Victoria in January 2010:

Warm days. Generally drier than normal.

Overall, across the State of Victoria, overnight minimum temperatures were near to those usually experienced. Daytime maximum temperatures at most localities were much warmer than those registered in the past. Total rainfall for the month was generally slightly less than that usually recorded.

Rainfall

Overall, across the State of Victoria, total rainfall for the month was generally slightly less than that usually recorded.

Specifically over the southern districts, the average percentage of normal received during the past month was 73%, whilst over the northern plains, the average percentage of normal received during the past month was 62%.

In Melbourne city, total rainfall for the month was 22.6 mm, this being much less than that usually recorded (normal 47.4 mm, percentage of normal received during the past month 48%).

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

Temperature

Overall, across the State of Victoria, overnight minimum temperatures were near to those usually experienced., whilst daytime maximum temperatures at most localities were much warmer than those registered in the past.

Specifically over the southern districts, overnight minimum temperatures were near to those usually experienced (average departure from normal 0.1C), whilst daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.4C). Over the northern plains, overnight minimum temperatures were near to those usually experienced (average departure from normal 0C), whilst daytime maximum temperatures at most localities were much warmer than those registered in the past (average departure from normal 2C). .

In Melbourne city, under the influence of the heat island effect (cities are usually warmer than their rural surroundings, especially at night, because of heat stored in bricks and concrete and trapped between close-packed buildings), overnight minimum temperatures were much warmer than those usually experienced and averaged 15.9C (departure from normal 1.6C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 27.5C (departure from normal 1.6C).

Some 20 kilometres northwest of the city centre, Melbourne Airport, is more typical of the Melbourne metropolitan area. This is because, being located in a somewhat rural setting, it is away from most of the influence of the heat island effect. Here, overnight minimum temperatures were near to those usually experienced and averaged 13.9C (departure from normal 0.3C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 27C (departure from normal 0.8C).

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

Some sites had their lowest January temperature on record. Some sites had their highest January daily minimum temperature on record. Melbourne's overnight (11th/12th) minimum temperature of 30.6C equalled the all-time "warmest night" record (for any month), which was set during the night of 31 January/1 February 1902.

There is a map of mean maximum temperatures below.

There is a map of maximum temperature anomalies below.

There is a map of mean minimum temperatures below.

There is a map of minimum temperature anomalies below.

Discussion of synoptic patterns

The Mean Sea Level Pressure (MSLP) pattern for the month was typical of January, showing a ridge of high pressure extending from waters to the south of the Bight towards Victoria, and thereby directing a mostly S to SE airflow across the State. This flow was stronger than usual, MSLP being below normal over the west Tasman Sea, and above normal to the south of the Bight. Notwithstanding this anomalous southerly flow, which one might have expected to result in lower than usual temperatures, the average temperature of the air in the lower atmosphere over Victoria was above normal (hence the warmer than usual weather). Conversely, the average relative humidity of the air in the lower atmosphere over Victoria was below normal (hence the drier than usual weather).

Further information

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Extremes in January 2010
Hottest day 45.7 C at Avalon Airport on the 11th
Warmest days on average 34.7 C at Mildura Airport
Coolest days on average 17.0 C at Mount Baw Baw
Coldest day 2.7 C at Mount Baw Baw on the 18th
Coldest night -3.5 C at Mount Hotham on the 17th/18th
Coolest nights on average 7.9 C at Mount Baw Baw
Warmest nights on average 17.1 C at Albury Airport AWS
17.1 C at Gabo Island Lighthouse
Warmest night 30.6 C at Melbourne on the 11th/12th
Wettest overall 210.6 mm at Falls Creek (Rocky Valley)
Highest wind gust 133 km/h at Eildon Fire Tower on the 1st

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 January temperature
Highest temperature
in January 2010 (C)
Previous highest
for January
Years of
record
Average for
January
Port Fairy AWS 44.3 on the 11th 42.9 on the 22nd in 2006 19 22.3
Cape Nelson Lighthouse 42.4 on the 11th 41.2 on the 22nd in 2006 15 20.9
Warrnambool Airport NDB 44.0 on the 11th 43.7 on the 29th in 2009 12 24.2



