Thursday, 3 January 2008 - Monthly Climate Summary for Victoria - Product code IDCKGC16R0

Victoria in December 2007
A warm and generally wet month

Summary

December was a generally warm month in Victoria, both by day and night, and also saw above-normal rainfall over much of the state. Maximum temperatures averaged 1.70°C above normal over the state (9th highest on record), whilst minimum temperatures averaged 1.23°C above normal (8th highest on record). Statewide average rainfall was 33% above normal (22nd highest on record), the second successive wet month after a dry winter and early spring.

Details

Rainfall

Rainfall was above normal in most parts of the state, with the bulk of the rain falling in association with a low-pressure system which approached and then crossed the state between 19 and 23 December. Most areas north of the Divide, except for the northern Mallee, had rainfall 50% to 100% above normal, with some areas between Bendigo and Kerang receiving more than double their December average. Other areas which were more than 50% above normal included the Grampians, and Melbourne’s southern and eastern suburbs. In contrast, most of Gippsland was slightly drier than normal, as were parts of the northern Mallee and the south-west coast west of Port Fairy, but only a few areas were more than 20% below normal.

The highest monthly total was 219.2 mm at Mount Hotham, and the highest daily total was 125.0 mm on 22 December at Stump Hill, north-west of Mansfield. The lowest monthly total was 17.1 mm at Werrimull.

Some sites had their highest total December rainfall for at least 20 years.

There is a map of total rainfall below. There is a map of rainfall deciles below.

Temperature

Maximum temperature

Maximum temperatures were above average throughout the state. The month was consistently warm (except during the 19−23 December rain event), although without major extremes, until the last few days, when a major heatwave affected most of the state. Monthly averages were 2 to 3°C above normal over most of southern Victoria from West Gippsland westwards, as well as in the Wimmera, whilst they were 1 to 2°C above normal in most of northern Victoria. In most of Gippsland and the far northeast they were less than 1°C above normal.

The hottest day was 44.6°C at Hopetoun Airport on the 31st.

The warmest days on average were 31.8°C at Mildura Airport.

The coolest days on average were 13.7°C at Mt Hotham.

The coldest day was 4.1°C at Mt Baw Baw on the 23rd.

Some sites had their highest December temperature on record.

Some sites had their highest December mean daily maximum temperature on record.

There is a map of mean maximum temperatures below. There is a map of maximum temperature anomalies below.

Minimum temperature

Minimum temperatures were also above normal statewide, with a marked lack of cold nights. They were between 1 and 2°C above normal over most of northern Victoria (locally more than 2°C along the Murray east of Albury-Wodonga), as well as around Melbourne and in most of Gippsland. They were between normal and 1°C above normal in south-western Victoria and the Wimmera.

The coldest night was −2.1°C at Mt Hotham on the 23rd and 25th.

The coolest nights on average were 6.2°C at Mt Hotham.

The warmest nights on average were 16.3°C at Mildura Airport.

The warmest night was 25.4°C at Ben Nevis on the 31st.

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

Some sites had their highest December mean daily minimum temperature for at least 20 years.

There is a map of mean minimum temperatures below. There is a map of minimum temperature anomalies below.

Wind

The strongest wind gusts in Victoria during December occurred in association with the low pressure system of 19−23 December. 135 km/h was observed at Wilsons Promontory on 22 December, and a number of other stations (mostly elevated) exceeded 100 km/h between 21 and 23 December.

Further information

Dr Harvey Stern
Climate Meteorologist
Victoria Climate Services Centre
Bureau of Meteorology
Phone (03) 9669 4956
Email climate.vic@bom.gov.au

Extremes

Hottest day
Highest temperature
44.6°C at Hopetoun Airport on the 31st
Warmest days on average
Highest mean daily maximum temperature
31.8°C at Mildura Airport
Coolest days on average
Lowest mean daily maximum temperature
13.7°C at Mt Hotham
Coldest day
Lowest daily maximum temperature
4.1°C at Mt Baw Baw on the 23rd
Coldest night
Lowest temperature
−2.1°C at Mt Hotham on the 23rd
−2.1°C at Mt Hotham on the 25th
Coolest nights on average
Lowest mean daily minimum temperature
6.2°C at Mt Hotham
Warmest nights on average
Highest mean daily minimum temperature
16.3°C at Mildura Airport
Warmest night
Highest daily minimum temperature
25.4°C at Pyrenees (Ben Nevis) on the 31st
Wettest overall
Highest total rainfall
219.2 mm at Mt Hotham
Driest overall
Lowest total rainfall
17.1 mm at Werrimull
Wettest day
Highest daily rainfall
84.0 mm at Mt Hotham on the 22nd
Highest wind gust
135 km/h at Wilsons Promontory Lighthouse on the 22nd

