Victoria in April 2012: Rainfall slightly less than that usually received.

  • Highlights:

    • Overnight temperatures near to those in most years
    • Daytime temperatures warmer than those in most years
    • Rainfall slightly less than that in most years

Summary

Bureau of Meteorology data show that across the State of Victoria, overnight minimum temperatures were near to those usually experienced  Daytime maximum temperatures at most localities were warmer than those registered in the past. Total rainfall for the month was generally slightly less than that usually recorded.

Over the northern plains, minimum temperatures were near to those usually experienced (average departure from normal 0C). Daytime maximum temperatures at most localities were much warmer than those registered in the past (average departure from normal 1.6C). Total rainfall for the month was generally much less than that usually recorded (average percentage of normal received 45.6%).

In southern districts, minimum temperatures were slightly warmer than those usually experienced (average departure from normal 0.7C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.1C). Total rainfall for the month was generally close to that usually recorded - somewhat below normal in the southwest, somewhat above normal in Gippsland (average percentage of normal received 98.8%).

Synoptic Summary

The mean Sea Level Pressure (MSLP) anomaly distribution reflects a 'return to the westerlies' - as the La Nia phenomenon came to end, with a major persistence of cyclonic activity over the Southern Ocean to the south of Western Australia and anticyclones dominating over inland Australia. This is the reason for the drier than usual conditions over northern Victoria.

However, we also have a northeastward sloping trough out of the Southern Ocean low. Fronts associated with this trough brought some showery periods to southern districts, especially to Gippsland.

Details

In the Mallee, overnight minimum temperatures were near to those usually experienced (average departure from normal 0C). Daytime maximum temperatures at most localities were much warmer than those registered in the past (average departure from normal 1.6C). Total rainfall for the month was generally much less than that usually recorded (average percentage of normal received 20.5%).

In the Wimmera, overnight minimum temperatures were slightly warmer than those usually experienced (average departure from normal 0.6C). Daytime maximum temperatures at most localities were much warmer than those registered in the past (average departure from normal 4.2C). Total rainfall for the month was generally much less than that usually recorded (average percentage of normal received 19.5%).

Sunset over Mount Arapiles, west of  Horsham, Victoria / photograph by Tim Boehm.

In the Northern Country, overnight minimum temperatures were near to those usually experienced (average departure from normal 0.1C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.2C). Total rainfall for the month was generally much less than that usually recorded (average percentage of normal received 41.5%).

In Victoria's North Central District, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.4C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.1C). Total rainfall for the month was generally less than that usually recorded (average percentage of normal received 53%).

In the North East District, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.1C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.6C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 77.7%).

In East Gippsland, overnight minimum temperatures were much warmer than those usually experienced (average departure from normal 1.5C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.5C). Total rainfall for the month was generally more than that usually recorded (average percentage of normal received 149%).

In West Gippsland, overnight minimum temperatures were warmer than those usually experienced (average departure from normal 1.3C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.1C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 77.5%).

In the Central District, overnight minimum temperatures were near to those usually experienced (average departure from normal 0.2C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.2C). Total rainfall for the month was generally close to that usually recorded (average percentage of normal received 93.3%).

In the Western District, overnight minimum temperatures were near to those usually experienced (average departure from normal 0C). Daytime maximum temperatures at most localities were much warmer than those registered in the past (average departure from normal 1.7C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 78%).

Melbourne climate summary for the month of April 2012

Rainfall close to that usually received.

Located in the Central District at the head of Port Phillip Bay, Melbourne is Victoria's State Capital. Here, overnight minimum temperatures were much warmer than those usually experienced and averaged 12.0C (departure from normal 1.2C). That the overnight temperatures in Melbourne are higher than those in most surrounding localities is a consequence of the city being under the influence of the effect of urbanisation (cities are usually warmer than their rural surroundings, especially at night, because of heat stored in bricks and concrete and trapped between close-packed buildings). Daytime maximum temperatures were much warmer than those usually experienced and averaged 21.9C (departure from normal 1.6C). Total rainfall for the month was 49.6 mm, this being close to that usually recorded (normal 57.3 mm, percentage of normal received 87%).

Rainfall

Some sites had their highest total April rainfall on record.

