Victoria in September 2011: Warm days

  • Average maximum temperatures very much warmer than normal in the west
  • Average minimum temperatures close to normal for most of the state
  • Rainfall totals close to normal.

Rainfall

Preliminary rainfall data indicates that the widespread rain in the last days of the month helped deliver monthly totals that were close to normal for September. However, rainfall for these days in western and southerns districts was not quite as substantial as other parts of the state. Parts of the Wimmera and South West forecast districts have been drier than normal. The wettest station overall was Mount Baw Baw with 227.4 mm. The wettest single day was the 29th when Tolmie (Mount Tabletop Repeater) recorded 101.0 mm. Some sites had their highest September daily rainfall on record. There is a map of rainfall deciles below.

Temperature

Maximum temperature

Average maximum temperatures have been warmer than usual during September. Average daytime temperatures were very much warmer than normal in the Mallee, Wimmera, Central and South West forecast districts. Elsewhere, average maximum temperatures were warmer than normal except for East Gippsland where they close to average. The hottest day was the 17th when Hopetoun Airport recorded 33.4 C and the warmest days on average were recorded at Mildura Airport with 22.7 C. The coolest days on average were recorded at Mount Hotham with 4.0 C, along with the single coldest day with -3.5 C on the 9th. Some sites had their highest September temperature on record. There is a map of maximum temperature anomalies below.

Minimum temperature

Average minimum temperatures have been close to normal for September. Parts of the South West forecast district recorded warmer than usual average minimum temperatures whilst in parts of the Mallee they were cooler than usual. Overall, most stations recorded average minimum temperatures that were within a degree of their long-term average. The coldest night was the 12th when Mount Hotham recorded -7.9 C and Mount Hotham also recorded the coldest nights on average with -1.8 C. The warmest nights on average were recorded at Gabo Island Lighthouse with 10.3 C and the warmest night was the 4th when Moorabbin Airport recorded 16.7 C. There is a map of minimum temperature anomalies below.

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Extremes in September 2011
Hottest day 33.4 C at Hopetoun Airport on the 17th
Warmest days on average 22.7 C at Mildura Airport
Coolest days on average 4.0 C at Mount Hotham
Coldest day -3.5 C at Mount Hotham on the 9th
Coldest night -7.9 C at Mount Hotham on the 12th
Coolest nights on average -1.8 C at Mount Hotham
Warmest nights on average 10.3 C at Gabo Island Lighthouse
Warmest night 16.7 C at Moorabbin Airport on the 4th
Warmest on average overall 14.6 C at Melbourne Regional Office
Coolest on average overall 1.1 C at Mount Hotham
Wettest overall 227.4 mm at Mount Baw Baw
Wettest day 101.0 mm at Tolmie (Mount Tabletop Repeater) on the 29th
Highest wind gust 135 km/h at Mount Hotham on the 19th

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


Record highest September daily rainfall
Highest daily rainfall
in September 2011 (mm)
Previous wettest
for September
Years of
record
Tatura Inst Sustainable Ag 41.4 on the 29th 33.8 on the 23rd in 1955 70
Kyabram DPI 41.4 on the 29th 24.4 on the 11th in 1964 48
Eppalock Reservoir 56.0 on the 29th 38.2 on the 8th in 2004 47
Kyneton 56.0 on the 29th 49.0 on the 4th in 2010 43
Melbourne Airport 51.6 on the 29th 38.0 on the 15th in 1993 42
Warrenbayne 67.2 on the 29th 54.8 on the 4th in 2010 30
Strath Creek 51.6 on the 29th 42.6 on the 4th in 2010 29

Record highest September temperature
Highest temperature
in September 2011 (C)
Previous warmest
for September
Years of
record
Average for
September
Phillip Island Penguin Reserve 27.8 on the 19th 27.6 on the 26th in 1987 26 16.0
Willow Grove (Blue Rock Reservoir) 26.5 on the 19th = 26.5 on the 12th in 2009 22 16.1
Cerberus 28.9 on the 19th 28.3 on the 19th in 2006 20 16.2
Frankston AWS 27.6 on the 19th 27.4 on the 30th in 2001 20 15.4
Rhyll 25.1 on the 19th 24.9 on the 19th in 2006 20 15.9

