Victoria in December 2009

Generally warm with near normal rainfall.

Summary

December rainfall was close to normal in most Districts, slightly above normal in the northwest of the State, and slightly below normal in the east.

Daytime temperatures were above normal throughout, averaging between 2 and 3 deg C above normal in the far southwest, the northeast and east, and between 1 and 2 deg C above normal in other Districts.

Overnight temperatures were above normal by about half a deg C in most Districts, the exception being a small area near the Grampians, where overnight temperatures were about half a deg C below normal.

Melbourne's average maximum temperature was 25.9 deg C (normal: 24.2 deg C), whilst the city's overnight minimum averaged 14.7 deg C (normal: 12.9 deg C). 55.0 mm of rain fell (normal: 59.1 mm).

The warmth during the month may be explained in terms of the persistence of high pressure systems over the north Tasman Sea, Mean Sea Level Pressures being up to 4 hPa above long-term normals in this region, which directed northerly winds across the State.

Some sites had their highest December temperature on record.

Some sites had their coldest December day (lowest maximum temperature) on record.

Some sites had their highest December mean daily maximum temperature for at least 10 years.

Some sites had their warmest December night (highest daily minimum temperature) on record.

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

Further information

Media
(03) 9669 4057
Enquiries

Maps

Anomaly in mean maximum temperature

Map of Anomaly in mean maximum temperature

Mean maximum temperature

Map of Mean maximum temperature

Anomaly in mean minimum temperature

Map of Anomaly in mean minimum temperature

Mean minimum temperature

Map of Mean minimum temperature

Rainfall deciles

Map of Rainfall deciles

Rainfall totals

Map of Rainfall totals


Record highest December temperature
Highest temperature
in December 2009 (C)
Previous highest
for December
Years of
record
Average for
December
Mallacoota 41.6 on the 17th 37.7 on the 21st in 2005 17 21.8



Record lowest December daily maximum temperature
Lowest daily maximum
temperature
in December 2009 (C)
Previous lowest
for December
Years of
record
Average for
December
Shepparton Airport 18.7 on the 8th 19.4 on the 23rd in 2007 14 28.7



Highest December mean daily maximum temperature for at least 10 years
Mean daily maximum
temperature
for December 2009 (C)
Most recent higher
for December
Years since
higher
Average for
December
Kyabram DPI 30.5 30.7 in 1994 15 27.9
Tatura Inst Sustainable Ag 29.3 31.2 in 1994 15 27.3



Record highest December daily minimum temperature
Highest daily minimum
temperature
in December 2009 (C)
Previous highest
for December
Years of
record
Average for
December
Mildura Airport 28.9 on the 24th = 28.9 on the 4th in 1970 64 14.8
Echuca Aerodrome 29.0 on the 24th 27.5 on the 7th in 1990 53 13.4
Tatura Inst Sustainable Ag 27.2 on the 24th 24.5 on the 11th in 1980 45 12.2
Kyabram DPI 27.4 on the 24th 26.5 on the 7th in 1990 43 12.4
Strathbogie 23.1 on the 24th 22.5 on the 7th in 1990 30 9.3
Bendigo Airport 24.9 on the 24th 22.6 on the 22nd in 2006 19 11.5
Wallan (Kilmore Gap) 23.7 on the 24th 23.2 on the 12th in 1998 17 9.9
Mount Nowa Nowa 23.6 on the 17th 22.7 on the 31st in 2005 15 11.8
Shepparton Airport 26.7 on the 24th 25.3 on the 22nd in 2006 14 12.3
Stawell Aerodrome 23.5 on the 24th 22.1 on the 12th in 1998 14 11.0
Swan Hill Aerodrome 30.1 on the 24th 24.8 on the 22nd in 2006 14 13.2



Highest December mean daily minimum temperature for at least 10 years
Mean daily minimum
temperature
for December 2009 (C)
Most recent higher
for December
Years since
higher
Average for
December
Gabo Island Lighthouse 15.5 15.7 in 1980 29 14.3



