Melbourne in autumn 2015: below-average rainfall and temperatures

Maximum and minimum temperatures for autumn were generally near average to slightly cooler than average across Melbourne with average to below-average rainfall.

  • Average to below-average rainfall
  • Temperatures slightly below average

Autumn rainfall was generally below average in the Melbourne area, despite good falls on 1 March, moderate falls through the second half of April, and some scattered moderate falls during May. Ferny Creek recorded the two highest daily totals with 39.6 mm to 9am on 21 May and 29.8 mm on 1 March. Coldstream recorded almost exactly its average autumn rainfall, while Laverton RAAF recorded the largest departure from the long-term average at 63% of mean rainfall and the other sites ranged between about 70% and 90% of mean rainfall.

Both maximum and minimum temperatures were slightly below average across Melbourne during autumn, with nearly all sites recording anomalies within one degree of average. Coldstream dropped below zero several times during May, recording an overnight low of −1.7 °C on the 26th, the coldest night of the season in the Melbourne area.

Strong to gale force winds were recorded around Melbourne numerous times throughout the season. Avalon Airport recorded the highest maximum wind gust for the season with 87 km/h on 5 May. Thunderstorms on 19 March coincided with an 83 km/h maximum wind gust at St Kilda Harbour.

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Extremes in autumn 2015
Hottest day 35.6 °C at Laverton RAAF on 19 Mar
Warmest days on average 20.2 °C at Coldstream
Coolest days on average 15.7 °C at Ferny Creek
Coldest day 7.7 °C at Ferny Creek on 13 May
Coldest night -1.7 °C at Coldstream on 26 May
Coolest nights on average 7.2 °C at Coldstream
Warmest nights on average 11.2 °C at Melbourne (Olympic Park)
Warmest night 17.8 °C at Melbourne (Olympic Park) on 18 Mar
Warmest on average overall 15.4 °C at Melbourne (Olympic Park)
Coolest on average overall 12.1 °C at Ferny Creek
Wettest overall 344.4 mm at Ferny Creek
Driest overall 80.2 mm at Laverton RAAF
Wettest day 39.6 mm at Ferny Creek on 21 May
Strongest wind gust 87 km/h at Avalon Airport on 5 May

Lowest autumn mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Years since
lower
Average for
autumn
Melbourne Airport 9.4 9.0 in 1984 31 10.4



Lowest autumn mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Years since
lower
Average for
autumn
Cerberus 14.3 13.7 in 1995 20 15.0



Summary statistics for autumn 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
autumn
2015
Diff
from
average
Highest for
autumn
2015
Mean for
autumn
2015
Diff
from
average
Lowest for
autumn
2015
Total for
autumn
2015
Average
for
autumn
Rank of
autumn
2015
Fraction of
autumn
average
Avalon Airport 20.0 -0.7 34.3 19 Mar 9.5 -0.4 1.4 26 May 87.8 97.7 average 90%
Bundoora (Latrobe University) 19.8 -0.7 33.2 19 Mar 9.8 -0.3 2.0 26 May 125.6 150.9 low 83%
Cerberus 19.0 -0.8 31.5 19 Mar 9.6 -0.7 1.2 26 May 146.4 176.8 average 83%
Coldstream 20.2 -0.5 33.5 19 Mar 7.2 -0.1 -1.7 26 May 173.4 173.7 average 100%
Cranbourne Botanic Gardens 19.4 -0.5 32.1 19 Mar 9.6 -0.8 3.9 21 Apr 160.2 178.3 average 90%
Essendon Airport 20.1 0.0 34.0 19 Mar 9.8 -0.2 2.8 26 May 116.8 142.9 average 82%
Ferny Creek 15.7   28.6 19 Mar 8.5   1.7 13 May 344.4
Laverton RAAF 19.9 -0.3 35.6 19 Mar 9.7 -0.4 3.0 24 May 80.2 126.1 low 64%
Melbourne (Olympic Park) 19.7   33.5 19 Mar 11.2   5.4 26 May 97.4
Melbourne Airport 20.0 -0.3 34.1 19 Mar 9.4 -1.0 3.3 25 May 85.8 120.0 low 72%
Moorabbin Airport 19.7 -0.6 33.2 19 Mar 10.2 -0.5 3.4 26 May 129.0 175.9 low 73%
Scoresby Research Institute 19.8 -0.3 33.2 19 Mar 9.3 -0.9 0.9 24 May 162.6 211.3 low 77%
Viewbank 20.1 -1.1 32.8 19 Mar 9.5 -0.7 2.4 26 May 119.2 151.7 low 79%

Notes

A Seasonal Climate Summary is prepared to list 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. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 12 pm on Monday 1 June 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

The ACORN-SAT dataset is used for temperature area averages.

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