Record lowest January daily maximum temperature
Lowest daily maximum
temperature
in January 2010 (C)
Previous lowest
for January
Years of
record
Average for
January
Point Hicks (Lighthouse) 15.5 on the 18th 16.2 on the 13th in 1983 40 23.7
Mount Baw Baw 2.7 on the 18th 3.0 on the 6th in 2005 12 17.8



Record highest January daily minimum temperature
Highest daily minimum
temperature
in January 2010 (C)
Previous highest
for January
Years of
record
Average for
January
Maryborough 28.9 on the 12th 26.4 on the 21st in 1997 46 12.8
Tatura Inst Sustainable Ag 26.6 on the 12th 26.0 on the 12th in 1982 46 14.0
Castlemaine Prison 28.5 on the 12th = 28.5 on the 29th in 2009 39 12.9
Mount Buller 20.2 on the 12th 20.0 on the 30th in 2009 23 8.6
Bendigo Airport 27.3 on the 12th 26.6 on the 21st in 1997 19 13.9
Yarrawonga 29.3 on the 12th 28.0 on the 24th in 2001 17 15.7
Coldstream 24.4 on the 12th 24.2 on the 21st in 1997 16 11.6
Shepparton Airport 29.1 on the 12th 27.8 on the 17th in 2007 14 15.0
Stawell Aerodrome 26.9 on the 12th 26.0 on the 21st in 1997 14 13.4



Record lowest January temperature
Lowest temperature
in January 2010 (C)
Previous lowest
for January
Years of
record
Average for
January
Ferny Creek (Dunns Hill) 4.7 on the 18th 4.8 on the 18th in 2004 19 12.1
Mount Moornapa 5.6 on the 18th 5.8 on the 3rd in 2009 17 13.2
Combienbar AWS 4.5 on the 18th 5.5 on the 2nd in 2009 16 13.4
Mount Nowa Nowa 6.4 on the 18th 6.5 on the 7th in 2000 15 14.1
Eildon Fire Tower 4.0 on the 18th 4.6 on the 2nd in 2009 14 13.4
Mount Baw Baw -2.0 on the 18th -1.6 on the 2nd in 2009 12 8.8



