Melbourne in April 2015: a cool month after a warm start

Several sites in and around Melbourne were over 30 C on the 1st of April, and into the high 20s on the 15th, but the final two weeks of the month brought cool days. Most sites had mean maximum temperatures about half to one degree below average.

There were plenty of relatively mild nights right through the month, with the mornings of the 15th and 16th mostly above 14 C. But some very cool mornings, notably the 3rd, 13th, 21st and 29th, ensured mean minimum temperatures were below average for the month, typically by between half and one degree.

Rain was close to average for the month (but somewhat below average at most sites).There were several quite wet days, such as Bundoora recording 19 mm in the 24 hours to 9 am on the 8th, and Ferny Creek recording 25 mm in the 24 hours to 9 am on the 19th.The most exciting thing that happened

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Extremes in April 2015
Hottest day 32.1 C at Avalon Airport on the 1st
Warmest days on average 19.8 C at Coldstream
Coolest days on average 15.4 C at Ferny Creek
Coldest day 9.5 C at Ferny Creek on the 19th
Coldest night 0.1 C at Coldstream on the 3rd
Coolest nights on average 6.6 C at Coldstream
Warmest nights on average 10.6 C at Melbourne (Olympic Park)
Warmest night 15.7 C at Ferny Creek on the 1st
Warmest on average overall 14.9 C at Melbourne (Olympic Park)
Coolest on average overall 11.8 C at Ferny Creek
Wettest overall 109.4 mm at Ferny Creek
Driest overall 34.2 mm at Laverton RAAF
Wettest day 25.2 mm at Ferny Creek on the 19th
Strongest wind gust 78 km/h at St Kilda Harbour - RMYS on the 19th




Summary statistics for April 2015
Maximum temperatures
(C)
Minimum temperatures
(C)
Rainfall
(millimetres)
Mean for
April
2015
Diff
from
average
Highest for
April
2015
Mean for
April
2015
Diff
from
average
Lowest for
April
2015
Total for
April
2015
Average
for
April
Rank of
April
2015
Fraction of
April
average
Avalon Airport 19.3 -1.0 32.1 1st 9.1 -0.5 3.8 13th 49.4 37.2 high 133%
Bundoora (Latrobe University) 19.1 -1.4 30.1 1st 9.1 -0.7 3.5 30th 63.7 54.7 average 116%
Cerberus 18.7 -1.0 27.6 15th 8.9 -1.1 1.8 13th 36.0 63.2 average 57%
Coldstream 19.8 -0.6 30.6 1st 6.6 -0.2 0.1 3rd 58.6 60.9 average 96%
Cranbourne Botanic Gardens 19.2 -0.7 28.9 1st 9.3 -1.0 3.9 21st 53.3 70.6 average 75%
Essendon Airport 19.5 -0.6 29.9 1st 9.3 -0.6 3.7 30th 46.8 54.4 average 86%
Ferny Creek 15.4   24.5 1st 8.2   4.9 20th 109.4
Laverton RAAF 19.2 -1.0 31.0 1st 9.6 -0.3 4.1 30th 34.2 45.2 average 76%
Melbourne (Olympic Park) 19.2   29.0 1st 10.6   6.4 30th 36.8
Melbourne Airport 19.4 -0.9 30.8 1st 8.9 -1.3 3.9 21st 40.2 43.6 average 92%
Moorabbin Airport 19.3 -0.8 30.3 1st 9.5 -0.9 3.9 21st 49.0 62.2 average 79%
Scoresby Research Institute 19.6 -0.4 29.6 1st 8.6 -1.5 2.7 20th 52.8 67.5 average 78%
Viewbank 19.7 -1.6 29.9 1st 9.0 -1.0 3.5 30th 44.0 56.6 average 78%

