Tuesday, 2 February 2010 - Monthly Climate Summary for Victoria - Product code IDCKGC26R0
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.
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.
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 0.1°C), whilst daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.4°C). Over the northern plains, overnight minimum temperatures were near to those usually experienced (average departure from normal 0°C), whilst daytime maximum temperatures at most localities were much warmer than those registered in the past (average departure from normal 2°C). .
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 15.9°C (departure from normal 1.6°C). Daytime maximum temperatures were much warmer than those usually experienced and averaged 27.5°C (departure from normal 1.6°C).
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 13.9°C (departure from normal 0.3°C). Daytime maximum temperatures were slightly warmer than those usually experienced and averaged 27°C (departure from normal 0.8°C).
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 30.6°C 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).
|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|
Anomaly in mean maximum temperature
Mean maximum temperature
Anomaly in mean minimum temperature
Mean minimum temperature
|Record highest January temperature|
in January 2010 (°C)
|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
in January 2010 (°C)
|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
in January 2010 (°C)
|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|
in January 2010 (°C)
|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|
|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)|
|Ouyen (Post Office)||34.2||+1.9||45.4||10th||16.2||+0.8||9.9||19th||8.2||20.3||average||40%|
|South Mallee (district 77)|
|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)|
|South Wimmera (district 79)|
|Grampians (Mount William)||21.2||35.3||11th||9.6||1.8||18th||23.2|
|Horsham Polkemmet Rd||31.6||+1.8||44.6||11th||11.2||-1.9||5.1||19th||8.2||23.0||average||36%|
|Pyrenees (Ben Nevis)||24.8||38.0||11th||11.8||3.4||18th||32.2|
|Lower North (district 80)|
|Upper North (district 81)|
|Tatura Inst Sustainable Ag||31.9||+2.4||42.1||11th||14.3||+0.3||7.6||19th||20.4||32.4||average||63%|
|Lower Northeast (district 82)|
|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%|
|East Gippsland (district 84)|
|Gabo Island Lighthouse||22.8||+1.6||32.1||9th||17.1||+1.4||11.8||18th||15.2||70.6||low||22%|
|Lakes Entrance (Eastern Beach Road)||24.8||40.6||12th||14.9||10.0||18th||56.0|
|Mount Nowa Nowa||25.5||+0.8||39.3||9th||13.8||-0.3||6.4||18th||55.8||59.6||average||94%|
|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)|
|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%|
|Wilsons Promontory Lighthouse||21.8||+1.6||36.1||11th||14.9||+0.9||10.8||18th||34.8||51.1||average||68%|
|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%|
|Cranbourne Botanic Gardens||25.8||+0.6||43.0||11th||13.2||-0.2||8.0||24th||41.9||53.5||average||78%|
|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 Regional Office||27.5||+1.6||43.6||11th||15.9||+1.6||10.4||18th||22.6||47.4||low||48%|
|Scoresby Research Institute||27.2||+1.1||42.1||11th||13.2||+0.1||6.9||24th||55.0||52.7||average||104%|
|Wallan (Kilmore Gap)||25.8||+1.2||39.1||11th||11.6||-0.6||5.6||18th||68.4||47.7||high||143%|
|West Central (district 87)|
|Grovedale (Geelong Airport)||25.5||+1.1||44.9||11th||12.4||-0.5||7.0||24th||18.0||33.3||average||54%|
|North Central (district 88)|
|Eildon Fire Tower||27.4||+0.1||38.6||11th||12.9||-0.5||4.0||18th||85.0||32.7||highest||260%|
|Western Plains (district 89)|
|West Coast (district 90)|
|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%|
|Colac (Mount Gellibrand)||25.8||43.9||11th||11.8||6.3||18th||20.6||28.5||average||72%|
|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%|
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
(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.