Summary statistics for December 2009
Maximum temperatures
for December
(C)
Minimum temperatures
for December
(C)
Rainfall
for December
(millimetres)
Mean for
December
2009
Diff
from
average
Highest for
December
2009
Mean for
December
2009
Diff
from
average
Lowest for
December
2009
Total for
December
2009
Average
for
December
Rank of
December
2009
Fraction of
December
average
North Mallee (district 76)
Mildura Airport 31.5 +1.4 40.9 16th 15.6 +0.8 8.8 9th 13.0 23.3 average 56%
Ouyen (Post Office) 31.2 +1.0 41.6 16th 14.9 +1.3 8.5 11th 18.4 24.5 average 75%
Walpeup Research 31.0 +1.3 42.0 23rd 14.2 +0.7 7.3 4th 18.6 23.5 average 79%
South Mallee (district 77)
Hopetoun Airport 30.5   41.6 23rd 13.0   6.9 11th 28.6
Swan Hill Aerodrome 31.3 +1.2 41.1 23rd 14.2 +1.0 8.4 11th 8.6 20.6 average 42%
North Wimmera (district 78)
Nhill Aerodrome 28.8   40.2 23rd 12.3   6.6 4th 25.6
Warracknabeal Museum 29.3 +0.7 40.4 23rd 12.7 +0.6 7.6 18th 27.6 25.7 average 107%
South Wimmera (district 79)
Edenhope Airport 27.3   41.3 23rd 10.8   4.0 4th 27.2
Grampians (Mount William) 18.4   30.5 16th 8.1   2.2 18th 48.2
Horsham Aerodrome 28.9 +0.5 40.6 23rd 10.4 +0.1 5.0 4th 26.6 27.6 average 96%
Horsham Polkemmet Rd 29.5 +1.8 41.3 16th 10.3 -1.3 5.1 4th 32.6 27.7 average 118%
Kanagulk 28.2   41.2 23rd 10.1   4.4 9th 27.6
Longerenong 29.6 +2.0 41.5 16th 10.3 -0.9 4.0 9th 32.8 27.2 high 121%
Pyrenees (Ben Nevis) 21.7   33.6 16th 10.1   3.9 18th 24.6
Stawell Aerodrome 27.3 +1.0 38.9 16th 11.6 +0.6 6.3 9th 27.8 32.0 average 87%
Lower North (district 80)
Charlton 30.1   40.4 23rd 12.9   6.8 4th 30.2
Echuca Aerodrome 30.6 +1.7 40.5 23rd 13.5 +0.1 7.5 4th 11.0 28.7 average 38%
Kerang 31.1 +1.4 41.4 23rd 14.3 +0.9 8.2 11th 8.4 27.4 average 31%
Kyabram DPI 30.5 +2.6 40.2 23rd 13.2 +0.8 7.1 9th 9.2 31.9 low 29%
Upper North (district 81)
Bendigo Airport 28.7 +1.8 39.4 23rd 11.7 +0.2 4.9 9th 19.0 40.6 average 47%
Shepparton Airport 29.6 +0.9 40.2 23rd 12.3 0.0 6.9 9th 10.8 27.5 average 39%
Tatura Inst Sustainable Ag 29.3 +2.0 38.6 23rd 12.7 +0.5 5.2 9th 12.6 33.3 average 38%
Yarrawonga 31.7 +1.9 40.3 17th 13.6 +0.6 7.4 9th 8.8 33.5 low 26%
Lower Northeast (district 82)
Beechworth Woolshed 29.7 +2.2 37.3 17th 9.4 -1.1 4.1 9th 11.7 57.1 low 20%
Benalla Airport 30.4   39.1 23rd 11.9   5.1 9th 15.2
Corryong Airport 30.4   39.6 17th 10.7   4.6 12th 33.8
Dartmouth Reservoir 28.5 +1.8 36.2 17th 11.8 +0.3 5.7 12th 28.6 72.0 low 40%
Hunters Hill 24.2 +1.6 32.0 17th 13.1 +1.4 4.2 11th 41.2 73.3 average 56%
Rutherglen Research 30.8 +1.6 39.9 17th 11.1 -0.3 4.8 9th 16.0 43.4 low 37%
Strathbogie 25.7 +1.2 34.7 23rd 8.9 -0.4 2.6 9th 30.2 55.8 average 54%
