Victoria in May 2011: Cold days

  • Average daytime temperatures much cooler than usual
  • Cold Night-times in the Northeast
  • Rainfall slightly below average in the north and slightly above average in the south.

Rainfall

Rainfall during May was mixed. Overall it was close to normal but there were patches of above average rainfall in the south and patches of bellow average rainfall in the north. Mount Baw Baw recorded the largest total for the month with 219.6 mm. Orbost was the only station to record its wettest May. The wettest single day was at Cabbage Tree Creek with 51.4 mm on the 3rd. There is a map of rainfall deciles below.

Temperature

Maximum temperature

Average daytime temperatures across the state have been very much cooler than usual. Many stations have recorded their lowest May mean daily maximum temperature on record. Average maximum temperatures were up to 2.4 C below normal. The coolest days on average were at Mount Hotham with 3.7 C. The coldest day was the 11th when Mount Hotham recorded -4.1 C,  a couple of stations recorded their coldest May day (lowest maximum temperature) on record. The hottest day was the 21st when Hopetoun Airport recorded 26.1 C . The warmest days on average were at Mildura Airport with 17.7 C. There is a map of maximum temperature anomalies below.

Minimum temperature

Average night-time temperatures were mixed. Some stations recorded their lowest May mean daily minimum temperature on record whilst others were warmer than average. The coolest anomalies were in parts of  the Northeast where some stations recorded average night-time temperatures up to 3 C cooler than usual. The coldest night was the 12th when Falls Creek recorded -6.7 C. A couple of station observed their lowest May temperature on record. The coolest nights on average were at Mount Hotham with -1.4 C. The warmest nights on average were at Wilsons Promontory Lighthouse with 11.1 C. The warmest night was at Cape Otway Lighthouse with 16.8 C on the 22nd. There is a map of minimum temperature anomalies below.

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Extremes in May 2011
Hottest day 26.1 C at Hopetoun Airport on the 21st
Warmest days on average 17.7 C at Mildura Airport
Coolest days on average 3.7 C at Mount Hotham
Coldest day -4.1 C at Mount Hotham on the 11th
Coldest night -6.7 C at Falls Creek on the 12th
Coolest nights on average -1.4 C at Mount Hotham
Warmest nights on average 11.1 C at Wilsons Promontory Lighthouse
Warmest night 16.8 C at Cape Otway Lighthouse on the 22nd
Warmest on average overall 13.4 C at Gabo Island Lighthouse
Coolest on average overall 1.1 C at Mount Hotham
Wettest overall 219.6 mm at Mount Baw Baw
Wettest day 51.4 mm at Cabbage Tree Creek on the 3rd
Highest wind gust 133 km/h at Wilsons Promontory Lighthouse on the 14th

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 lowest May daily maximum temperature
Lowest daily maximum
temperature
in May 2011 (C)
Previous coolest
for May
Years of
record
Average for
May
Willow Grove (Blue Rock Reservoir) 8.4 on the 11th 9.7 on the 29th in 2000 23 16.2
Falls Creek -3.0 on the 11th -2.7 on the 15th in 1993 20 6.2



Record lowest May mean daily maximum temperature
Mean daily maximum
temperature
for May 2011 (C)
Previous coolest
for May
Years of
record
Average for
May
Melbourne Airport 15.2 = 15.2 in 2006 40 16.6
Bundoora (Latrobe University) 15.2 15.4 in 1985 27 16.7
Morwell (Latrobe Valley Airport) 15.0 15.6 in 2006 27 16.9
Noojee (Slivar) 13.7 13.9 in 2006 26 15.3
Cranbourne Botanic Gardens 15.0 = 15.0 in 2006 21 16.4
Grovedale (Geelong Airport) 15.5 = 15.5 in 1995 21 17.1

Record lowest May temperature
Lowest temperature
in May 2011 (C)
Previous coolest
for May
Years of
record
Average for
May
Castlemaine Prison -2.6 on the 10th = -2.6 on the 16th in 1999 41 5.3
Edi Upper -0.8 on the 12th = -0.8 on the 30th in 2000 24 6.1



Record lowest May mean daily minimum temperature
Mean daily minimum
temperature
for May 2011 (C)
Previous coolest
for May
Years of
record
Average for
May
Mount Buller -0.9 = -0.9 in 2000 26 1.2
Edi Upper 3.6 4.3 in 2006 23 6.1


