Victoria in May 2018: mostly warm, close to average rainfal

Daytime and night-time temperatures in May were warmer than average in most parts of Victoria. Rainfall was generally close to average, with smaller areas of below average rainfall in the north of the State, while several areas in the south and east had above average May rainfall.

Close to average rainfall

  • Several areas in the north of Victoria observed drier than average conditions in May; elsewhere rainfall was close to average, with parts of West Coast, Western Plains, West and North Central and East Gippsland Districts recording above average rainfall
  • Averaged across the State rainfall was 10.1% below the long-term May mean of 64.8 mm
  • Cold fronts and associated troughs brought widespread rainfall to Victoria on the 4th, with daily totals generally between 10 and 30 mm
  • A complex low pressure system brought more widespread rainfall to the State between the 10th and 12th, with some daily totals exceeding 40 mm; Mortlake Racecourse and Sheoaks had their highest May daily rainfall on record on the 11th
  • The highest daily rainfall for the State, 95 mm, was recorded at Cann River (East Gippsland) on the 12th; the wettest place during the month was Toolangi (Mount St Leonard), with 169.6 mm

A warm month overall

  • Days were warmer than average across the State, except in the west where daytime temperatures were close to average; in contrast, nights were warmer in central and southern parts of Victoria, with close to average night-time temperatures in the north
  • Victoria's mean daytime and night time temperatures were 0.61 °C and 0.46 °C above the average respectively
  • The first few days of the month were unseasonably warm with Point Hicks (East Gippsland) reaching 29.6 °C on the 3rd, the highest temperature in Victoria during May; many sites had their highest May temperature on record on the 3rd
  • Temperatures across Victoria plummeted on the 10th, as Antarctic air swept across the State following the passage of a complex low pressure system
  • Victoria's lowest maximum and minimum temperatures for the month were recorded during this event, with Mount Hotham only reaching −2.6 °C on the 10th, and falling to −6.0 °C on the morning of the 11th
  • Warm period between the 26th and 28th resulted when a high pressure system situated in the Tasman Sea directed a warm northerly airflow across Victoria; some sites (i.e. Longerenong, Ouyen, Kyabram and Benalla Airport) set late season maximum temperature records on the 27th and 28th

Strong winds and snow

  • The strongest winds during autumn, associated with the passage of a cold front, were recorded on the 11th, with gusts of 143 km/h reported at Mount Hotham
  • Snow fell across the Alpine region on the 11th and 12th, as Antarctic air swept across Victoria following the passage of a complex low pressure system

Further information

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Extremes in May 2018
Hottest day 29.6 °C at Point Hicks (Lighthouse) on the 3rd
Warmest days on average 20.2 °C at Ouyen (Post Office)
Coolest days on average 5.0 °C at Mount Hotham
Coldest day -2.6 °C at Mount Hotham on the 10th
Coldest night -6.0 °C at Mount Hotham on the 11th
Coolest nights on average -0.1 °C at Mount Hotham
Warmest nights on average 12.1 °C at Wilsons Promontory Lighthouse
Warmest night 17.7 °C at Cape Otway Lighthouse on the 3rd
Warmest on average overall 14.7 °C at Gabo Island Lighthouse
Coolest on average overall 2.4 °C at Mount Hotham
Wettest overall 169.6 mm at Toolangi (Mount St Leonard DPI)
Wettest day 95.0 mm at Cann River on the 12th
Strongest wind gust 143 km/h at Mount Hotham on the 11th
143 km/h at Mount Hotham on the 12th

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


Record highest May daily rainfall
New record
(mm)
Old
record
Years of
record
Mortlake Racecourse 47.4 on the 11th 37.0 on the 6th in 2000 24
Sheoaks 32.2 on the 11th 19.0 on the 6th in 2000 24



Highest May total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
May
Meredith 83.6 105.4 in 1987 57.1
Coleraine Hospital 85.3 99.6 in 1987* 57.3
Swifts Creek 63.2 66.4 in 1987* 40.9
Terang 127.0 131.2 in 1987* 74.7
Woodend 115.6 130.5 in 1992* 74.8

