Canberra in August 2015: A warm, wet end to winter

Rainfall was above average in Canberra during August, with two events bringing more than 20 mm of rain. Daytime temperatures were above average, and a spell of warm nights towards the end of the month was the longest August warm period since 1998.

  • Above average rainfall, wettest August since 2004
  • Above average mean maximum temperatures
  • Average minimum temperatures
  • Longest spell of nights above 5 °C since August 1998

Canberra recorded well above average rainfall during August, which was the wettest for the airport since 2004. There were eight days with at least 1 mm of rain, normal for Canberra, but two recorded at least 20 mm. A cold front and surface trough produced 31.4 mm of rain at the airport on the 2nd, with 40.4 mm at Torrens - its wettest August day in over 30 years. A low pressure system also produced 22.6 mm at the airport and 36 mm at Tharwa as it crossed the state on the 25th.

Maximum temperatures were 0.7 °C warmer than average, with daytime temperatures as high as 21 °C on the 22nd, the warmest winter day since 3 August 2011. The mean minimum temperature was equal to the historical average, with cool nights in the middle of the month including light snowfall in the city on the 12th, but five consecutive nights above 5 °C between the 23rd and 27th; this is the longest period of warm nights since 16-22 August 1998.

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Extremes in August 2015
Hottest day 21.0 °C at Canberra Airport on the 22nd
Warmest days on average 13.7 °C at Canberra Airport
Coolest days on average 3.2 °C at Mount Ginini AWS
Coldest day -1.7 °C at Mount Ginini AWS on the 5th
Coldest night -8.2 °C at Mount Ginini AWS on the 4th
Coolest nights on average -2.3 °C at Mount Ginini AWS
Warmest nights on average 1.2 °C at Tuggeranong (Isabella Plains) AWS
Warmest night 10.8 °C at Tuggeranong (Isabella Plains) AWS on the 23rd
Warmest on average overall 7.4 °C at Canberra Airport
Coolest on average overall 0.5 °C at Mount Ginini AWS
Wettest overall 88.8 mm at Torrens (Darke St)
Driest overall 66.8 mm at Canberra Airport
Wettest day 40.4 mm at Torrens (Darke St) on the 2nd
Strongest wind gust 93 km/h at Mount Ginini AWS on the 1st

Record highest August daily rainfall
New record
(mm)
Old
record
Years of
record
Torrens (Darke St) 40.4 on the 2nd 39.8 on the 18th in 2011 31

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
Canberra Airport 13.7 +0.7 21.0 22nd 1.0 +0.0 -5.3 4th 66.8 46.8 high 143%
Mount Ginini AWS 3.2 -1.1 9.6 22nd -2.3 -0.4 -8.2 4th 88.2 83.6 average 106%
Tuggeranong (Isabella Plains) AWS 13.4 -0.7 20.8 22nd 1.2 +0.3 -4.4 4th 79.2 48.4 high 164%
Note: Observations for “Canberra Airport” are taken from the current site (Bureau number 070351), which opened in late 2008.
Comparisons are made against data from the previous site Canberra Airport Comparison (070014), which ran from 1939 to 2010.

Daily maximum temperatures for August 2015
12345678910111213141516171819202122232425262728293031
Canberra Airport15.114.611.18.910.112.213.013.413.314.413.67.512.215.415.115.312.512.313.015.617.721.016.511.610.514.915.815.214.014.515.0
Mount Ginini AWS3.62.5-1.4-0.8-1.7-1.51.55.23.21.92.1-0.80.15.25.13.80.03.54.77.37.89.65.12.70.63.83.75.74.35.97.0
Tuggeranong (Isabella Plains) AWS15.312.811.58.89.812.812.813.312.813.813.46.313.115.515.116.612.311.912.515.417.020.815.811.110.014.214.814.114.013.315.0
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
Canberra Airport2.37.43.8-5.30.0-0.1-3.5-3.0-4.72.73.1-3.50.5-2.8-1.60.53.3-4.1-3.8-1.8-2.52.710.77.46.57.26.65.64.0-2.9-3.0
Mount Ginini AWS-1.70.6-3.9-8.2-7.2-5.8-3.6-3.8-2.5-3.1-2.3-2.4-4.4-3.50.1-0.6-2.4-6.5-4.2-2.10.83.53.02.1-1.7-0.90.5-1.6-2.7-3.1-2.4
Tuggeranong (Isabella Plains) AWS2.87.94.9-4.4-1.7-2.4-4.3-2.6-4.12.43.5-3.2-2.8-3.9-0.75.6-0.6-3.5-3.10.8-2.85.010.88.96.26.78.82.83.0-1.7-1.3
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
Canberra (Australian National Botanic Ga - 33.2 - - - - - - - - - - 4.8 - - - - 0.2 - - - 2.0 - - 25.4 3.4 1.0
Canberra Airport - 31.4 1.2 - - - - 0.2 - - -
4.0 - - - - - - 0.2 - 1.4 0.2 - 22.6 2.6 1.2 - 1.8 - -
Mount Ginini AWS - 25.8 3.0 - 0.8 3.6 - - - - - - 10.2 - - - 0.2 1.6 - - - 2.0 0.2 0.8 23.8 5.6 4.2 6.0 - - 0.4
Nicholls (Gungahlin Lakes) - 27.4 1.2 - - - - - - - - - 6.4 - - - - - - - - - - 2.0 30.4





Tharwa General Store - 24.2 1.0 - - - - - - - - - 4.2 - - - - - - - - 1.2 - - 36.0 10.4 4.0 0.6


Torrens (Darke St) - 40.4 1.6 - 0.2 - - 0.2 - - - 4.4 - - - - 0.2 - - - 3.6 - - 27.8 3.0 2.4 0.8 4.0 0.2
Tuggeranong (Isabella Plains) AWS - 18.0 21.2 - - - - - - - - - 4.0 - - - - - - - - 2.2 - - 24.6 5.6 1.0 2.4 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

The Monthly climate summary lists the main features of the weather in Canberra 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 9 am 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.

Observations for “Canberra Airport” are taken from the current site (Bureau number 070351), which opened in late 2008.
Comparisons are made against data from the previous site Canberra Airport Comparison (070014), which ran from 1939 to 2010.

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
(03) 9669 4057
Enquiries