Greater Melbourne in December 2017: A wetter than average month

A record rainfall event across Victoria at the start of the month set daily rainfall records at some stations across Greater Melbourne. Temperatures were warmer than average, especially night-time temperatures.

A very wet start to the month

  • It was a very wet start to the month with some sites, mostly across the northern and northeastern fringe of the metro area, receiving record daily totals on the second and third.
  • In general, it was the wettest December since 1993 in most of metropolitan Melbourne.
  • Kinglake West, Coldstream and Wallan (Kilmore Gap) had their highest December daily rainfall on record.
  • Four sites, including Kinglake West and Coldstream, had their highest total December rainfall on record. Kinglake West broke their December record in the first five days of the month.
  • Coldstream had their wettest month on record.
  • Some sites had their highest total December rainfall for at least 20 years. Four sites had their wettest December since the wet December of 1993.
  • A number of stations received more than 200 per cent of the December average: Coldstream recorded 183.6 mm for December, their average is 60 mm.

Warm nights across Greater Melbourne

Melbourne (Olympic Park)

  • Total rainfall for Melbourne (Olympic Park) was 128.4 mm.
  • The mean daily maximum temperature for Melbourne (Olympic Park) was 25.0 °C. The warmest day was 37.6 °C on the 13th, and the coolest day was on the 2nd when the temperature reached 16.4 °C.
  • The mean daily minimum temperature for Melbourne (Olympic Park) was 15.2 °C. The coldest morning was 10.8 °C on the 5th, and the warmest morning was on the 28th when the minimum temperature was 24.0 °C.

Severe weather on the 19th

  • Rainfall on the 19th produced localised flooding across Melbourne due to the high rate of rainfall received, though final daily totals were not as high as the record rainfall received at the start of the month.
  • Strong wind gusts, including 117 km/h at Wallan (Kilmore Gap) on the 19th, and hail, largely in the northern and eastern suburbs, was associated with the severe thunderstorms on the 19th.

Further information

Media
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Enquiries

Extremes in December 2017
Hottest day 39.1 °C at Laverton RAAF on the 19th
Warmest days on average 26.3 °C at Viewbank
Coolest days on average 21.9 °C at Ferny Creek
Coldest day 11.8 °C at Ferny Creek on the 3rd
Coldest night 6.6 °C at Coldstream on the 26th
Coolest nights on average 11.7 °C at Ferny Creek
Warmest nights on average 15.2 °C at Melbourne (Olympic Park)
Warmest night 24.0 °C at Melbourne (Olympic Park) on the 28th
Warmest on average overall 20.1 °C at Melbourne (Olympic Park)
Coolest on average overall 16.8 °C at Ferny Creek
Wettest overall 330.2 mm at Toolangi (Mount St Leonard DPI)*
Driest overall 42.4 mm at Melton Reservoir
Wettest day 112.4 mm at Kinglake West (Wallaby Creek) on the 3rd
Strongest wind gust 117 km/h at Wallan (Kilmore Gap) on the 19th

* note: there are missing data from the end of the month at this site so the final December total may be even higher



Record highest December daily rainfall
New record
(mm)
Old
record
Years of
record
Kinglake West 98.0 on the 3rd 56.4 on the 28th in 1999 26
Coldstream 50.0 on the 2nd 47.4 on the 26th in 2011 24
Wallan (Kilmore Gap) 47.2 on the 2nd 45.8 on the 22nd in 2007 24



Record highest December total rainfall
New record
(mm)
Old
record
Years of
record
Average for
December
Toolangi (Mount St Leonard DPI)* 330.2 326.8 in 1955 60 120.3
Cranbourne South 138.8 137.9 in 1993 50 64.2
Glen Waverley (Golf Course) 198.2 178.6 in 1993 42 79.1
Cranbourne Botanic Gardens 145.0 133.6 in 1993 28 67.9
Kinglake West 239.4 187.8 in 1991 26 87.9
Coldstream 183.6 145.6 in 2010 24 60.0

* note: there are missing data from the end of the month at this site so the final December total may be even higher


