Melbourne Metropolitan Area and Environs in summer 2010-11: Rainfall much more than that usually received

Located in the Central District at the head of Port Phillip Bay, Melbourne is Victoria's State Capital. Here, overnight minimum temperatures were much warmer than those usually experienced and averaged 15.9C (departure from normal 2C). Daytime maximum temperatures were near to those usually experienced and averaged 25.5C (departure from normal 0.2C). Total rainfall for the past summer (Dec 2010 to Feb 2011) was 306.0 mm, this being much more than that usually recorded (normal 154.9 mm, percentage of normal received 198%).

Rainfall

Some sites had their highest total summer rainfall on record.

Some sites had their highest total summer rainfall for at least 10 years.

Temperature

Minimum temperature

Some sites had their lowest summer temperature on record.

Some sites had their highest summer mean daily minimum temperature on record.

Some sites had their highest summer mean daily minimum temperature for at least 10 years.

Further information

Media
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Extremes in summer 2010-11
Hottest day 42.8 C at Avalon Airport on 31 Dec 2010
Warmest days on average 25.5 C at Coldstream
25.5 C at Melbourne Regional Office
Coolest days on average 20.8 C at Ferny Creek (Dunns Hill)
Coldest day 10.9 C at Ferny Creek (Dunns Hill) on 21 Dec 2010
Coldest night 4.3 C at Coldstream on 28 Dec 2010
Coolest nights on average 11.5 C at Ferny Creek (Dunns Hill)
Warmest nights on average 15.9 C at Melbourne Regional Office
Warmest night 24.5 C at Melbourne Regional Office on 1 Feb 2011
Wettest overall 508.8 mm at Ferny Creek (Dunns Hill)
Wettest day 140.8 mm at Moorabbin Airport on 5 Feb 2011
Highest wind gust 100 km/h at Ferny Creek (Dunns Hill) on 14 Jan 2011

Record highest total summer rainfall
Total rainfall
for summer 2010-11 (mm)
Previous highest
for summer
Years of
record
Average for
summer
Laverton RAAF 345.8 321.2 in 1972 70 133.2
Scoresby Research Institute 468.0 364.9 in 1993 60 184.4
Moorabbin Airport 427.2 291.9 in 1971 57 152.2
Bundoora (Latrobe University) 296.4 278.7 in 1993 32 156.0
Avalon Airport 260.0 245.1 in 1972 28 94.7
Cerberus 288.0 222.4 in 2004 21 131.8
Cranbourne Botanic Gardens 333.1 295.0 in 1993 21 175.5
Coldstream 403.2 217.6 in 2004 17 156.3
Ferny Creek (Dunns Hill) 508.8 374.8 in 2004 15 237.3
Viewbank (ARPANSA) 356.0 231.6 in 2004 12 163.2

Highest total summer rainfall for at least 10 years
Total rainfall
for summer 2010-11 (mm)
Most recent summer
this high or higher
Years since
higher
Average for
summer
Essendon Airport 267.4 281.9 in 1962 30 142.3
Melbourne Regional Office 306.0 334.2 in 1993 17 154.9



Record lowest summer temperature
Lowest temperature
in summer 2010-11 (C)
Previous lowest
for summer
Years of
record
Average for
summer
Viewbank (ARPANSA) 4.9 on 28 Dec 2010 5.0 on 20 Dec 1999 12 13.7



Record highest summer mean daily minimum temperature
Mean daily minimum
temperature
for summer 2010-11 (C)
Previous highest
for summer
Years of
record
Average for
summer
Coldstream 12.7 11.8 in 2007 16 11.0

Highest summer mean daily minimum temperature for at least 10 years
Mean daily minimum
temperature
for summer 2010-11 (C)
Most recent summer
this high or higher
Years since
higher
Average for
summer
Cerberus 13.9 14.5 in 2000 10 13.2
Cranbourne Botanic Gardens 13.5 14.3 in 2000 10 13.1



Summary statistics for summer 2010-11
Maximum temperatures
for summer
(C)
Minimum temperatures
for summer
(C)
Rainfall
for summer
(millimetres)
Mean for
summer
2010-11
Diff
from
average
Highest for
summer
2010-11
Mean for
summer
2010-11
Diff
from
average
Lowest for
summer
2010-11
Total for
summer
2010-11
Average
for
summer
Rank of
summer
2010-11
Fraction of
summer
average
East Central (district 86)
Bundoora (Latrobe University) 25.4 -0.6 40.8 31 Dec 2010 14.3 +0.8 5.5 28 Dec 2010 296.4 156.0 highest 190%
Cerberus 23.1 -0.7 38.7 31 Dec 2010 13.9 +0.7 6.0 22 Dec 2010 288.0 131.8 highest 219%
Coldstream 25.5 -1.2 39.2 31 Dec 2010 12.7 +1.7 4.3 28 Dec 2010 403.2 156.3 highest 258%
Cranbourne Botanic Gardens 23.9 -1.0 38.9 31 Dec 2010 13.5 +0.4 6.5 24 Dec 2010 333.1 175.5 highest 190%
Essendon Airport 25.0 -0.4 40.7 31 Dec 2010 14.2 +1.3 6.2 28 Dec 2010 267.4 142.3 v high 188%
Ferny Creek (Dunns Hill) 20.8 -0.7 34.5 1 Feb 2011 11.5 -0.2 5.3 28 Dec 2010 508.8 237.3 highest 214%
Melbourne Airport 24.8 -0.9 40.4 31 Dec 2010 13.7 +0.5 6.0 28 Dec 2010 272.8 135.2 v high 202%
Melbourne Regional Office 25.5 +0.2 41.1 31 Dec 2010 15.9 +2.0 9.0 28 Dec 2010 306.0 154.9 v high 198%
Moorabbin Airport 24.2 -1.0 40.2 31 Dec 2010 14.5 +0.9 7.8 28 Dec 2010 427.2 152.2 highest 281%
Scoresby Research Institute 24.8 -0.7 39.6 31 Dec 2010 13.7 +0.7 5.1 28 Dec 2010 468.0 184.4 highest 254%
Viewbank (ARPANSA) 25.4 -1.4 40.5 31 Dec 2010 14.2 +0.5 4.9 28 Dec 2010 356.0 163.2 highest 218%
West Central (district 87)
Avalon Airport 24.5 -0.9 42.8 31 Dec 2010 13.7 +0.4 5.2 22 Dec 2010 260.0 94.7 highest 275%
Laverton RAAF 24.3 -0.7 41.9 31 Dec 2010 14.4 +1.1 6.6 22 Dec 2010 345.8 133.2 highest 260%

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 10 am on Tuesday 1 March 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