Summary statistics for January 2010
Maximum temperatures
for January
(C)
Minimum temperatures
for January
(C)
Rainfall
for January
(millimetres)
Mean for
January
2010
Diff
from
average
Highest for
January
2010
Mean for
January
2010
Diff
from
average
Lowest for
January
2010
Total for
January
2010
Average
for
January
Rank of
January
2010
Fraction of
January
average
Southwest Slopes (South) (district 72)
Albury Airport AWS 34.4 +2.5 42.4 12th 17.1 +0.8 8.7 19th 21.0 36.2 average 58%
North Mallee (district 76)
Mildura Airport 34.7 +2.5 44.2 10th 16.9 +0.3 9.9 19th 8.8 20.5 average 43%
Ouyen (Post Office) 34.2 +1.9 45.4 10th 16.2 +0.8 9.9 19th 8.2 20.3 average 40%
Walpeup Research 34.1 +2.4 45.0 10th 15.6 +0.4 7.7 19th 13.6 21.2 average 64%
South Mallee (district 77)
Hopetoun Airport 33.4   44.6 10th 13.9   6.9 19th 23.2
Swan Hill Aerodrome 34.2 +1.3 44.5 10th 15.3 -0.6 9.0 19th 38.4 23.4 high 164%
North Wimmera (district 78)
Nhill Aerodrome 32.0   43.6 11th 12.7   7.1 19th 6.6
Warracknabeal Museum 32.3 +1.6 44.2 11th 13.3 -0.7 7.2 19th 6.4 24.2 low 26%
South Wimmera (district 79)
Edenhope Airport 29.6   43.3 11th 11.6   5.2 24th 21.4
Grampians (Mount William) 21.2   35.3 11th 9.6   1.8 18th 23.2
Horsham Aerodrome 31.6 +0.6 44.1 11th 11.4 -1.0 4.6 30th 15.4 22.4 average 69%
Horsham Polkemmet Rd 31.6 +1.8 44.6 11th 11.2 -1.9 5.1 19th 8.2 23.0 average 36%
Kanagulk 30.3   43.3 11th 11.2   6.1 7th 17.2
Longerenong 32.0 +2.1 44.6 11th 11.6 -1.3 4.9 19th 16.2 23.9 average 68%
Pyrenees (Ben Nevis) 24.8   38.0 11th 11.8   3.4 18th 32.2
Stawell Aerodrome 30.1 +0.9 42.7 11th 12.7 -0.7 6.2 19th 18.6 31.1 low 60%
Lower North (district 80)
Charlton 32.9   44.2 11th 13.8   6.9 19th 16.4
Echuca Aerodrome 33.2 +2.3 43.6 11th 14.6 -0.5 8.8 19th 31.0 27.3 average 114%
Kerang 33.6 +2.1 44.6 11th 15.2 +0.1 8.9 19th 37.6 22.8 high 165%
Kyabram DPI 33.1 +3.1 43.8 11th 14.5 +0.2 7.1 19th 37.6 31.9 average 118%
Upper North (district 81)
Bendigo Airport 31.5 +2.0 43.0 11th 13.6 -0.3 7.5 4th 13.6 29.6 low 46%
Shepparton Airport 32.9 +1.0 43.0 11th 14.5 -0.5 8.7 19th 7.0 20.2 low 35%
Tatura Inst Sustainable Ag 31.9 +2.4 42.1 11th 14.3 +0.3 7.6 19th 20.4 32.4 average 63%
Yarrawonga 34.3 +1.9 43.9 12th 15.7 0.0 8.5 19th 32.4 28.0 high 116%
Lower Northeast (district 82)
Beechworth Woolshed 33.1 +2.4 41.2 12th 13.2 -0.2 3.3 19th 41.8 45.0 average 93%
Benalla Airport 33.3   42.7 11th 14.2   6.9 19th 20.0
Corryong Airport 33.5   41.2 12th 13.9   4.2 19th 41.8
Dartmouth Reservoir 31.2 +2.1 38.4 11th 14.3 +0.7 5.5 19th 103.6 61.1 high 170%
Hunters Hill 27.5 +1.9 34.7 11th 15.4 +1.3 4.0 18th 50.2 57.8 average 87%
Rutherglen Research 33.8 +2.5 42.6 12th 14.1 +0.4 5.1 19th 33.8 36.0 average 94%
