Melbourne in August 2015: mostly dry month with below average daytime temperatures

There were strong contrasts in rainfall across the Melbourne metropolitan area in August, with rainfall above average in outer eastern suburbs, but well below average in the north and west. Maximum temperatures were below, while minimum temperatures were above the long-term monthly mean.

  • A cold start to the month
  • Some warm nights
  • Dry in northern and western suburbs

August rainfall across Melbourne was above average in outer eastern suburbs, but well below average in the north and west, with northern and western suburbs recording less than 60% of the long-term monthly mean. Melbourne (Olympic Park) recorded 18 days with rain and a monthly total of 38 mm, nearly half of which (17 mm) was recorded on the 28th in association with a complex low pressure system located off the southern New South Wales coast, which brought heavy rain to the central and eastern suburbs of Melbourne but little or no rain in the west. The wettest spot in the greater Melbourne area was Ferny Creek in the Dandenong Ranges, with 163 mm for the month and highest daily total of 52 mm.

Maximum temperatures were below the August average across the greater Melbourne area. Most days during the month saw cooler-than-average maximum temperatures, a result of the several cold fronts that crossed the city leaving the cold air in their wake. At Melbourne (Olympic Park) maximum temperatures recorded during the first 9 days of the month were all below 15 °C with the lowest maximum temperature (10.8 °C) recorded on the 3rd and 5th of August. The highest maximum temperature at the same site was 18.8 °C recorded on the 22nd, while in the greater Melbourne area it was 20.9 °C at Avalon Airport on the 21st.

Minimum temperatures during the month were generally above the long-term mean because of increased cloud cover. Particularly warm night-time temperatures were recorded on the 21st and 22nd of the month, due to the warm conditions brought by the northerly winds. On the 22nd Melbourne (Olympic Park) recorded 11.8 °C, the highest minimum temperature for the month in the greater Melbourne area.

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Extremes in August 2015
Hottest day 20.9 °C at Avalon Airport on the 21st
Warmest days on average 14.4 °C at Avalon Airport
Coolest days on average 9.2 °C at Ferny Creek
Coldest day 4.5 °C at Ferny Creek on the 3rd
Coldest night -1.2 °C at Coldstream on the 19th
Coolest nights on average 4.4 °C at Coldstream
Warmest nights on average 7.9 °C at Melbourne (Olympic Park)
Warmest night 11.8 °C at Melbourne (Olympic Park) on the 22nd
Warmest on average overall 10.9 °C at Melbourne (Olympic Park)
Coolest on average overall 6.9 °C at Ferny Creek
Wettest overall 162.8 mm at Ferny Creek
Driest overall 12.0 mm at Avalon Airport
Wettest day 51.8 mm at Ferny Creek on the 28th
Strongest wind gust 80 km/h at Melbourne Airport on the 1st

Record highest August daily rainfall
New record
(mm)
Old
record
Years of
record
Coldstream 42.8 on the 28th 30.0 on the 13th in 2002 21



Lowest August total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
August
Avalon Airport 12.0 7.8 in 1982* 42.9

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




Lowest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Laverton RAAF 13.8 13.7 in 1992 14.9
Cranbourne Botanic Gardens 13.3 13.2 in 1994 14.6



Summary statistics for August 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2015
Diff
from
average
Highest for
August
2015
Mean for
August
2015
Diff
from
average
Lowest for
August
2015
Total for
August
2015
Average
for
August
Rank of
August
2015
Fraction of
August
average
Avalon Airport 14.4 -1.1 20.9 21st 5.7 +0.2 0.2 16th 12.0 42.9 v low 28%
Bundoora (Latrobe University) 13.7 -1.2 18.5 22nd 6.6 +0.4 0.0 4th 56.5 56.5 average 100%
Cerberus 13.5 -1.2 17.5 21st 6.4 -0.3 2.1 16th 72.0 76.2 average 94%
Coldstream 13.4 -1.4 19.8 22nd 4.4 0.0 -1.2 19th 100.6 68.5 high 147%
Cranbourne Botanic Gardens 13.3 -1.3 17.7 21st 6.2 -0.3 3.1 4th 89.4 81.4 average 110%
Essendon Airport 13.8 -0.6 19.3 22nd 6.8 +1.2 2.2 4th 34.0 48.2 low 71%
Ferny Creek 9.2   15.4 22nd 4.6   0.5 4th 162.8
Laverton RAAF 13.8 -1.1 19.0 22nd 6.3 +0.8 0.6 4th 15.4 44.1 v low 35%
Melbourne (Olympic Park) 13.8   18.8 22nd 7.9   3.5 4th 38.2
Melbourne Airport 13.4 -1.1 19.1 22nd 6.3 +0.4 1.9 4th 19.8 45.1 low 44%
Moorabbin Airport 13.6 -1.3 19.1 21st 7.5 +0.6 3.7 4th 49.4 65.2 low 76%
Scoresby Research Institute 13.6 -0.6 19.2 22nd 6.3 -0.1 1.2 29th 79.4 79.8 average 99%
Viewbank 13.7 -1.5 19.4 22nd 6.5 +0.2 0.7 4th 46.0 54.6 average 84%

