Monday, 3 August 2009 - Monthly Climate Summary for Victoria - Product code IDCKGC26R0

Victoria in July 2009:

Warm and dry conditions continue.

Note that Melbourne's rainfall total for the year thus far is 165.4 mm, the lowest January to July total since 1976 (when 159.9 mm fell).

Preliminary data for July 2009 shows that the relatively warm and relatively dry conditions, that have been a feature of the weather over recent times (refer to the Table below for Melbourne average conditions prior to, and since the start of, the current decade), continues.

Both overnight and daytime temperatures during the month averaged between half a degree and one degree above long-term normals throughout the State, whilst rainfall was somewhat below normal in most districts - the exceptions were the southwest and about the ranges.

The reason for the mostly drier conditions (than usual) during the month relates to a high frequency of westerly or northwesterly synoptic types which, for the most part, were relatively benign (in that they were not accompanied with northwest cloud bands, which normally bring Victoria quite a deal of rainfall ahead of cold fronts).

The reason for the mostly warmer conditions (than usual) during the month relates to the almost a complete absence of southwesterly or southerly synoptic types, which usually bring "cold outbreaks" to Victoria, accompanied by snowfalls on the ranges down to low levels, and followed by spells of frosty nights once the weather clears.

Specifically for Melbourne for the month thus far:

- Only 39.6 mm of rain has fallen (compared to the average over all years of record of 46.2 mm; the average for July 1855−1999 of  48.2 mm; and, the average for July since 2000 of 39.8 mm),

- The average minimum temperature has been 8.2°C (compared to the average over all years of record of 5.9°C; the average for July 1855−1999 of 5.9°C; and, the average for July since 2000 of 7.5°C); and,

- The average maximum temperature has been 15.2°C (compared to the average over all years of record of 13.5°C; the average for July 1855−1999 of 13.4°C; and, the average for July since 2000 of 14.6°C).