Some sites had their highest total April rainfall for at least 10 years.

There is a map of total rainfall below.

There is a map of rainfall deciles below.

Temperature

Maximum temperature

Some sites had their coldest April day (lowest maximum temperature) on record.

There is a map of mean maximum temperatures below.

There is a map of maximum temperature anomalies below.

Minimum temperature

There is a map of mean minimum temperatures below.

There is a map of minimum temperature anomalies below.

Other phenomena

There were thunderstorms in some parts during the afternoons and evenings of the 2nd, 6th, 22nd and 23rd, and also some notable fog areas on the morning of the 21st.

Further information

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Extremes in April 2012
Hottest day 35.2 C at Hopetoun Airport on the 6th
Warmest days on average 24.8 C at Mildura Airport
Coolest days on average 8.3 C at Mount Hotham
Coldest day -0.9 C at Mount Hotham on the 24th
Coldest night -5.1 C at Mount Hotham on the 10th
Coolest nights on average 2.8 C at Mount Hotham
Warmest nights on average 14.0 C at Gabo Island Lighthouse
Warmest night 18.9 C at Gabo Island Lighthouse on the 6th
Warmest on average overall 17.5 C at Ouyen (Post Office)
Coolest on average overall 5.6 C at Mount Hotham
Wettest overall 193.8 mm at Mount Baw Baw
Highest wind gust 133 km/h at Wilsons Promontory Lighthouse on the 9th

Maps

Anomaly in mean maximum temperature

Map of Anomaly in mean maximum temperature

Mean maximum temperature

Map of Mean maximum temperature

Anomaly in mean minimum temperature

Map of Anomaly in mean minimum temperature

Mean minimum temperature

Map of Mean minimum temperature

Rainfall deciles

Map of Rainfall deciles

Rainfall totals

Map of Rainfall totals


Record highest total April rainfall
Total rainfall
for April 2012 (mm)
Previous wettest
for April
Years of
record
Average for
April
Barwon Heads Golf Club 64.4 54.8 in 2009 11 38.3

Highest total April rainfall for at least 10 years
Total rainfall
for April 2012 (mm)
Most recent April
at least this wet
Years since
wetter
Average for
April
Scoresby Research Institute 117.0 131.4 in 1965* 43 67.6
Club Terrace 160.6 184.6 in 1994* 15 93.8
Lilydale 123.2 145.2 in 1996* 15 75.7
Bonbeach (Carrum) 94.8 118.8 in 1995* 14 59.6
Aireys Inlet 57.4 223.0 in 2001 11 50.8
Croydon (Council Depot) 108.6 115.8 in 2001 11 75.8
Bonang 81.8 146.6 in 2002 10 68.5
Combienbar AWS 116.0 213.6 in 2002 10 74.7
Gabo Island Lighthouse 163.8 178.2 in 2002 10 83.9
Genoa (Fools Haven) 139.8 159.6 in 2002 10 93.4
Mallacoota 184.4 201.8 in 2002 10 92.1

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.




Record lowest April daily maximum temperature
Lowest daily maximum
temperature
in April 2012 (C)
Previous coolest
for April
Years of
record
Average for
April
Horsham Aerodrome 11.6 on the 24th 13.0 on the 27th in 1998 15 22.2



