Tuesday, 1 September 2009 - Seasonal Climate Summary for Victoria - Product code IDCKGC16R0

Victoria in winter 2009

Winter

Across winter 2009 as a whole, we have seen both overnight and daytime temperatures about 1 degree above normal, accompanied by mostly patchy rain, although above normal totals were recorded across the Western District, the Wimmera, in South Gippsland, and about the higher ranges.

August

Specifically regarding August 2009, we have seen Victoria experiencing a warm month, with both overnight and daytime temperatures between 1 and 2 degrees above the long-term normals.

Rainfall was patchy, but there were some useful falls, with above normals totals across the Western District, the Wimmera, across West and South Gippsland, and  also about the higher ranges.

August 2009 Synoptic Patterns

A feature of synoptic patterns through August 2009 has been the persistence of intense low pressure systems to the south of the Australian continent. MSL pressure has averaged between 10 and 14 hPa below normal across a wide area to the south and southwest of Tasmania.

This anomaly combined with pressures only being 2 to 4 hPa below normal across South Australia and NSW has meant that surface flow has been a stronger than usual northwesterly across Victoria (meaning that those areas exposed to such flow, such as the southwest and west of the State have had useful rains), with relatively few "cold outbreaks".

The sea surface temperatures set by the dynamics of the tropical oceans interact strongly with the tropical atmosphere, affecting winds and patterns of convection and precipitation, coupling back with the ocean dynamics. Atmospheric teleconnections can also affect conditions over many parts of the globe, including southeastern Australia.

At the end of Ausust 2009 we saw a mild warm anomaly over the central tropical Pacific, with mild warming having taken place over the previous month, which was tending towards El Niņo conditions. The temperature distribution across the tropical Indian Ocean saw a normal east-west temperature gradient.

Year

What has been observed across Victoria during the first eight months of the year have been overnight  temperatures that have been close to, or very slightly above, the long-term normals, whilst daytime temperatures have been about half a degree above normal across the State. Rainfall since the beginning of 2009 has been below normal, except in the Western District, the Wimmera, South Gippsland, and about the higher ranges.

One of the driest parts of the State has been the Melbourne metropolitan area where several localities, including the city centre, have experienced their driest first eight months of the year.

An archive of previous seasonal summaries for Victoria is also available, as are summaries for other states and many other climate summaries and diagnostics.

Further information

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

Summaries

This table is very wide and may not fit if printed.