Strathbogie 28.8 +1.6 39.1 11th 11.0 -0.5 5.4 19th 50.0 46.7 average 107%
Wangaratta Aero 34.1 +2.3 43.4 12th 13.8 -0.3 7.1 20th 22.6 39.6 average 57%
Upper Northeast (district 83)
Dinner Plain (Mount Hotham Airport) 23.1   30.3 12th 8.6   0.9 18th 69.6 49.0 high 142%
Edi Upper 31.6 +1.7 39.2 12th 14.2 +0.3 6.6 19th 95.2 57.4 high 166%
Falls Creek 18.9 +1.4 25.8 11th 9.5 +1.0 -2.5 18th 194.8 105.9 high 184%
Mount Buller 18.5 +1.4 26.5 11th 9.8 +1.2 -2.7 18th 91.4 68.5 high 133%
Mount Hotham 17.4 +1.3 24.3 12th 8.6 +0.9 -3.5 18th 121.6 95.2 average 128%
Omeo 27.5   37.9 11th 11.2   4.1 18th 51.6
East Gippsland (district 84)
Combienbar AWS 26.7 +1.5 38.6 12th 13.0 -0.4 4.5 18th 59.6 74.5 average 80%
Gabo Island Lighthouse 22.8 +1.6 32.1 9th 17.1 +1.4 11.8 18th 15.2 70.6 low 22%
Gelantipy 24.8 +1.0 36.0 11th 11.7 +0.2 3.1 18th 80.0 64.1 high 125%
Lakes Entrance (Eastern Beach Road) 24.8   40.6 12th 14.9   10.0 18th 56.0
Mallacoota 25.0 +1.0 38.6 9th 16.0 +0.6 10.8 18th 15.2 63.7 low 24%
Mount Nowa Nowa 25.5 +0.8 39.3 9th 13.8 -0.3 6.4 18th 55.8 59.6 average 94%
Orbost 27.0   41.4 12th 14.4   8.9 18th 52.0 40.0 high 130%
Orbost (Comparison) 27.0 +1.6 40.6 12th 13.9 +0.7 8.8 30th 50.0 66.7 average 75%
Point Hicks (Lighthouse) 25.4 +1.7 40.2 12th 16.0 +0.3 8.8 20th 44.1 62.4 average 71%
West Gippsland (district 85)
Bairnsdale Airport 27.4 +1.7 41.1 12th 13.6 +0.9 8.2 18th 33.2 49.9 low 67%
East Sale Airport 27.4 +2.0 39.2 9th 13.4 +0.6 7.4 4th 33.2 45.5 average 73%
Morwell (Latrobe Valley Airport) 29.0 +2.8 40.1 9th 12.6 +0.1 5.2 4th 26.0 49.3 low 53%
Mount Baw Baw 17.0 -0.8 29.0 11th 7.9 -0.9 -2.0 18th 128.8 96.0 high 134%
Mount Moornapa 27.0 +1.8 38.1 9th 12.8 -0.4 5.6 18th 46.4 61.7 average 75%
Noojee (Slivar) 26.7 +1.7 40.6 11th 11.2 0.0 5.0 24th 71.6 67.7 average 106%
Pound Creek 24.9   38.0 31st 11.7   2.4 24th 35.8
Wilsons Promontory Lighthouse 21.8 +1.6 36.1 11th 14.9 +0.9 10.8 18th 34.8 51.1 average 68%
Yarram Airport 26.4   39.1 9th 12.2   4.3 4th 21.8
East Central (district 86)
Bundoora (Latrobe University) 27.3 +0.9 43.6 11th 14.2 +0.2 8.9 18th 53.7 47.1 average 114%
Cerberus 24.8 +0.6 42.7 11th 13.6 -0.1 7.6 26th 28.2 36.3 average 78%
Coldstream 28.5 +0.8 42.4 11th 11.1 -0.5 4.8 24th 59.4 44.5 average 133%
Coldstream Comparison 28.6   42.9 11th 11.0   4.7 24th 59.4
Cranbourne Botanic Gardens 25.8 +0.6 43.0 11th 13.2 -0.2 8.0 24th 41.9 53.5 average 78%
Essendon Airport 27.2 +0.9 43.4 11th 14.2 +0.9 8.9 18th 30.8 43.2 average 71%
Ferny Creek (Dunns Hill) 22.4 +0.2 37.2 11th 11.4 -0.7 4.7 18th 75.4 66.0 average 114%
Melbourne Airport 27.0 +0.8 42.5 11th 13.9 +0.3 8.6 24th 27.2 41.3 average 66%
