Friday, 1 May 2009 - Monthly Climate Summary for Victoria - Product code IDCKGC26R0

Victoria in April 2009
Month ends with an icy blast.

Summary

(please note: for a verbal briefing, you may go to the Registered User Site accessible at http://www.bom.gov.au/general/reg/vwcs/media.shtml and log in as bomg0010 with the password media)

After fairly normal weather for most of April, the last few days of the month saw Victoria, and also much of southeastern Australia, hit by an icy blast (accompanied by severe winds at many localities, and a tornado close to Robinvale on the 25th). This was followed by the State's all-time record low temperature for April (−6.9 deg C at Hotham Heights) broken during the night of 28/29 April, when −8.2 deg C was recorded at Mount Hotham. The month concluded with a thick layer of snow covering the ranges. Rainfall totals for April were mostly close to normal, although much of this precipitation occurred during the last few days. In Melbourne, the temperature failed to reach 15 deg C on the four consecutive days between 26 April and 29 April, the first time since April 1949that this has happened. the overnight minimum temperature at Melbourne on the 30th was 2.9 deg C, the lowest April reading since 1957.

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

Details

Some sites had their highest total 1 April to 30 April rainfall on record. Other sites had their coldest 1 April to 30 April day (lowest maximum temperature) on record.  Some sites had their lowest 1 April to 30 April temperature on record. Other sites had their warmest 1 April to 30 April night (highest daily minimum temperature) on record.

Hottest day
Highest temperature
33.3°C at Dartmoor on the 2nd
Warmest days on average
Highest mean daily maximum temperature
23.6°C at Mildura Airport
Coolest days on average
Lowest mean daily maximum temperature
7.3°C at Mount Hotham
Coldest day
Lowest daily maximum temperature
−2.8°C at Mount Hotham on the 26th
Coldest night
Lowest temperature
−8.2°C at Mount Hotham on the 29th
Coolest nights on average
Lowest mean daily minimum temperature
1.1°C at Mount Hotham
Warmest nights on average
Highest mean daily minimum temperature
13.8°C at Gabo Island Lighthouse
Warmest night
Highest daily minimum temperature
21.7°C at Melbourne Airport on the 3rd
Wettest overall
Highest total rainfall
189.4 mm at Mount Baw Baw
Driest overall
Lowest total rainfall
n/a
Wettest day
Highest daily rainfall
70.9 mm at Koroit on the 30th
Highest wind gust
159 km/h at Wilsons Promontory Lighthouse on the 15th

Synoptic Patterns

The month began with a high over the South Tasman Sea directing warm northeasterlies across the State. Following this, there was the passage of a series of weak fronts, which was then followed by a new high moving across Victoria; this second high then intensified as it advanced over the Tasman Sea region. About mid-month the synoptic patterns began to alter, with increasing strength being shown in the westerly flow to the south of the continent. This period of westerly flow then temporarily came to an abrupt halt, as a new high developed and intensified over Tasmania. This high then drifted eastwards towards New Zealand, thereby allowing a major low pressure trough to amplify over southeastern Australia. It was this trough that brought the low temperatures to much of southeastern Australia and snowfalls to the ranges down to low levels.


Records

Record highest total 1 April to 30 April rainfall
Total rainfall
for 1 April to 30 April 2009 (mm)
Previous highest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Koroit 149.0 148.6 in 1892 111 64.8


Record lowest 1 April to 30 April daily maximum temperature
Lowest daily maximum
temperature
in 1 April to 30 April 2009 (°C)
Previous lowest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Wilsons Promontory Lighthouse 11.3 on the 28th 11.5 on the 5th in 1983 53 17.3
Point Hicks (Lighthouse) 12.5 on the 28th 12.7 on the 27th in 1982 43 19.7
Wonthaggi 12.0 on the 26th 12.4 on the 17th in 1985 41 19.6
Dartmouth Reservoir 9.0 on the 26th = 9.0 on the 7th in 1995 35 20.8
Portland (Cashmore Airport) 10.9 on the 27th 12.2 on the 26th in 2008 27 18.4



Record highest 1 April to 30 April daily minimum temperature
Highest daily minimum
temperature
in 1 April to 30 April 2009 (°C)
Previous highest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Gabo Island Lighthouse 19.4 on the 3rd 19.2 on the 5th in 1981 51 13.8
Melbourne Airport 21.7 on the 3rd 21.1 on the 10th in 2005 39 10.1