Further information

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

Maps

Anomaly in mean maximum temperature

Map of Anomaly in mean maximum temperature

Anomaly in mean minimum temperature

Map of Anomaly in mean minimum temperature

Rainfall deciles

Map of Rainfall deciles


Summaries

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

Summary statistics for July 2009
Maximum temperatures
for July
(°C)
Minimum temperatures
for July
(°C)
Rainfall
for July
(millimetres)
Mean for
July
2009
Diff
from
average
Highest for
July
2009
Mean for
July
2009
Diff
from
average
Lowest for
July
2009
Total for
July
2009
Average
for
July
Rank of
July
2009
Fraction of
July
average
North Mallee (district 76)
Mildura Airport 16.2 +0.9 24.9 21st 5.2 +0.8 −1.8 24th 12.2 26.1 low 47%
Ouyen 15.6 +0.4 21.2 21st 5.1 +0.8 −0.2 24th 25.4 31.2 average 81%
Walpeup Research 15.1 +0.5 21.2 21st 5.6 +0.9 1.2 23rd 29.6 33.3 average 89%
South Mallee (district 77)
Hopetoun Airport 14.8   20.0 20th 4.1   −2.2 24th 29.6
Swan Hill Aerodrome 14.8 +0.2 19.9 20th 4.3 +0.8 −1.3 24th 26.6 28.9 average 92%
North Wimmera (district 78)
Nhill Aerodrome 14.5   19.4 20th 5.2   0.7 24th 40.0
Warracknabeal Museum 14.4 +0.5 20.0 20th 5.0 +1.3 −0.6 24th 39.2 40.4 average 97%
South Wimmera (district 79)
Edenhope Airport 13.7   17.5 20th 5.4   −0.5 23rd 78.4
Grampians 5.1   11.5 21st 1.2   −1.7 23rd 196.8
Horsham Aerodrome 13.8 +0.1 18.2 20th 4.2 +1.2 −1.0 24th 62.0 39.7 very high 156%
Horsham Polkemmet Rd 13.7 +0.4 18.5 20th 4.8 +1.2 0.0 8th 58.0 46.9 high 124%
Kanagulk 13.1   17.7 20th 4.8   −0.7 24th 63.0
Longerenong 13.6 +0.5 18.4 20th 4.4 +1.1 −0.9 24th 54.8 42.6 high 129%
Pyrenees 7.1   11.8 21st 3.1   0.2 23rd 97.8
Stawell Aerodrome 12.6 +0.1 17.0 20th 5.0 +1.0 0.5 17th 79.6 56.2 average 142%
Lower North (district 80)
Charlton 13.8   18.7 20th 4.7   −1.3 24th 54.0
Echuca Aerodrome 14.1 +0.7 19.0 20th 4.1 +0.2 −1.8 24th 32.0 40.9 average 78%
Kerang 14.8 +0.7 19.5 20th 4.7 +0.7 −1.2 24th 30.5 35.4 average 86%
Kyabram DPI 13.6 +0.6 17.8 20th 3.8 +0.8 −2.5 24th 12.0 43.7 very low 27%
Upper North (district 81)
Bendigo Airport 12.8 +0.3 17.2 20th 2.9 +0.5 −2.6 24th 67.0 51.3 high 131%
Shepparton Airport 13.3 0.0 18.0 20th 3.3 +0.2 −3.2 24th 34.6 41.9 average 83%
Tatura Inst Sustainable Ag 13.4 +0.4 18.2 20th 3.4 +0.4 −3.2 24th 36.6 48.5 average 75%
Yarrawonga 13.4 0.0 18.0 20th 3.8 +0.4 −1.1 24th 33.0 48.0 low 69%
Lower Northeast (district 82)
Benalla Airport 13.2   17.4 20th 3.3   −2.3 24th 47.8
Corryong Airport 11.9   16.0 21st 1.4   −5.1 8th 79.6
Dartmouth Reservoir 11.9 +0.3 15.7 20th 2.3 +0.1 −2.7 8th 92.4 113.0 average 82%
Hunters Hill 7.1 0.0 12.5 21st 2.2 +0.4 −0.2 7th 199.6 152.5 high 131%
Rutherglen Research 12.9 +0.5 17.2 20th 3.6 +1.5 −2.2 8th 36.6 61.9 low 59%
Strathbogie 10.1 0.0 14.0 21st 2.8 +1.2 −4.5 24th 105.8 123.6 average 86%
Wangaratta Aero 13.1 +0.2 17.8 21st 3.0 +0.6 −2.5 7th 53.4 66.9 average 80%
Upper Northeast (district 83)
Dinner Plain 6.2   10.7 21st −1.5   −6.9 8th 79.2 67.3 high 118%
Edi Upper 12.0 +0.1 16.8 21st 4.2 +0.7 −0.5 7th 111.0 124.5 average 89%
Falls Creek 0.2 −0.8 3.6 21st −3.2 −0.3 −6.2 7th 99.8 76.7 high 130%
Mount Buller 0.4 −1.1 4.3 21st −2.6 0.0 −7.1 24th 300.8 163.5 very high 184%
Mount Hotham −1.1 −1.1 1.9 21st −4.2 −0.6 −7.2 7th 176.8 128.4 high 138%
Omeo 11.0   15.5 21st 1.0   −5.9 8th 37.8
East Gippsland (district 84)
Combienbar AWS 11.7 +0.7 17.3 21st 5.2 +0.5 2.0 24th 58.2 80.0 average 73%
Gabo Island Lighthouse 15.4 +1.4 20.9 22nd 8.5 +0.3 5.5 18th 30.2 86.6 very low 35%
Gelantipy 10.2 +0.7 15.4 21st 2.9 +0.8 −1.7 24th 34.6 49.4 average 70%
Lakes Entrance 16.0   22.5 21st 6.0   −1.8 9th 38.4
Mallacoota 15.6 +0.8 21.0 22nd 5.5 −0.8 1.5 25th 53.2 81.5 average 65%
Mount Nowa Nowa 13.9 +1.1 19.4 21st 6.5 +0.7 3.0 24th 33.2 61.5 low 54%
Orbost 15.8   22.6 21st 6.0   0.3 8th 36.8
