Melbourne Metropolitan Area in winter 2011: Warm and dry

  • Rainfall totals below average
  • Average daytime temperatures very much warmer than usual
  • Average minimum temperatures close to normal.

Rainfall

Rainfall totals around Melbourne where below average during winter. Both the Essendon and Melbourne Airport stations recorded half their long-term average rainfall. To the north, Melbourne Airport observed 33 rain days this winter whilst in the south-east, Cranbourne Botanic Gardens recorded almost twice as many with 64. The wettest station overall was Coldstream with 198.2 mm whilst the driest overall was Melbourne Airport with 58.0 mm. Melbourne Airport had their lowest total winter rainfall on record. The largest single day total was 21.4 mm recorded at Ferny Creek (Dunns Hill) on the 8th of June and then again on the 7th of July. There is a map of rainfall deciles below.

Temperature

Maximum temperature

Average maximum temperatures were warmer than usual this winter. Stations recorded average daytime temperatures that were generally 0.5 C to 1.5 C warmer than normal. The hottest day was the 3rd of August when Avalon Airport recorded 23.3 C. The warmest days on average were recorded at Melbourne Regional Office with 15.9 C and the coolest days on average were recorded at Cranbourne Botanic Gardens with 14.5 C. The coldest day was the 7th of July when Ferny Creek (Dunns Hill) recorded 4.6 C. Some sites had their highest winter mean daily maximum temperature on record. There is a map of maximum temperature anomalies below.

Minimum temperature

Average minimum temperatures were generally close to normal this winter. Most stations reported averages that were within 0.5 C of their long-term means. The exceptions were the Melbourne Regional Office and Essendon Airport whose average night-time temperatures were very much above average. The coldest minimum temperature was -2.1 C recorded at Coldstream on the 16th of June and Avalon Airport on the 16th of July. The coolest nights on average were at Coldstream with 4.2 C and the warmest nights on average were at Melbourne Regional Office with 8.2 C. The warmest night was the 4th of August when Scoresby Research Institute recorded 15.8 C. Some sites had their warmest winter night (highest daily minimum temperature) on record. There is a map of minimum temperature anomalies below.

Further information

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Extremes in winter 2011
Hottest day 23.3 C at Avalon Airport on 3 Aug
Warmest days on average 15.9 C at Melbourne Regional Office
Coolest days on average 14.5 C at Cranbourne Botanic Gardens
Coldest day 4.6 C at Ferny Creek (Dunns Hill) on 7 Jul
Coldest night -2.1 C at Coldstream on 16 Jun
-2.1 C at Avalon Airport on 16 Jul
Coolest nights on average 4.2 C at Coldstream
Warmest nights on average 8.2 C at Melbourne Regional Office
Warmest night 15.8 C at Scoresby Research Institute on 4 Aug
Warmest on average overall 12.1 C at Melbourne Regional Office
Coolest on average overall 9.5 C at Coldstream
Wettest overall 198.2 mm at Coldstream
Driest overall 58.0 mm at Melbourne Airport
Wettest day 21.4 mm at Ferny Creek (Dunns Hill) on 8 Jun
21.4 mm at Ferny Creek (Dunns Hill) on 7 Jul
Highest wind gust 102 km/h at Ferny Creek (Dunns Hill) on 21 Jun

Maps

Anomaly in mean maximum temperature

Map of Anomaly in mean maximum temperature

Anomaly in mean minimum temperature

Map of Anomaly in mean minimum temperature

Rainfall deciles

Map of Rainfall deciles


Record lowest total winter rainfall
Total rainfall
for winter 2011 (mm)
Previous driest
for winter
Years of
record
Average for
winter
Melbourne Airport 58.0 59.6 in 1982 40 119.3



Record highest winter mean daily maximum temperature
Mean daily maximum
temperature
for winter 2011 (C)
Previous warmest
for winter
Years of
record
Average for
winter
Melbourne Regional Office 15.9 = 15.9 in 2005 156 14.2
Scoresby Research Institute 14.8 = 14.8 in 2005 53 13.5
Melbourne Airport 14.8 = 14.8 in 2005 40 13.7



Record highest winter daily minimum temperature
Highest daily minimum
temperature
in winter 2011 (C)
Previous warmest
for winter
Years of
record
Average for
winter
Laverton RAAF 15.1 on 4 Aug 14.9 on 26 Aug 2004 68 5.4
Essendon Airport 14.7 on 4 Aug 14.2 on 31 Aug 2007 43 5.5



Summary statistics for winter 2011
Maximum temperatures
for winter
(C)
Minimum temperatures
for winter
(C)
Rainfall
for winter
(millimetres)
Mean for
winter
2011
Diff
from
average
Highest for
winter
2011
Mean for
winter
2011
Diff
from
average
Lowest for
winter
2011
Total for
winter
2011
Average
for
winter
Rank of
winter
2011
Fraction of
winter
average
East Central (district 86)
Bundoora (Latrobe University) 14.8 +0.8 22.1 3 Aug 6.2 +0.3 -0.1 16 Jul 105.0 160.5 low 65%
Cerberus 14.6 +0.5 22.8 3 Aug 6.6 +0.1 -1.0 16 Jul 152.0 220.7 low 69%
Coldstream 14.7 +0.7 22.3 3 Aug 4.2 +0.2 -2.1 16 Jun 198.2 193.5 average 102%
Cranbourne Botanic Gardens 14.5 +0.6 23.1 3 Aug 6.4 +0.1 0.0 16 Jul 163.3 223.3 low 73%
Essendon Airport 14.9 +1.3 22.0 3 Aug 6.4 +0.9 -1.1 16 Jul 65.4 131.1 v low 50%
Melbourne Airport 14.8 +1.1 21.2 4 Aug 6.2 +0.4 0.1 16 Jul 58.0 119.3 lowest 49%
Melbourne Regional Office 15.9 +1.7 23.2 3 Aug 8.2 +1.7 2.7 27 Jul 87.0 146.6 v low 59%
Moorabbin Airport 15.0 +0.8 23.2 3 Aug 6.8 +0.3 -0.9 16 Jul 117.0 184.3 v low 63%
Scoresby Research Institute 14.8 +1.3 22.2 3 Aug 6.4 +0.3 -0.6 16 Jul 134.8 223.5 v low 60%
Viewbank (ARPANSA) 15.0 +0.5 22.2 3 Aug 6.1 0.0 -0.2 16 Jul 130.4 156.4 low 83%
West Central (district 87)
Avalon Airport 15.3 +0.6 23.3 3 Aug 5.3 -0.1 -2.1 16 Jul 81.8 117.5 low 70%
Laverton RAAF 15.2 +1.0 22.3 25 Aug 6.0 +0.6 -1.8 16 Jul 58.8 121.8 v low 48%

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 Thursday 1 September 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