Highest December total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
December
Essendon Airport 150.4 152.7 in 1933* 52.3
Moorabbin Airport 134.4 146.6 in 1954* 60.5
Flemington Racecourse 144.7 151.8 in 1992* 53.7
Kinglake West (Wallaby Creek) 228.6 254.4 in 1993 88.0
Bonbeach (Carrum) 118.3 127.8 in 1993* 56.6
Scoresby Research Institute 163.8 186.6 in 1993* 76.5
Montrose 191.0 212.0 in 1985* 81.6
Eltham 142.8 146.6 in 1993* 66.0

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported




Record highest December mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Laverton RAAF 14.1 = 14.1 in 1965 74 12.0
Moorabbin Airport 14.6 14.3 in 2015 46 12.7
Coldstream 12.0 11.5 in 2007 23 9.7

Highest December mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
December
Cranbourne Botanic Gardens 13.3 13.4 in 1994 11.7



Summary statistics for December 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
December
2017
Diff
from
average
Highest for
December
2017
Mean for
December
2017
Diff
from
average
Lowest for
December
2017
Total for
December
2017
Average
for
December
Rank of
December
2017
Fraction of
December
average
Coldstream 26.1 +0.9 35.5 13th 12.0 +2.3 6.6 26th 183.6 60.0 highest 306%
Cranbourne Botanic Gardens 24.6 +1.1 36.4 13th 13.3 +1.6 9.8 5th 145.0 67.9 highest 214%
Essendon Airport 25.6 +1.1 38.5 19th 13.9 +2.0 9.3 5th 150.4 52.3 v high 288%
Ferny Creek 21.9   32.2 13th 11.7   6.9 8th 247.2
Frankston AWS 23.3 +0.8 35.8 13th 15.1 +1.3 11.5 8th
Laverton RAAF 24.8 +1.0 39.1 19th 14.1 +2.1 9.3 7th 82.2 46.1 high 178%
Melbourne (Olympic Park) 25.0   37.6 13th 15.2   10.8 5th 128.4
Melbourne Airport 25.6 +1.0 38.3 19th 13.3 +1.3 9.0 8th 118.8 50.4 v high 236%
Moorabbin Airport 24.7 +0.7 37.3 13th 14.6 +1.9 9.9 5th 134.4 60.5 v high 222%
Scoresby Research Institute 25.5 +1.4 36.6 13th 13.2 +1.3 7.8 7th 163.8 76.5 v high 214%
Viewbank 26.3 +0.6 37.7 19th 13.7 +1.0 9.0 5th 155.2 70.6 v high 220%
Wallan (Kilmore Gap) 23.6 +1.4 33.8 19th 11.7 +1.5 6.7 8th 109.4 47.2 v high 232%

