Melbourne Metropolitan Area in Summer 2010-11: A very wet season.

  • Record breaking daily and seasonal rainfall at several stations
  • Above average night-time temperatures
  • Day time maximum temperatures average to below average

Rainfall

For the summer season rainfall over the Melbourne Metropolitan region was very much above average, with some areas highest on record, namely in the area surrounding Port Phillip Bay and to the north. The vast majority of the region recorded summer rainfall totals more than 200% of the usual mean summer rainfall. Moorabbin Airport received 356.0 mm over the season, 281% of mean summer rainfall. Many sites experienced their highest on record total summer rainfall while other sites had their highest total summer rainfall for at least 20 years.

The wettest site overall was Lilydale, which recorded 519.2 mm for the season. The wettest single day was 147.4 mm at Glen Waverley (Golf Course) on the 5th of February 2011.This day was marked by very heavy rainfall leading to flash flooding across the region (see Special Climate Statement 28). Moorabbin Airport and Glen Waverley Golf Course both recorded single day totals in excess of 140 mm, their highest daily rainfall for any time of year. A number of other sites also set new records for their highest summer daily rainfall total.

Maximum temperature

Average maximum temperatures were below average across the north and northwest of the Melbourne Metropolitan region during summer and near average elsewhere. The warmest days on average were observed at Coldstream and Melbourne Regional Office, both averaging 25.5 °C. The coolest days on average were observed at Ferny Creek (Dunns Hill) with 20.8 °C for the season.

Avalon Airport recorded the hottest day for the region on the 31st of December, a sweltering 42.8 °C. The lowest maximum was recorded on the 21st of December, with 10.9 °C at Ferny Creek (Dunns Hill).

Minimum temperature

Summer mean minimum temperatures were generally above to very much above average across the Melbourne Metropolitan area. The warmest nights were experienced at Melbourne Regional Office, averaging 15.9 °C, 2 °C above the long-term average for this site. The coolest nights on average were at Ferny Creek (Dunns Hill), averaging 11.5 °C for the summer, near to the long-term average at this site.

During the season, Coldstream recorded its warmest on record average January minimum temperature, 13.9 °C, as well as a record high mean daily minimum for summer with 12.7 °C. Viewbank (ARPANSA) recorded its coldest ever February daily minimum temperature, 7.2 °C, on the 7th of that month as well as its coolest summer temperature on record, 4.9 °C, on the 28th of December.

The warmest night was the 1st of February, on which Melbourne Regional Office recorded a balmy minimum of 24.5 °C. The coldest night in the Melbourne Metropolitan area for the season was at Sheoaks with 3.0 °C on 22 Dec 2010.

Further information

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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 and 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 3.0 °C at Sheoaks on 22 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
Warmest on average overall 20.7 °C at Melbourne Regional Office
Coolest on average overall 16.2 °C at Ferny Creek (Dunns Hill)
Wettest overall 519.2 mm at Lilydale
Wettest day 147.4 mm at Glen Waverley (Golf Course) on 5 Feb 2011
Highest wind gust 100 km/h at Point Wilson on 3 Dec 2010 and
Ferny Creek (Dunns Hill) on 14 Jan 2011

Record highest summer daily rainfall
Highest daily rainfall
in summer 2010-11 (mm)
Previous wettest
for summer
Years of
record
Ballan 119.4 on 5 Feb 2011 118.4 on 1 Dec 1933 137
Oakleigh (Metropolitan Golf Club) 138.7 on 5 Feb 2011 109.0 on 3 Feb 2005 99
Cheltenham Kingston Centre 112.0 on 5 Feb 2011 97.8 on 29 Jan 1963 98
Meredith (Darra) 136.0 on 5 Feb 2011 125.2 on 6 Feb 1973 98
Moorabbin Airport 140.8 on 5 Feb 2011 91.0 on 13 Jan 1998 61
Bonbeach (Carrum) 112.0 on 5 Feb 2011 98.0 on 3 Feb 2005 57
Glen Waverley (Golf Course) 147.4 on 5 Feb 2011 130.4 on 3 Feb 2005 39
Doncaster (Manningham Depot) 103.6 on 5 Feb 2011 101.6 on 3 Feb 2005 25

Record highest total summer rainfall
Total rainfall
for summer 2010-11 (mm)
Previous wettest
for summer
Years of
record
Average for
summer
Lancefield 430.0 321.0 in 1992 121 132.8
Lilydale 519.2 442.2 in 1903 120 186.7
Wonthaggi 320.5 273.7 in 1945 99 156.4
Croydon (Samuel Street) 488.2 369.2 in 1993 97 189.7
Warburton (O'Shannassy Reservoir (Quarte 454.4 449.0 in 1992 96 231.9
Cheltenham Kingston Centre 406.6 339.6 in 1992 94 163.3
Mitcham 417.0 356.6 in 1993 75 185.3
Laverton RAAF 345.8 321.2 in 1972 70 133.2
Scoresby Research Institute 468.0 364.9 in 1993 60 184.4
Springvale Necropolis 472.6 344.6 in 1993 60 175.1
Moorabbin Airport 427.2 291.9 in 1971 57 152.2
Bonbeach (Carrum) 354.6 293.6 in 1992 54 146.0
Croydon (Council Depot) 454.0 369.6 in 1993 46 184.6
Nyora (Post Office) 329.4 317.0 in 1992 39 187.9
Glen Waverley (Golf Course) 456.4 355.2 in 1993 35 193.5
Bundoora (Latrobe University) 296.4 278.7 in 1993 32 156.0
Altona (City Offices) 369.4 317.9 in 1972 31 148.3
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
Doncaster (Manningham Depot) 382.2 319.6 in 1993 20 173.2

Highest total summer rainfall for at least 20 years
Total rainfall
for summer 2010-11 (mm)
Most recent summer
at least this wet
Years since
wetter
Average for
summer
Ballan 363.8 365.0 in 1875 133 145.6
Prahran (Como House) 355.6 378.0 in 1903 105 154.2
Mornington 290.6 368.7 in 1903 94 142.9
Toorourrong Reservoir (Toorourrong) 342.4 359.4 in 1927 83 176.1
Meredith (Darra) 349.0 351.7 in 1970 39 143.6
Blackwood 331.0 331.5 in 1970 37 165.8
Bannockburn 215.6 243.3 in 1972 36 108.7
Yan Yean 260.6 305.0 in 1971 35 147.8
Essendon Airport 267.4 281.9 in 1962 30 142.3


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 v high 258%
Cranbourne Botanic Gardens 23.8 -1.1 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 v high 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%
Rhyll 22.9 -0.2 37.2 31 Dec 2010 15.4 +0.6 10.0 6 Feb 2011 231.2 123.1 v high 188%
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 v high 218%
Wonthaggi 23.5 +0.1 38.5 31 Dec 2010 13.5 +0.9 6.5 4 Jan 2011 320.5 156.4 highest 205%
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%
Grovedale (Geelong Airport) 23.9 -0.1 42.3 31 Dec 2010 13.1 +0.7 4.7 22 Dec 2010 230.0 111.0 v high 207%
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%
Sheoaks 24.1 -0.6 40.3 31 Dec 2010 12.1 +0.4 3.0 22 Dec 2010 275.8 112.2 high 246%

Notes

A Monthly 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 9 am on Thursday 3 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