Summary statistics for April 2012
Maximum temperatures
for April
(C)
Minimum temperatures
for April
(C)
Rainfall
for April
(millimetres)
Mean for
April
2012
Diff
from
average
Highest for
April
2012
Mean for
April
2012
Diff
from
average
Lowest for
April
2012
Total for
April
2012
Average
for
April
Rank of
April
2012
Fraction of
April
average
Southwest Slopes (South) (district 72)
Albury Airport AWS 22.4 +0.1 29.9 3rd 9.0 +1.0 1.0 10th 46.4 36.0 high 129%
Hume Reservoir 22.3 +0.7 29.0 3rd 10.1 +0.1 2.2 10th 58.0 51.5 average 113%
North Mallee (district 76)
Mildura Airport 24.8 +1.3 33.7 6th 9.1 -1.0 2.8 12th 4.0 18.0 low 22%
Ouyen (Post Office) 24.7 +1.3 34.0 6th 10.2 +0.7 4.4 10th 3.8 21.4 low 18%
Walpeup Research 24.6 +1.8 34.1 6th 10.3 +0.3 3.2 10th 1.6 22.6 v low 7%
South Mallee (district 77)
Hopetoun Airport 24.0   35.2 6th 7.9   1.3 24th 7.4
Swan Hill Aerodrome 24.1 +0.4 31.7 6th 8.3 -0.5 2.4 30th 2.8 15.6 low 18%
North Wimmera (district 78)
Nhill Aerodrome 23.4   33.7 6th 8.9   3.4 11th 6.0
Warracknabeal Museum 23.4 +1.0 33.6 6th 8.3 -0.6 2.9 30th 8.0 26.1 low 31%
South Wimmera (district 79)
Edenhope Airport 22.3   31.6 6th 9.4   4.1 24th 19.6
Grampians (Mount William) 13.4   22.6 6th 6.5   0.3 25th 40.6
Horsham Aerodrome 22.8 +0.6 33.8 6th 7.1 +0.1 1.4 30th 12.6 26.5 average 48%
Kanagulk 22.1   33.2 6th 7.9   2.3 30th 20.6
Longerenong 22.9 +1.4 34.1 6th 7.7 -0.3 0.4 24th 11.8 28.9 low 41%
Pyrenees (Ben Nevis) 16.2   25.5 6th 8.5   0.8 25th 30.8
Stawell Aerodrome 21.4 +0.7 31.4 6th 8.3 0.0 2.3 30th 15.6 29.2 average 53%
Lower North (district 80)
Charlton 23.4   32.6 6th 8.0   2.5 30th 5.0
Echuca Aerodrome 23.2 +1.0 30.7 6th 8.2 -1.2 3.0 30th 10.2 32.4 low 31%
Kerang 23.7 +1.0 31.3 6th 9.3 -0.1 4.3 24th 10.2 25.3 average 40%
Kyabram 22.5 +0.9 29.5 6th 7.5 -1.2 1.5 10th 33.2 36.7 average 90%
Upper North (district 81)
Bendigo Airport 21.8 +0.6 29.0 6th 7.6 0.0 1.8 11th 11.6 28.4 low 41%
Shepparton Airport 22.1 -0.3 28.9 6th 8.0 -0.2 2.8 30th 38.4 32.9 average 117%
Tatura Inst Sustainable Ag 21.9 +0.4 28.6 6th 7.6 -0.6 2.0 12th 26.8 34.3 average 78%
Yarrawonga 23.0 +0.2 30.1 6th 9.6 +0.8 2.4 11th 23.0 26.5 average 87%
Lower Northeast (district 82)
Beechworth Woolshed 22.0 +0.4 28.8 5th 6.6 +0.5 -2.1 10th 30.0 45.6 average 66%
Benalla Airport 22.5   29.3 6th 7.8   2.0 11th 16.2
Corryong Airport 21.4   28.2 4th 6.7   -0.7 11th 17.4
Dartmouth Reservoir 20.9 +0.2 27.5 5th 9.1 +2.1 3.5 11th 38.4 59.1 average 65%
Hunters Hill 16.9 +0.7 24.1 5th 8.8 +0.6 0.8 10th 49.0 64.1 average 76%
Rutherglen Research 22.4 +0.5 29.5 3rd 6.3 -0.8 -0.7 10th 34.2 40.1 average 85%
