Melbourne in autumn 2017: mild days and nights

Autumn rainfall was above average in the northwest of the Melbourne metropolitan area, while elsewhere it was mostly close to average. Both daytime and overnight temperatures were above average in all Melbourne suburbs.

Rainfall mostly near average

  • Rainfall across the Melbourne metropolitan area was generally close to average with above average rainfall in the northwest
  • Rainfall totals ranged from 89% of autumn average at Moorabbin to 143% of average at Bundoora
  • Main Ridge (Mornington Peninsula) recorded the highest rainfall total in Greater Melbourne during autumn with 309.3 mm
  • Heavy rainfall on the 10th April made significant contribution to the seasonal totals at many stations and delivered Bullengarook South its highest autumn daily rainfall on record

Mild days and nights

  • The season started with exceptionally high temperatures in March, followed by close to average temperatrues in April and May
  • Autumn daytime and overnight temperatures were warmer than average in all Melbourne suburbs
  • Mean maximum temperatures ranged from 0.9 °C above average at Cranbourne to 1.8 °C at Wallan (Kilmore Gap)
  • Mean minimum temperatures in all suburbs were closer to the average and ranged mostly between 0.5 °C and 1.0 °C above autumn mean
  • The highest temperature recorded in Greater Melbourne was 34.6 °C at Melbourne Airport on 19th March
  • At Melbourne (Olympic Park) the warmest day recorded 33.5  °C on 19 March, and the coldest night saw 5.6  °C on 16th May

Further information

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Extremes in autumn 2017
Hottest day 34.6 °C at Melbourne Airport on 19 Mar
Warmest days on average 22.2 °C at Viewbank
Coolest days on average 18.0 °C at Ferny Creek
Coldest day 8.3 °C at Ferny Creek on 30 May
Coldest night -0.6 °C at Coldstream on 4 May
Coolest nights on average 8.2 °C at Coldstream
Warmest nights on average 13.1 °C at Frankston AWS
Warmest night 21.7 °C at Melbourne (Olympic Park) on 16 Mar
Warmest on average overall 17.1 °C at Melbourne (Olympic Park)
Coolest on average overall 14.3 °C at Ferny Creek
Wettest overall 309.3 mm at Main Ridge
Driest overall 129.6 mm at Bonbeach (Carrum)
Wettest day 97.8 mm at Gisbourne (Rosslynne Reservoir) on 10 Apr
Strongest wind gust 94 km/h at Fawkner Beacon on 8 Apr

Record highest autumn daily rainfall
New record
(mm)
Old
record
Years of
record
Bullengarook South 77.0 on 10 Apr 58.0 on 24 Apr 2001 25



Highest autumn total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
autumn
Bundoora (Latrobe University) 219.4 263.2 in 1995* 152.9

* 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 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
autumn
2017
Diff
from
average
Highest for
autumn
2017
Mean for
autumn
2017
Diff
from
average
Lowest for
autumn
2017
Total for
autumn
2017
Average
for
autumn
Rank of
autumn
2017
Fraction of
autumn
average
Bundoora (Latrobe University) 21.7 +1.2 34.0 19 Mar 10.8 +0.7 2.2 4 May 219.4 152.9 v high 143%
Cerberus 20.9 +1.1 33.5 27 Mar 10.9 +0.6 2.9 5 May 186.8 176.8 average 106%
Coldstream 22.1 +1.4 33.9 15 Mar 8.2 +0.8 -0.6 4 May 176.0 173.8 average 101%
Cranbourne Botanic Gardens 20.8 +0.9 33.0 15 Mar 11.3 +0.9 3.9 5 May 218.1 181.5 high 120%
Essendon Airport 21.8 +1.7 34.1 19 Mar 11.5 +1.4 3.4 12 May 158.8 142.7 high 111%
Ferny Creek 18.0   29.0 19 Mar 10.7   2.9 31 May 283.8
Frankston AWS 20.5 +1.2 32.0 15 Mar 13.1 +0.6 5.6 31 May
Laverton RAAF 21.3 +1.0 33.9 15 Mar 11.1 +1.0 3.3 5 May 136.6 126.1 average 108%
Melbourne (Olympic Park) 21.6   33.5 19 Mar 12.6   5.6 16 May 174.8
Melbourne Airport 21.6 +1.2 34.6 19 Mar 10.9 +0.5 3.6 4 May 151.6 120.4 high 126%
Moorabbin Airport 21.7 +1.4 34.1 15 Mar 11.6 +0.9 3.6 16 May 156.2 175.4 average 89%
Scoresby Research Institute 21.9 +1.7 33.3 19 Mar 10.6 +0.3 2.1 4 May 194.6 210.9 average 92%
Viewbank 22.2 +1.0 34.1 19 Mar 10.7 +0.4 2.4 4 May 171.6 151.7 high 113%
Wallan (Kilmore Gap) 18.9 +1.8 32.0 1 Mar 10.2 +1.3 2.5 29 May 145.6 155.9 average 93%

Notes

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

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