Record lowest 1 April to 30 April temperature
Lowest temperature
in 1 April to 30 April 2009 (°C)
Previous lowest
for 1 April to 30 April
Years of
record
Average for
1 April to 30 April
Laverton RAAF 0.3 on the 30th 0.4 on the 25th in 1999 65 9.9
Echuca Aerodrome 0.4 on the 30th 0.6 on the 26th in 1981 52 9.2
Kerang 0.8 on the 30th 2.1 on the 16th in 2006 45 9.8
Essendon Airport 0.6 on the 30th 2.6 on the 15th in 1963 40 9.7
Scoresby Research Institute 0.3 on the 30th 1.1 on the 24th in 1966 40 10.1
Melbourne Airport 1.2 on the 30th 1.3 on the 23rd in 1999 39 10.1
Bundoora (Latrobe University) −0.1 on the 30th 0.4 on the 25th in 1999 30 9.7
Noojee (Slivar) −0.6 on the 30th −0.4 on the 25th in 1999 28 7.4

Mount Buller

Mount Hotham

−6.9

−8.2

on the 29th

−5.6

−6.9

on the 7th in 1995

n/a

22

n/a

3.3

--




Summaries

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

Summary statistics for 1 April to 30 April 2009
Maximum temperatures
for 1 April to 30 April
(°C)
Minimum temperatures
for 1 April to 30 April
(°C)
Rainfall
for 1 April to 30 April
(millimetres)
Mean for
1 April to 30 April
2009
Diff
from
average
Highest for
1 April to 30 April
2009
Mean for
1 April to 30 April
2009
Diff
from
average
Lowest for
1 April to 30 April
2009
Total for
1 April to 30 April
2009
Average
for
1 April to 30 April
Rank of
1 April to 30 April
2009
Fraction of
1 April to 30 April
average
North Mallee (district 76)
Mildura Airport 23.6 +0.1 33.2 2nd 9.6 −0.5 3.2 30th 20.4 18.3 high 111%
Ouyen 23.4 −0.3 33.2 2nd 9.5 −0.2 2.8 30th 24.5 21.6 average 113%
Walpeup Research 23.1 −0.2 33.1 2nd 9.8 −0.5 4.6 6th 31.2 22.7 high 137%
South Mallee (district 77)
Hopetoun Airport 23.0   32.9 2nd 7.9   0.5 30th 36.4
Swan Hill Aerodrome 23.0 −0.9 32.2 2nd 8.9 +0.3 1.2 30th 25.0 12.9 high 194%
North Wimmera (district 78)
Nhill Aerodrome 22.1   33.1 2nd 8.3   2.0 30th 23.6
Warracknabeal Museum 22.2 −0.3 32.0 2nd 8.5 −0.4 0.4 30th 24.0 26.7 average 90%
South Wimmera (district 79)
Edenhope Airport 20.6   32.6 2nd 8.3   2.1 30th 27.8
Grampians 11.6   22.9 1st 5.6   −0.4 26th 75.8
Horsham Aerodrome 21.6 −0.7 31.7 2nd 6.3 −0.4 −1.1 30th 22.0 27.5 average 80%
Horsham Polkemmet Rd 21.8 0.0 32.5 2nd 7.1 −1.2 0.0 30th 27.2 31.4 average 87%
Kanagulk 20.5   31.6 2nd 7.4   −0.1 30th 26.2
Longerenong 21.6 −0.1 31.7 2nd 6.9 −1.4 −1.2 30th 20.2 28.6 average 71%
Pyrenees 15.0   25.8 2nd 7.9   1.4 28th 48.8
Stawell Aerodrome 20.2 −0.5 30.5 2nd 7.9 −0.2 −0.1 30th 29.6
Lower North (district 80)
Charlton 22.2   31.7 2nd 8.4   0.5 30th 20.0
Echuca Aerodrome 22.8 +0.2 32.0 2nd 8.6 −0.5 0.4 30th 20.6 32.7 average 63%
Kerang 23.1 0.0 32.0 2nd 9.0 −0.8 0.8 30th 27.2 25.2 average 108%
Kyabram DPI 22.2 +0.5 31.5 2nd 8.7 0.0 0.9 30th 36.6 36.3 average 101%
Upper North (district 81)
Bendigo Airport 21.4 +0.2 30.6 2nd 7.6 +0.1 −1.3 30th 22.6 25.8 average 88%
Shepparton Airport 22.2 −0.4 31.5 2nd 8.0 0.0 0.4 30th 29.4 35.0 average 84%