Summary statistics for September 2011
Maximum temperatures
for September
(C)
Minimum temperatures
for September
(C)
Rainfall
for September
(millimetres)
Mean for
September
2011
Diff
from
average
Highest for
September
2011
Mean for
September
2011
Diff
from
average
Lowest for
September
2011
Total for
September
2011
Average
for
September
Rank of
September
2011
Fraction of
September
average
Southwest Slopes (South) (district 72)
Albury Airport AWS 18.7 +0.8 26.7 19th 5.0 -0.7 -0.1 7th 52.2 59.1 average 88%
Hume Reservoir 18.5 +1.2 26.4 19th 6.2 -0.5 -0.5 12th 51.5 62.1 average 83%
North Mallee (district 76)
Mildura Airport 22.7 +2.3 33.2 17th 6.3 -1.1 0.2 7th 7.0 27.1 low 26%
Ouyen (Post Office) 21.7 +1.5 32.6 17th 6.5 -0.2 2.0 7th 21.8 32.6 average 67%
Walpeup Research 21.7 +2.2 32.9 17th 6.5 -0.4 0.1 25th 14.0 31.5 low 44%
South Mallee (district 77)
Hopetoun Airport 21.2 33.4 17th 4.3 -3.1 12th 18.0
Swan Hill Aerodrome 21.3 +1.2 31.7 19th 4.9 -1.1 -1.6 12th 13.6 25.6 low 53%
North Wimmera (district 78)
Nhill Aerodrome 19.6 29.9 17th 5.6 -0.2 25th 19.6
Warracknabeal Museum 20.0 +2.0 30.6 19th 5.5 -0.4 0.4 15th 8.8 41.6 lowest 21%
South Wimmera (district 79)
Edenhope Airport 17.8 26.2 22nd 6.8 0.9 25th 36.8
Grampians (Mount William) 9.1 18.5 19th 2.1 -1.6 12th 68.0
Horsham Aerodrome 19.0 +1.0 29.5 19th 3.9 -0.5 -2.5 25th 10.4 37.1 v low 28%
Horsham Polkemmet Rd 19.3 +1.7 29.4 19th 4.6 -0.9 -1.5 15th 19.6 46.0 low 43%
Kanagulk 17.3 26.5 17th 6.2 1.4 15th 15.4
Longerenong 18.6 +1.3 27.7 19th 4.5 -0.6 -1.4 15th 12.8 40.5 low 32%
Pyrenees (Ben Nevis) 12.5 22.4 19th 4.3 0.4 7th 30.8
Stawell Aerodrome 17.5 +0.9 28.3 19th 6.1 +0.2 0.5 15th 12.6 54.0 v low 23%
Lower North (district 80)
Charlton 19.7 30.6 19th 5.2 -1.1 12th 24.4
Echuca Aerodrome 20.1 +1.8 32.2 19th 5.5 -0.8 -0.1 8th 25.2 39.1 average 64%
Kerang 21.1 +2.0 31.8 19th 6.7 0.0 1.8 7th 29.6 35.6 average 83%
Kyabram DPI 19.4 +2.0 30.8 19th 5.3 +0.1 -1.2 8th 50.4 43.0 average 117%
Upper North (district 81)
Bendigo Airport 18.3 +1.6 29.6 19th 4.7 +0.4 -2.6 12th 50.0 51.0 average 98%
Shepparton Airport 18.8 +0.7 29.7 19th 5.0 -0.3 -0.8 8th 40.8 40.0 average 102%
Tatura Inst Sustainable Ag 18.8 +1.4 29.5 19th 5.0 -0.4 -1.3 7th 48.6 43.9 average 111%
Yarrawonga 19.3 +0.9 30.7 19th 4.7 -0.4 -2.1 12th 37.6 43.3 average 87%
Lower Northeast (district 82)
Benalla Airport 18.3 26.3 19th 4.3 -1.9 12th 45.2
Corryong Airport 17.2 25.4 19th 2.5 -2.1 8th 98.6
Dartmouth Reservoir 16.6 +0.1 25.8 19th 4.2 -0.3 -1.7 12th 74.6 105.6 average 71%
Hunters Hill 12.7 +0.7 21.1 19th 4.4 -0.1 -1.4 10th 108.8 127.2 average 86%
Rutherglen Research 18.1 +0.9 26.3 19th 3.2 -1.0 -4.0 12th 54.4 54.6 average 100%