Orbost 16.4 +1.6 23.4 21st 4.7 +0.5 −1.3 8th 39.8 67.4 average 59%
Point Hicks 15.2 +1.0 20.0 12th 8.8 +0.6 5.2 24th 93.1 98.3 average 95%
West Gippsland (district 85)
Bairnsdale Airport 16.0 +1.6 22.4 21st 4.4 +0.5 −3.5 8th 22.4 51.0 low 44%
East Sale Airport 15.0 +1.3 22.0 21st 3.5 +0.3 −3.9 8th 24.6 41.5 average 59%
Morwell 14.4 +0.9 21.8 21st 4.0 +0.3 −2.7 10th 57.6 66.5 average 87%
Mount Baw Baw 1.5 −0.9 7.0 21st −1.7 −0.2 −5.6 24th 136.2
Mount Moornapa 13.1 +1.2 19.4 21st 5.9 +0.8 2.0 24th 36.6 55.7 average 66%
Noojee 12.9 +0.9 18.0 21st 4.1 +1.2 −1.9 8th 109.0 105.1 average 104%
Pound Creek 14.1   20.1 21st 6.6   −1.9 8th 101.4
Wilsons Promontory Lighthouse 13.0 +0.8 20.1 21st 9.4 +1.1 6.2 2nd 258.0 122.4 very high 211%
Yarram Airport 14.7   21.4 21st 5.3   −2.1 9th 62.8
East Central (district 86)
Bundoora 14.2 +1.0 20.0 21st 6.3 +0.9 −1.0 8th 46.6 49.3 average 95%
Cerberus 14.3 +0.8 18.8 21st 6.8 +0.7 −0.8 8th 89.6 75.5 average 119%
Coldstream 13.8 +0.6 18.9 21st 3.9 +0.3 −3.5 8th 68.6 60.1 average 114%
Cranbourne Botanic Gardens 13.8 +0.6 19.0 21st 6.8 +0.7 2.0 8th 96.1 69.8 high 138%
Essendon Airport 14.3 +1.4 18.5 21st 6.4 +1.2 −0.2 8th 31.0 44.0 low 70%
Ferny Creek 9.4 +0.4 14.3 21st 5.2 +0.3 2.9 23rd 119.0 85.3 average 140%
Frankston AWS 13.4 +0.7 18.9 21st 8.8 +1.0 3.7 8th
Melbourne Airport 13.9 +0.9 18.0 20th 5.8 +0.5 0.9 8th 24.8 36.0 average 69%
Melbourne Regional Office 15.2 +1.7 19.6 21st 8.2 +2.2 3.4 8th 39.6 47.7 average 81%
Moorabbin Airport 14.5 +0.9 19.7 21st 7.0 +1.0 −0.8 8th 66.0 62.7 average 105%
Rhyll 13.8 +0.6 17.1 21st 8.6 +0.6 4.5 8th 80.8 65.8 average 123%
Scoresby Research Institute 14.1 +1.1 18.9 21st 6.5 +0.8 −0.6 8th 74.6 74.4 average 100%
Viewbank 14.4   19.9 21st 6.3   −0.5 8th 50.4 49.1 average 103%
Wallan 9.2 +0.3 13.6 20th 4.0 +0.2 0.9 27th 47.4 58.1 average 82%
Wonthaggi 14.2 +0.7 19.1 21st 6.9 +0.8 2.1 8th 103.7 99.3 average 104%
West Central (district 87)
Avalon Airport 15.1 +1.2 21.4 21st 5.6 +0.7 −1.9 8th 30.8 38.4 average 80%
Grovedale 14.4 +0.6 20.5 21st 6.1 +0.8 −1.4 8th 32.8 50.3 low 65%
Laverton RAAF 15.2 +1.6 19.6 20th 6.0 +1.1 −2.1 8th 29.8 39.3 average 76%
Sheoaks 12.8 +0.7 18.9 21st 5.7 +0.7 −2.0 8th 29.8 40.2 average 74%
North Central (district 88)
Castlemaine Prison 12.0 +0.3 16.2 20th 3.8 +1.1 −1.9 7th 73.4 61.2 average 120%
Eildon Fire Tower 9.0 −0.1 13.8 21st 4.2 +0.3 0.8 24th 61.6 66.1 average 93%
Lake Eildon 12.6 +0.7 18.1 21st 4.1 +0.6 −1.2 7th 85.3 93.8 average 91%
Mangalore Airport 12.8 +0.4 17.2 20th 3.6 +0.5 −2.3 24th 32.6 58.6 low 56%
Maryborough 12.7 +0.4 17.7 20th 3.7 +0.4 −1.3 24th 58.9 53.7 average 110%
Redesdale 12.0 +0.2 16.3 20th 3.0 0.0 −1.5 24th 78.0 65.4 average 119%
Western Plains (district 89)
Ararat Prison 12.2 +0.5 15.7 20th 4.3 +1.0 −1.8 24th 71.6 62.6 average 114%
Ballarat Aerodrome 10.7 +0.7 14.9 20th 3.5 +0.3 −2.3 16th 66.8 66.5 average 100%
Westmere 12.4   15.8 20th 4.5   −1.7 8th 74.8
West Coast (district 90)
Aireys Inlet 13.8 +0.4 17.7 21st 7.6 +0.4 4.4 8th 79.8 65.5 average 122%
Cape Nelson Lighthouse 13.8 +0.1 16.9 25th 8.3 0.0 3.8 17th 156.8 94.2 very high 166%
Cape Otway Lighthouse 13.1 +0.1 15.8 21st 8.3 +0.9 4.1 8th 139.6 105.6 high 132%
Casterton 13.3   15.8 29th 5.3   −0.9 17th 125.2
Casterton Showgrounds 13.9 +0.5 17.0 20th 5.5 +0.6 −1.1 8th 139.4 85.9 very high 162%
Colac 11.7   17.4 21st 5.3   2.6 17th 59.4 55.8 average 106%
Dartmoor 13.7   16.2 19th 5.7   −0.2 23rd 159.2
Hamilton Airport 12.1 0.0 14.6 20th 5.0 +0.7 −0.6 17th 98.8 67.4 high 147%
Mortlake Racecourse 13.1 +0.2 16.6 20th 4.6 +0.1 −1.5 17th 69.6 62.0 average 112%
Port Fairy AWS 14.2 0.0 17.0 20th 7.0 0.0 1.1 8th 151.2 90.5 very high 167%
Portland 13.1 0.0 15.6 19th 6.3 +0.1 −1.5 8th 153.4 107.2 very high 143%
Warrnambool Airport NDB 13.4 −0.1 15.8 20th 5.8 +0.4 0.5 8th 121.0 79.6 high 152%
Weeaproinah 9.2 +0.3 12.1 21st 5.1 +0.5 2.8 24th 279.8 226.4 high 124%