Summary statistics for winter 2009
Maximum temperatures
for winter
(°C)
Minimum temperatures
for winter
(°C)
Rainfall
for winter
(millimetres)
Mean for
winter
2009
Diff
from
average
Highest for
winter
2009
Mean for
winter
2009
Diff
from
average
Lowest for
winter
2009
Total for
winter
2009
Average
for
winter
Rank of
winter
2009
Fraction of
winter
average
North Mallee (district 76)
Mildura Airport 17.3 +1.1 27.6 15 Aug 6.1 +1.1 −1.8 24 Jul 56.6 75.5 average 75%
Ouyen 16.7 +0.8 26.7 15 Aug 5.6 +0.8 −0.4 8 Aug 82.1 93.5 average 88%
Walpeup Research 16.3 +0.9 26.5 15 Aug 6.3 +1.0 0.3 8 Aug 89.0 97.5 average 91%
South Mallee (district 77)
Hopetoun Airport 15.9   25.8 15 Aug 4.5   −3.2 8 Aug 83.4
Swan Hill Aerodrome 15.9 +0.4 24.3 15 Aug 4.8 +0.9 −2.2 8 Aug 100.4 84.9 average 118%
North Wimmera (district 78)
Nhill Aerodrome 15.2   25.8 15 Aug 5.6   −0.3 8 Aug 114.0
Warracknabeal Museum 15.2 +0.4 24.2 15 Aug 5.4 +1.3 −0.8 8 Aug 157.8 122.0 high 129%
South Wimmera (district 79)
Edenhope Airport 14.4   23.4 15 Aug 6.0   −0.8 10 Jun 208.2
Grampians 5.9   13.4 15 Aug 1.7   −2.5 10 Jun 490.0
Horsham Aerodrome 14.5 0.0 23.5 15 Aug 4.5 +1.4 −2.8 8 Aug 169.4 116.1 high 146%
Horsham Polkemmet Rd 14.6 +0.5 23.2 15 Aug 4.9 +0.7 −2.9 8 Aug 156.0 144.9 average 108%
Kanagulk 13.9   21.1 15 Aug 5.2   −0.7 24 Jul 194.8
Longerenong 14.3 +0.4 22.6 15 Aug 4.7 +0.9 −2.3 8 Aug 162.0 131.5 high 123%
Pyrenees 8.2   14.2 15 Aug 3.6   −0.7 30 Aug 274.4
Stawell Aerodrome 13.4 +0.1 19.5 15 Aug 5.4 +1.1 0.4 17 Jun 215.2 165.5 high 130%
Lower North (district 80)
Charlton 14.6   21.5 15 Aug 5.2   −1.6 8 Aug 149.0
Echuca Aerodrome 15.1 +0.8 21.6 20 Aug 4.8 +0.4 −1.9 8 Aug 98.0 125.4 average 78%
Kerang 15.7 +0.8 23.5 15 Aug 5.3 +0.8 −1.3 8 Aug 89.5 108.0 average 83%
Kyabram DPI 14.6 +0.7 20.5 20 Aug 4.7 +1.2 −3.0 8 Aug 81.8 126.2 low 65%
Upper North (district 81)
Bendigo Airport 13.7 +0.4 19.1 6 Aug 3.7 +0.9 −3.4 8 Aug 181.8 148.6 high 122%
Shepparton Airport 14.3 0.0 19.2 28 Aug 4.2 +0.7 −3.2 24 Jul 109.6 123.0 average 89%
Tatura Inst Sustainable Ag 14.4 +0.5 19.8 6 Aug 4.3 +0.8 −3.2 24 Jul 108.0 138.0 low 78%
Yarrawonga 14.5 0.0 19.6 29 Aug 4.7 +1.0 −1.4 8 Aug 105.0 126.6 average 83%
Lower Northeast (district 82)
Benalla Airport 14.1   17.6 28 Aug 3.9   −2.6 22 Aug 156.5
Corryong Airport 12.6   18.7 28 Aug 2.2   −5.1 8 Jul 275.0
Dartmouth Reservoir 12.7 +0.2 18.3 28 Aug 3.2 +0.6 −4.1 11 Jun 275.4 342.3 low 80%
Hunters Hill 8.1 −0.1 13.1 20 Aug 3.0 +0.5 −2.2 11 Jun 448.2 424.2 average 106%
Rutherglen Research 13.9 +0.7 18.6 29 Aug 4.3 +1.8 −2.2 8 Jul 155.6 180.7 average 86%
Strathbogie 11.0 0.0 14.6 28 Aug 3.1 +1.1 −4.5 24 Jul 304.8 354.8 average 86%