Strathbogie 18.9 +0.1 25.3 5th 5.4 -0.2 -1.0 10th 37.6 65.9 average 57%
Wangaratta Aero 22.6 +0.2 29.5 3rd 7.1 +0.3 0.0 11th 12.6 38.5 low 33%
Upper Northeast (district 83)
Dinner Plain (Mount Hotham Airport) 14.9 +0.1 22.2 5th 3.9 +0.7 -3.5 30th 23.2 44.7 v low 52%
Edi Upper 20.9 -0.3 26.9 5th 7.9 -0.3 0.5 10th 19.6 59.0 low 33%
Falls Creek 9.9 +0.2 18.1 5th 3.8 +0.9 -4.1 10th 75.6 81.0 average 93%
Mount Buller 9.7 -0.2 17.0 5th 3.6 0.0 -3.8 10th 67.0 105.4 average 64%
Mount Hotham 8.3 0.0 15.8 5th 2.8 +0.3 -5.1 10th 75.2 95.0 average 79%
Omeo 18.6   25.4 5th 5.8   -1.0 11th 21.8
East Gippsland (district 84)
Combienbar AWS 18.3 +0.7 27.6 6th 10.3 +0.9 2.3 10th 116.0 74.7 high 155%
Gabo Island Lighthouse 19.4 +0.2 23.2 15th 14.0 +0.5 8.3 10th 163.8 83.9 v high 195%
Gelantipy 16.8 +0.4 25.3 3rd 8.0 +1.2 0.8 30th 73.8 51.6 high 143%
Lakes Entrance (Eastern Beach Road) 20.6   29.0 6th 12.2   7.0 30th 65.6
Mallacoota 19.8 -0.1 27.8 3rd 12.5 +1.0 5.4 30th 184.4 92.1 high 200%
Mount Nowa Nowa 19.5 +0.4 27.8 6th 11.3 +0.7 5.3 10th 74.8 76.8 average 97%
Orbost 21.2 +0.4 29.1 6th 11.4 +0.9 4.3 30th 67.6 75.1 average 90%
Point Hicks (Lighthouse) 20.0 +0.2 28.8 6th 13.4 +0.4 7.1 10th 130.2 85.5 high 152%
West Gippsland (district 85)
Bairnsdale Airport 21.4 +0.7 30.1 6th 9.9 +1.4 2.9 30th 33.6 55.8 average 60%
East Sale Airport 20.9 +0.6 27.7 3rd 9.8 +1.2 2.4 30th 25.2 47.9 low 53%
Morwell (Latrobe Valley Airport) 20.5 0.0 26.0 15th 9.5 +0.9 3.7 8th 57.8 58.9 average 98%
Mount Baw Baw 9.6 -0.2 18.6 4th 3.7 0.0 -3.0 10th 193.8 145.6 high 133%
Mount Moornapa 18.8 +0.6 28.3 6th 10.8 +1.1 4.1 30th 22.6 78.0 low 29%
Noojee (Slivar) 20.8 +2.0 27.2 6th 8.5 +1.1 3.6 10th 44.2 84.8 low 52%
Pound Creek 20.8   29.2 6th 9.7   1.9 30th 78.6
Willow Grove (Blue Rock Reservoir) 19.7 0.0 29.0 1st 10.5 +1.0 5.9 30th 55.0 59.5 average 92%
Wilsons Promontory Lighthouse 18.4 +1.1 25.2 2nd 13.8 +1.1 8.5 10th 83.2 85.2 average 98%
Yarram Airport 20.6   29.2 6th 9.1   1.0 30th 42.4
East Central (district 86)
Bundoora (Latrobe University) 21.5 +1.0 27.5 6th 10.2 +0.5 5.0 12th 52.2 54.4 average 96%
Cerberus 20.4 +0.7 29.3 6th 10.7 +0.8 3.6 30th 64.8 66.4 average 98%
Coldstream 21.3 +1.0 28.3 6th 7.0 +0.4 1.2 12th 81.6 62.4 high 131%
Coldstream Comparison 21.2   28.2 6th 6.8   1.1 30th 81.6
Cranbourne Botanic Gardens 20.6 +0.8 30.2 6th 10.4 +0.2 4.5 30th 96.7 73.1 high 132%
Essendon Airport 21.4 +1.4 28.7 6th 10.3 +0.5 4.2 30th 32.2 54.6 low 59%
Ferny Creek 17.3   24.3 6th 10.3   4.2 24th 116.8
Frankston AWS 20.3 +1.1 27.1 6th 13.1 +0.9 7.1 30th
Melbourne Airport 21.0 +0.7 28.0 6th 9.9 -0.3 3.8 30th 34.4 43.6 average 79%