Wangaratta Aero 31.0 +2.0 40.0 17th 11.3 -0.2 5.1 9th 12.6 39.0 average 32%
Upper Northeast (district 83)
Dinner Plain (Mount Hotham Airport) 20.3   27.9 17th 6.3   -0.8 2nd 62.6 55.8 average 112%
Falls Creek 16.4 +1.4 23.5 17th 7.1 +1.0 -1.5 11th 57.8 102.7 average 56%
Mount Buller 15.7 +1.2 22.8 30th 7.2 +1.1 -1.3 11th 114.2 88.3 average 129%
Mount Hotham 14.7 +1.1 21.9 30th 6.1 +0.6 -2.6 11th 66.4 95.8 average 69%
Omeo 25.4   35.0 17th 8.6   2.7 2nd 33.0
East Gippsland (district 84)
Combienbar AWS 24.8 +2.0 36.8 17th 11.7 +0.6 6.8 11th 61.8 72.5 average 85%
Gabo Island Lighthouse 21.7 +1.8 33.3 17th 15.5 +1.2 12.4 11th 23.4 66.9 low 35%
Gelantipy 22.6 +1.4 33.1 17th 9.7 +0.3 2.8 2nd 62.4 61.0 average 102%
Lakes Entrance (Eastern Beach Road) 23.1   36.5 16th 13.3   8.9 15th 42.6
Mallacoota 23.5 +1.7 41.6 17th 13.7 +0.4 9.4 15th 32.0 71.8 low 45%
Mount Nowa Nowa 23.9 +1.8 36.4 31st 12.6 +0.8 8.4 11th 60.4 81.9 low 74%
Orbost 24.9   39.7 17th 12.7   7.9 2nd 58.0 60.0 average 97%
Orbost (Comparison) 25.0 +1.5 39.4 17th 11.4 -0.4 4.1 9th 52.8 77.7 average 68%
Point Hicks (Lighthouse) 24.3 +2.5 36.2 24th 14.8 +0.7 11.0 15th 32.6 72.2 low 45%
West Gippsland (district 85)
Bairnsdale Airport 25.6 +2.2 38.6 31st 11.8 +0.7 7.1 15th 50.2 59.1 average 85%
East Sale Airport 24.9 +1.6 38.2 16th 11.2 -0.1 6.6 9th 37.6 54.0 average 70%
Morwell (Latrobe Valley Airport) 25.2 +1.2 37.4 31st 11.1 0.0 4.9 9th 56.2 68.1 average 83%
Mount Baw Baw 14.8 +0.6 24.8 16th 6.3 +0.8 -1.0 9th 100.4
Mount Moornapa 24.2 +1.6 36.8 16th 11.7 +0.6 7.1 9th 52.6 50.7 average 104%
Noojee (Slivar) 23.9 +1.4 35.5 23rd 10.3 +0.6 5.3 9th 65.2 94.2 average 69%
Pound Creek 22.6   36.2 31st 10.6   4.2 15th 45.4
Wilsons Promontory Lighthouse 20.9 +2.1 34.9 16th 14.0 +1.4 11.0 9th 60.2 63.4 average 95%
Yarram Airport 24.5   38.6 31st 10.8   4.6 15th 34.0
East Central (district 86)
Bundoora (Latrobe University) 25.6 +0.9 39.5 23rd 12.9 +0.7 7.9 9th 38.7 63.8 low 61%
Cerberus 23.0 +0.9 37.7 23rd 11.9 +0.1 6.1 15th 43.8 51.8 average 85%
Coldstream 25.7 +0.8 37.8 23rd 9.8 +0.5 4.4 2nd 53.2 47.9 average 111%
Coldstream Comparison 26.0   38.1 23rd 9.7   4.3 2nd 52.8
Cranbourne Botanic Gardens 24.2 +1.0 38.0 23rd 11.4 -0.3 8.0 1st 31.3 61.5 low 51%
Essendon Airport 25.3 +1.0 38.8 23rd 13.1 +1.5 7.7 9th 38.8 51.4 average 75%
Ferny Creek (Dunns Hill) 20.7 +0.8 32.5 23rd 10.4 +0.2 5.6 11th 70.8 84.0 average 84%
Frankston AWS 23.2 +1.0 37.3 23rd 14.2 +0.5 10.4 9th
Melbourne Airport 25.1 +0.7 38.6 23rd 12.7 +0.8 7.7 9th 35.8 48.4 average 74%
Melbourne Regional Office 25.9 +1.7 39.2 16th 14.7 +1.8 9.6 9th 55.0 59.1 average 93%