Wangaratta Aero 13.9 +0.1 18.8 29 Aug 3.7 +0.9 −2.5 7 Jul 158.8 195.8 low 81%
Upper Northeast (district 83)
Dinner Plain 7.3   13.8 19 Aug −0.7   −6.9 8 Jul 205.6
Falls Creek 1.5 −0.5 7.1 23 Jun −2.2 +0.2 −7.0 11 Jun 241.0 287.4 low 84%
Mount Buller 1.6 −0.7 6.8 23 Jun −2.0 +0.1 −7.1 24 Jul 705.0 484.7 very high 145%
Mount Hotham 0.2 −0.5 5.7 23 Jun −3.3 −0.2 −7.9 11 Jun 452.8 369.0 average 123%
Omeo 11.9   16.3 28 Aug 1.8   −5.9 8 Jul 108.6
East Gippsland (district 84)
Combienbar AWS 13.2 +1.3 20.9 16 Aug 6.1 +0.9 0.0 10 Jun 155.8 225.4 low 69%
Gabo Island Lighthouse 16.1 +1.7 23.0 24 Aug 9.2 +0.5 5.5 18 Jul 139.6 260.9 low 54%
Gelantipy 11.2 +0.9 16.5 29 Aug 3.7 +1.0 −1.7 24 Jul 92.0 151.8 low 61%
Lakes Entrance 16.5   23.2 15 Aug 6.5   −1.8 9 Jul 145.4
Mallacoota 16.4 +1.1 23.7 16 Aug 6.3 −0.4 1.5 25 Jul 172.8 233.1 average 74%
Mount Nowa Nowa 14.6 +1.1 20.8 28 Aug 7.1 +0.7 2.6 10 Jun 129.8 189.4 low 69%
Orbost 16.5   24.5 16 Aug 6.3   0.3 8 Jul 123.2
Orbost 17.0 +1.7 24.7 16 Aug 5.0 +0.3 −1.3 8 Jul 122.2 210.9 low 58%
Point Hicks 15.8 +1.2 24.7 16 Aug 9.2 +0.6 4.9 10 Jun 233.1 281.7 average 83%
West Gippsland (district 85)
Bairnsdale Airport 16.6 +1.6 23.4 16 Aug 4.7 +0.4 −3.5 8 Jul 78.4 147.8 low 53%
East Sale Airport 15.7 +1.3 22.5 16 Aug 3.8 0.0 −3.9 8 Jul 82.0 133.8 low 61%
Morwell 15.1 +1.0 21.8 21 Jul 4.4 +0.3 −2.7 10 Jul 156.2 187.2 low 83%
Mount Baw Baw 2.9 −0.2 9.8 23 Jun −1.1 −0.1 −5.7 8 Aug 350.2
Mount Moornapa 13.9 +1.2 20.4 15 Aug 6.4 +0.7 1.2 10 Jun 125.6 194.1 average 65%
Noojee 13.6 +0.9 18.2 15 Aug 4.3 +0.7 −1.9 8 Jul 307.8 315.7 average 97%
Pound Creek 14.7   20.6 15 Aug 6.1   −1.9 8 Jul 288.8
Wilsons Promontory Lighthouse 13.7 +1.1 23.2 15 Aug 9.8 +1.2 6.2 2 Jul 620.0 361.6 very high 171%
Yarram Airport 15.6   21.5 30 Jun 5.1   −2.1 9 Jul 162.8
East Central (district 86)
Bundoora 14.9 +0.9 20.0 21 Jul 6.6 +0.8 −1.0 8 Jul 134.4 161.7 low 83%
Cerberus 14.6 +0.5 20.0 15 Aug 6.7 +0.1 −0.8 8 Jul 211.2 221.7 average 95%
Coldstream 14.5 +0.5 19.2 15 Aug 4.2 +0.3 −3.5 8 Jul 176.6 189.6 average 93%
Cranbourne Botanic Gardens 14.4 +0.5 19.2 16 Aug 6.6 +0.3 2.0 8 Jul 232.6 224.2 average 104%
Essendon Airport 15.1 +1.5 19.7 28 Aug 6.7 +1.2 −0.2 8 Jul 91.0 131.9 low 69%
Ferny Creek 10.3 +0.7 15.0 15 Aug 5.6 +0.3 0.8 10 Jun 261.2 259.5 average 101%
Frankston AWS 14.0 +0.7 19.5 15 Aug 8.7 +0.5 3.7 8 Jul
Melbourne Airport 14.7 +1.0 19.0 28 Aug 6.4 +0.6 0.9 8 Jul 80.2 120.3 low 67%
Melbourne Regional Office 15.9 +1.7 19.7 28 Aug 8.3 +1.8 3.4 8 Jul 106.8 146.8 low 73%
Moorabbin Airport 15.2 +1.0 20.4 15 Aug 7.0 +0.5 −0.8 8 Jul 147.8 185.5 low 80%
Rhyll 14.2 +0.5 19.0 15 Aug 8.7 +0.3 4.5 8 Jul 196.8 197.3 average 100%