Strathbogie 15.1 +0.9 23.0 19th 3.1 -0.6 -4.1 8th 88.4 96.1 average 92%
Wangaratta Aero 18.4 +1.0 26.8 19th 3.7 -0.9 -2.5 12th 46.8 56.3 average 83%
Upper Northeast (district 83)
Dinner Plain (Mount Hotham Airport) 11.5 +0.4 19.4 19th 0.5 -0.1 -6.5 12th 83.6 84.1 average 99%
Edi Upper 17.1 +1.0 25.4 19th 4.6 -0.8 -1.2 12th 60.2 105.8 low 57%
Falls Creek 5.6 +0.9 13.5 18th -0.8 +0.2 -7.0 12th 111.6 126.6 average 88%
Mount Buller 5.0 +0.2 13.6 19th -0.9 -0.2 -6.6 12th 123.0 150.0 average 82%
Mount Hotham 4.0 +0.6 12.2 19th -1.8 -0.2 -7.9 12th 149.4 135.3 average 110%
Omeo 15.5 23.0 19th 2.3 -4.4 12th 55.2
East Gippsland (district 84)
Combienbar AWS 16.1 +0.5 26.4 19th 6.5 +0.2 1.9 12th 60.4 67.5 average 89%
Gabo Island Lighthouse 16.5 +0.6 21.6 14th 10.3 +0.6 7.0 10th 27.6 72.2 low 38%
Gelantipy 13.8 +0.1 23.0 19th 4.0 -0.3 -0.7 13th 44.2 56.0 average 79%
Lakes Entrance (Eastern Beach Road) 18.5 28.7 19th 8.0 2.1 3rd 49.2
Mallacoota 17.9 +0.5 22.8 6th 8.6 +0.5 4.6 7th 52.6 80.7 low 65%
Mount Nowa Nowa 17.5 +0.6 28.2 19th 7.8 0.0 3.7 9th 63.0 57.7 average 109%
Orbost 18.6 +0.4 29.5 19th 7.7 +0.2 4.4 3rd 36.6 54.6 average 67%
Orbost (Comparison) 18.6 +0.8 24.9 22nd 6.6 +0.3 2.3 3rd 40.0 70.9 low 56%
Point Hicks (Lighthouse) 17.7 +1.2 24.6 19th 10.0 +0.5 4.5 30th 60.3 75.7 average 80%
West Gippsland (district 85)
Bairnsdale Airport 18.7 +1.2 26.3 19th 5.4 -0.4 0.2 26th 42.4 53.4 average 79%
East Sale Airport 18.2 +1.2 26.4 19th 5.3 -0.3 -0.1 3rd 55.6 51.7 average 108%
Morwell (Latrobe Valley Airport) 18.1 +1.3 27.2 19th 5.8 0.0 -1.0 8th 70.0 77.2 average 91%
Mount Baw Baw 5.5 0.0 14.7 19th -0.6 -0.4 -5.9 12th 227.4 144.6 high 157%
Mount Moornapa 16.6 +0.5 27.7 19th 7.0 +0.2 2.8 12th 55.0 52.7 average 104%
Noojee (Slivar) 16.4 +1.1 26.2 19th 5.9 +0.8 1.3 8th 139.8 126.1 average 111%
Pound Creek 17.1 27.5 19th 7.5 2.6 25th 61.0
Willow Grove (Blue Rock Reservoir) 17.2 +1.1 26.5 19th 6.9 +0.7 4.3 24th 88.9 79.4 high 112%
Wilsons Promontory Lighthouse 15.6 +1.4 24.9 19th 10.1 +1.1 6.9 7th 71.4 98.5 low 72%
Yarram Airport 17.9 24.8 28th 6.1 -1.0 8th 45.4
East Central (district 86)
Bundoora (Latrobe University) 18.4 +1.6 27.0 19th 7.6 +0.4 1.9 8th 69.8 59.2 average 118%
Cerberus 17.7 +1.5 28.9 19th 7.5 0.0 0.8 8th 57.4 66.1 average 87%
Coldstream 17.9 +0.8 26.7 19th 5.7 +0.2 0.3 15th 103.2 71.5 high 144%
Coldstream Comparison 17.9 26.7 19th 5.6 0.3 15th 102.8
Cranbourne Botanic Gardens 17.7 +1.4 27.6 19th 7.6 -0.1 3.3 2nd 71.5 85.3 average 84%
Essendon Airport 18.7 +2.1 27.7 19th 7.6 +1.0 1.6 8th 71.0 51.1 high 139%
Ferny Creek 14.4 23.0 19th 6.9 2.3 7th 124.4
Frankston AWS 16.7 +1.3 27.6 19th 10.1 +0.8 6.0 2nd
