Victoria in May 2017: below average rainfall

Rainfall in Victoria during May was below average in most of central and eastern parts of the State. Daytime and night-time temperatures were mostly close to average.

Below average rainfall in Victoria

  • Averaged across Victoria, rainfall was 34.7% below the long-term May mean of 64.8 mm
  • Rainfall was below average in most eastern and central parts of the State, while it was close to average elsewhere; only parts of Wimmera recorded rainfall above the long-term average for May
  • A low pressure trough brought widespread rainfall to the west of Victoria on the 19th, and to the central and eastern parts of the State on the 20th; daily totals were generally between 5 to 20 mm, but rainfall totals above 50 mm were recorded at several sites in the far East Gippsland
  • The highest daily rainfall total in the State, 82.4 mm, was recorded at Mallacoota, in Victoria's far east on the 20th, while the wettest place in the State was Mount William (Grampians) with 141.0 mm during the month
  • A cold front followed by a low pressure trough which crossed the State on the 27th and 28th brought more rainfall to many places in central and southern parts of Victoria, and snowfalls to the Alps

Close to average temperatures

  • Both daytime and overnight temperatures were generally close to average across the State
  • For Victoria as a whole the mean maximum temperature was only 0.12 °C above the long-term May average, while mean minimum temperature was 0.41 °C below the long-term average for May
  • Although temperatures in May were generally mild, there were several cool days and nights; the end of the month was particularly cool due to the passage of a cold front and cold southerly airstream
  • The lowest overnight temperature in Victoria during the month, -6.3 °C, was recorded at Mount Hotham on the 3rd

Further information

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Extremes in May 2017
Hottest day 23.6 °C at Mildura Airport on the 6th
23.6 °C at Orbost on the 6th
23.6 °C at Yarrawonga on the 18th
Warmest days on average 19.2 °C at Mildura Airport
Coolest days on average 4.8 °C at Mount Hotham
Coldest day -3.3 °C at Mount Hotham on the 31st
Coldest night -6.3 °C at Mount Hotham on the 3rd
Coolest nights on average -0.1 °C at Mount Hotham
Warmest nights on average 12.0 °C at Wilsons Promontory Lighthouse
Warmest night 15.2 °C at Wilsons Promontory Lighthouse on the 19th
15.2 °C at Moorabbin Airport on the 23rd
Warmest on average overall 14.8 °C at Gabo Island Lighthouse
Coolest on average overall 2.4 °C at Mount Hotham
Wettest overall 141.0 mm at Grampians (Mount William)
Wettest day 82.4 mm at Mallacoota on the 20th
Strongest wind gust 120 km/h at Wilsons Promontory Lighthouse on the 6th

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window


Highest May total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
May
Birchip (Woodlands) 63.6 108.4 in 1995 34.9