Scoresby Research Institute 14.7 +1.1 19.1 15 Aug 6.7 +0.6 −0.6 8 Jul 179.6 225.2 low 80%
Viewbank 15.1   20.2 15 Aug 6.6   −0.5 8 Jul 158.2 154.1 average 103%
Wallan 10.1 +0.3 14.0 28 Aug 4.6 +0.3 0.4 22 Aug 168.2 181.3 average 93%
Wonthaggi 14.8 +0.7 20.0 15 Aug 6.8 +0.3 2.1 8 Jul 305.3 297.1 average 103%
West Central (district 87)
Avalon Airport 15.7 +0.9 22.8 15 Aug 5.8 +0.4 −1.9 8 Jul 103.8 118.8 average 87%
Grovedale 14.9 +0.5 21.4 15 Aug 6.1 +0.3 −1.4 8 Jul 106.0 139.3 low 76%
Laverton RAAF 15.8 +1.6 20.9 28 Aug 6.5 +1.1 −2.1 8 Jul 79.8 122.8 very low 65%
Sheoaks 13.6 +0.8 19.8 15 Aug 5.8 +0.5 −2.0 8 Jul 102.0 118.8 average 86%
North Central (district 88)
Castlemaine Prison 12.9 +0.3 17.5 28 Aug 4.3 +1.1 −2.4 11 Jun 190.2 185.1 average 103%
Eildon Fire Tower 10.0 0.0 14.6 28 Aug 4.7 +0.4 −0.3 10 Jun 179.8 206.9 average 87%
Lake Eildon 13.3 +0.6 18.9 15 Aug 5.0 +1.0 −1.2 7 Jul 226.9 286.3 low 79%
Mangalore Airport 13.6 +0.3 18.4 6 Aug 4.2 +0.6 −2.7 8 Aug 99.0 175.3 very low 56%
Maryborough 13.6 +0.6 18.9 30 Jun 4.5 +0.7 −2.8 8 Aug 181.5 166.0 average 109%
Redesdale 12.8 +0.2 16.8 28 Aug 3.7 +0.4 −2.5 8 Aug 192.8 185.7 average 104%
Western Plains (district 89)
Ararat Prison 13.1 +0.8 18.6 15 Aug 4.8 +1.2 −1.8 24 Jul 200.0 186.2 average 107%
Ballarat Aerodrome 11.7 +0.9 15.7 30 Jun 3.8 +0.2 −2.3 16 Jul 190.6 204.2 average 93%
Westmere 13.2   18.6 15 Aug 5.0   −1.7 8 Jul 216.2
West Coast (district 90)
Aireys Inlet 14.3 +0.5 20.5 15 Aug 7.8 +0.2 3.5 18 Jun 227.6 186.4 average 122%
Cape Nelson Lighthouse 14.7 +0.6 22.7 15 Aug 8.7 0.0 3.8 17 Jul 368.8 281.7 high 131%
Cape Otway Lighthouse 13.6 +0.1 20.1 15 Aug 8.7 +0.7 4.1 8 Jul 399.6 305.7 very high 131%
Casterton 14.0   21.1 15 Aug 5.8   −0.9 17 Jul 269.0
Casterton Showgrounds 14.6 +0.5 20.9 15 Aug 5.8 +0.5 −1.1 18 Jun 288.3 238.7 high 121%
Colac 12.3   18.0 30 Jun 5.9   2.0 8 Aug 194.8
Dartmoor 14.5   22.8 15 Aug 6.0   −0.2 23 Jul 372.4
Hamilton Airport 13.1 +0.3 19.4 15 Aug 5.3 +0.6 −0.6 17 Jul 241.8 213.3 average 113%
Mortlake Racecourse 13.8 +0.5 19.4 30 Jun 5.1 +0.4 −1.5 17 Jul 188.6 171.5 average 110%
Port Fairy AWS 15.1 +0.5 22.6 15 Aug 7.1 −0.2 1.1 8 Jul 426.4 249.3 very high 171%
Portland 14.0 +0.4 21.2 15 Aug 6.6 0.0 −1.5 8 Jul 384.6 315.8 high 122%
Warrnambool Airport NDB 14.3 +0.2 21.0 15 Aug 6.0 +0.4 0.5 8 Jul 313.4 245.0 very high 128%
Weeaproinah 10.1 +0.6 16.0 15 Aug 5.5 +0.5 1.3 10 Jun 733.4 669.8 average 109%

Notes

This statement has been prepared based on information available at 11 am on Tuesday 1 September 2009. 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

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