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


Records

Highest total December rainfall for at least 20 years
Total rainfall
for December 2007 (mm)
Most recent higher
for December
Years since
higher
Normal for
December
Moorabbin Airport 127.2 146.6 in 1954 50 57.8



Record highest December temperature
Highest temperature
in December 2007 (°C)
Previous highest
for December
Years of
record
Normal for
December
Heywood Forestry 42.5 on the 31st 42.1 on the 10th in 2006 39 22.5
Weeaproinah 36.5 on the 31st 35.5 on the 11th in 1998 27
Portland (Cashmore Airport) 40.9 on the 31st 39.9 on the 9th in 2006 26



Record highest December mean daily maximum temperature
Mean daily maximum
temperature
for December 2007 (°C)
Previous highest
for December
Years of
record
Normal for
December
Heywood Forestry 25.5 24.9 in 1980 45 22.5
Wonthaggi 24.8 24.4 in 2003 38 21.7



Record highest December mean daily minimum temperature
Mean daily minimum
temperature
for December 2007 (°C)
Previous highest
for December
Years of
record
Normal for
December
Wilsons Promontory Lighthouse 14.7 14.4 in 2003 129 12.8
Walpeup Research 15.6 = 15.6 in 1965 58 13.5
Mangalore Airport 14.5 14.3 in 1975 47 11.7
Kyabram DPI 14.9 14.6 in 1992 41 12.1
Bundoora (Latrobe University) 14.3 13.8 in 1992 24

Highest December mean daily minimum temperature for at least 20 years
Mean daily minimum
temperature
for December 2007 (°C)
Most recent higher
for December
Years since
higher
Normal for
December
Echuca Aerodrome 14.8 15.2 in 1965 42 13.1
Walpeup Research 15.6 15.6 in 1965 39 13.5
Moorabbin Airport 14.2 14.3 in 1975 32 12.7
Gabo Island Lighthouse 15.3 15.7 in 1980 27 14.7



Summaries

In this table, key sites have been highlighted to make them easier to find. This table is very wide and may not fit if printed.

