Tuesday, 1 September 2009 - Monthly Climate Summary for Victoria - Product code IDCKGC26R0

Victoria in August 2009
Warm nights and days; useful rainfall in some areas.

August 2009 saw 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.

Winter

Across winter 2009 as a whole, the weather story was similar to that of August, with 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.

Year

These anomalies are reflected in what has been observed across Victoria during the first eight months of the year. Overnight  temperatures 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. As for winter, 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 monthly 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 August 2009
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2009
Diff
from
average
Highest for
August
2009
Mean for
August
2009
Diff
from
average
Lowest for
August
2009
Total for
August
2009
Average
for
August
Rank of
August
2009
Fraction of
August
average
North Mallee (district 76)
Mildura Airport 19.6 +2.4 27.6 15th 6.4 +1.2 −1.4 8th 7.8 26.1 low 30%
Ouyen 19.0 +1.9 26.7 15th 5.9 +0.9 −0.4 8th 20.2 32.6 low 62%
Walpeup Research 18.5 +2.2 26.5 15th 6.3 +1.0 0.3 8th 18.6 34.8 low 53%
South Mallee (district 77)
Hopetoun Airport 17.9   25.8 15th 4.0   −3.2 8th 24.8
Swan Hill Aerodrome 18.2 +1.5 24.3 15th 4.8 +0.9 −2.2 8th 16.0 27.0 average 59%
North Wimmera (district 78)
Nhill Aerodrome 16.5   25.8 15th 5.8   −0.3 8th 37.4
Warracknabeal Museum 16.8 +1.1 24.2 15th 5.6 +1.3 −0.8 8th 50.8 43.3 average 117%
South Wimmera (district 79)
Edenhope Airport 15.4   23.4 15th 6.9   2.1 8th 95.2
Grampians 6.7   13.4 15th 1.5   −2.5 30th 168.8
Horsham Aerodrome 15.9 +0.6 23.5 15th 4.6 +1.7 −2.8 8th 49.2 37.7 high 131%
Horsham Polkemmet Rd 16.1 +1.1 23.2 15th 4.4 +0.1 −2.9 8th 46.4 48.4 average 96%
Kanagulk 15.0   21.1 15th 5.7   −0.6 8th 84.6
Longerenong 15.7 +0.8 22.6 15th 4.6 +0.6 −2.3 8th 47.4 43.6 average 109%
Pyrenees 9.3   14.2 15th 3.4   −0.7 30th 88.8
Stawell Aerodrome 14.6 +0.5 19.5 15th 6.0 +1.5 0.5 8th 68.2 52.3 average 130%
Lower North (district 80)
Charlton 16.1   21.5 15th 5.3   −1.6 8th 31.8
Echuca Aerodrome 16.9 +1.6 21.6 20th 5.1 +0.3 −1.9 8th 19.0 41.8 low 45%
Kerang 17.9 +1.8 23.5 15th 5.6 +0.7 −1.3 8th 18.8 36.8 low 51%
Kyabram DPI 16.4 +1.5 20.5 20th 5.0 +1.2 −3.0 8th 17.8 42.0 low 42%
Upper North (district 81)
Bendigo Airport 15.1 +0.9 19.1 6th 4.1 +1.7 −3.4 8th 53.6 46.3 average 116%
Shepparton Airport 15.7 +0.6 19.2 28th 4.6 +1.1 −2.6 8th 26.2 44.9 low 58%
Tatura Inst Sustainable Ag 15.8 +1.1 19.8 6th 4.9 +1.1 −3.1 8th 27.8 46.6 low 60%
Yarrawonga 15.8 +0.4 19.6 29th 4.9 +1.3 −1.4 8th 27.2 36.7 average 74%