Daily maximum temperatures for December 2017
12345678910111213141516171819202122232425262728293031
Bundoora (Latrobe University)25.217.216.422.822.723.719.424.922.429.037.325.027.533.337.225.8
Cerberus22.817.417.417.720.520.521.618.320.620.319.421.837.320.922.422.624.029.036.523.621.022.421.6
Coldstream22.917.016.818.122.824.025.020.024.125.324.630.135.524.429.427.329.033.235.025.525.830.031.421.223.729.932.931.925.821.026.7
Cranbourne Botanic Gardens22.018.516.717.320.721.422.119.523.522.620.823.536.422.525.328.326.131.236.223.325.026.520.627.834.031.623.920.425.4
Essendon Airport24.315.616.417.123.522.423.319.024.423.722.028.137.824.125.825.225.733.838.525.524.227.830.920.221.830.334.733.125.623.027.2
Ferny Creek20.414.011.813.818.419.420.316.319.420.520.125.932.220.424.322.423.728.931.319.920.625.226.116.519.025.629.428.523.917.422.5
Frankston AWS22.317.416.117.821.521.719.717.219.821.420.624.935.821.424.224.026.030.131.121.022.924.825.019.821.128.933.129.321.419.022.0
Laverton RAAF23.315.917.217.921.421.722.519.024.321.220.928.137.724.724.023.024.131.439.124.922.425.127.320.121.527.736.033.624.522.724.9
Melbourne (Olympic Park)23.516.417.117.522.821.321.918.723.022.220.726.437.623.126.424.624.533.037.424.523.727.730.219.421.430.534.532.824.421.325.7
Melbourne Airport24.715.116.416.422.322.423.619.824.623.621.827.937.425.426.125.125.633.838.324.824.628.731.520.121.530.134.732.724.822.226.2
Moorabbin Airport23.716.817.018.023.122.521.318.722.821.420.326.337.322.024.924.027.730.337.223.723.025.627.419.522.329.534.932.825.221.323.8
Scoresby Research Institute23.616.417.517.122.323.523.519.523.423.422.527.836.623.727.825.927.633.635.923.924.428.929.421.022.929.833.431.526.421.326.0
Viewbank24.815.917.716.923.724.324.620.624.725.323.027.837.525.328.626.529.233.737.725.225.229.430.721.123.530.234.533.125.421.727.4
Wallan (Kilmore Gap)21.612.012.611.920.220.723.317.321.523.621.527.033.223.327.025.225.130.733.823.023.227.628.317.120.927.230.229.026.220.726.0
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily minimum temperatures for December 2017
12345678910111213141516171819202122232425262728293031
Bundoora (Latrobe University)20.813.710.09.210.79.110.210.912.914.613.121.111.111.620.615.310.4
Cerberus18.614.712.512.88.214.510.110.410.49.814.713.911.318.59.59.713.513.719.313.510.912.99.9
Coldstream18.814.011.77.36.98.27.010.08.213.514.810.510.119.38.011.39.913.619.014.88.18.910.615.111.26.612.220.318.014.59.3
Cranbourne Botanic Gardens19.913.511.510.09.813.010.410.89.914.913.912.211.520.010.111.114.213.812.810.312.012.913.821.616.317.810.3
Essendon Airport20.513.810.611.09.312.29.89.911.512.614.715.213.320.113.012.315.215.320.015.710.312.412.914.114.610.816.223.018.213.59.7
Ferny Creek18.511.08.18.48.510.08.66.98.810.411.110.614.017.39.410.511.214.219.511.98.710.612.611.09.58.716.920.414.910.58.7
Frankston AWS20.914.112.311.912.014.112.211.512.115.515.515.315.518.413.013.615.816.819.315.014.014.814.316.014.213.916.122.617.416.612.6
Laverton RAAF20.614.210.812.010.214.79.39.411.210.915.115.413.020.213.011.016.215.119.614.69.415.411.714.315.214.916.023.118.313.79.3
Melbourne (Olympic Park)21.514.711.512.410.813.611.611.412.714.516.415.815.820.514.113.815.717.119.715.812.313.614.715.815.112.517.324.018.615.612.0
Melbourne Airport20.313.410.510.69.811.49.59.010.511.913.114.612.920.412.511.312.214.620.015.09.811.712.413.612.810.016.822.417.813.09.0
Moorabbin Airport20.714.413.113.09.913.710.912.712.814.115.415.113.119.511.712.413.320.215.413.812.813.916.014.310.815.222.717.915.612.5
Scoresby Research Institute19.913.711.68.78.411.77.810.210.011.715.013.814.120.19.512.113.016.419.914.99.610.612.114.413.09.215.121.317.413.810.4
Viewbank21.013.710.79.89.011.29.410.111.113.415.413.813.620.811.312.414.015.619.115.110.611.713.214.413.810.116.521.818.214.211.0
Wallan (Kilmore Gap)17.310.97.77.87.810.09.26.79.910.611.010.613.818.49.510.611.414.321.313.59.010.512.110.89.38.916.119.615.611.58.3
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily rainfall for December 2017
12345678910111213141516171819202122232425262728293031
Berwick (Buchanan Road) 7.0 37.2 47.0 7.0 0.2 - - 37.4 - - - - - - - - - - - 24.6 - - - - - - - - - 11.0 0.8
Bonbeach (Carrum) 30.4 7.0 21.0 2.0 - - - 29.0 - - - - - - - - - - - 15.5 - - - - - - - - - 13.4
Bullengarook East 5.4 26.4 21.4 9.4 0.8 - - - - - - - - - - - - - - - - - - - - - - - 6.0 2.6 0.2
Bundoora (Latrobe University) 3.6 36.8 55.0 2.2 - - 21.0 - - - - - - - - - - - 12.2 0.4









