Thursday, 3 January 2008 - Monthly Climate Summary for Victoria - Product code IDCKGC16R0
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.
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.
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 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.
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.
|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|
Lowest daily maximum temperature
|4.1°C at Mt Baw Baw on the 23rd|
−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|
Highest daily minimum temperature
|25.4°C at Pyrenees (Ben Nevis) on the 31st|
Highest total rainfall
|219.2 mm at Mt Hotham|
Lowest total rainfall
|17.1 mm at Werrimull|
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|
|Highest total December rainfall for at least 20 years|
for December 2007 (mm)
Most recent higher
|Moorabbin Airport||127.2||146.6||in 1954||50||57.8|
|Record highest December temperature|
in December 2007 (°C)
|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
for December 2007 (°C)
|Heywood Forestry||25.5||24.9||in 1980||45||22.5|
|Record highest December mean daily minimum temperature|
Mean daily minimum
for December 2007 (°C)
|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
for December 2007 (°C)
Most recent higher
|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|
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|
|North Mallee (district 76)|
|South Mallee (district 77)|
|Swan Hill Aerodrome||29.9||41.5||31st||15.1||8.8||23rd||41.0|
|North Wimmera (district 78)|
|South Wimmera (district 79)|
|Horsham Polkemmet Rd||29.6||+2.3||43.7||31st||11.5||−0.2||5.0||25th||40.6||23.0||very high||177%|
|Lower North (district 80)|
|Upper North (district 81)|
|Tatura Inst Sustainable Ag||28.9||+1.6||39.4||30th||14.2||+2.1||8.1||11th||60.0||36.1||high||166%|
|Lower Northeast (district 82)|
|Upper Northeast (district 83)|
|East Gippsland (district 84)|
|Gabo Island Lighthouse||21.0||+1.3||25.5||29th||15.3||+0.7||11.4||12th||48.6||82.1||normal||59%|
|Mt Nowa Nowa||23.3||37.9||29th||13.3||7.9||25th||100.4|
|West Gippsland (district 85)|
|East Sale Airport||24.0||+0.7||38.1||29th||12.6||+1.1||5.9||11th||53.0||57.7||normal||92%|
|Mt Baw Baw||14.9||27.5||31st||7.0||−0.7||10th||151.6|
|Wilsons Promontory Lighthouse||20.5||+1.9||34.8||31st||14.7||+1.9||11.3||23rd||65.8||63.1||normal||104%|
|East Central (district 86)|
|Cranbourne Botanic Gardens||25.4||38.9||31st||12.7||7.5||26th||78.5|
|Melbourne Regional Office||26.8||+2.7||41.1||31st||15.8||+2.1||10.2||23rd||71.4||58.1||high||123%|
|Phillip Island Penguin Reserve||23.4||33.8||29th||12.6||6.4||8th||59.9|
|Scoresby Research Institute||26.0||+2.3||38.4||31st||13.2||+1.1||5.7||25th||156.4||70.0||highest||223%|
|West Central (district 87)|
|North Central (district 88)|
|Eildon Fire Tower||24.9||36.3||30th||12.8||5.5||25th||22.4|
|Western Plains (district 89)|
|West Coast (district 90)|
|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%|
|Port Fairy AWS||24.0||42.3||31st||13.0||6.8||26th||59.6|
|Warrnambool Airport Ndb||24.4||40.8||31st||10.3||4.4||26th||58.0|
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
(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.