 

You may wish to refer to the Table below for Melbourne average conditions prior to, and since the start of, the current decade.

The decline in rainfall may be explained in terms of a poleward retreat of rain-bearing mid-latitude depressions.

The rise in temperature is consistent with warming that has been observed in cities in other parts of the world.

The greater warming at night is due to the "heat island effect" (whereby major cities have been observed to have warmed more, especially at night, than their forested and grassed surroundings, on account of the roads, concrete, and buildings).

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

YEAR

Melbourne

Average

MIN (°C)

1855−1999

14.1

14.4

13.1

10.7

8.5

6.8

5.9

6.6

7.8

9.4

11.0

12.8

10.1

Melbourne

Average

MIN (°C)

Since 2000

16.1

16.5

14.7

12.1

9.8

8.3

7.5

7.9

9.6

10.9

13.1

14.4

11.8

Melbourne

Average

MAX (°C)

1855−1999

25.8

25.7

23.8

20.2

16.6

14.0

13.4

14.9

17.1

19.6

21.8

24.1

19.7

Melbourne

Average

MAX (°C)

Since 2000

27.0

26.8

25.0

21.5

17.8

15.3

14.6

16.0

18.6

20.6

23.2

25.3

21.0

Melbourne

Average

RAIN (MM)

1855−1999

48.7

47.6

51.2

57.9

57.3

50.1

48.2

50.5

59.0

67.3

59.9

59.6

657.0

Melbourne

Average

RAIN (MM)

Since 2000

30.7

42.7

35.6

49.1

36.6

34.1

39.8

45.4

40.3

47.6

53.4

52.7

519.2

 

Seasonal Climate Outlook

The outlook for August-October rainfall may be found at http://www.bom.gov.au/climate/ahead/rain.seaus.shtml

The outlook for August-October temperatures may be found at http://www.bom.gov.au/climate/ahead/temp.seaus.shtml

Long-Term Climate Averages

Long term climate averages may be found at http://www.bom.gov.au/climate/averages/


Notes

This statement has been prepared based on information available at 3 pm on Monday 3 August 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