Lower Northeast (district 82)
Benalla Airport 15.0   17.6 28th 4.3   −2.6 22nd 40.9
Corryong Airport 13.7   18.7 28th 2.7   −3.4 9th 115.0
Dartmouth Reservoir 13.5 0.0 18.3 28th 4.3 +1.7 −2.0 8th 108.2 125.0 average 87%
Hunters Hill 8.6 −0.4 13.1 20th 3.1 +0.4 −0.7 8th 121.8 134.2 average 91%
Rutherglen Research 14.8 +0.8 18.6 29th 4.8 +2.1 −1.8 8th 40.4 60.5 low 67%
Strathbogie 11.8 +0.2 14.6 28th 3.8 +1.5 −3.4 8th 95.0 115.8 average 82%
Wangaratta Aero 14.8 +0.3 18.8 29th 4.3 +1.4 −2.2 8th 38.8 56.8 average 68%
Upper Northeast (district 83)
Dinner Plain 8.0   13.8 19th 0.2   −6.6 8th 110.4
Falls Creek 1.9 −0.1 4.8 23rd −2.0 +0.5 −5.9 8th 98.4 83.5 average 118%
Mount Buller 1.9 −0.2 5.5 15th −2.3 −0.1 −5.6 8th 231.8 145.8 high 159%
Mount Hotham 0.7 +0.1 4.5 18th −3.3 0.0 −7.0 8th 172.8 136.7 average 126%
Omeo 12.8   16.3 28th 3.4   −3.3 9th 57.8
East Gippsland (district 84)
Combienbar AWS 15.0 +2.3 20.9 16th 6.8 +1.6 2.9 8th 44.2 59.0 average 75%
Gabo Island Lighthouse 17.3 +2.6 23.0 24th 9.4 +0.9 6.1 9th 23.8 72.1 low 33%
Gelantipy 12.7 +1.5 16.5 29th 4.5 +1.8 −0.3 8th 33.8 48.1 average 70%
Lakes Entrance 18.1   23.2 15th 7.7   2.6 19th 46.6
Mallacoota 17.7 +2.1 23.7 16th 6.4 0.0 2.4 9th 31.8 64.9 low 49%
Mount Nowa Nowa 16.4 +2.0 20.8 28th 7.7 +1.4 3.4 26th 47.8 52.8 low 91%
Orbost 18.1   24.5 16th 7.3   2.5 9th 38.4
Orbost 18.6 +2.6 24.7 16th 6.0 +1.2 −0.1 9th 37.2 58.4 low 64%
Point Hicks 16.8 +1.9 24.7 16th 9.4 +0.9 5.6 4th 48.2 78.6 low 61%
West Gippsland (district 85)
Bairnsdale Airport 18.1 +2.5 23.4 16th 5.7 +1.3 −0.3 9th 38.0 35.6 average 107%
East Sale Airport 16.9 +1.9 22.5 16th 5.0 +0.8 −0.4 9th 40.6 46.1 average 88%
Morwell 16.2 +1.4 20.9 16th 5.7 +1.4 −1.0 9th 81.2 63.1 high 129%
Mount Baw Baw 3.3 +0.1 8.4 15th −1.5 −0.3 −5.7 8th 161.2
Mount Moornapa 15.4 +1.8 20.4 15th 6.7 +1.1 2.1 8th 56.6 45.5 average 124%
Noojee 14.2 +0.8 18.2 15th 5.6 +2.0 −0.6 8th 129.8 108.3 high 120%
Pound Creek 15.3   20.6 15th 7.5   4.6 15th 126.8
Wilsons Promontory Lighthouse 14.4 +1.6 23.2 15th 9.6 +1.3 6.4 30th 224.6 120.5 very high 186%
Yarram Airport 16.0   20.8 16th 6.9   0.5 9th 69.4
East Central (district 86)
Bundoora 15.9 +1.1 19.2 15th 7.8 +1.8 3.0 8th 45.9 57.1 low 80%
Cerberus 15.5 +0.9 20.0 15th 8.1 +1.6 3.4 12th 77.8 76.2 average 102%
Coldstream 15.2 +0.4 19.2 15th 5.9 +1.7 −2.0 8th 58.4 65.4 average 89%
Coldstream Comparison 15.4   19.3 28th 5.8   −2.2 8th 55.0
Cranbourne Botanic Gardens 15.2 +0.7 19.2 16th 7.5 +1.3 3.0 8th 92.7 79.1 high 117%
Essendon Airport 16.2 +2.0 19.7 28th 7.7 +2.3 2.6 8th 30.2 49.1 low 62%
Ferny Creek 11.1 +0.7 15.0 15th 5.3 +0.1 1.6 30th 84.6 85.7 average 99%