Summary statistics for May 2011
Maximum temperatures
for May
(C)
Minimum temperatures
for May
(C)
Rainfall
for May
(millimetres)
Mean for
May
2011
Diff
from
average
Highest for
May
2011
Mean for
May
2011
Diff
from
average
Lowest for
May
2011
Total for
May
2011
Average
for
May
Rank of
May
2011
Fraction of
May
average
Southwest Slopes (South) (district 72)
Albury Airport AWS 16.3 -1.4 22.3 2nd 3.9 -1.6 -0.7 15th 32.6 48.3 average 67%
Hume Reservoir 16.4 -0.3 22.5 22nd 5.4 -1.6 0.8 15th 35.8 58.7 average 61%
North Mallee (district 76)
Mildura Airport 17.7 -1.3 25.4 21st 6.4 -1.0 0.0 16th 13.2 25.4 average 52%
Ouyen (Post Office) 17.5 -1.3 24.5 21st 6.8 -0.4 0.6 17th 20.2 31.9 average 63%
Walpeup Research 17.6 -0.7 25.4 21st 7.0 -0.8 2.3 9th 19.0 31.0 average 61%
South Mallee (district 77)
Hopetoun Airport 17.6   26.1 21st 6.0   -2.3 10th 21.8
Swan Hill Aerodrome 17.4 -1.4 25.3 21st 5.7 -0.5 -0.2 16th 17.8 25.6 average 70%
North Wimmera (district 78)
Nhill Aerodrome 16.9   24.9 21st 6.4   0.6 10th 18.4
Warracknabeal Museum 16.8 -1.1 25.0 21st 6.4 -0.1 0.5 10th 28.2 40.1 average 70%
South Wimmera (district 79)
Edenhope Airport 15.3   23.1 21st 6.9   0.7 31st 37.4
Grampians (Mount William) 7.1   14.3 31st 2.4   -1.0 11th 124.4
Horsham Aerodrome 16.0 -1.7 24.3 21st 5.3 +0.3 -1.6 31st 23.2 31.3 average 74%
Horsham Polkemmet Rd 16.1 -1.1 24.0 21st 6.0 -0.2 -1.1 31st 23.8 46.3 low 51%
Kanagulk 14.8   23.1 21st 6.7   -0.3 31st 29.8
Longerenong 16.1 -1.0 24.8 21st 5.5 -0.4 -1.5 10th 22.8 42.8 low 53%
Pyrenees (Ben Nevis) 9.2   15.6 20th 4.3   -0.1 11th 80.4
Stawell Aerodrome 14.6 -1.9 22.2 21st 6.4 +0.4 -0.8 10th 22.0 36.0 average 61%
Lower North (district 80)
Charlton 16.9   24.6 21st 6.0   -0.8 10th 23.8
Echuca Aerodrome 16.4 -1.2 23.0 22nd 5.0 -1.6 -0.7 31st 24.8 40.8 average 61%
Kerang 17.1 -0.9 24.3 21st 6.0 -0.7 1.4 16th 12.2 36.2 low 34%
Kyabram DPI 16.5 -0.7 22.1 21st 5.2 -0.9 -1.1 31st 13.0 42.5 low 31%
Upper North (district 81)
Bendigo Airport 15.4 -1.2 20.2 1st 5.3 +0.1 -2.5 10th 15.6 46.7 low 33%
Shepparton Airport 16.1 -1.7 21.5 21st 4.7 -0.7 -0.6 31st 18.8 31.8 average 59%
Tatura Inst Sustainable Ag 16.1 -1.2 21.7 21st 4.7 -1.0 -0.8 10th 8.0 45.0 v low 18%
Yarrawonga 17.1 -1.1 23.1 22nd 4.5 -1.6 -0.4 10th 17.6 31.9 average 55%
Lower Northeast (district 82)
Benalla Airport 16.4   21.4 3rd 4.0   -0.9 12th 37.3
Corryong Airport 14.9   20.1 1st 0.9   -3.1 16th 52.6
Dartmouth Reservoir 14.7 -1.4 19.5 1st 3.5 -1.2 -1.2 15th 49.0 85.7 low 57%
Hunters Hill 11.3 -0.6 16.2 3rd 4.0 -1.6 -1.8 12th 79.2 85.2 average 93%
Rutherglen Research 16.4 -0.6 21.7 22nd 1.5 -2.8 -2.9 15th 30.6 51.3 average 60%
Strathbogie 13.1 -1.4 17.3 3rd 3.2 -0.4 -3.0 31st 44.6 96.2 low 46%