Tatura Inst Sustainable Ag 21.8 +0.2 31.2 2nd 7.5 −0.7 −0.5 30th 30.6 34.0 average 90%
Yarrawonga 22.5 0.0 32.0 2nd 9.0 +0.5 1.3 30th 22.4 28.7 average 78%
Lower Northeast (district 82)
Beechworth Woolshed 21.2 −0.7 31.1 2nd 6.2 −0.3 −1.3 30th 61.0 45.3 high 135%
Benalla Airport 22.1   31.7 2nd 7.7   0.5 16th 47.6
Corryong Airport 21.4   30.3 2nd 6.4   1.3 30th 80.4
Dartmouth Reservoir 20.5 −0.2 30.5 2nd 7.5 +0.3 0.6 16th 109.8 57.5 high 191%
Hunters Hill 16.1 −0.5 26.2 2nd 8.0 −0.4 1.4 27th 123.0 70.1 high 175%
Rutherglen Research 21.7 −0.2 31.5 2nd 7.9 +0.9 0.0 30th 49.2 40.5 high 121%
Strathbogie 18.8 −0.2 28.5 2nd 5.0 −0.6 −1.4 16th 56.8 61.5 average 92%
Wangaratta Aero 22.0 −0.5 31.4 2nd 6.4 −0.3 −0.4 16th 40.2 43.9 average 92%
Upper Northeast (district 83)
Dinner Plain 13.6   23.7 2nd 2.2   −5.2 29th 40.2
Edi Upper 20.4 −0.6 30.6 3rd 6.9 −1.3 1.0 30th 97.0 61.8 high 157%
Falls Creek 8.9 −0.6 19.1 1st 2.2 −0.6 −6.9 29th 148.2
Mount Buller 8.8 −1.0 18.1 2nd 2.4 −0.9 −6.9 29th 139.8 126.8 average 110%
Mount Hotham 7.3 −1.0 17.0 2nd 1.1 −1.4 −8.2 29th 146.8
Omeo 18.4   28.4 2nd 4.7   −3.0 30th 38.8
Omeo Comparison 18.3 0.0 28.6 2nd 4.6 −0.1 −2.7 30th 40.2 45.2 average 89%
East Gippsland (district 84)
Combienbar AWS 17.7 +0.1 28.3 2nd 9.2 −0.6 2.7 29th 50.6 88.2 low 57%
Gabo Island Lighthouse 19.3 +0.1 25.5 15th 13.8 0.0 7.4 29th 86.2 84.2 average 102%
Gelantipy 16.2 0.0 26.0 2nd 7.0 +0.2 −0.5 29th 47.8 64.1 average 75%
Lakes Entrance 20.1   29.7 2nd 10.7   5.4 30th 75.2
Mallacoota 19.6 −0.6 26.5 3rd 11.8 +0.2 5.7 28th 86.4 98.0 average 88%
Mount Nowa Nowa 19.5 +0.4 29.3 2nd 10.6 +0.1 3.8 29th 40.6 83.9 low 48%
Orbost 21.0   31.1 2nd 10.3   2.9 30th 46.0
Orbost 21.5 +0.2 31.9 2nd 9.5 −0.1 2.2 30th 22.4 73.9 low 30%
Point Hicks 19.7 0.0 28.0 2nd 12.1 −1.0 6.5 29th 108.4 85.3 high 127%
West Gippsland (district 85)
Bairnsdale Airport 21.0 +0.4 31.1 3rd 8.2 −0.4 0.9 30th 29.8 56.7 low 53%
East Sale Airport 20.4 +0.2 30.0 2nd 7.6 −1.0 0.8 30th 39.6 49.2 average 80%
Morwell 20.6 +0.1 32.7 2nd 8.5 0.0 −0.2 30th 65.6 57.3 average 114%
Mount Baw Baw 9.0   19.0 2nd 3.1   −5.7 29th 189.4
Mount Moornapa 18.8 +0.7 29.2 2nd 9.7 −0.3 3.2 29th 14.6
Noojee 18.8 0.0 31.0 2nd 7.0 −0.4 −0.6 30th 95.0 86.2 average 110%
Pound Creek 19.8   31.5 2nd 8.8   −0.3 30th 90.2
Wilsons Promontory Lighthouse 16.9 −0.4 26.6 2nd 12.9 −0.2 6.0 28th 125.0 85.3 high 147%
Yarram Airport 20.0   29.2 2nd 8.6   2.4 30th 59.0
East Central (district 86)
Bundoora 20.4 0.0 33.0 2nd 9.5 −0.2 −0.1 30th 49.6 54.1 average 92%
Cerberus 19.4 −0.5 31.4 2nd 9.6 −0.2 −0.3 30th 91.2 62.1 high 147%
Coldstream 20.2 −0.7 31.7 2nd 6.8 +0.2 −2.7 30th 62.2 54.2 average 115%
Cranbourne Botanic Gardens 20.0 +0.4 32.0 2nd 9.6 −0.6 2.1 30th 84.4 63.2 high 134%
Essendon Airport 20.5 +0.5 32.4 2nd 9.8 +0.1 0.6 30th 33.8 58.7 average 58%
Ferny Creek 15.6 −0.5 28.2 2nd 9.2 −0.1 3.0 28th 90.0 96.4 average 93%
Frankston AWS 19.0 −0.2 31.1 2nd 12.2 +0.1 4.0 30th
