Melbourne in May 2015: rainfall below average

Generally average to below-average rainfall across Melbourne during May. Night-time temperatures were warmer than average.

  • Dry start and end of the month
  • Mostly average day-time temperatures
  • Coldest night at Coldstream with -1.7 °C

May started with maximum temperatures above 23 °C recorded at several sites across the wider Melbourne area. The passage of a series of cold fronts, with the first one on the 5th, brought cooler conditions that persisted for the most of the remaining part of the month. At Melbourne (Olympic Park) the highest maximum temperature for the month, 23.1 °C, was recorded on the 1st and the lowest maximum temperature, 12.8 °C was recorded on 13 May.

Minimum temperatures during the month were generally above the long-term average. However, high pressure systems that moved from the Bight across the State, resulted in clear skies and low minimum temperatures, most notably on the 26th, when Melbourne (Olympic Park) recorded 5.4 °C, its lowest value for this month.

The city recorded 37.6 mm of rainfall for the month, with strongest falls registered on 10th, 13th and 21st, associated with the cold fronts that moved over the city.

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Extremes in May 2015
Hottest day 23.8 °C at Laverton RAAF on the 4th
Warmest days on average 17.2 °C at Laverton RAAF
Coolest days on average 12.5 °C at Ferny Creek
Coldest day 7.7 °C at Ferny Creek on the 13th
Coldest night -1.7 °C at Coldstream on the 26th
Coolest nights on average 6.6 °C at Coldstream
Warmest nights on average 9.8 °C at Melbourne (Olympic Park)
Warmest night 13.6 °C at Melbourne (Olympic Park) on the 20th
Warmest on average overall 13.5 °C at Melbourne (Olympic Park)
Coolest on average overall 9.9 °C at Ferny Creek
Wettest overall 162.2 mm at Ferny Creek
Driest overall 21.2 mm at Avalon Airport
Wettest day 39.6 mm at Ferny Creek on the 21st
Strongest wind gust 87 km/h at Avalon Airport on the 5th




Summary statistics for May 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
May
2015
Diff
from
average
Highest for
May
2015
Mean for
May
2015
Diff
from
average
Lowest for
May
2015
Total for
May
2015
Average
for
May
Rank of
May
2015
Fraction of
May
average
Avalon Airport 17.1 -0.1 23.6 2nd 8.2 +0.7 1.4 26th 21.2 34.9 low 61%
Bundoora (Latrobe University) 16.7 0.0 22.5 1st 8.6 +0.6 2.0 26th 33.4 51.0 low 65%
Cerberus 16.5 -0.1 21.8 4th 8.9 +0.5 1.2 26th 68.0 68.1 average 100%
Coldstream 16.6 0.0 23.0 1st 6.6 +1.1 -1.7 26th 85.0 65.7 high 129%
Cranbourne Botanic Gardens 16.4 0.0 22.5 4th 8.6 +0.1 3.9 24th 63.2 63.5 average 100%
Essendon Airport 17.0 +0.8 22.8 1st 8.6 +0.8 2.8 26th 46.0 48.7 average 94%
Ferny Creek 12.5   18.3 2nd 7.3   1.7 13th 162.2
Laverton RAAF 17.2 +0.3 23.8 4th 8.2 +0.4 3.0 24th 27.8 46.0 low 60%
Melbourne (Olympic Park) 17.1   23.1 1st 9.8   5.4 26th 37.6
Melbourne Airport 16.9 +0.3 22.5 4th 8.2 -0.1 3.3 25th 24.8 39.2 average 63%
Moorabbin Airport 17.0 0.0 23.2 1st 9.2 +0.6 3.4 26th 50.0 69.4 low 72%
Scoresby Research Institute 16.6 +0.3 22.6 1st 8.5 +0.3 0.9 24th 73.2 87.8 average 83%
Viewbank 16.8 -0.4 23.0 1st 8.4 +0.6 2.4 26th 46.6 51.9 average 90%