Melbourne Regional Office 27.5 +1.6 43.6 11th 15.9 +1.6 10.4 18th 22.6 47.4 low 48%
Moorabbin Airport 26.4 +0.8 43.9 11th 14.3 +0.2 8.8 24th 46.0 44.5 average 103%
Rhyll 24.1 +0.6 39.0 11th 15.6 +0.5 10.3 18th 26.6 35.7 average 75%
Scoresby Research Institute 27.2 +1.1 42.1 11th 13.2 +0.1 6.9 24th 55.0 52.7 average 104%
Viewbank (ARPANSA) 27.6 -0.1 43.1 11th 13.9 -0.3 8.6 18th 71.8 37.6 highest 191%
Wallan (Kilmore Gap) 25.8 +1.2 39.1 11th 11.6 -0.6 5.6 18th 68.4 47.7 high 143%
Wonthaggi 24.9 +1.1 42.6 11th 13.2 +0.3 8.0 24th 30.0 48.2 average 62%
West Central (district 87)
Avalon Airport 27.0 +0.9 45.7 11th 13.6 -0.4 8.6 18th 9.2 28.7 low 32%
Grovedale (Geelong Airport) 25.5 +1.1 44.9 11th 12.4 -0.5 7.0 24th 18.0 33.3 average 54%
Laverton RAAF 26.7 +1.1 44.7 11th 14.7 +1.1 9.5 18th 21.2 39.0 average 54%
Sheoaks 26.6 +1.1 42.5 11th 11.4 -0.8 6.0 24th 20.8 32.4 low 64%
North Central (district 88)
Castlemaine Prison 29.8 +1.8 41.6 11th 12.9 0.0 3.9 19th 19.0 37.6 low 51%
Eildon Fire Tower 27.4 +0.1 38.6 11th 12.9 -0.5 4.0 18th 85.0 32.7 highest 260%
Lake Eildon 30.8 +2.1 41.3 11th 12.6 0.0 7.5 18th 85.0 46.4 high 183%
Mangalore Airport 31.7 +2.1 42.9 11th 14.1 0.0 6.7 18th 31.4 37.0 average 85%
Maryborough 30.3 +1.6 42.8 11th 13.1 +0.3 8.2 18th 17.9 29.8 average 60%
Redesdale 30.8 +1.9 42.0 11th 12.1 -0.9 6.6 18th 15.2 32.4 average 47%
Western Plains (district 89)
Ararat Prison 28.5 +1.8 40.7 11th 10.6 -0.4 3.4 19th 34.0 37.9 average 90%
Ballarat Aerodrome 26.9 +1.9 39.9 11th 11.0 +0.2 5.8 18th 25.8 38.1 average 68%
Westmere 28.4   44.2 11th 9.3   3.1 24th 30.6
West Coast (district 90)
Aireys Inlet 23.0 +0.5 37.7 31st 13.6 -0.2 8.3 18th 51.2 33.9 high 151%
Cape Nelson Lighthouse 21.9 +1.0 42.4 11th 14.7 +0.2 9.6 5th 12.2 30.5 low 40%
Cape Otway Lighthouse 21.8 +0.4 35.5 11th 13.9 +0.6 9.2 18th 14.4 43.8 low 33%
Casterton 27.6   42.4 11th 11.0   4.5 18th 12.0
Casterton Showgrounds 28.5 +1.4 42.5 11th 10.9 -0.9 6.0 24th 15.6 29.2 low 53%
Colac (Mount Gellibrand) 25.8   43.9 11th 11.8   6.3 18th 20.6 28.5 average 72%
Dartmoor 26.6   44.2 11th 10.9   5.1 24th 21.6
Hamilton Airport 27.6 +1.4 43.3 11th 10.3 -0.6 4.9 24th 12.0 32.3 low 37%
Mortlake Racecourse 26.6 +1.1 44.0 11th 9.3 -1.5 2.0 24th 23.6 30.5 average 77%
Port Fairy AWS 23.1 +0.8 44.3 11th 13.5 -0.3 7.6 24th 16.2 29.4 average 55%
Portland (Cashmore Airport) 22.0 +0.3 40.8 11th 11.2 -0.9 3.0 24th 16.4 33.7 low 49%
Warrnambool Airport NDB 24.4 +0.2 44.0 11th 10.7 -0.8 3.8 24th 25.6 32.2 average 80%
Weeaproinah 20.7 +1.0 38.1 11th 10.7 -0.1 5.3 24th 71.8 86.6 average 83%

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 2 February 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