Greater Melbourne in summer 2017-18: Warmer and wetter than average

Daytime and night-time temperatures were above average for all sites across the Greater Melbourne area. Rainfall was above average, mainly due to the wetter months of December and January, whilst February was drier than average.

A wet start and dry end to the season

  • Rainfall for the season started off wet with some stations across the Greater Melbourne area recording record December daily rainfall at the start of the month and record total December rainfall, January was also wetter than average for most stations. February was much drier than average with many stations recording less than 10 per cent of their average rainfall.

Warm days and nights

Melbourne (Olympic Park)

  • Total rainfall for Melbourne (Olympic Park) was 195.4 mm
  • The mean daily maximum temperature for Melbourne (Olympic Park) was 26.4 °C. The warmest day was 41.7 °C on 6 Jan, and the coolest day was on 2 Dec when the temperature reached 16.4 °C
  • The mean daily minimum temperature for Melbourne (Olympic Park) was 16.4 °C. The coldest morning was 10.8 °C on 5 Dec, and the warmest morning was on 29 Jan when the minimum temperature was 27.8 °C

Strong winds in the middle of February

  • Strong winds on the 14th of February caused power outages and downed trees across Greater Melbourne. Trains on the Hurtsbridge and Sandringham lines were delayed with trees falling onto the lines. The strongest wind gust recorded during this event was 109 km/h at St Kilda Harbour-RMYS.

Further information

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Extremes in summer 2017-18
Hottest day 43.1 °C at Laverton RAAF on 6 Jan 2018
Warmest days on average 28.1 °C at Coldstream
Coolest days on average 24.0 °C at Ferny Creek
Coldest day 11.8 °C at Ferny Creek on 3 Dec 2017
Coldest night 5.1 °C at Coldstream on 15 Feb 2018
Coolest nights on average 12.6 °C at Coldstream
Warmest nights on average 16.4 °C at Melbourne (Olympic Park)
Warmest night 28.5 °C at Moorabbin Airport on 29 Jan 2018
Warmest on average overall 21.4 °C at Melbourne (Olympic Park)
21.4 °C at Viewbank
Coolest on average overall 18.6 °C at Ferny Creek
Wettest overall 368.4 mm at Kinglake West
Driest overall 134.2 mm at Cerberus
Wettest day 112.4 mm at Kinglake West (Wallaby Creek) on 3 Dec 2017
Strongest wind gust 117 km/h at Wallan (Kilmore Gap) on 19 Dec 2017

Record highest summer mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Essendon Airport 15.2 = 15.2 in 2015 47 13.2
Wallan (Kilmore Gap) 12.9 = 12.9 in 2015 24 11.7

Highest summer mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
summer
Laverton RAAF 15.4 15.8 in 1980 13.4
Moorabbin Airport 15.5 15.6 in 1980 13.7



Record highest summer mean temperature
New record
(°C)
Old
record
Years of
record
Average for
summer
Coldstream 20.3 = 20.3 in 2015 23 19.1

Highest summer mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
summer
Moorabbin Airport 21.1 21.8 in 1980 19.5



Summary statistics for summer 2017-18
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
summer
2017-18
Diff
from
average
Highest for
summer
2017-18
Mean for
summer
2017-18
Diff
from
average
Lowest for
summer
2017-18
Total for
summer
2017-18
Average
for
summer
Rank of
summer
2017-18
Fraction of
summer
average
Coldstream 28.1 +1.2 40.3 19 Jan 2018 12.6 +1.4 5.1 15 Feb 2018 251.8 156.2 v high 161%
Cranbourne Botanic Gardens     41.1 19 Jan 2018 14.0 +0.9 6.5 1 Feb 2018 198.4 164.7 high 120%
Essendon Airport 27.4 +1.8 42.5 19 Jan 2018 15.2 +2.0 9.3 5 Dec 2017 220.2 140.2 high 157%
Ferny Creek 24.0   37.1 19 Jan 2018 13.2   6.9 8 Dec 2017 292.0
Frankston AWS 25.1 +1.0 38.1 19 Jan 2018 16.2 +1.1 11.0 1 Feb 2018
Laverton RAAF 26.5 +1.5 43.1 6 Jan 2018 15.4 +2.0 9.3 7 Dec 2017 150.2 131.1 high 115%
Melbourne (Olympic Park) 26.4   41.7 6 Jan 2018 16.4   10.8 5 Dec 2017 195.4
Melbourne Airport 27.2 +1.3 42.4 19 Jan 2018 14.4 +1.1 8.3 1 Feb 2018 196.8 132.8 high 148%
Moorabbin Airport 26.6 +1.3 42.3 6 Jan 2018 15.5 +1.8 9.0 1 Feb 2018 199.8 150.3 high 133%
Scoresby Research Institute 27.7 +2.1 41.0 19 Jan 2018 14.5 +1.4 7.3 1 Feb 2018 218.2 182.5 high 120%
Viewbank 28.0 +0.9 42.0 6 Jan 2018 14.8 +0.9 9.0 5 Dec 2017 238.0 157.3 v high 151%
Wallan (Kilmore Gap) 25.4 +1.4 38.4 19 Jan 2018 12.9 +1.2 6.4 1 Feb 2018 195.2 142.9 high 137%

Notes

The Seasonal climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater 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.

In September 2017 this summary was broadened to include data from observing sites in or near the Greater Melbourne “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 1 pm on Thursday 1 March 2018. 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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