Melbourne Regional Office 21.9 +1.6 28.5 6th 12.0 +1.2 6.2 30th 49.6 57.3 average 87%
Moorabbin Airport 21.0 +0.9 29.7 6th 10.8 +0.4 3.0 30th 67.4 63.1 average 107%
Phillip Island Penguin Reserve 20.2 +0.4 27.5 6th 12.1 +1.5 4.8 30th 77.3 64.7 average 119%
Rhyll 20.3 +0.9 26.5 6th 13.3 +0.8 8.6 10th 56.8 62.3 average 91%
Scoresby Research Institute 21.2 +1.3 28.4 6th 10.0 -0.1 3.7 30th 117.0 67.6 v high 173%
Viewbank 21.7 +0.3 29.1 6th 9.8 -0.2 3.6 30th 59.4 58.4 average 102%
Wallan (Kilmore Gap) 17.5 +0.6 24.0 6th 9.5 +0.8 3.8 10th 30.6 55.3 low 55%
Wonthaggi 20.8 +1.2 28.9 6th 11.6 +1.3 5.0 30th 96.1 79.4 average 121%
West Central (district 87)
Avalon Airport 21.6 +1.4 31.5 6th 9.8 +0.3 3.6 30th 30.2 36.8 average 82%
Breakwater (Geelong Racecourse) 21.7   31.8 6th 10.6   5.2 30th 45.4
Laverton RAAF 21.3 +1.1 30.0 6th 9.6 -0.2 3.0 30th 38.8 45.6 average 85%
Sheoaks 20.1 +1.0 28.1 6th 9.0 +0.3 2.5 30th 36.8 37.8 average 97%
North Central (district 88)
Castlemaine Prison 20.1 0.0 27.9 5th 7.4 -0.1 0.6 10th 16.6 41.0 low 40%
Eildon Fire Tower 17.8 -0.5 24.5 5th 9.5 +0.4 2.8 10th 39.0 42.4 average 92%
Lake Eildon 21.2 +0.4 27.8 5th 8.1 +0.3 2.4 10th 47.2 59.8 average 79%
Mangalore Airport 21.5 +0.1 28.1 5th 7.8 -0.7 2.3 13th 25.6 39.0 average 66%
Maryborough 21.7 +1.2 29.7 6th 7.9 -0.4 2.7 30th 15.1 39.3 low 38%
Redesdale 21.2 +0.8 28.3 5th 6.8 -0.3 1.9 10th 11.8 40.3 low 29%
Western Plains (district 89)
Ararat Prison 21.0 +1.6 30.1 6th 7.2 0.0 -0.5 30th 41.1 43.1 average 95%
Ballarat Aerodrome 19.0 +1.4 26.8 5th 6.9 -0.6 0.1 30th 44.6 51.5 average 87%
Westmere 21.4   31.8 6th 8.1   0.9 30th 30.2
West Coast (district 90)
Aireys Inlet 20.3 +1.4 31.0 6th 12.2 +0.7 7.4 10th 57.4 50.8 high 113%
Cape Nelson Lighthouse 20.0 +2.0 31.6 6th 12.7 +0.5 8.8 13th 27.0 44.1 low 61%
Cape Otway Lighthouse 18.7 +0.7 30.5 6th 12.9 +1.3 8.6 10th 76.8 71.4 average 108%
Casterton 21.7   31.6 6th 9.0   3.5 12th 28.4
Colac (Mount Gellibrand) 20.0 +0.9 30.4 6th 10.3 +0.5 5.3 10th 31.6 41.4 average 76%
Dartmoor 21.8   31.3 6th 8.9   2.6 13th 37.8
Hamilton Airport 21.1 +1.2 32.1 6th 8.0 -0.3 2.9 24th 24.2 39.0 low 62%
Mortlake Racecourse 22.4 +2.6 33.0 6th 8.1 +0.3 0.5 30th 30.2 43.7 low 69%
Port Fairy AWS 20.3 +1.0 32.4 6th 11.2 +0.5 5.0 30th 29.4 51.4 low 57%
Portland (Cashmore Airport) 20.4 +2.0 30.7 6th 10.1 +0.3 4.8 12th 40.0 57.9 low 69%
Portland NTC AWS 19.3   29.8 6th 12.2   7.4 12th
Warrnambool Airport NDB 21.7 +1.7 32.5 6th 9.1 +0.4 2.2 17th 28.6 53.5 low 53%

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 1 pm on Tuesday 1 May 2012. 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