Melbourne Airport 20.3 +0.1 31.8 2nd 9.9 −0.2 1.2 30th 33.2 44.5 average 75%
Melbourne Regional Office 21.0 +0.7 32.8 2nd 11.6 +0.9 2.9 30th 39.2 57.3 average 68%
Moorabbin Airport 20.0 −0.2 32.6 2nd 10.2 −0.2 2.1 30th 70.6 60.4 average 117%
Phillip Island Penguin Reserve     30.0 2nd 10.6   2.1 13th 22.0 57.9 very low 38%
Rhyll 19.2 +0.2 30.8 2nd 12.4 +0.3 6.8 30th 70.0 62.8 high 111%
Scoresby Research Institute 20.0 0.0 31.8 2nd 9.3 −0.8 0.3 30th 76.0 67.9 average 112%
Viewbank 20.5 −0.9 32.6 2nd 9.4 −0.3 −0.1 30th 63.6
Wallan 17.1 +0.5 27.9 2nd 8.6 0.0 2.8 27th 39.0 56.3 average 69%
Wonthaggi 19.7 +0.1 31.4 2nd 9.8 −0.4 2.0 30th 78.4 79.0 average 99%
West Central (district 87)
Avalon Airport 20.2 −0.2 32.9 2nd 9.3 −0.1 2.2 30th 26.0 30.1 average 86%
Grovedale 20.0 0.0 32.3 2nd 9.0 −0.3 2.6 30th 39.2 43.4 average 90%
Laverton RAAF 20.2 0.0 32.8 2nd 9.3 −0.5 0.3 30th 26.6 46.0 low 58%
Sheoaks 19.1 +0.1 30.8 2nd 8.7 +0.3 0.1 30th 30.0
North Central (district 88)
Castlemaine Prison 19.9 −0.2 30.0 1st 7.4 −0.1 −2.0 30th 28.2 41.4 average 68%
Eildon Fire Tower 17.9 −0.6 28.4 2nd 8.9 −0.3 2.2 29th 64.8 38.3 high 169%
Lake Eildon 21.1 +0.3 31.4 2nd 7.7 −0.1 0.3 30th 75.4 60.0 high 126%
Mangalore Airport 21.5 −0.3 31.7 2nd 8.2 −0.7 1.3 16th 38.0 38.4 average 99%
Maryborough 20.7 0.0 30.1 2nd 7.3 −1.1 0.2 30th 31.1 39.1 average 80%
Redesdale 20.5 −0.3 30.3 1st 7.2 +0.1 −0.3 30th 22.0 39.8 average 55%
Western Plains (district 89)
Ararat Prison 19.4 +0.1 29.7 2nd 6.2 −0.9 −1.4 30th 29.2 42.9 average 68%
Ballarat Aerodrome 18.0 −0.1 28.6 2nd 6.3 −1.0 −2.4 30th 33.0 51.7 average 64%
Westmere 19.5   30.0 1st 6.8   −0.9 30th 35.2
West Coast (district 90)
Aireys Inlet 18.5 −0.5 30.4 2nd 10.5 −0.9 5.6 29th 57.0 35.7 high 160%
Cape Nelson Lighthouse 18.0 0.0 28.4 1st 11.7 −0.5 5.8 30th 65.6 46.6 average 141%
Cape Otway Lighthouse 17.0 −0.7 28.8 2nd 11.3 −0.4 5.4 30th 92.2 71.6 high 129%
Casterton 20.0   32.5 2nd 7.8   0.9 30th 47.8
Casterton Showgrounds 20.4 −0.1 32.2 2nd 7.6 −1.1 −1.0 30th 55.0 43.3 average 127%
Colac 18.6   30.2 2nd 9.0   3.7 29th 43.8
Dartmoor 19.7   33.3 2nd 7.2   −1.1 30th 63.4
Hamilton Airport 19.2 −0.9 30.1 2nd 7.7 −0.5 0.8 30th 36.4 38.0 average 96%
Mortlake Racecourse 19.7 −0.7 31.1 1st 7.2 −0.6 −0.2 30th 47.2 42.2 average 112%
Port Fairy AWS 19.0 −0.3 28.1 2nd 10.4 −0.3 2.8 30th 99.8 44.3 very high 225%
Portland 18.3 −0.1 31.1 2nd 9.0 −0.8 1.8 30th 87.6 56.9 high 154%
Warrnambool Airport NDB 19.9 −0.2 31.9 2nd 8.2 −0.2 0.5 30th 65.6 48.8 high 134%
Weeaproinah 14.5 −0.5 25.1 1st 8.6 −0.2 2.8 29th 176.0 154.2 average 114%

Notes

This statement has been prepared based on information available at 11 am on Friday 1 May 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.

Seasonal Climate Outlook

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

The outlook for May-July 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/

Further information

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