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




Record highest May temperature
New record
(°C)
Old
record
Years of
record
Average for
May
Rutherglen Research 28.7 on the 3rd 27.8 on the 8th in 1923 101 17.0
Point Hicks (Lighthouse) 29.6 on the 3rd 27.5 on the 1st in 1997 47 17.0
Strathbogie 23.0 on the 3rd = 23.0 on the 8th in 1980 41 14.4
Morwell (Latrobe Valley Airport) 26.7 on the 3rd = 26.7 on the 1st in 1997 35 16.9
Wangaratta Aero 28.2 on the 3rd 27.9 on the 1st in 1988 32 17.4
Gelantipy 22.6 on the 1st 21.5 on the 5th in 2005 26 13.0
Yarrawonga 28.9 on the 3rd 27.5 on the 1st in 1997 26 18.1
Mount Nowa Nowa 26.5 on the 3rd 25.8 on the 1st in 1997 23 15.9
Shepparton Airport 26.0 on the 3rd 25.7 on the 7th in 2002 22 17.6



Record lowest May daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
May
Castlemaine Prison 3.5 on the 31st 5.4 on the 31st in 1977 48 15.7



Summary statistics for May 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
May
2018
Diff
from
average
Highest for
May
2018
Mean for
May
2018
Diff
from
average
Lowest for
May
2018
Total for
May
2018
Average
for
May
Rank of
May
2018
Fraction of
May
average
North Mallee (district 76)
Mildura Airport 19.4 +0.3 26.3 2nd 6.9 -0.5 2.4 17th 17.4 25.0 average 70%
Ouyen (Post Office) 20.2 +1.3 26.8 2nd 7.2 0.0 3.3 17th 26.1 31.4 average 83%
Walpeup Research 19.1 +0.7 26.4 2nd 7.4 -0.4 2.6 16th
South Mallee (district 77)
Hopetoun Airport 19.1 +0.2 26.4 2nd 5.9 -0.2 0.1 17th 23.0 27.1 average 85%
Swan Hill Aerodrome 19.1 +0.3 26.4 2nd 6.5 +0.1 -0.2 26th 19.6 25.1 average 78%
North Wimmera (district 78)
Nhill Aerodrome 17.0 -0.9 24.7 2nd 7.6 +0.9 2.0 14th 34.0 29.6 average 115%
Warracknabeal Museum 17.9 0.0 25.5 2nd 6.9 +0.3 -0.5 26th 34.6 39.6 average 87%
South Wimmera (district 79)
Edenhope Airport 16.3 -0.5 24.7 2nd 8.6 +1.4 3.0 16th 66.0 45.4 high 145%
Grampians (Mount William) 8.4 0.0 15.3 2nd 3.5 -0.3 -0.9 11th 157.6 129.9 high 121%
Horsham Aerodrome 17.1 -0.5 25.3 2nd 6.8 +1.5 0.6 26th 39.0 33.5 high 116%
Kanagulk 16.1 -0.5 24.7 2nd 7.7 +1.2 0.8 26th 71.0 43.3 high 164%
Longerenong 17.3 +0.2 25.6 2nd 6.8 +0.9 0.7 14th 43.8 42.7 average 103%
Pyrenees (Ben Nevis) 10.8 -0.3 18.6 1st 5.6 +0.1 0.4 11th
Stawell Aerodrome 15.8 -0.5 23.6 2nd 7.5 +1.2 1.6 30th 49.2 39.3 high 125%
Lower North (district 80)
Charlton 18.4 +0.3 25.6 2nd 6.3 -0.1 -0.2 26th 39.4 30.8 high 128%
Echuca Aerodrome 18.7 +1.1 25.2 3rd 6.4 -0.2 0.1 26th 29.7 40.5 average 73%
Kerang 18.8 +0.7 26.4 2nd 7.1 +0.4 1.2 26th 24.2 35.9 average 67%
Kyabram 18.4 +1.1 25.1 3rd 6.3 +0.2 1.3 17th 35.8 41.9 average 85%
Upper North (district 81)
Bendigo Airport 17.5 +0.8 24.1 2nd 5.9 +0.6 1.1 19th 51.2 45.9 average 112%