Moorabbin Airport 24.8 +1.0 39.2 23rd 13.0 +0.5 8.6 1st 34.4 58.7 low 59%
Rhyll 22.3 +0.8 33.3 30th 14.3 +0.9 9.8 11th 50.6 42.5 average 119%
Scoresby Research Institute 25.1 +1.3 37.9 23rd 11.7 -0.1 5.9 2nd 53.8 75.3 average 71%
Viewbank (ARPANSA) 25.9 +0.5 38.9 23rd 12.8 +0.5 7.3 9th 45.0 65.5 low 69%
Wallan (Kilmore Gap) 23.5 +2.0 35.4 23rd 10.7 +0.8 6.0 11th 36.2 43.6 average 83%
Wonthaggi 23.2 +1.4 37.0 16th 12.1 +0.6 8.1 15th 59.2 60.5 average 98%
West Central (district 87)
Avalon Airport 25.3 +1.4 40.9 16th 11.9 +0.3 6.9 9th 30.0 29.7 average 101%
Grovedale (Geelong Airport) 24.7 +2.1 40.4 16th 10.7 -0.3 5.8 9th 32.6 40.6 average 80%
Laverton RAAF 24.9 +1.2 40.0 23rd 12.8 +0.9 7.6 9th 32.4 45.7 average 71%
Sheoaks 25.4 +2.3 38.6 16th 10.4 +0.2 4.0 4th 28.0 32.8 average 85%
North Central (district 88)
Castlemaine Prison 26.5 +1.2 37.2 23rd 10.9 +0.2 3.4 5th 35.2 41.2 average 85%
Eildon Fire Tower 25.3 +1.8 35.2 23rd 11.6 +0.6 5.8 11th 27.8 36.1 average 77%
Lake Eildon 28.2 +2.0 36.9 30th 11.3 +0.4 5.1 9th 29.2 55.7 low 52%
Mangalore Airport 29.3 +2.4 39.3 23rd 12.6 +0.8 7.0 9th 20.6 40.4 low 51%
Maryborough 27.5 +0.9 38.5 23rd 11.5 +0.2 5.8 9th 33.9 37.6 average 90%
Redesdale 27.9 +1.7 38.4 23rd 10.2 +0.3 3.7 9th 22.2 37.7 average 59%
Western Plains (district 89)
Ararat Prison 26.1 +1.7 38.1 23rd 9.5 +0.3 4.0 9th 35.8 36.6 average 98%
Ballarat Aerodrome 24.0 +1.5 35.5 23rd 9.7 +0.3 2.5 9th 32.0 51.3 average 62%
Westmere 26.5   41.0 16th 8.9   2.4 15th 37.2
West Coast (district 90)
Aireys Inlet 22.4 +1.6 39.2 16th 12.4 +0.3 8.2 9th 48.4 40.3 high 120%
Cape Nelson Lighthouse 21.0 +1.6 40.1 31st 13.4 +0.5 9.3 26th 43.0 40.8 average 105%
Cape Otway Lighthouse 20.8 +0.9 37.6 16th 13.0 +1.0 9.2 21st 40.2 52.9 average 76%
Casterton 25.4   39.2 16th 9.9   3.5 4th 40.8
Casterton Showgrounds 26.4 +2.1 39.2 30th 10.0 -0.4 4.8 4th 39.2 41.1 average 95%
Colac (Mount Gellibrand) 24.0   39.1 16th 10.6   5.6 9th 51.8 39.8 high 130%
Dartmoor 25.1   40.7 31st 10.7   5.7 26th 40.2
Hamilton Airport 25.5 +1.7 39.6 16th 9.5 +0.1 4.3 14th 39.6 44.1 average 90%
Mortlake Racecourse 24.5 +1.5 39.8 16th 9.5 +0.4 3.4 4th 46.2 41.8 average 111%
Port Fairy AWS 22.7 +1.7 40.5 31st 12.5 +0.2 7.6 9th 42.0 40.7 average 103%
Portland (Cashmore Airport) 21.3 +1.3 37.8 31st 10.9 +0.1 4.6 26th 42.8 49.5 average 86%
Warrnambool Airport NDB 23.3 +0.8 40.0 16th 9.9 0.0 3.9 26th 46.4 46.3 average 100%
Weeaproinah 19.4 +1.6 33.8 16th 9.6 +0.3 6.1 9th 113.8 113.2 average 101%

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Victoria 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 Tuesday 5 January 2010. 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