Summary statistics for May 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
May
2017
Diff
from
average
Highest for
May
2017
Mean for
May
2017
Diff
from
average
Lowest for
May
2017
Total for
May
2017
Average
for
May
Rank of
May
2017
Fraction of
May
average
North Mallee (district 76)
Mildura Airport 19.2 +0.1 23.6 6th 6.1 -1.4 0.9 31st 19.6 25.1 average 78%
Ouyen (Post Office) 18.8 -0.1 22.6 22nd 6.8 -0.4 1.3 31st 23.5 31.5 average 75%
Walpeup Research 18.6 +0.2 22.6 22nd 7.7 -0.1 1.3 31st 20.6 30.4 average 68%
South Mallee (district 77)
Hopetoun Airport 18.2 -0.7 22.0 22nd 5.1 -1.1 -0.2 16th 28.4 27.4 high 104%
Swan Hill Aerodrome 18.5 -0.4 22.3 6th 6.4 0.0 0.8 16th 30.2 25.3 average 119%
North Wimmera (district 78)
Kellalac (Warracknabeal Airport) 17.8   21.7 22nd 6.1   1.4 12th 52.0
Nhill Aerodrome 17.0 -1.0 21.4 21st 6.4 -0.3 1.3 15th 64.0 29.3 v high 218%
Warracknabeal Museum 17.4 -0.5 21.4 21st 6.1 -0.5 1.0 16th 47.8 39.7 average 120%
South Wimmera (district 79)
Edenhope Airport 16.0 -0.9 20.9 22nd 6.2 -1.1 0.0 31st 71.4 43.8 high 163%
Grampians (Mount William) 7.8 -0.7 13.8 10th 3.5 -0.3 -0.4 31st 141.0 127.6 high 111%
Horsham Aerodrome 16.8 -0.9 20.8 22nd 4.9 -0.4 -0.7 7th 61.0 33.3 v high 183%
Kanagulk 15.8 -0.8 20.5 21st 5.2 -1.4 -0.5 10th 82.2 41.4 high 199%
Pyrenees (Ben Nevis) 11.5   15.9 10th 5.2   0.9 31st 60.6 67.7 average 90%
Stawell Aerodrome 15.3 -1.1 19.1 22nd 6.3 0.0 0.7 3rd 62.0 38.8 high 160%
Lower North (district 80)
Charlton 17.7 -0.5 20.7 6th 5.9 -0.6 0.4 3rd 37.6 30.2 high 125%
Echuca Aerodrome 17.8 +0.2 21.2 18th 6.3 -0.3 1.0 31st 26.8 40.5 average 66%
Kerang 18.2 +0.1 22.4 6th 6.9 +0.2 2.8 29th 40.0 36.0 average 111%
Upper North (district 81)
Bendigo Airport 16.6 -0.1 20.2 18th 5.7 +0.4 -0.4 29th 27.8 45.7 average 61%
Shepparton Airport 17.6 0.0 23.0 18th 5.8 +0.2 1.5 31st 13.0 32.9 low 40%
Tatura Inst Sustainable Ag 17.1 -0.2 22.1 18th 5.4 -0.4 -0.1 29th 24.2 44.4 average 55%
Yarrawonga 17.9 -0.2 23.6 18th 5.8 -0.3 1.3 11th 25.0 35.1 average 71%
Lower Northeast (district 82)
Benalla Airport 17.3 -0.2 22.5 18th 4.8 -0.5 0.6 31st 41.4 49.4 average 84%
Corryong Airport 16.4 +0.4 20.1 6th 2.9 -0.3 -1.5 8th 51.7 52.4 average 99%
Dartmouth Reservoir 15.8 -0.2 19.2 18th 4.4 -0.3 -1.0 8th 43.6 86.3 low 51%
Hunters Hill 12.0 +0.2 17.5 18th 5.1 -0.4 -0.6 31st 80.0 96.2 average 83%
Rutherglen Research 17.2 +0.2 22.2 18th 3.4 -0.9 -2.0 31st 32.6 51.5 average 63%
Strathbogie 14.4 0.0 19.7 18th 3.0 -0.7 -1.9 15th 60.6 95.3 average 64%
Wangaratta Aero 17.3 -0.2 22.5 18th 4.3 0.0 -0.4 31st 38.4 57.5 average 67%
Upper Northeast (district 83)
Falls Creek 6.1 +0.1 13.9 18th 0.7 +0.1 -6.0 31st 44.6 98.4 low 45%
Mount Buller 5.7 -0.5 12.1 18th 0.7 -0.3 -4.6 3rd 115.2 140.7 average 82%
Mount Hotham 4.8 +0.2 12.5 18th -0.1 0.0 -6.3 3rd 80.4 142.3 average 57%
Omeo 14.8 +0.3 19.3 18th 2.1 -0.7 -3.0 3rd 18.0 29.2 average 62%
East Gippsland (district 84)
Gabo Island Lighthouse 17.7 +0.8 21.0 6th 11.9 +0.7 7.9 31st 82.0 98.2 average 84%
Gelantipy 12.9 -0.1 17.2 6th 4.6 -0.3 0.4 4th 32.2 46.3 average 70%
Lakes Entrance (Eastern Beach Road) 17.5 -0.6 23.5 6th 8.6 -0.1 3.8 4th 21.4 39.7 low 54%
Mallacoota 17.9 +0.3 20.8 6th 9.2 -0.1 4.9 30th 99.8 82.4 high 121%
Mount Nowa Nowa 16.0 +0.1 21.9 6th 8.5 -0.2 4.1 31st 24.6 56.7 low 43%
Orbost     23.6 6th 8.0 -0.5 4.2 12th
Point Hicks (Lighthouse) 17.3 +0.3 23.2 6th 10.6 -0.5 6.6 30th 75.7 94.0 average 81%
West Gippsland (district 85)
Bairnsdale Airport 17.6 0.0 23.3 6th 5.9 -0.8 1.5 4th 14.4 44.4 v low 32%
Corner Inlet (Yanakie) 16.8   20.3 20th 8.0   2.2 12th 79.0
East Sale Airport 17.4 +0.5 22.1 6th 5.6 -0.7 0.8 27th 15.0 50.2 low 30%
Morwell (Latrobe Valley Airport) 17.1 +0.2 21.1 22nd 5.9 -0.6 1.3 4th 47.0 53.9 average 87%
Mount Baw Baw 6.5 +0.1 11.2 22nd 1.6 0.0 -2.8 31st 96.4 120.5 average 80%
