Melbourne Metropolitan Area in autumn 2011: Cold and wet days

  • Coldest average autumn maximum temperatures for some stations
  • The wettest autumn on record for some stations
  • Average night-time temperatures mixed.

Rainfall

Rainfall totals around Melbourne ranged from average to highest on record. The wettest station overall was Ferny Creek (Dunns Hill) with 394.8 mm and the driest was Avalon Airport with 85.0 mm. As the rainfall totals varied from station to station, so to did the number of rain days. Bundoora observed the least rain days in the Melbourne area, recording 31 for the season. At the other end of the scale, Cranbourne Botanic Gardens observed 54 rain days. The wettest single day was the 12th of April when Viewbank (ARPANSA) recorded 67.2 mm.

Temperature

Maximum temperature

A couple of stations recorded their coolest average Autumn daytime temperatures. Generally, stations that didn't break records still observed average daytime temperatures much lower than normal. The hottest day was the 13th of March when Essendon Airport recorded 33.4 C. The warmest days on average were at Melbourne Regional Office with 20.3 C. The coolest days on average were at Ferny Creek (Dunns Hill) with 14.8 C. The coldest day was the 11th of May when Ferny Creek (Dunns Hill) recorded 4.7 C.

Minimum temperature

Average minimum temperatures were mixed but most stations were within 1 C of their long-term means. The coldest night was the 10th of May when Coldstream recorded -1.0 C. Viewbank recorded their lowest autumn temperature on record on the 10th of May. The coolest nights on average were at Coldstream with 7.9 C, whilst the warmest nights on average were at Melbourne Regional Office with 12.1 C. The warmest night was the 13th of March when Melbourne Regional Office recorded 20.8 C.

Further information

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Extremes in autumn 2011
Hottest day 33.4 C at Essendon Airport on 13 Mar
Warmest days on average 20.3 C at Melbourne Regional Office
Coolest days on average 14.8 C at Ferny Creek (Dunns Hill)
Coldest day 4.7 C at Ferny Creek (Dunns Hill) on 11 May
Coldest night -1.0 C at Coldstream on 10 May
Coolest nights on average 7.9 C at Coldstream
Warmest nights on average 12.1 C at Melbourne Regional Office
Warmest night 20.8 C at Melbourne Regional Office on 13 Mar
Warmest on average overall 16.2 C at Melbourne Regional Office
Coolest on average overall 11.8 C at Ferny Creek (Dunns Hill)
Wettest overall 394.8 mm at Ferny Creek (Dunns Hill)
Driest overall 85.0 mm at Avalon Airport
Wettest day 67.2 mm at Viewbank (ARPANSA) on 12 Apr
Highest wind gust 83 km/h at Ferny Creek (Dunns Hill) on 22 May

Record highest total autumn rainfall
Total rainfall
for autumn 2011 (mm)
Previous wettest
for autumn
Years of
record
Average for
autumn
Coldstream 262.4 252.8 in 1999 17 173.7
Viewbank (ARPANSA) 260.8 233.6 in 2001 12 153.4

Record lowest autumn mean daily maximum temperature
Mean daily maximum
temperature
for autumn 2011 (C)
Previous coolest
for autumn
Years of
record
Average for
autumn
Avalon Airport 19.4 = 19.4 in 1996 15 20.6
Viewbank (ARPANSA) 19.6 20.3 in 2006 11 21.3

Record lowest autumn temperature
Lowest temperature
in autumn 2011 (C)
Previous coolest
for autumn
Years of
record
Average for
autumn
Viewbank (ARPANSA) -0.3 on 10 May -0.1 on 30 Apr 2009 12 10.1


Summary statistics for autumn 2011
Maximum temperatures
for autumn
(C)
Minimum temperatures
for autumn
(C)
Rainfall
for autumn
(millimetres)
Mean for
autumn
2011
Diff
from
average
Highest for
autumn
2011
Mean for
autumn
2011
Diff
from
average
Lowest for
autumn
2011
Total for
autumn
2011
Average
for
autumn
Rank of
autumn
2011
Fraction of
autumn
average
East Central (district 86)
Bundoora (Latrobe University) 19.2 -1.3 31.9 13 Mar 10.3 +0.3 0.4 10 May 217.6 151.4 v high 144%
Cerberus 18.7 -1.0 30.0 12 Mar 10.5 +0.3 2.7 30 May 222.0 175.6 high 126%
Coldstream 19.2 -1.5 31.7 13 Mar 7.9 +0.8 -1.0 10 May 262.4 173.7 highest 151%
Cranbourne Botanic Gardens 18.6 -1.3 31.5 13 Mar 10.2 -0.1 3.9 10 May 212.9 178.2 high 119%
Essendon Airport 19.4 -0.6 33.4 13 Mar 10.3 +0.4 1.0 10 May 135.2 143.7 average 94%
Ferny Creek (Dunns Hill) 14.8 -1.3 27.7 13 Mar 8.8 -0.6 1.6 12 May 394.8 262.8 high 150%
Melbourne Airport 19.3 -1.0 32.3 13 Mar 9.9 -0.5 2.3 10 May 116.6 121.0 average 96%
Melbourne Regional Office 20.3 0.0 32.5 13 Mar 12.1 +1.2 3.5 10 May 211.2 163.5 high 129%
Moorabbin Airport 19.3 -0.9 32.3 13 Mar 10.6 0.0 1.8 10 May 192.2 177.7 average 108%
Scoresby Research Institute 19.1 -1.0 31.2 13 Mar 9.9 -0.3 0.8 10 May 242.6 212.1 average 114%
Viewbank (ARPANSA) 19.6 -1.7 32.2 13 Mar 10.0 -0.1 -0.3 10 May 260.8 153.4 highest 170%
West Central (district 87)
Avalon Airport 19.4 -1.2 31.5 7 Mar 9.5 -0.3 1.2 31 May 85.0 98.7 average 86%
Laverton RAAF 19.2 -1.0 32.0 13 Mar 10.0 0.0 2.2 10 May 121.0 127.6 average 95%

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 2 pm on Wednesday 1 June 2011. 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