Burnside 3.4 22.0 9.6 4.8 2.4 - - 11.0 - - - - - - - - - - - - - - - 1.8 - - - - - 11.2 -
Cape Schanck 17.6 13.4 23.2 1.8 0.8 - - 4.6 - - - - - - - - - - - 1.2 - - - - - - - 0.8 0.4 13.0
Cerberus 11.0 20.6 23.0 0.4 - - - 5.4 2.0 - - - - - - - - - - 3.4 0.2 - - - - - - - 0.6 8.4 0.6
Coldstream 3.6 50.0 28.6 7.8 0.8 - - 45.2 - - - - - - - - - - - 19.8 - - - 0.4 - - - - 0.2 26.0 1.2
Cranbourne Botanic Gardens 7.2 41.0 28.0 1.7 2.0 - - 22.5 1.8 - - - - - - - - - - 20.2 - - - - - - - - 0.2 20.2 0.2
Cranbourne South 49.4 - 26.2 - 4.5 - - 21.4 2.1 - - - - - - - - - - 18.0 - - - - - - - - - 17.2 -
Dromana Sussex Farm 21.0 28.4 25.4 1.8 - - - 4.4 1.0 - - - - - - - - - - 5.4 - - - - - - - - 0.4 8.6 0.4
Drysdale (Brimdale) 13.6 20.6 23.0 1.6 0.6 0.2 - 4.8 0.8 - - - - - - - - - - - - - - - - - - - - 5.4 0.4
Essendon Airport 1.6 33.6 33.8 24.8 2.2 - - 30.2 - - - - - - - - - - - 15.2 0.8 - - 0.8 - - - - 1.6 5.6 0.2
Ferny Creek 4.4 50.8 89.6 14.4 4.4 - - 52.6 - - - - -
- - - - - 25.4 - - - 1.8 - - - - 1.0 1.8 1.0
Flemington Racecourse - 22.0 58.0 18.0 5.6 - - 28.0 - - - - - - - - - - - 1.7 0.5 0.5 - 1.0 0.4 - - - 1.0 8.0 -
Gisbourne (Rosslynne Reservoir) 6.2 20.6 22.4 8.6 - - - 0.2 - - - - - - - - - - - 3.0 - - - - 0.4 - - - 2.4 - -
Glen Waverley (Golf Course) 4.2 32.0 61.2 3.0 1.0 - - 70.0 - - - - - - - - - - - 16.8 - - - 0.4 - - - - 0.6 9.0 -
Greenvale Reservoir 7.0 31.6 20.8 31.2

- 21.8
- -


-

- -



0.4

- -

1.0
Hawthorn (Scotch College) - 68.0 1.6 - - 27.5 - - - - - - - - - - 16.4 - - - 0.3 - - 0.3 - -
Healesville (Valley View Farm) 1.8 62.2 32.0 7.4 4.0 - - 43.8 3.6 - - - - - - - - - - 11.0 - - - 0.6 - - - - 0.2 25.0 0.6
Kinglake West 8.0 78.4 98.0 5.8 1.6 - - 18.6 - - - - - - - - - - - 17.4 1.2 - - 1.2 - - - - 2.4 6.4 0.4
Kinglake West (Wallaby Creek) 7.8 76.0 112 9.4

- 22.2
- -


-

- -



0.4 0.4
- -


Koo Wee Rup - 23.4 31.0 4.8 - - - 29.0 0.6 - - - - - - - - - - 26.6 - - - - - - - - 0.4 13.8 -
Lang Lang - 39.2 37.0 4.4 0.8 - - 30.0 5.4 - - - - - - - - - - 33.0 - - - - - - - - 0.4 17.6 -
Laverton RAAF 4.8 25.6 25.6 4.4 1.0 - - 12.6 0.2 - - - - - - - - - - - - - - 0.4 - - - - 0.2 7.2 0.2
Main Ridge 84.0 - - - 7.8 - - - - - - - - - - 12.4 4.2 - - - - - - - 1.2 - 6.2 2.0
Melbourne (Olympic Park) 1.8 20.6 43.8 5.4 1.8 - - 25.2 - - - - - - - - - - - 20.6 - - - 0.4 - - - - 0.2 8.4 0.2
Melbourne Airport 1.0 31.8 16.2 10.8 3.6 0.2 - 19.4 - - - - - - - - - - - 16.0 0.2 - - 0.4 - - - - 4.8 13.6 0.8
Melton Reservoir - 17.6 12.0 0.6 - 1.0 - 9.8 - - - - - - - - - - - - - - - - - - - - 1.4 - -
Merricks Stonier's Winery 17.0 54.8 0.2 - - 7.0 0.7 - - - - - - - - - - 5.8 - - - - - - - 0.6 6.6 - -
Mitcham 1.2 41.0 68.0 5.4