Mount Moornapa 15.2 +0.3 21.6 6th 7.8 -0.1 3.6 31st 22.0 45.0 low 49%
Nilma North (Warragul) 16.5   20.5 21st 6.2   0.5 4th 75.8
Pound Creek 17.1 0.0 20.9 22nd 7.3 -0.9 1.4 12th 83.2 87.6 average 95%
Wilsons Promontory Lighthouse 15.5 +0.5 19.3 22nd 12.0 +0.9 8.3 29th 100.8 113.4 average 89%
Yarram Airport 17.0   21.7 22nd 6.5   1.6 12th 46.4 46.5 average 100%
East Central (district 86)
Bundoora (Latrobe University) 16.8 +0.1 20.7 18th 7.3 -0.7 2.2 4th 34.7 51.2 low 68%
Cerberus 16.8 +0.2 20.7 22nd 8.1 -0.4 2.9 5th 54.0 68.7 average 79%
Coldstream 16.8 +0.2 21.5 18th 4.8 -0.8 -0.6 4th 42.2 66.3 low 64%
Cranbourne Botanic Gardens 16.7 +0.3 20.3 22nd 9.1 +0.6 3.9 5th 49.5 65.2 average 76%
Essendon Airport 16.9 +0.6 19.9 5th 8.0 +0.2 3.4 12th 15.6 48.3 v low 32%
Ferny Creek 13.2   17.7 18th 7.7   2.9 31st 72.6
Frankston AWS 15.9 -0.1 20.1 18th 10.3 -0.3 5.6 31st
Melbourne (Olympic Park) 17.2   20.5 5th 9.2   5.6 16th 25.0
Melbourne Airport 16.6 -0.1 19.7 18th 7.5 -0.8 3.6 4th 20.0 39.0 low 51%
Moorabbin Airport 17.3 +0.3 20.9 22nd 8.4 -0.3 3.6 16th 32.0 68.9 low 46%
Rhyll 16.6 +0.3 19.5 18th 10.7 0.0 7.5 29th 64.0 73.2 average 87%
Scoresby Research Institute 17.0 +0.7 20.7 18th 7.4 -0.9 2.1 4th 53.8 87.3 low 62%
Viewbank 17.0 -0.2 21.1 18th 7.1 -0.9 2.4 4th 24.4 50.4 low 48%
Wonthaggi 17.2 +0.5 20.7 22nd 8.7 0.0 4.4 16th 89.2 98.3 average 91%
West Central (district 87)
Avalon Airport 16.9 -0.4 20.6 21st 7.1 -0.5 2.7 5th 29.2 35.4 average 82%
Breakwater (Geelong Racecourse) 17.0   20.8 21st 8.0   3.5 12th 27.8
Laverton RAAF 16.8 -0.1 20.2 23rd 7.6 -0.2 3.3 5th 16.8 45.7 low 37%
Sheoaks 15.4 -0.2 19.9 22nd 6.4 -1.0 1.1 3rd 32.4 32.8 average 99%
North Central (district 88)
Castlemaine Prison 15.8 +0.1 19.0 18th 6.2 +0.8 0.0 31st 23.2 55.6 low 42%
Eildon Fire Tower 13.5 +0.2 19.8 18th 6.5 -0.2 1.6 31st 33.4 54.8 low 61%
Lake Eildon 16.3 +0.1 21.0 18th 5.5 -0.5 1.0 31st 37.2 78.1 low 48%
Mangalore Airport 16.8 +0.1 22.1 18th 5.5 -0.6 -0.8 29th 24.6 53.0 low 46%
Maryborough 16.1 -0.1 20.6 18th 5.6 -0.5 0.3 29th 27.2 48.9 average 56%
Redesdale 16.8 +0.7 20.4 18th 4.9 -0.3 -1.1 29th 24.2 55.5 low 44%
Wallan (Kilmore Gap) 13.1 +0.3 18.3 18th 7.1 +0.2 2.5 29th 32.2 55.1 low 58%
Western Plains (district 89)
Ararat Prison 16.2 +0.7 21.0 21st 5.3 -0.3 -1.2 31st 61.6 53.3 average 116%
Ballarat Aerodrome 14.0 +0.3 18.6 18th 4.8 -0.9 -3.0 31st 44.0 63.8 average 69%
Westmere 15.3 -0.5 19.4 18th 5.3 -1.2 -0.1 16th 46.8 49.3 average 95%
West Coast (district 90)
Aireys Inlet 16.2 -0.1 20.3 22nd 9.7 -0.2 5.8 29th 35.8 50.1 average 71%
Cape Nelson Lighthouse 15.9 -0.2 21.2 22nd 10.3 -0.6 6.1 10th 66.0 72.2 average 91%
Cape Otway Lighthouse 15.5 -0.1 20.3 22nd 10.5 +0.4 7.3 10th 83.8 91.1 average 92%
Casterton 15.4 -0.9 20.4 21st 5.9 -1.4 0.4 10th 68.4 66.1 average 103%
Colac (Mount Gellibrand) 14.5 -0.7 18.3 21st 7.8 -0.2 2.9 31st 41.0 40.9 average 100%
Dartmoor 15.8   20.9 22nd 6.4   -0.5 13th 62.8
Hamilton Airport 14.7 -1.0 19.2 22nd 6.1 -0.5 1.2 31st 59.4 52.1 average 114%
Mortlake Racecourse 15.9 -0.3 20.3 22nd 5.7 -1.0 0.0 13th 52.2 51.6 average 101%
Port Fairy AWS 16.2 -0.7 21.6 21st 8.5 -0.7 3.3 13th 53.8 68.2 low 79%
Portland (Cashmore Airport) 15.6 -0.3 20.8 22nd 7.6 -0.8 2.0 13th 80.0 82.2 average 97%
Warrnambool Airport NDB 15.6 -1.0 20.7 21st 6.7 -0.8 0.9 13th 65.2 71.0 average 92%

Notes

The Monthly climate summary, generally published on the first working day of each month, lists 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. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This statement has been prepared based on information available at 1 pm on Thursday 1 June 2017. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites 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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries