Warmest night 24.1 °C at Brisbane on 1 Mar
24.1 °C at Cape Moreton Lighthouse on 1 Mar
Warmest on average overall 21.6 °C at Brisbane
Coolest on average overall 18.8 °C at Canungra (Defence)
Wettest overall 992.0 mm at Mt Tamborine Fern St
Wettest day 229.2 mm at Point Lookout on 23 Mar
Strongest wind gust 85 km/h at Cape Moreton Lighthouse on 16 Mar

Record highest autumn daily rainfall
New record
(mm)
Old
record
Years of
record
Wallen Wallen 183.0 on 23 Mar 177.0 on 15 May 2003 37
Point Lookout 229.2 on 23 Mar 193.0 on 17 Apr 2012 25



Record highest autumn total rainfall
New record
(mm)
Old
record
Years of
record
Average for
autumn
Point Lookout 879.8 789.4 in 2009 25 462.7
Mt Tarampa 321.3 281.4 in 2009 20 156.1

Highest autumn total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
autumn
Karragarra Island 793.3 824.6 in 1989* 454.7
Rocky Point Sugar Mill 803.4 887.8 in 1990* 414.7
Dunwich 903.3 1001.8 in 1988* 508.9
Greenbank Thompson Road 512.2 579.2 in 1996 264.6
Logan City Water Treatment Plant 601.0 723.1 in 1996 318.4
Mt Tamborine Fern St 992.0 1290.2 in 1996* 444.5
Capalaba Water Treat 547.8 763.3 in 1996* 349.4
Ormiston College 671.6 749.0 in 1990* 394.3

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




Summary statistics for autumn 2021
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
autumn
2021
Diff
from
average
Highest for
autumn
2021
Mean for
autumn
2021
Diff
from
average
Lowest for
autumn
2021
Total for
autumn
2021
Average
for
autumn
Rank of
autumn
2021
Fraction of
autumn
average
Amberley AMO 26.6 -0.3 36.6 2 Mar 13.2 -0.7 2.4 17 May 325.2 192.7 high 169%
Archerfield Airport 26.3 -0.2 34.4 2 Mar 15.1 -0.1 5.9 29 May 419.0 276.9 high 151%
Beaudesert Drumley Street 26.4 -0.4 35.1 2 Mar 13.4 -0.4 2.9 17 May 448.0 228.8 high 196%
Beerburrum Forest Station 25.7 -0.7 32.6 10 Apr 15.6 -0.1 7.1 29 May 532.2 408.8 high 130%
Brisbane 26.2 -0.8 33.2 2 Mar 17.0 -0.1 8.7 17 May 502.6 256.2 v high 196%
Brisbane Aero 25.3 -0.6 32.3 10 Apr 16.2 -0.2 7.5 17 May 521.2 283.5 high 184%
Canungra (Defence) 25.4   33.7 2 Mar 12.2   1.8 17 May 625.6
Cape Moreton Lighthouse 24.3 +0.2 29.9 2 Mar 18.8 -0.2 12.2 6 May 521.6 484.6 average 108%
Greenbank (Defence) 26.3   35.3 2 Mar 13.5   3.8 17 May 459.4
Logan City Water Treatment Plant 25.8 -0.6 32.6 2 Mar 16.2 +0.2 8.5 29 May 601.0 318.4 v high 189%
Redcliffe 25.5 -0.3 31.9 10 Apr 17.2 -0.5 9.0 17 May 557.0 305.2 high 183%
Redland (Alexandra Hills) 25.0   31.9 10 Apr 16.1   8.5 16 May 597.0
University of Queensland Gatton 26.4 -0.4 37.4 2 Mar 13.9 +0.2 4.1 17 May

Notes

The Seasonal climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Brisbane 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 Brisbane “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 11 am on Tuesday 1 June 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

Climate