Frankston AWS 14.5 +0.8 19.5 15th 9.4 +1.1 5.2 8th
Melbourne Airport 15.8 +1.5 19.0 28th 7.4 +1.5 2.7 8th 35.6 46.4 average 77%
Melbourne Regional Office 16.9 +1.9 19.7 28th 9.2 +2.5 3.8 8th 41.4 50.1 average 83%
Moorabbin Airport 16.0 +1.2 20.4 15th 8.5 +1.7 3.5 8th 48.4 66.6 low 73%
Rhyll 15.0 +0.7 19.0 15th 9.2 +0.9 6.6 8th 83.0 76.5 average 108%
Scoresby Research Institute 15.5 +1.3 19.1 15th 8.0 +1.8 2.0 8th 65.6 80.9 average 81%
Viewbank 16.1   20.2 15th 8.0   0.8 8th 45.6 57.0 average 80%
Wallan 11.1 +0.5 14.0 28th 4.3 +0.1 0.4 22nd 72.0 58.5 average 123%
Wonthaggi 15.2 +0.8 20.0 15th 7.8 +1.1 2.5 26th 136.6 102.3 high 134%
West Central (district 87)
Avalon Airport 17.1 +1.6 22.8 15th 7.2 +1.8 1.5 8th 48.2 44.2 average 109%
Grovedale 15.8 +0.9 21.4 15th 6.9 +1.2 0.5 8th 48.6 48.2 average 101%
Laverton RAAF 17.0 +2.2 20.9 28th 7.7 +2.3 2.1 8th 31.2 45.0 low 69%
Sheoaks 14.3 +0.9 19.8 15th 7.0 +1.8 2.8 4th 51.4 44.4 average 116%
North Central (district 88)
Castlemaine Prison 14.0 +0.7 17.5 28th 4.6 +1.1 −1.5 8th 65.8 66.4 average 99%
Eildon Fire Tower 10.7 +0.2 14.6 28th 4.8 +0.5 1.2 8th 62.8 74.2 average 85%
Lake Eildon 14.3 +0.7 18.9 15th 5.6 +1.4 −0.2 8th 75.3 99.0 average 76%
Mangalore Airport 14.8 +0.7 18.4 6th 4.8 +0.9 −2.7 8th 32.8 62.5 low 52%
Maryborough 15.0 +1.1 17.9 28th 4.5 +0.6 −2.8 8th 56.5 56.1 average 101%
Redesdale 13.9 +0.4 16.8 28th 3.7 +0.7 −2.5 8th 64.8 60.2 average 108%
Western Plains (district 89)
Ararat Prison 14.2 +1.2 18.6 15th 5.7 +1.9 −1.4 8th 68.8 67.5 average 102%
Ballarat Aerodrome 12.5 +1.1 15.6 28th 4.2 +0.5 −1.9 8th 65.2 74.5 average 88%
Westmere 14.1   18.6 15th 6.3   1.6 8th 94.2
West Coast (district 90)
Aireys Inlet 14.9 +0.4 20.5 15th 7.9 +0.4 3.9 8th 103.8 67.2 high 154%
Cape Nelson Lighthouse 15.4 +1.0 22.7 15th 9.4 +0.8 5.8 22nd 136.0 100.1 high 136%
Cape Otway Lighthouse 14.1 +0.2 20.1 15th 9.0 +1.2 6.1 30th 170.6 102.8 very high 166%
Casterton 14.9   21.1 15th 6.7   2.5 3rd 98.0
Casterton Showgrounds 15.4 +0.8 20.9 15th 7.2 +1.7 3.5 9th 100.2 85.0 average 118%
Colac 13.0   17.2 15th 5.9   2.0 8th 90.6 59.9 very high 151%
Dartmoor 15.4   22.8 15th 7.4   3.9 9th 142.4
Hamilton Airport 13.9 +0.6 19.4 15th 6.1 +1.3 1.9 8th 94.6 77.6 average 122%
Mortlake Racecourse 14.6 +0.8 19.3 15th 6.3 +1.7 1.1 8th 83.4 61.9 high 135%
Port Fairy AWS 16.0 +0.9 22.6 15th 8.1 +0.9 3.6 9th 139.6 83.6 high 167%
Portland 14.8 +0.9 21.2 15th 7.9 +1.3 5.1 22nd 129.8 102.7 high 126%
Warrnambool Airport NDB 15.0 +0.6 21.0 15th 7.3 +1.8 2.3 9th 127.2 90.7 high 140%
Weeaproinah 10.6 +0.6 16.0 15th 5.3 +0.6 1.6 30th 312.4 231.8 high 135%

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