- 37.6 0.2 - -


-

- -



0.6

- -

0.6
Montrose 4.8 55.0 42.0 8.2 3.8 - - 35.0 - - - - - - - - - - - 25.2 - - - 0.8 - - - - 0.2 15.2 0.8
Moorabbin Airport 4.6 19.0 44.6 0.8 - - - 32.4 - - - - - - - - - - - 17.0 - - - - - - - - - 15.6 0.4
Mornington 65.2


























Newham (Cobaw) 3.0 31.0 4.0 1.6 - - - 1.6 - - - - - - - - - - - 9.0 - - - - - - - - - 4.0
Oakleigh (Metropolitan Golf Club) 6.2 21.6 46.5 2.4 - - - 29.2 - - - - - - - - - - - 13.8 - - - - - - - - - 11.4
Preston Reservoir 0.4 42.2 50.8 12.6
0.2 - 33.2
- -


-

- -



0.4 0.2
- -

0.2
Ringwood North 1.4 38.0 48.6 2.6 1.0 - - 28.6 0.6 - - - - - - - - - - 16.8 - - - 1.2 - - - - - 11.8 -
Romsey 8.2 34.2 10.6 1.6 2.0 - - 0.4 - - - - - - - - - - - 12.2 35.2 - - 0.2 - - - - 5.4
Rosebud (Country Club) 14.2 32.6 - 30.0 - - - 5.6 - - - - - - - - - - - 6.0 - - - - - - 2.0 - - 7.2
Scoresby Research Institute 2.6 43.2 40.8 3.2 2.2 - - 41.0 - - - - - - - - - - - 20.4 0.2 - - - 0.2 - - - 1.0 8.8 0.2
Shoreham 12.4 32.0 - - 28.6 - - 9.0 - - - - - - - - - 12.2 - - - - 7.2 - - - - - - - -
Springvale (Sandown) - 27.2 30.0 7.0 - - - 45.5 - - - - - - - - - - - 12.6 - - - - - - - - - 13.4
Springvale Necropolis - 75.0 - - - 53.0 - - - - - - - - - - - 15.0 - - - - - - - - - - -
Toolangi (Mount St Leonard DPI) - 251 1.4 - - 49.0 - - - - - - - - - - - 28.4 - -
Toorourrong Reservoir (Toorourrong) 4.0 40.0 27.8 7.8

- 21.6
- -


-

- -



0.4

- -

0.2
Viewbank 2.8 32.6 60.0 5.0 3.6 - - 23.4 - - - - - - - - - - - 16.0 0.2 - - 0.8 - - - - 1.6 7.8 1.4
Wallan 4.4 34.0 18.2 20.0 4.6 - - 9.2 - - - - - - - - - - - 18.8 - - - 0.6 - - - - 0.6 9.4
Wallan (Kilmore Gap) 4.0 47.2 21.6 12.4 13.6 - - - - - - - - - - - - - - - 6.4 - - 0.2 0.2 - - - 0.4 3.4 -
Warburton (O'Shannassy Reservoir (Quarte 3.0 75.6 19.4


- 20.0
- -


-

- -



1.8

- -


Willowmavin (Avalon Station) 6.2 37.0 5.0 10.2 3.6 - - 1.8 - - - - - - - - - - - 13.8 - - - - - - - - - 16.8 -
Woodend 10.8 24.6 11.8 6.6 1.6 0.2 - - - - - - - - - - - - - 8.6 - - - 0.2 - - - - 0.5 11.8 0.5
Yan Yean 1.4 34.6 28.4 6.0

- 21.0 0.2 - -





- -



0.8

- -

0.4
Yarra River @ Warrandyte 2.0 33.4 65.2 4.8 0.2 - - 33.6 - - - - - - - - - - - 19.6 0.2 - - 0.8 0.2 - - - 0.2 12.8 0.4
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Melbourne using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

In September 2017 this summary was broadened to include data from observing sites in or near the Greater Melbourne “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 9 am on Tuesday 9 January 2018. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites 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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.