Greater Melbourne in spring 2017: drier and warmer than average

Spring in Melbourne was drier than average, despite some heavy rain at times. Both daytime and night time temperatures were warmer than average, with several warm spells in September, October, and throughout the second half of November.

Drier than average

  • Spring rainfall totals were average to below average throughout Greater Melbourne
  • Rainfall totals ranged from 58% of average at Essendon Airport to 98% of average at Coldstream

Warmer than average

  • Mean maximum temperatures for spring were warmer than average at all sites
  • Melbourne (Olympic Park) had 15 days of 30 °C or more during spring (12 in November, three in October), exceeding the city's previous record of 12 such days in spring 2009 (at the old Regional Office site); Melbourne's long-term average is four days in spring of 30 °C or more
  • The season ended with two hot days for Greater Melbourne, with most sites having their hottest day of the season on either 29 or 30 November
  • Mean minimum temperatures were closer to the long-term average, but still warmer than average throughout Greater Melbourne
  • Spring began with a cold night, with 1 September being the coldest night of the season across most suburbs
  • Some sites had their highest spring mean daily maximum temperature on record, exceeding their records from 2015
  • On the 30th, Laverton RAAF had its warmest spring night (highest daily minimum temperature) on record
  • A few sites had their highest spring mean daily minimum temperature on record
  • Several sites, covering most areas of Greater Melbourne, had their warmest spring on record

Melbourne (Olympic Park)

  • Total rainfall for Melbourne (Olympic Park) was 126.0 mm
  • The mean daily maximum temperature for Melbourne (Olympic Park) was 21.5 °C. The warmest day was 35.8 °C on 29 Nov, and the coolest day was on 5 Sep when the temperature reached 13.3 °C
  • The mean daily minimum temperature for Melbourne (Olympic Park) was 11.6 °C. The coldest morning was 3.7 °C on 1 Sep, and the warmest morning was on 30 Nov when the minimum temperature was 22.5 °C

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Extremes in spring 2017
Hottest day 37.3 °C at Essendon Airport on 29 Nov
Warmest days on average 22.1 °C at Bundoora (Latrobe University)
22.1 °C at Essendon Airport
22.1 °C at Viewbank
Coolest days on average 17.7 °C at Ferny Creek
Coldest day 6.5 °C at Ferny Creek on 5 Sep
Coldest night -2.6 °C at Coldstream on 1 Sep
Coolest nights on average 7.6 °C at Coldstream
Warmest nights on average 11.6 °C at Melbourne (Olympic Park)
Warmest night 24.3 °C at Scoresby Research Institute on 30 Nov
Warmest on average overall 16.5 °C at Melbourne (Olympic Park)
Coolest on average overall 13.3 °C at Wallan (Kilmore Gap)
Wettest overall 302.8 mm at Ferny Creek
Driest overall 97.6 mm at Burnside
Wettest day 66.2 mm at Willowmavin (Avalon Station) on 17 Nov
Strongest wind gust 106 km/h at South Channel Island on 4 Sep
94 km/h at Melbourne Airport on 18 Sep

Record highest spring mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Essendon Airport 22.1 22.0 in 2015 47 19.3
Moorabbin Airport 21.4 21.3 in 2015 46 19.3
Bundoora (Latrobe University) 22.1 = 22.1 in 2015 33 19.8
Cerberus 20.3 = 20.3 in 2015 25 18.5
Frankston AWS 19.6 = 19.6 in 2015 25 17.9



Record highest spring daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Laverton RAAF 23.4 on 30 Nov 23.3 on 13 Oct 1977 75 8.4



Record highest spring mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Essendon Airport 10.3 = 10.3 in 2009 47 8.4
Moorabbin Airport 10.7 10.6 in 2011 46 9.5
Wallan (Kilmore Gap) 8.4 8.2 in 2015 23 7.1



Record highest spring mean temperature
New record
(°C)
Old
record
Years of
record
Average for
spring
Laverton RAAF 15.8 = 15.8 in 2015 73 13.8
Scoresby Research Institute 15.8 15.6 in 2015 57 14.0
Essendon Airport 16.2 16.1 in 2015 47 13.8
Melbourne Airport 15.8 = 15.8 in 2015 47 14.0
Moorabbin Airport 16.0 15.8 in 2015 46 14.4
Cerberus 14.9 14.7 in 2009 25 13.7
Coldstream 14.6 = 14.6 in 2011 22 13.5



Summary statistics for spring 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
spring
2017
Diff
from
average
Highest for
spring
2017
Mean for
spring
2017
Diff
from
average
Lowest for
spring
2017
Total for
spring
2017
Average
for
spring
Rank of
spring
2017
Fraction of
spring
average
Bundoora (Latrobe University) 22.1 +2.3 36.8 29 Nov 9.8 +0.8 0.0 1 Sep 115.3 192.9 v low 60%
Cerberus 20.3 +1.8 34.6 30 Nov 9.6 +0.6 2.8 3 Oct 182.4 188.2 average 97%
Coldstream 21.5 +1.6 34.9 29 Nov 7.6 +0.6 -2.6 1 Sep 204.0 208.1 average 98%
Essendon Airport 22.1 +2.8 37.3 29 Nov 10.3 +1.9 1.2 1 Sep 97.8 168.9 low 58%
Ferny Creek 17.7   30.6 30 Nov 9.1   1.5 14 Sep 302.8
Frankston AWS 19.6 +1.7 33.9 14 Nov 11.4 +0.7 4.8 1 Sep
Laverton RAAF 21.6 +2.3 37.0 29 Nov 10.0 +1.6 -0.5 1 Sep 106.4 156.8 low 68%
Melbourne (Olympic Park) 21.5   35.8 29 Nov 11.6   3.7 1 Sep 126.0
Melbourne Airport 22.0 +2.6 35.9 29 Nov 9.6 +0.9 1.1 1 Sep 115.6 161.8 low 71%
Moorabbin Airport 21.4 +2.1 36.5 30 Nov 10.7 +1.2 0.8 1 Sep 118.0 195.7 low 60%
Scoresby Research Institute 21.6 +2.6 35.4 29 Nov 9.9 +1.0 0.0 1 Sep 161.0 246.4 low 65%
Viewbank 22.1 +1.6 36.6 30 Nov 10.2 +0.8 0.8 1 Sep 132.2 188.9 average 70%
Wallan (Kilmore Gap) 18.3 +2.0 31.8 29 Nov 8.4 +1.3 1.1 5 Sep

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 10 am on Friday 1 December 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

Media
(03) 9669 4057
Enquiries