Daily maximum temperatures for August 2015
12345678910111213141516171819202122232425262728293031
Avalon Airport12.115.110.612.411.914.214.413.014.616.915.413.513.514.615.416.812.110.911.720.020.918.717.114.614.713.813.514.412.713.913.5
Bundoora (Latrobe University)14.210.310.911.512.012.511.712.715.814.413.813.015.314.916.711.811.013.317.018.518.516.013.913.816.211.312.911.713.1
Cerberus11.713.39.711.010.212.712.412.314.015.714.413.913.114.215.015.311.410.813.317.317.517.115.314.113.715.712.213.612.012.413.4
Coldstream11.113.29.29.711.412.611.710.910.915.213.714.812.715.715.215.411.49.014.016.218.419.817.414.913.016.410.913.810.614.213.4
Cranbourne Botanic Gardens10.913.09.611.010.212.811.211.713.515.414.213.412.714.015.015.011.410.913.117.117.717.516.313.913.015.411.513.411.612.512.7
Essendon Airport11.214.210.611.311.613.212.512.313.015.714.413.413.415.814.716.712.510.414.315.818.019.316.514.214.415.811.613.211.112.513.0
Ferny Creek7.08.44.55.65.67.67.57.78.410.79.610.18.310.710.510.76.76.59.012.713.915.412.910.58.912.48.49.46.69.89.4
Laverton RAAF11.414.410.611.711.614.012.912.213.516.115.114.013.314.615.616.912.010.212.117.517.619.015.813.413.714.512.314.312.112.112.8
Melbourne (Olympic Park)11.414.910.811.310.812.813.112.613.316.014.814.813.015.314.917.012.211.112.717.118.718.816.314.514.314.611.713.211.712.513.0
Melbourne Airport11.114.110.410.911.313.512.512.012.115.113.912.712.915.614.816.711.99.813.116.017.319.116.513.513.515.411.312.810.811.713.1
Moorabbin Airport11.213.89.711.210.612.612.512.114.115.714.513.512.514.214.316.311.710.712.617.919.117.514.914.613.816.411.513.912.313.412.2
Scoresby Research Institute10.813.69.59.910.212.611.911.612.215.914.214.313.514.515.316.111.710.614.516.417.919.216.814.613.416.211.213.511.614.012.8
Viewbank11.014.010.811.410.912.713.011.712.615.113.913.513.215.114.816.911.711.114.117.018.119.416.214.513.516.711.213.411.013.112.8
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 August 2015
12345678910111213141516171819202122232425262728293031
Avalon Airport5.25.86.33.16.85.95.06.35.66.66.17.95.96.96.00.28.43.10.72.710.26.04.94.78.89.06.07.22.37.15.4
Bundoora (Latrobe University)6.30.05.94.77.98.57.06.07.08.16.89.29.71.78.65.32.54.010.710.05.07.08.57.69.56.73.77.27.2
Cerberus5.55.25.53.86.86.48.15.96.37.78.49.68.08.34.62.17.44.32.72.28.77.85.42.98.49.09.39.85.58.06.3
Coldstream0.55.06.3-0.43.71.87.68.22.12.36.65.35.18.08.7-0.85.23.0-1.20.54.77.43.07.38.16.08.04.1-0.44.55.7
Cranbourne Botanic Gardens5.25.24.43.15.85.97.97.84.67.96.98.07.37.98.53.27.13.63.24.68.810.06.84.97.76.88.75.23.87.25.5
Essendon Airport7.36.26.12.26.84.86.78.27.17.86.67.46.58.99.43.38.34.74.35.410.19.95.77.99.07.59.25.93.87.56.7