Shepparton Airport 18.0 +0.4 26.0 3rd 5.7 +0.1 1.3 14th 33.0 32.9 average 100%
Tatura Inst Sustainable Ag 17.6 +0.3 25.3 3rd 5.9 +0.1 1.1 26th 37.2 44.3 average 84%
Yarrawonga 18.9 +0.8 28.9 3rd 6.0 -0.1 0.5 17th 34.6 35.1 average 99%
Lower Northeast (district 82)
Benalla Airport 18.0 +0.5 27.7 3rd 4.4 -0.8 -0.8 17th 35.5 48.0 low 74%
Dartmouth Reservoir 15.9 -0.1 24.3 3rd 4.2 -0.5 0.6 17th 82.4 86.2 average 96%
Hunters Hill 11.9 +0.1 20.1 3rd 5.1 -0.4 -0.4 11th 87.8 95.9 average 92%
Rutherglen Research 18.1 +1.1 28.7 3rd 4.0 -0.3 -2.1 17th 44.4 51.4 average 86%
Strathbogie 14.5 +0.1 23.0 3rd 3.9 +0.3 -1.1 15th 70.0 95.1 average 74%
Wangaratta Aero 18.1 +0.7 28.2 3rd 3.6 -0.7 -2.2 17th
Upper Northeast (district 83)
Falls Creek 6.2 +0.2 12.2 1st 0.5 -0.1 -5.2 11th 89.6 98.0 average 91%
Mount Buller 6.4 +0.2 12.8 1st 0.8 -0.2 -5.1 11th 122.2 140.2 average 87%
Mount Hotham 5.0 +0.4 11.5 14th -0.1 0.0 -6.0 11th
Omeo 14.7 +0.2 22.2 1st 3.2 +0.4 -1.5 26th
East Gippsland (district 84)
Combienbar AWS 15.0 +0.6 25.1 3rd 8.2 +0.5 2.2 11th 52.4 62.2 average 84%
Gabo Island Lighthouse 17.7 +0.8 22.9 3rd 11.7 +0.5 7.6 11th 60.2 98.0 average 61%
Lakes Entrance (Eastern Beach Road) 18.3 +0.3 29.1 3rd 9.1 +0.5 3.4 26th 29.4 38.9 average 76%
Mallacoota 18.0 +0.4 24.3 3rd 8.9 -0.4 4.6 1st 64.8 82.0 average 79%
Mount Nowa Nowa 16.7 +0.8 26.5 3rd 9.0 +0.3 3.1 11th 52.4 56.5 average 93%
Orbost 18.8 +1.0 29.4 3rd 9.0 +0.6 3.8 11th 36.0 50.6 average 71%
Point Hicks (Lighthouse) 17.6 +0.6 29.6 3rd     6.4 12th 80.7 93.8 average 86%
West Gippsland (district 85)
Bairnsdale Airport 19.0 +1.4 28.8 3rd 7.0 +0.3 0.8 26th 35.4 44.1 average 80%
Corner Inlet (Yanakie) 16.6   24.1 3rd 9.1   2.1 26th 86.8
East Sale 18.2 +1.3 27.7 3rd 6.9 +0.6 0.5 26th 28.4 49.9 average 57%
East Sale Airport 18.3   28.2 3rd 7.1   1.2 26th 33.4
Morwell (Latrobe Valley Airport) 17.1 +0.2 26.7 3rd 6.8 +0.3 0.3 26th 52.8 53.9 average 98%
Mount Baw Baw 6.4 0.0 14.5 1st 1.5 -0.1 -3.7 11th
Mount Moornapa 16.2 +1.3 24.9 3rd 8.2 +0.3 3.4 11th 49.8 45.2 high 110%
Nilma North (Warragul) 16.4   27.0 3rd 7.4   0.2 26th 93.6
Pound Creek 17.2 +0.1 26.0 3rd 9.1 +1.0 0.8 14th 115.0 89.9 average 128%
Wilsons Promontory Lighthouse 15.9 +0.9 24.0 3rd 12.1 +1.0 7.6 11th 138.6 113.6 high 122%
Yarram Airport 18.0 +0.7 27.9 3rd 8.1 +1.4 0.6 26th 36.2 45.6 low 79%
East Central (district 86)
Cerberus 17.1 +0.5 23.6 1st 9.2 +0.8 1.6 26th 92.6 69.6 high 133%
Coldstream 17.1 +0.5 26.1 3rd 6.7 +1.1 -0.1 1st
Cranbourne Botanic Gardens 17.2 +0.7 24.5 3rd 9.2 +0.7 4.3 26th 87.5 66.1 high 132%
Essendon Airport 17.5 +1.2 24.2 3rd 9.5 +1.7 3.0 26th 56.0 48.4 average 116%