Wangaratta Aero 16.2 -1.4 21.8 22nd 2.5 -1.8 -2.7 10th 35.4 58.9 average 60%
Upper Northeast (district 83)
Dinner Plain (Mount Hotham Airport) 9.7 -1.2 14.9 19th -0.5 -1.4 -5.8 6th 46.0 35.0 average 131%
Edi Upper 15.5 -1.1 21.0 1st 3.6 -2.5 -0.8 12th 55.0 92.9 low 59%
Falls Creek 5.4 -0.8 10.8 2nd -0.9 -1.6 -6.7 12th 55.0 89.5 average 61%
Mount Buller 4.6 -1.8 9.5 6th -0.9 -2.1 -5.5 12th 98.0 131.9 average 74%
Mount Hotham 3.7 -1.0 8.7 31st -1.4 -1.4 -6.5 12th 73.4 120.2 average 61%
Omeo 12.5   17.7 1st 2.1   -2.9 12th 34.4
East Gippsland (district 84)
Combienbar AWS 12.1 -2.2 20.1 22nd 6.4 -1.3 2.2 14th 74.6 69.2 average 108%
Gabo Island Lighthouse 16.3 -0.6 20.7 22nd 10.4 -0.8 7.3 14th 108.6 100.0 average 109%
Gelantipy 10.6 -2.4 16.9 21st 4.0 -0.9 -0.9 6th 76.4 51.4 high 149%
Lakes Entrance (Eastern Beach Road) 16.2   23.5 21st 8.1   2.5 18th 64.7
Mallacoota 16.3 -1.2 22.2 22nd 9.0 -0.3 4.8 11th 115.2 85.9 high 134%
Mount Nowa Nowa 14.0 -1.9 21.0 21st 7.5 -1.2 4.2 12th 125.4 64.5 high 194%
Orbost 16.0 -1.7 23.5 22nd 8.2 -0.2 4.5 18th 122.2 58.2 v high 210%
Orbost (Comparison) 16.3 -1.5 23.4 22nd 7.4 +0.3 2.5 18th 116.9 70.3 high 166%
Point Hicks (Lighthouse) 15.8 -1.2 22.8 22nd 10.0 -1.1 4.0 14th 147.7 96.7 high 153%
West Gippsland (district 85)
Bairnsdale Airport 16.0 -1.5 23.0 21st 6.4 -0.3 0.8 18th 34.0 46.4 average 73%
East Sale Airport 15.7 -1.1 23.0 21st 6.3 0.0 1.1 10th 30.8 51.6 average 60%
Morwell (Latrobe Valley Airport) 15.0 -1.9 21.9 21st 6.4 -0.2 -0.3 10th 57.0 52.1 average 109%
Mount Baw Baw 4.4 -2.4 9.6 18th 0.1 -1.7 -4.2 11th 219.6 111.4 high 197%
Mount Moornapa 12.8 -1.9 20.6 21st 6.9 -1.0 3.3 14th 82.2 48.8 high 168%
Noojee (Slivar) 13.7 -1.6 20.2 21st 6.1 +0.4 1.0 10th 123.6 80.4 high 154%
Pound Creek 15.4   21.4 21st 7.1   1.0 31st 74.2
Wilsons Promontory Lighthouse 14.6 -0.3 21.1 21st 11.1 0.0 7.0 11th 81.6 112.6 average 72%
Yarram Airport 15.8   22.6 21st 6.2   0.5 10th 76.4
East Central (district 86)
Bundoora (Latrobe University) 15.2 -1.5 21.0 21st 7.8 -0.1 0.4 10th 74.8 51.1 high 146%
Cerberus 15.1 -1.5 21.1 21st 8.3 0.0 2.7 30th 93.8 63.9 high 147%
Coldstream 15.1 -1.4 21.2 21st 5.5 +0.1 -1.0 10th 112.8 63.6 high 177%
Coldstream Comparison 15.0   21.1 21st 5.4   -1.0 10th 112.8
Cranbourne Botanic Gardens 15.0 -1.4 21.0 21st 8.2 -0.2 3.9 10th 68.6 62.5 average 110%
Essendon Airport 15.2 -1.0 20.0 21st 8.3 +0.6 1.0 10th 46.0 49.1 average 94%
Ferny Creek 11.1   17.3 1st 6.7   1.9 12th 174.8
Ferny Creek (Dunns Hill) 10.5 -1.9 17.0 21st 6.4 -1.2 1.6 12th 160.2 89.9 high 178%
Frankston AWS 14.7 -1.3 20.1 21st 10.1 -0.4 6.2 10th
Melbourne Airport 15.2 -1.4 20.2 21st 7.7 -0.6 2.3 10th 44.8 40.1 average 112%
Melbourne Regional Office 16.3 -0.4 21.3 21st 9.6 +1.0 3.5 10th 68.4 55.8 high 123%
Moorabbin Airport 15.4 -1.6 21.8 21st 8.7 +0.1 1.8 10th 77.6 70.2 average 111%
Rhyll 15.0 -1.2 19.0 2nd 10.2 -0.5 6.7 11th 87.0 66.5 average 131%
Scoresby Research Institute 15.0 -1.3 20.9 21st 7.7 -0.5 0.8 10th 83.8 88.5 average 95%
Viewbank (ARPANSA) 15.4 -1.8 21.4 21st 7.4 -0.3 -0.3 10th 73.0 51.3 high 142%
Wallan (Kilmore Gap) 11.2 -1.6 16.8 1st 5.9 -1.0 2.4 11th 84.2 59.1 high 142%
Wonthaggi 15.2 -1.5 21.0 21st 8.1 -0.5 3.8 31st 102.8 96.9 average 106%
West Central (district 87)
Avalon Airport 15.7 -1.4 24.3 21st 7.3 -0.2 1.2 31st 23.6 34.7 average 68%
Grovedale (Geelong Airport) 15.5 -1.6 23.5 21st 7.4 -0.4 2.7 18th 47.6 46.5 average 102%
Laverton RAAF 15.5 -1.3 21.4 21st 7.7 -0.1 2.2 10th 49.4 46.6 average 106%
Sheoaks 13.8 -1.7 20.2 21st 6.5 -0.8 0.2 10th 42.4 31.5 high 135%
North Central (district 88)
Castlemaine Prison 14.0 -1.8 19.3 21st 4.9 -0.4 -2.6 10th 42.4 57.4 average 74%
Eildon Fire Tower 11.5 -1.9 16.5 1st 5.4 -1.3 0.6 12th 77.8 56.9 average 137%
Lake Eildon 14.6 -1.6 19.8 3rd 4.8 -1.2 -0.5 10th 72.8 78.7 average 93%
Mangalore Airport 15.4 -1.3 19.7 21st 5.2 -0.9 -1.6 12th 39.0 55.0 average 71%
Maryborough 14.8 -1.4 20.5 21st 6.0 -0.1 0.6 10th 31.9 49.2 average 65%
Redesdale 14.8 -1.2 20.9 1st 4.7 -0.5 -0.7 31st 20.2 56.3 low 36%
Western Plains (district 89)
Ararat Prison 13.9 -1.5 19.8 21st 5.7 +0.3 -1.6 10th 44.4 52.7 average 84%
Ballarat Aerodrome 12.3 -1.3 17.2 20th 5.4 -0.3 -2.9 10th 65.4 64.8 average 101%
Westmere 13.7   19.7 21st 6.0   -1.7 10th 53.4
West Coast (district 90)
Aireys Inlet 14.7 -1.5 23.3 21st 9.3 -0.6 5.3 11th 44.6 47.2 average 94%
Cape Nelson Lighthouse 15.1 -0.9 21.7 20th 10.2 -0.6 5.6 31st 68.4 65.2 average 105%
Cape Otway Lighthouse 14.7 -0.9 21.6 21st 10.1 +0.1 6.7 29th 72.0 90.4 average 80%
Casterton 14.5   21.4 21st 6.7   -0.3 31st 69.6
Colac (Mount Gellibrand) 13.2 -2.0 20.5 21st 6.7 -1.3 2.6 10th 37.6 36.3 average 104%
Dartmoor 14.9   20.2 21st 7.7   -0.5 31st 99.8
Hamilton Airport 13.8 -1.9 20.1 21st 6.2 -0.3 0.7 31st 44.8 48.4 average 93%
Mortlake Racecourse 14.4 -1.8 20.5 21st 6.1 -0.4 0.4 31st 66.2 47.9 high 138%
Port Fairy AWS 15.3 -1.5 21.5 20th 9.1 +0.1 2.0 31st 81.8 61.2 high 134%
Portland (Cashmore Airport) 14.7 -1.2 20.3 21st 8.5 +0.2 3.9 18th 91.6 76.8 average 119%
Portland NTC AWS 14.7   19.3 21st 10.0   4.1 31st
Warrnambool Airport NDB 14.7 -2.0 20.5 20th 7.4 +0.2 0.9 31st 83.8 63.7 high 132%
Weeaproinah 10.7 -1.4 15.8 21st 6.3 -1.0 2.9 10th 198.2 197.1 average 101%

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 10 am on Wednesday 1 June 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