Daily maximum temperatures for May 2015
12345678910111213141516171819202122232425262728293031
Avalon Airport20.723.618.723.216.516.915.016.319.415.915.915.413.316.714.814.618.320.417.318.014.814.513.413.015.814.320.821.815.816.916.7
Bundoora (Latrobe University)22.521.618.521.816.816.015.315.618.415.915.514.013.418.219.519.015.615.512.313.413.517.215.615.017.818.014.916.716.5
Cerberus21.621.619.021.814.915.615.416.117.315.515.515.813.515.613.915.519.819.416.317.314.614.113.013.916.615.618.219.915.015.514.6
Coldstream23.022.419.521.417.516.014.214.518.115.815.815.710.613.114.618.219.419.117.118.512.114.514.915.715.515.017.618.815.316.116.1
Cranbourne Botanic Gardens21.821.918.922.516.415.914.214.317.214.415.414.912.814.913.016.920.119.715.216.813.012.814.116.916.518.014.615.915.3
Essendon Airport22.822.018.822.117.416.714.916.719.415.716.316.612.614.413.918.020.019.715.517.412.415.013.517.316.316.017.719.515.317.017.2
Ferny Creek18.318.315.917.411.711.09.99.913.110.211.811.17.79.99.213.915.915.113.913.99.310.210.413.413.413.314.214.910.211.89.8
Laverton RAAF23.123.218.023.817.617.115.416.419.115.615.816.213.115.114.115.321.020.816.917.913.014.013.514.617.316.019.921.415.317.416.8
Melbourne (Olympic Park)23.122.218.222.318.116.215.615.918.716.615.917.412.814.614.516.220.520.416.218.113.614.113.315.617.115.618.719.715.817.316.8
Melbourne Airport22.522.518.622.516.816.315.016.218.915.715.416.412.415.413.718.319.720.015.418.212.013.713.217.016.315.417.719.516.016.516.5
Moorabbin Airport23.222.217.822.517.716.614.715.720.015.316.516.012.514.514.915.820.319.816.117.914.114.314.114.017.916.418.619.715.217.216.1
Scoresby Research Institute22.622.018.922.016.415.014.114.918.014.915.916.111.614.013.717.920.319.516.417.513.113.913.916.316.415.818.419.114.516.214.7
Viewbank23.021.718.622.417.516.014.715.718.516.015.616.512.113.714.118.119.919.716.017.812.413.814.216.715.914.218.518.614.817.016.7
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily minimum temperatures for May 2015
12345678910111213141516171819202122232425262728293031
Avalon Airport5.79.57.15.310.510.09.49.411.612.911.311.65.46.110.410.32.44.77.310.89.58.39.64.94.31.47.311.17.37.110.8
Bundoora (Latrobe University)4.89.18.25.013.08.07.09.311.912.011.712.010.010.14.44.310.512.39.08.810.44.26.02.06.811.57.29.010.5
Cerberus3.810.09.04.811.010.610.110.412.012.611.412.56.48.711.910.03.33.47.712.410.410.310.16.74.31.27.311.89.210.811.5
Coldstream1.46.85.74.110.18.48.58.811.711.510.811.74.95.97.88.70.80.15.96.99.47.28.90.22.6-1.73.712.71.86.911.5
Cranbourne Botanic Gardens6.910.49.58.08.08.89.210.111.511.210.611.04.98.710.38.54.55.99.112.09.39.13.95.53.97.78.89.911.4
Essendon Airport5.513.07.14.911.68.38.09.311.412.011.012.15.56.410.410.45.84.611.211.58.88.79.85.15.52.89.412.26.69.09.6
Ferny Creek10.713.18.78.19.95.74.15.77.08.97.58.61.74.07.06.06.58.411.010.26.46.75.62.57.06.99.310.45.06.98.1
Laverton RAAF5.311.56.65.29.49.17.28.511.712.211.511.95.26.910.710.53.43.210.112.49.610.39.93.05.93.37.210.65.98.68.8
Melbourne (Olympic Park)7.911.69.77.59.29.510.310.512.812.812.412.86.37.311.511.37.47.29.913.610.39.110.46.07.45.47.913.19.511.012.3
Melbourne Airport4.911.67.56.011.58.17.98.211.211.810.211.65.36.410.410.15.95.511.111.28.58.39.13.43.34.58.811.56.06.98.7
Moorabbin Airport6.110.38.76.211.59.510.110.612.712.011.912.55.78.210.110.25.14.712.213.010.77.29.94.36.43.48.911.19.010.612.0
Scoresby Research Institute5.010.87.75.711.39.37.98.711.711.711.512.25.17.410.09.35.96.210.612.49.16.59.20.94.64.37.912.16.010.511.6
Viewbank5.39.610.04.79.39.08.79.711.811.911.512.15.56.49.910.15.44.17.312.79.37.89.53.45.72.44.811.78.710.311.6
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily rainfall for May 2015
12345678910111213141516171819202122232425262728293031
Avalon Airport - - - - 1.8 0.2 2.0 - - 3.4 1.6 - 2.0 0.8 1.8 1.6 - 0.4 0.2 2.4 2.2 0.6 - - - - 0.2 - - - -
Bundoora (Latrobe University) - - - - 1.8 1.2 2.6 0.2 - 14.4 2.2 0.4