Ferny Creek 12.9   21.2 3rd 8.1   3.0 11th 161.4
Frankston AWS 16.5 +0.5 22.7 3rd 11.1 +0.5 6.4 26th
Melbourne (Olympic Park) 17.6   24.4 3rd 10.5   5.2 26th 65.6
Melbourne Airport 17.2 +0.5 24.7 3rd 8.9 +0.6 2.6 26th 56.4 39.3 high 144%
Moorabbin Airport 17.5 +0.5 24.9 3rd 10.1 +1.4 3.4 26th 63.8 68.9 average 93%
Rhyll 16.8 +0.5 22.1 3rd 11.4 +0.7 7.8 11th 83.0 73.6 average 113%
Scoresby Research Institute 17.2 +0.9 25.2 3rd 8.8 +0.5 2.3 26th 74.4 87.1 average 85%
Viewbank 17.6 +0.4 26.5 3rd 8.9 +1.0 3.7 1st 72.0 51.6 high 140%
Wonthaggi 17.2 +0.5 24.2 3rd 9.8 +1.1 3.8 14th 126.0 98.6 high 128%
West Central (district 87)
Avalon Airport 17.8 +0.5 25.0 3rd 9.0 +1.4 2.1 26th 57.8 36.0 high 161%
Breakwater (Geelong Racecourse) 17.7   24.8 2nd 9.6   2.4 26th 52.6
Laverton RAAF 17.5 +0.6 25.4 1st 9.5 +1.7 2.1 26th 51.2 45.8 average 112%
Sheoaks 15.5 -0.1 23.8 1st 8.1 +0.8 1.3 26th 70.0 34.4 v high 203%
North Central (district 88)
Castlemaine Prison 15.8 +0.1 23.1 2nd 6.4 +1.0 1.5 19th 97.3 56.8 high 171%
Eildon Fire Tower 13.3 0.0 22.4 3rd 6.9 +0.3 2.1 11th 65.0 55.3 average 118%
Lake Eildon 16.7 +0.5 25.3 3rd 5.9 -0.1 0.6 17th 86.0 78.2 average 110%
Mangalore Airport 17.1 +0.4 24.2 3rd 5.5 -0.6 -0.7 17th 59.6 53.1 average 112%
Maryborough 16.4 +0.2 22.9 2nd 6.7 +0.6 2.2 26th 58.8 49.0 average 120%
Redesdale 17.2 +1.1 24.1 2nd 4.9 -0.3 0.2 19th 71.0 55.6 average 128%
Wallan (Kilmore Gap) 13.6 +0.7 21.4 3rd 7.2 +0.3 3.5 11th 105.8 57.2 high 185%
Western Plains (district 89)
Ararat Prison 15.5 0.0 22.8 2nd 6.0 +0.4 1.0 9th 77.2 53.7 high 144%
Ballarat Aerodrome 13.9 +0.2 20.8 2nd 6.1 +0.4 0.6 30th 73.8 63.9 average 115%
Westmere 15.5 -0.3 23.6 2nd 7.5 +1.1 -0.9 26th 67.8 50.7 high 134%
West Coast (district 90)
Cape Nelson Lighthouse 16.3 +0.2 23.1 2nd 11.3 +0.5 7.1 26th 81.4 72.6 average 112%
Cape Otway Lighthouse 15.9 +0.3 22.6 2nd 11.2 +1.1 6.4 26th 112.0 91.2 high 123%
Casterton 16.1 -0.2 24.3 2nd 8.3 +1.1 0.6 31st 81.0 67.1 average 121%
Colac (Mount Gellibrand) 15.0 -0.1 23.4 1st 8.4 +0.4 3.0 30th 69.0 42.5 high 162%
Dartmoor 16.2   23.6 2nd 8.8   2.2 1st 101.2 85.1 high 119%
Hamilton Airport 14.9 -0.8 23.1 2nd 8.0 +1.4 2.0 26th 85.6 53.1 high 161%
Mortlake Racecourse 16.4 +0.2 24.8 2nd 7.7 +1.1 1.4 1st 104.4 53.8 v high 194%
Port Fairy AWS 16.9 +0.1 23.7 1st 10.4 +1.3 4.6 26th 94.2 69.3 high 136%
Portland (Cashmore Airport) 15.9 0.0 22.1 2nd 9.4 +1.0 1.4 26th 138.0 83.7 high 165%
Warrnambool Airport NDB 16.4 -0.1 24.1 2nd 8.9 +1.5 2.5 26th 99.4 72.4 high 137%

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 10 am on Friday 1 June 2018. 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

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