Ferny Creek4.02.83.10.52.72.25.55.85.25.54.36.04.75.96.84.84.12.52.34.57.29.27.24.25.25.57.45.12.04.23.3
Laverton RAAF6.65.96.50.66.44.03.96.75.78.27.18.55.37.07.42.18.61.55.44.311.08.04.96.410.08.78.17.33.67.57.2
Melbourne (Olympic Park)6.57.87.33.56.67.19.08.87.78.37.89.38.410.410.04.76.86.15.56.110.911.87.98.59.59.29.88.16.37.98.1
Melbourne Airport7.25.35.91.96.34.16.08.16.67.65.77.06.48.29.24.07.43.55.23.89.810.24.76.58.46.78.26.43.26.66.4
Moorabbin Airport6.86.87.83.76.27.48.68.55.38.28.09.98.29.79.73.88.26.45.95.010.811.25.75.68.57.89.78.24.79.08.5
Scoresby Research Institute6.85.26.82.75.74.88.28.06.57.67.08.36.88.89.72.37.05.01.53.810.39.14.75.88.07.69.34.91.26.56.9
Viewbank4.36.56.40.73.75.58.18.65.96.87.88.57.49.79.81.64.85.23.13.410.310.85.26.88.48.09.46.93.57.37.6
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 August 2015
12345678910111213141516171819202122232425262728293031
Avalon Airport - - 2.2 - 0.4 0.2 0.6 0.4 - 0.4 1.4 0.6 1.8 - 1.0 - 1.2 0.2 - - - - - 0.6 0.4 - - 0.2 - 0.4 -
Bundoora (Latrobe University) 0.9 9.2 - 2.6 3.6 5.4 1.0 - 0.2 0.2 - 1.0 - 1.4 - 2.2 1.2 - - - - - - - - 0.6 20.2 2.2 4.6 -
Cerberus 6.0 - 10.6 1.0 6.4 14.4 2.6 0.6 - 1.0 2.6 - 1.8 0.2 1.2 - 7.4 3.4 0.2 0.2 - - - - - - - 12.0 0.2 0.2 -
Coldstream 4.2 0.6 11.4 2.0 2.2 5.2 9.0 1.2 0.4 - 0.6 - 3.8 - 1.0 - 3.4 5.8 - 0.2 - - - - - 0.2 3.6 42.8 1.2 1.6 0.2
Cranbourne Botanic Gardens 3.7 0.1 10.0 2.2 9.8 8.4 2.6 3.6 - 0.8 0.4 - 1.6 - 1.0 - 6.8 2.4 0.4 0.2 - - - - 0.6 1.8 30.4 0.5 2.1 -
Essendon Airport 1.0 - 7.2 - 3.2 1.0 2.2 1.6 - 0.2 0.4 - 0.8 - 0.6 - 1.6 0.2 - - - - - - - - 1.6 7.0 1.8 3.6 -
Ferny Creek 4.2 1.6 12.2 6.0 5.4 12.2 18.4 5.0 - 0.2 0.4 - 5.2 0.6 4.4 - 9.4 11.6 0.8 - - - - - - 0.2 3.8 51.8 2.4 7.0 -
Laverton RAAF 0.4 - 4.4 0.6 1.2 0.6 1.0 0.8 - 0.2 - - 0.4 - 0.6 - 1.8 - - - - - - - - - - 1.4 0.6 1.4 -
Melbourne (Olympic Park) 0.2 - 6.4 - 1.0 1.6 1.4 0.4 - 0.2 0.8 - 0.2 - 0.4 0.2 2.4 0.6 - - - - - - - 0.2 0.8 17.4 1.8 2.2 -
Melbourne Airport 0.4 - 2.6 - 1.0 0.4 0.4 0.6 - 0.6 0.2 - 1.6 - 0.4 - 2.8 - 0.4 - - - - - - - 1.2 3.0 1.8 2.4 -
Moorabbin Airport 1.6 - 4.8 1.6 2.8 4.6 3.0 - - 1.2 - - 2.4 - 1.2 - 3.4 1.0 - - - - - - 0.4 0.4 1.8 17.6 0.2 1.4 -
Scoresby Research Institute 1.6 0.4 7.6 1.2 3.0 5.0 4.2 1.0 0.2 0.4 0.4 - 4.4 - 1.2 0.2 7.4 8.0 - - - - - - - - 0.6 31.0 0.8 0.8 -
Viewbank 0.4 0.2 7.4 - 2.6 2.6 3.2 1.2 - 0.2 0.2 - 0.8 0.2 2.2 - 2.0 0.6 - 0.2 - - - - - - 0.8 18.0 1.0 2.2 -
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

The Monthly climate summary lists 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.

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 Tuesday 1 September 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

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