Summary statistics for December 2007
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2007
Diff
from
normal
Highest for
December
2007
Mean for
December
2007
Diff
from
normal
Lowest for
December
2007
Total for
December
2007
Normal
for
December
Rank of
December
2007
Fraction of
December
normal
North Mallee (district 76)
Mildura Airport 31.8 +1.7 42.8 31st 16.3 +1.4 9.2 23rd 18.8 22.3 normal 84%
Ouyen 31.4 +1.3 43.3 30th 15.2 +1.4 8.3 23rd 39.6 24.6 high 161%
Walpeup Research 31.2 +1.3 42.9 31st 15.6 +2.1 6.6 10th   23.9 low 20%
South Mallee (district 77)
Hopetoun Airport 31.2 44.6 31st 13.9 5.5 10th 28.6
Swan Hill Aerodrome 29.9 41.5 31st 15.1 8.8 23rd 41.0
North Wimmera (district 78)
Nhill 28.9 +1.4 43.0 31st 11.6 +0.2 4.8 10th 51.0 26.2 high 195%
Nhill Aerodrome 29.5 43.7 31st 12.5 6.0 8th 41.6
Warracknabeal Museum 30.0 +1.4 42.5 31st 13.7 +1.6 7.4 23rd 35.8 23.6 high 152%
South Wimmera (district 79)
Edenhope Airport 28.1 43.6 31st 11.3 5.0 25th 35.4
Grampians 18.7 32.7 31st 8.3 1.4 10th 99.4
Horsham Aerodrome 29.6 44.0 31st 11.2 4.0 25th 27.0
Horsham Polkemmet Rd 29.6 +2.3 43.7 31st 11.5 −0.2 5.0 25th 40.6 23.0 very high 177%
Kanagulk 28.5 42.7 31st 11.3 5.0 25th 58.0
Longerenong 29.9 +2.7 44.3 31st 11.4 +0.2 3.6 25th 22.4 23.8 normal 94%
Stawell Aerodrome 27.5 41.7 31st 11.8 4.8 10th 37.8
Lower North (district 80)
Charlton 29.9 42.1 31st 14.6 7.7 25th 43.6
Echuca Aerodrome 30.2 +1.7 42.1 30th 14.8 +1.7 8.1 25th 46.8 29.1 high 161%
Kerang 30.8 +1.5 42.3 30th 15.4 +1.8 8.3 10th 53.2 27.7 high 192%
Kyabram DPI 29.5 +1.6 41.2 30th 14.9 +2.8 8.2 23rd 63.6 31.5 high 202%
Upper North (district 81)
Bendigo Airport 28.2 39.9 30th 13.4 6.6 25th 72.8
Shepparton Airport 29.5 41.1 30th 14.6 8.5 10th 60.0
Tatura Inst Sustainable Ag 28.9 +1.6 39.4 30th 14.2 +2.1 8.1 11th 60.0 36.1 high 166%
Yarrawonga 30.0 40.7 30th 15.6 8.4 25th 56.6
Lower Northeast (district 82)
Beechworth Woolshed 28.4 39.0 30th 12.5 4.8 25th 53.4
Benalla Airport 28.9 39.5 30th 14.3 9.1 23rd 102.8
Corryong Airport 28.8 37.1 30th 12.6 7.3 11th 117.6
Dartmouth Reservoir 27.5 37.2 30th 13.3 8.8 23rd 101.4
Hunters Hill 22.7 32.8 30th 12.8 5.6 25th 152.2
Rutherglen Research 29.9 +0.8 40.1 30th 13.5 +2.4 6.4 25th 53.4 46.0 high 116%
Strathbogie 25.1 36.4 30th 11.3 5.9 11th 93.8 65.7 high 143%
Wangaratta Aero 29.8 39.9 30th 13.3 7.5 11th 74.4
Upper Northeast (district 83)
Dinner Plain 19.5 29.1 31st 7.2 −0.8 25th 74.0
Falls Creek 15.1 25.0 30th 7.2 −1.1 25th 195.2
Mount Buller 14.4 25.0 30th 7.3 −1.9 23rd 141.2
Mt Hotham 13.7 22.7 30th 6.2 −2.1 23rd 219.2
Omeo 23.9 35.6 31st 10.0 2.8 25th 68.8
Omeo Comparison 24.1 +0.8 35.3 31st 9.6 +1.6 3.6 25th 62.8 65.6 normal 96%
East Gippsland (district 84)
Combienbar AWS 24.2 36.6 31st 12.3 6.0 25th
Gabo Island Lighthouse 21.0 +1.3 25.5 29th 15.3 +0.7 11.4 12th 48.6 82.1 normal 59%
Gelantipy 22.1 35.0 31st 10.5 4.2 25th 50.4
Lakes Entrance 22.7 38.0 29th 13.3 8.0 11th 78.6
Mallacoota 23.2 32.2 29th 14.2 8.6 12th 52.6
Mt Nowa Nowa 23.3 37.9 29th 13.3 7.9 25th 100.4
Orbost 24.4 38.2 29th 13.5 7.5 26th 88.2
Orbost 24.8 +1.1 38.4 29th 12.7 +0.6 6.3 26th 87.4 87.0 normal 100%
Point Hicks 23.1 +1.6 33.2 29th 52.8 74.8 normal 71%
West Gippsland (district 85)
Bairnsdale Airport 24.0 37.9 29th 12.2 6.1 11th 72.4
East Sale Airport 24.0 +0.7 38.1 29th 12.6 +1.1 5.9 11th 53.0 57.7 normal 92%
Morwell 25.0 38.5 31st 12.3 4.1 11th 73.2
Mt Baw Baw 14.9 27.5 31st 7.0 −0.7 10th 151.6
Mt Moornapa 23.3 36.2 29th 12.3 7.1 25th 50.6
Noojee 24.6 37.2 31st 11.0 3.9 11th 131.0
Pound Creek 24.2 38.6 31st 11.8 6.3 12th 80.8