Daily maximum temperatures for April 2015
123456789101112131415161718192021222324252627282930
Avalon Airport32.118.719.822.318.118.018.119.019.319.921.119.817.422.728.619.316.822.315.416.618.319.219.619.614.616.016.016.916.617.9
Bundoora (Latrobe University)30.117.220.319.619.816.618.219.019.524.218.821.524.028.017.916.521.013.216.217.319.119.520.514.014.215.316.016.219.5
Cerberus27.217.118.623.419.617.516.518.419.619.620.117.920.520.327.618.217.119.815.216.217.418.917.719.716.315.514.915.816.218.4
Coldstream30.618.420.525.922.118.815.218.019.820.924.120.022.923.728.220.217.119.112.816.617.819.222.521.014.214.315.816.818.620.3
Cranbourne Botanic Gardens28.917.019.022.719.818.418.719.822.317.921.022.828.016.819.813.615.717.219.118.219.615.814.615.817.018.5
Essendon Airport29.917.920.523.820.219.217.317.819.719.424.919.321.224.527.518.016.521.815.116.117.619.918.521.114.615.114.916.617.019.6
Ferny Creek24.513.415.420.117.015.011.314.415.016.419.715.119.319.124.014.715.315.29.512.013.114.616.215.611.810.89.812.314.115.8
Laverton RAAF31.017.719.522.219.419.217.917.719.019.322.318.818.525.128.518.316.322.215.216.117.218.917.720.914.615.415.416.016.418.3
Melbourne (Olympic Park)29.017.220.923.518.518.417.317.719.118.723.718.319.124.727.617.817.121.914.716.217.719.519.221.115.015.415.116.017.119.6
Melbourne Airport30.817.919.824.820.617.716.917.919.019.524.718.821.624.927.318.416.121.814.215.817.618.517.321.113.916.215.916.017.119.3
Moorabbin Airport30.317.820.622.518.318.318.118.720.019.920.319.619.424.628.117.518.020.914.317.217.919.018.619.815.715.715.816.816.418.4
Scoresby Research Institute29.617.920.425.120.418.915.919.019.820.523.619.623.023.128.318.117.620.313.716.517.619.420.120.314.114.515.715.917.919.8
Viewbank29.917.520.825.920.120.016.418.219.720.724.720.222.624.228.618.416.821.313.615.917.519.420.620.614.314.515.015.318.020.4
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 April 2015
123456789101112131415161718192021222324252627282930
Avalon Airport9.610.39.58.18.26.99.710.59.88.09.112.43.89.514.713.69.812.37.76.06.26.211.613.510.79.48.96.77.44.1
Bundoora (Latrobe University)12.112.04.56.49.610.911.06.46.59.811.74.210.514.015.07.811.48.35.04.58.912.513.610.89.410.09.14.83.5
Cerberus10.313.15.56.57.78.66.212.75.25.18.410.71.810.812.814.26.311.69.49.03.09.210.114.111.412.010.97.610.92.2
Coldstream8.010.80.11.05.99.06.29.12.22.06.28.41.06.212.815.54.39.27.80.60.44.413.411.710.810.69.98.10.40.9
Cranbourne Botanic Gardens11.811.74.97.511.48.89.98.59.610.45.713.014.910.67.05.53.97.611.913.911.711.19.46.75.5
Essendon Airport12.810.96.17.87.99.010.110.67.16.49.312.75.211.414.314.48.912.48.06.45.39.012.012.710.69.510.07.75.33.7
Ferny Creek15.77.86.48.111.56.78.37.77.77.69.38.05.37.611.712.07.49.25.34.96.17.710.311.38.77.57.56.26.07.8
Laverton RAAF11.911.311.56.46.87.710.011.07.78.011.013.44.210.414.414.39.112.48.39.54.38.113.411.710.89.69.97.68.14.1
Melbourne (Olympic Park)13.312.88.08.510.211.212.413.38.78.611.612.17.310.513.915.610.113.59.77.06.59.112.214.411.610.410.510.17.46.4
Melbourne Airport14.010.25.47.56.27.59.010.07.07.09.913.64.810.815.214.28.011.97.54.73.96.911.311.810.29.19.57.95.65.4
Moorabbin Airport12.113.16.17.211.610.39.212.96.16.69.510.94.89.614.114.68.211.68.74.43.97.411.913.912.211.411.48.46.75.3
Scoresby Research Institute12.611.73.96.210.48.810.311.55.15.38.99.43.88.813.014.86.310.67.62.73.37.612.513.311.611.510.49.23.64.4
Viewbank11.111.84.25.78.410.610.511.57.26.210.912.34.28.612.715.18.29.78.54.93.68.312.813.810.99.99.89.04.73.5
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 April 2015
123456789101112131415161718192021222324252627282930
Avalon Airport - - - - - - - 4.2 - - - - - 2.0 8.6 0.2 - 5.8 2.6 1.8 - - - - 10.0 13.6 0.2 0.4 - -
Bundoora (Latrobe University) - 0.4 - - - - - 19.0 - - - - - 0.9 1.8 - - 4.2 8.4 4.4 - - - - 3.8 12.2 3.8 4.8 - -
Cerberus - 1.8 - - - - - 7.2 - - - - - 1.2 2.4 0.4 - 4.8 5.4 0.4 - - - 0.4 6.4 0.4 1.8 3.4 - -
Coldstream - 2.4 0.2 - - - - 9.4 1.0 - - - - 0.2 2.4 - - 11.6 8.0 8.0 - - - - 3.2 7.2 4.2 0.6 0.2 -
Cranbourne Botanic Gardens - 1.8 - - - 1.8 - 10.0 - - - - - 1.0 8.4 0.4 5.0 12.4 1.0 - - 0.2 - 3.0 3.7 2.2 2.4 -
Essendon Airport 0.2 0.4 - - - - - 11.0 - - - - - 2.0 1.8 - - 3.8 6.8 3.6 - - - - 5.6 10.4 0.2 0.8 0.2 -
Ferny Creek - 13.0 - - - - - 15.4 2.4 - - - - 1.0 2.2 0.2 1.0 11.8 25.2 8.2 - - 0.6 - 2.4 9.2 14.2 2.4 0.2 -
Laverton RAAF - - - - - - - 8.4 - - - - - 1.6 4.2 - - 3.6 4.4 0.6 - - - - 6.0 4.6 0.2 0.4 0.2 -
Melbourne (Olympic Park) - 0.2 - - - - - 5.6 - - - - - 1.6 2.4 - - 3.6 6.4 1.4 - - - - 3.0 7.0 4.0 1.6 - -
Melbourne Airport - 0.6 - - - - - 9.4 - - - - - 1.2 2.0 - - 2.6 4.2 1.0 - - 6.6 0.2 4.2 6.6 - 1.6 - -
Moorabbin Airport - 1.6 - - - - - 6.2 - - - - - 1.2 6.8 1.2 - 5.0 10.4 2.8 - - - - 6.6 2.4 0.8 3.8 0.2 -
Scoresby Research Institute - 6.8 0.2 - - 0.2 - 10.2 0.4 - - - - 1.0 2.6 0.2 1.0 7.0 6.8 4.4 - - - - 0.6 3.4 5.0 2.8 - 0.2
Viewbank - 0.2 - - - - - 7.2 - 0.2 - - - 0.6 2.0 0.2 - 4.6 9.8 3.8 - - - - 1.6 6.0 4.4 3.0 0.4 -
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 10 am on Friday 1 May 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.

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