Melbourne Airport 18.4 +1.9 27.1 19th 7.2 +0.2 2.6 8th 76.0 46.9 high 162%
Melbourne Regional Office 19.4 +2.2 28.3 19th 9.8 +1.8 5.4 8th 73.6 58.1 high 127%
Moorabbin Airport 18.3 +1.5 28.4 19th 8.6 +0.7 3.5 26th 80.4 65.9 average 122%
Rhyll 16.8 +0.9 25.1 19th 9.9 +0.6 7.0 8th 53.2 66.4 average 80%
Scoresby Research Institute 18.0 +1.6 27.1 19th 7.5 0.0 2.5 8th 91.4 84.7 average 108%
Viewbank (ARPANSA) 18.5 +0.9 27.9 19th 7.9 +0.2 1.8 15th 82.6 56.1 high 147%
Wallan (Kilmore Gap) 13.8 +0.8 22.1 19th 5.6 +0.1 0.5 7th 90.6 58.8 average 154%
Wonthaggi 17.8 +1.8 28.5 19th 8.2 +0.6 3.5 8th 66.0 89.1 low 74%
West Central (district 87)
Avalon Airport 18.9 +1.3 29.2 19th 6.6 0.0 0.8 8th 39.8 45.9 average 87%
Breakwater (Geelong Racecourse) 18.6 28.8 19th 8.0 2.3 8th 34.0
Laverton RAAF 18.7 +1.8 27.8 19th 7.1 +0.5 1.6 8th 42.8 49.5 average 86%
Sheoaks 16.8 +1.5 26.5 19th 6.1 0.0 0.8 8th 38.8 49.1 average 79%
North Central (district 88)
Castlemaine Prison 16.7 +1.1 27.4 19th 4.5 -0.4 -2.1 12th 59.0 61.1 average 97%
Eildon Fire Tower 14.1 +0.7 22.2 19th 6.0 +0.3 1.7 8th 50.6 65.3 average 77%
Lake Eildon 17.7 +1.2 25.9 19th 5.5 0.0 -0.8 12th 84.4 82.4 average 102%
Mangalore Airport 18.2 +1.5 27.2 19th 5.1 -0.2 -1.8 7th 45.4 55.8 average 81%
Maryborough 18.2 +1.5 28.4 19th 5.5 +0.1 -0.2 15th 33.7 51.9 average 65%
Redesdale 17.7 +1.7 27.1 19th 3.8 -0.4 -2.6 12th 49.6 53.9 average 92%
Western Plains (district 89)
Ararat Prison 17.1 +2.1 27.2 19th 5.5 +0.5 -1.6 15th 15.6 61.4 lowest 25%
Ballarat Aerodrome 15.0 +1.2 25.4 19th 4.3 -0.5 -2.1 15th 54.8 71.9 average 76%
Westmere 16.3 26.8 19th 5.0 -0.7 8th 29.0
West Coast (district 90)
Aireys Inlet 17.3 +1.3 28.1 19th 8.7 +0.7 4.6 8th 33.4 58.2 v low 57%
Cape Nelson Lighthouse 16.9 +1.2 26.9 19th 9.7 +0.3 4.2 8th 47.6 76.0 v low 63%
Cape Otway Lighthouse 16.4 +1.2 26.9 19th 9.7 +1.2 5.5 8th 67.2 90.1 low 75%
Casterton 16.8 24.9 22nd 6.3 -0.4 8th 57.6
Colac (Mount Gellibrand) 15.9 +1.7 25.5 19th 6.8 +0.6 2.6 8th 23.4 49.1 v low 48%
Dartmoor 17.0 25.2 19th 6.9 -0.4 8th 55.2
Hamilton Airport 16.4 +1.3 25.1 19th 5.8 0.0 0.6 7th 27.4 68.9 v low 40%
Mortlake Racecourse 16.9 +1.4 25.8 19th 5.7 +0.2 0.1 8th 43.6 57.3 low 76%
Port Fairy AWS 17.2 +0.7 27.1 19th 8.7 +0.5 3.5 8th 59.2 70.1 low 84%
Portland (Cashmore Airport) 16.4 +1.3 25.4 19th 7.5 0.0 2.4 8th 63.8 87.3 low 73%
Portland NTC AWS 16.1 25.2 19th 9.5 4.5 8th
Warrnambool Airport NDB 16.7 +0.8 26.1 19th 7.3 +0.7 1.3 8th 44.8 70.9 v low 63%
Weeaproinah 12.7 +1.2 22.0 19th 6.2 +0.7 2.5 8th 176.0 199.9 average 88%

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 8 am on Monday 3 October 2011. 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