Greater Melbourne in 2017: warmer than average with close to average rainfall

Rainfall in Melbourne during 2017 was slightly below average overall. April and December were very wet months, but winter and spring tended to be drier than average. Mean maximum temperatures were above average throughout Greater Melbourne, with mean minimum temperatures close to average in most areas.

Slightly drier than average

  • Rainfall in 2017 was average to below average across most of Greater Melbourne, although a very wet December resulted in Coldstream having a wetter than average year
  • Annual rainfall totals ranged from 87% of average at Moorabbin Airport to 109% of average at Coldstream
  • After near-average rainfall for most parts of Melbourne earlier in the year, April was very wet, with rainfall more than double the monthly average in some northern and western suburbs
  • May, June, and July were much drier than average for most sites in Greater Melbourne, with some northern suburbs having their driest winter for more than 20 years
  • Rainfall in September, October, and November was below average in most suburbs, with spring totals drier than average throughout Greater Melbourne
  • In early December, a significant rain event resulted in the Melbourne region's wettest day of the year, with 112.4 mm recorded at Wallaby Creek in Kinglake West

Warmer than average

  • This was the first year since 1999 that no site in Greater Melbourne reached 40 degrees
  • Despite the lack of very hot days, mean maximum temperatures for the year were warmer than average in all Melbourne suburbs
  • Mean minimum temperatures were generally close to average, although Essendon Airport had nights that were 1.2 °C warmer than average for the year overall
  • January mean temperatures were warmer than average for all Melbourne suburbs and Laverton RAAF and Moorabbin Airport had their highest daily minimum temperatures on record
  • After a cooler than average February, March was very warm, with mean maximum temperatures between three and four degrees above average at most locations in the Melbourne metropolitan area
  • In June and July, persistent high pressure systems resulted in clear skies and light winds, keeping daytime temperatures generally warmer than average while overnight temperatures were cooler than average
  • On 3 July, Cerberus had its lowest temperature on record
  • In November, mean daytime temperatures were more than four degrees warmer than average in most suburbs, with several sites having their highest November mean daily maximum temperature on record

Melbourne (Olympic Park)

  • Total rainfall for Melbourne (Olympic Park) was 602.0 mm
  • The mean daily maximum temperature for Melbourne (Olympic Park) was 20.9 °C. The warmest day was 37.8 °C on 17 January, and the coolest day was on 3 August when the temperature reached 9.0 °C
  • The mean daily minimum temperature for Melbourne (Olympic Park) was 11.7 °C. The coldest morning was 0.8 °C on 2 July, and the warmest morning was on 8 January when the minimum temperature was 28.0 °C

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Extremes in 2017
Hottest day 39.1 °C at Laverton RAAF on 19 Dec
Warmest days on average 21.5 °C at Viewbank
Coolest days on average 17.1 °C at Ferny Creek
Coldest day 5.7 °C at Wallan (Kilmore Gap) on 27 Jun
Coldest night -5.3 °C at Coldstream on 2 Jul
Coolest nights on average 7.7 °C at Coldstream
Warmest nights on average 11.9 °C at Frankston AWS
Warmest night 28.9 °C at Laverton RAAF on 8 Jan
Warmest on average overall 16.3 °C at Melbourne (Olympic Park)
Coolest on average overall 13.1 °C at Ferny Creek
Wettest overall 1304.6 mm at Ferny Creek
Driest overall 439.2 mm at Melton Reservoir
Wettest day 112.4 mm at Kinglake West (Wallaby Creek) on 3 Dec
Strongest wind gust 117 km/h at Wallan (Kilmore Gap) on 19 Dec

Record highest daily minimum temperature
New record
(°C)
Old
record
Years of
record
Annual
average
Laverton RAAF 28.9 on 8 Jan = 28.9 on 21 Jan 1997 75 9.3
Moorabbin Airport 28.7 on 8 Jan 28.6 on 15 Jan 2014 47 10.1



Record lowest temperature
New record
(°C)
Old
record
Years of
record
Annual
average
Cerberus -3.0 on 3 Jul -2.9 on 19 Jul 2015 27 9.8



Summary statistics for 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean
for
2017
Diff
from
average
Highest
for
2017
Mean
for
2017
Diff
from
average
Lowest
for
2017
Total
for
2017
Average
annual
total
Rank
of
2017
Fraction
of annual
average
Coldstream 21.2 +0.8 38.2 17 Jan 7.7 +0.3 -5.3 2 Jul 798.6 734.8 high 109%
Essendon Airport 21.3 +1.6 38.9 17 Jan 10.5 +1.2 -2.0 1 Jul 551.6 587.4 average 94%
Ferny Creek 17.1   33.2 17 Jan 9.2   1.3 28 Aug 1304.6
Frankston AWS 19.4 +0.7 35.8 13 Dec 11.9 +0.2 2.0 1 Jul
Laverton RAAF 20.8 +1.1 39.1 19 Dec 10.2 +0.9 -1.7 1 Jul 475.0 535.7 average 89%
Melbourne (Olympic Park) 20.9   37.8 17 Jan 11.7   0.8 2 Jul 602.0
Melbourne Airport 21.1 +1.3 38.3 19 Dec 9.8 +0.2 -0.6 2 Jul 519.8 534.5 average 97%
Moorabbin Airport 20.8 +1.0 37.3 13 Dec 10.8 +0.7 -2.1 2 Jul 618.4 707.8 low 87%
Scoresby Research Institute 21.0 +1.4 37.5 17 Jan 9.8 +0.2 -0.6 1 Jul 813.8 858.5 average 95%
Viewbank 21.5 +0.7 38.2 17 Jan 10.0 0.0 -2.8 2 Jul 651.6 656.3 average 99%
Wallan (Kilmore Gap) 18.1 +1.3 38.5 17 Jan 8.7 +0.6 0.0 16 Jul

Notes

The Annual climate summary, generally published on the second working day of the year, 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 on Tuesday 9 January 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
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