10.6









Cerberus 0.2 - - - 4.0 7.2 0.6 0.2 - 17.6 9.4 0.2 11.6 1.6 1.4 1.0 - 0.2 - 7.4 2.6 0.2 0.2 - - - 0.2 0.8 1.4 - -
Coldstream - - - - 0.6 2.2 3.4 0.8 - 10.4 13.0 0.8 22.4 18.4 5.2 0.2 - - 0.2 0.4 6.4 0.2 - - - - - 0.2 0.2 - -
Cranbourne Botanic Gardens 0.2 - 0.1 0.2 2.0 0.6 3.2 2.0 - 10.7 9.4 1.6 10.8 4.2 5.2 1.7 0.2 - 0.2 8.6 1.8 0.3 - - - 0.2 - - - -
Essendon Airport - - - - 2.2 1.4 2.6 0.2 - 9.8 2.4 - 11.2 2.0 3.6 0.2 - - - 2.8 7.0 0.6 - - - - - - - - -
Ferny Creek - - - - 1.4 3.0 7.6 2.6 0.2 24.0 16.8 0.2 20.8 26.0 10.0 3.0 - 0.2 - 5.2 39.6 0.6 - 0.2 - - - - 0.6 - 0.2
Laverton RAAF 0.2 - - - 2.6 0.8 1.6 - - 5.6 0.4 0.2 4.6 2.0 3.6 - - 0.2 0.4 2.4 1.4 1.8 - - - - - - - - -
Melbourne (Olympic Park) - - - - 0.6 1.4 2.2 0.2 - 8.6 2.6 - 6.8 4.4 1.8 - - - - 2.4 6.2 0.4 - - - - - - - - -
Melbourne Airport - - - - 3.6 0.6 0.2 0.8 - 5.6 2.8 0.2 1.0 1.0 3.4 - 0.2 - - 2.2 2.4 0.8 - - - - - - - - -
Moorabbin Airport - - - - 1.0 0.8 1.4 3.6 - 12.4 2.0 - 10.4 7.4 3.0 - - - - 4.6 2.6 0.4 - - - - 0.2 - - - 0.2
Scoresby Research Institute - - - - 0.6 2.0 4.2 0.8 - 18.0 6.4 - 11.6 15.4 1.6 0.6 - 0.2 - 4.4 6.8 - - - - - 0.4 - - - 0.2
Viewbank - - - - 0.8 1.2 2.6 0.4 - 10.4 4.2 - 7.2 4.2 2.8 - - 0.2 - 2.6 9.2 0.6 - - - - 0.2 - - - -
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Melbourne 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.

A Climate Summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 12 pm on Monday 1 June 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
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Enquiries