Autumn 2012 summary for the Melbourne Area: Warm nights and wetter than normal

Autumn 2012 was characterised by:

  • Warmer than normal night-time temperatures
  • Above average rainfall
  • Mostly close to normal maximum temperatures.

Rainfall

Preliminary rainfall totals for autumn in the Melbourne area are above normal. March 2012 delivered above average rainfall totals to the Melbourne area whilst April totals were mostly closer to normal but with some areas of above average rainfall in the east. May turned out wetter than usual. The wettest station overall was Cerberus with 307.6 mm, while the driest is Avalon Airport with 123.0 mm. The wettest single day was 25 April when Scoresby Research Institute recorded 63.4 mm. Coldstream observed their highest autumn daily rainfall on record. Cerberus has observed their highest autumn rainfall on record.

Temperature

The warmest station on average was Melbourne Regional Office with 16.5 C whilst the coolest on average was Coldstream with 14.0 C.

Maximum temperature

Average maximum temperatures in the Melbourne area were mostly close to normal for autumn 2012. Most stations in the Melbourne area recorded average maximum temperatures more than 1 C below normal during March. During April, most stations recorded average maximum temperatures between 0.5 C and 1.5 C above normal. Maximum temperatures during May in the Melbourne area have been average to below average. The hottest day was 14 March when Avalon Airport recorded 33.0 C. Melbourne Regional Office recorded the warmest days on average with 20.8 C while Cerberus recorded the coolest with 19.3 C. The coldest day was 25 May when Scoresby Research Institute recorded 10.5 C.

Minimum temperature

Average minimum temperatures were warmer than normal in the Melbourne area during autumn 2012. Average minimum temperatures during March and April were generally close to normal with most stations recording monthly minimum temperatures within 0.5 C of their respective long-term averages. Average minimum temperatures during May have ranged from close to normal to very much above normal. The coldest night was 21 May when Coldstream recorded -1.1 C and Coldstream also recorded the coolest nights on average with 8.0 C. The warmest nights on average were recorded at Melbourne Regional Office with 12.2 C and Melbourne Regional Office also recorded the warmest night of the season on 15 March with 21.2 C.

Wind

The strongest wind gust was 89 km/h recorded at Avalon Airport on 6 April.

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Extremes in autumn 2012
Hottest day 33.0 C at Avalon Airport on 14 Mar
Warmest days on average 20.8 C at Melbourne Regional Office
Coolest days on average 19.3 C at Cerberus
Coldest day 10.5 C at Scoresby Research Institute on 25 May
Coldest night -1.1 C at Coldstream on 21 May
Coolest nights on average 8.0 C at Coldstream
Warmest nights on average 12.2 C at Melbourne Regional Office
Warmest night 21.2 C at Melbourne Regional Office on 15 Mar
Warmest on average overall 16.5 C at Melbourne Regional Office
Coolest on average overall 14.0 C at Coldstream
Wettest overall 307.6 mm at Cerberus
Driest overall 123.0 mm at Avalon Airport
Wettest day 63.4 mm at Scoresby Research Institute on 25 Apr
Highest wind gust 89 km/h at Avalon Airport on 6 Apr

Record highest autumn daily rainfall
Highest daily rainfall
in autumn 2012 (mm)
Previous wettest
for autumn
Years of
record
Coldstream 56.0 on 25 Apr 46.0 on 24 Apr 2001 18



Record highest total autumn rainfall
Total rainfall
for autumn 2012 (mm)
Previous wettest
for autumn
Years of
record
Average for
autumn
Cerberus 307.6 293.2 in 1995 21 181.9


Summary statistics for autumn 2012
Maximum temperatures
for autumn
(C)
Minimum temperatures
for autumn
(C)
Rainfall
for autumn
(millimetres)
Mean for
autumn
2012
Diff
from
average
Highest for
autumn
2012
Mean for
autumn
2012
Diff
from
average
Lowest for
autumn
2012
Total for
autumn
2012
Average
for
autumn
Rank of
autumn
2012
Fraction of
autumn
average
East Central (district 86)
Bundoora (Latrobe University) 20.1 -0.4 31.5 14 Mar 10.5 +0.5 1.1 21 May 196.6 152.8 high 129%
Cerberus 19.3 -0.4 32.0 14 Mar 10.8 +0.6 3.6 30 Apr 307.6 181.9 highest 169%
Coldstream 20.0 -0.6 31.3 14 Mar 8.0 +0.8 -1.1 21 May 228.8 176.8 high 129%
Cranbourne Botanic Gardens 19.4 -0.4 31.4 14 Mar 10.3 0.0 3.6 21 May 274.8 181.4 v high 151%
Essendon Airport 20.1 +0.1 31.4 14 Mar 10.5 +0.6 3.7 21 May 161.0 144.0 high 112%
Melbourne Airport 19.8 -0.5 30.8 14 Mar 10.1 -0.3 3.8 30 Apr 152.4 121.7 high 125%
Melbourne Regional Office 20.8 +0.5 31.6 14 Mar 12.2 +1.3 4.6 21 May 189.6 163.6 high 116%
Moorabbin Airport 19.9 -0.3 31.5 14 Mar 11.0 +0.4 3.0 30 Apr 214.0 178.3 high 120%
Scoresby Research Institute 19.8 -0.3 30.8 14 Mar 10.3 +0.1 3.3 21 May 290.6 213.5 v high 136%
Viewbank 20.4 -0.8 32.1 14 Mar 10.2 +0.1 1.1 21 May 201.2 157.1 high 128%
West Central (district 87)
Avalon Airport 20.6 +0.1 33.0 14 Mar 10.0 +0.2 2.7 21 May 123.0 99.5 high 124%
Laverton RAAF 20.2 0.0 31.5 14 Mar 10.1 +0.1 2.4 21 May 147.0 127.9 high 115%

Notes

A Seasonal Climate Summary is prepared to list the main features of the weather in Melbourne Metropolitan Area and Environs 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.

This statement has been prepared based on information available at 12 pm on Friday 1 June 2012. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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.

Further information

Media
(03) 9669 4057
Enquiries