Wilsons Promontory Lighthouse 20.5 +1.9 34.8 31st 14.7 +1.9 11.3 23rd 65.8 63.1 normal 104%
Yarram Airport 24.0 39.1 29th 12.2 4.4 11th 46.8
East Central (district 86)
Bundoora 26.3 40.5 31st 14.3 8.6 26th 79.4
Cerberus 24.9 39.7 31st 13.0 6.4 11th 83.4
Coldstream 26.8 38.6 31st 11.5 4.5 10th 105.0
Cranbourne Botanic Gardens 25.4 38.9 31st 12.7 7.5 26th 78.5
Essendon Airport 26.7 41.2 31st 13.9 8.3 26th 69.2 49.9 high 139%
Ferny Creek 21.7 34.9 31st 11.5 6.4 23rd 203.0
Frankston AWS 24.8 38.8 31st 15.0 11.0 26th
Melbourne Airport 26.3 +1.8 40.2 31st 13.7 +1.9 7.1 10th 83.6 47.8 high 175%
Melbourne Regional Office 26.8 +2.7 41.1 31st 15.8 +2.1 10.2 23rd 71.4 58.1 high 123%
Moorabbin Airport 26.2 +2.3 39.9 31st 14.2 +1.6 8.7 26th 127.2 57.8 highest 220%
Phillip Island Penguin Reserve 23.4 33.8 29th 12.6 6.4 8th 59.9
Rhyll 24.1 35.7 31st 15.2 11.1 10th 65.0
Scoresby Research Institute 26.0 +2.3 38.4 31st 13.2 +1.1 5.7 25th 156.4 70.0 highest 223%
Viewbank 27.1 40.4 31st 14.1 7.8 26th 86.2
Wallan 24.0 35.5 29th 11.7 5.5 10th 119.0
Wonthaggi 24.8 +3.1 39.4 31st 12.5 +1.2 7.0 26th 69.6 60.6 normal 115%
West Central (district 87)
Avalon Airport 26.1 43.2 31st 12.9 7.0 11th 48.2
Geelong Airport 25.1 43.1 31st 11.7 5.8 11th 54.4
Laverton RAAF 26.2 +2.3 41.1 31st 13.7 +1.7 7.2 10th 69.8 49.4 high 141%
Point Wilson 23.1 40.3 31st 15.0 10.6 23rd
Sheoaks 25.7 41.2 31st 11.1 4.4 26th 45.6
North Central (district 88)
Castlemaine Prison 26.6 +1.0 39.1 31st 12.6 +1.9 3.5 10th 59.9 41.8 high 143%
Eildon Fire Tower 24.9 36.3 30th 12.8 5.5 25th 22.4
Lake Eildon 27.7 +1.7 38.3 31st 13.1 +2.2 6.0 25th 62.4 60.5 normal 103%
Mangalore Airport 29.0 +2.4 39.7 31st 14.5 +2.8 7.5 23rd 62.6 43.9 high 143%
Maryborough 28.0 +1.9 41.0 31st 12.4 +1.0 5.5 25th 104.0 37.7 highest 276%
Redesdale 28.0 39.8 30th 11.9 3.6 10th 103.6 42.5 very high 244%
Western Plains (district 89)
Ararat Prison 26.6 +2.4 41.0 31st 10.8 +1.6 3.8 10th 43.0 33.8 high 127%
Ballarat Aerodrome 24.9 +2.5 38.2 31st 10.2 +0.6 3.1 11th 65.0 46.6 high 139%
Westmere 26.9 42.4 31st 9.5 3.8 11th 78.2
West Coast (district 90)
Aireys Inlet 23.3 42.1 31st 12.7 8.3 23rd 73.2
Cape Nelson Lighthouse 22.2 41.8 31st 13.5 8.2 8th 28.6
Cape Otway Lighthouse 21.3 +2.2 39.6 31st 13.3 +1.2 8.7 10th 71.4 57.3 normal 125%
Casterton 26.3 42.2 31st 10.4 3.8 25th 36.2
Casterton Showgrounds 26.7 +2.5 41.8 31st 10.8 +0.3 4.3 25th 36.6 41.5 normal 88%
Colac 24.9 41.3 31st 11.4 6.1 10th 82.2
Hamilton Airport 26.2 41.6 31st 9.9 3.8 10th 54.2
Heywood Forestry 25.5 +3.0 42.5 31st 10.4 +0.1 5.0 8th 31.4 52.4 normal 60%
Mortlake Racecourse 25.3 40.9 31st 10.0 3.3 10th 74.8
Port Fairy AWS 24.0 42.3 31st 13.0 6.8 26th 59.6
Portland 21.9 40.9 31st 10.8 4.3 26th 36.8
Warrnambool Airport Ndb 24.4 40.8 31st 10.3 4.4 26th 58.0
Weeaproinah 20.5 36.5 31st 10.2 5.3 25th 160.8 118.1 high 136%

Notes

This statement has been prepared based on information available at 11 am on Wednesday 2 January 2008. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Normals are long-term means based on observations from the years 1961 to 1990. They are not shown for sites with less than 20 years of record in that time, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of "normal" 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, normal in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of normal shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

Dr Harvey Stern
Climate Meteorologist
Victoria Climate Services Centre
Bureau of Meteorology
Phone (03) 9669 4956
Email climate.vic@bom.gov.au