Australian Capital Territory in August 2018: Below average rainfall in low-lying regions

Below average rainfall was recorded in the low-lying regions of the ACT during August 2018. Daytime temperatures were slightly above average while night-time temperatures were slightly below average.

Below average rainfall

  • Low rainfall was recorded Canberra Airport and Tuggeranong, however average totals were recorded in the mountainous regions in the west of the Territory
  • Canberra Airport recorded 29.0 mm of rain for the month of August, which is about 63% of the mean August rainfall of 45.8 mm
  • Tuggeranong recorded 24.0 mm which is 51% of the average August rainfall of 47.1 mm
  • The wettest day occurred on the 4th when a cold front crossed the ACT and 13.8 mm was recorded at the Airport in the 24 hours to 9am

Slightly warmer days and slightly cooler nights

  • Canberra Airport reported a mean maximum temperature of 13.9 °C during August 2018, 0.7 °C above average but the coolest for August since 2010
  • The warmest day of the month was 3 August when it reached 19.5 °C at Canberra Airport
  • Mean minimum temperatures at Canberra Airport were slightly below (-0.2 °C) average, and 17 nights dropped below the frost threshold of 2 °C, which is around average for August but less than the 21 nights recorded last year

Canberra Airport

  • Total rainfall for Canberra Airport was 29.0 mm, which is 63% of the long-term average of 45.8 mm
  • The mean daily maximum temperature for Canberra Airport was 13.9 °C. The warmest day was 19.5 °C on the 3rd, and the coolest day was on the 7th when the temperature reached 9.7 °C
  • The mean daily minimum temperature for Canberra Airport was 0.8 °C. The coldest morning was -6.4 °C on the 30th, and the warmest morning was on the 1st when the minimum temperature was 7.6 °C

Further information

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Extremes in August 2018
Hottest day 19.5 °C at Canberra Airport on the 3rd
18.5 °C at Tuggeranong (Isabella Plains) AWS on the 3rd
17.6 °C at Canberra Airport on the 26th
Warmest days on average 13.9 °C at Canberra Airport
13.7 °C at Tuggeranong (Isabella Plains) AWS
2.5 °C at Mount Ginini AWS
Coolest days on average 2.5 °C at Mount Ginini AWS
13.7 °C at Tuggeranong (Isabella Plains) AWS
13.9 °C at Canberra Airport
Coldest day -3.2 °C at Mount Ginini AWS on the 19th
-2.4 °C at Mount Ginini AWS on the 7th
-1.7 °C at Mount Ginini AWS on the 18th
Coldest night -8.0 °C at Mount Ginini AWS on the 20th
-6.7 °C at Mount Ginini AWS on the 28th
-6.5 °C at Mount Ginini AWS on the 29th
Coolest nights on average -3.0 °C at Mount Ginini AWS
0.8 °C at Canberra Airport
0.8 °C at Tuggeranong (Isabella Plains) AWS
Warmest nights on average 0.8 °C at Canberra Airport
0.8 °C at Tuggeranong (Isabella Plains) AWS
-3.0 °C at Mount Ginini AWS
Warmest night 8.5 °C at Tuggeranong (Isabella Plains) AWS on the 1st
7.6 °C at Canberra Airport on the 1st
7.3 °C at Tuggeranong (Isabella Plains) AWS on the 16th
Warmest on average overall 7.3 °C at Canberra Airport
7.3 °C at Tuggeranong (Isabella Plains) AWS
-0.3 °C at Mount Ginini AWS
Coolest on average overall -0.3 °C at Mount Ginini AWS
7.3 °C at Canberra Airport
7.3 °C at Tuggeranong (Isabella Plains) AWS
Wettest overall 81.0 mm at Mount Ginini AWS
51.4 mm at Ginninderra (Charnwood (ACT))
29.2 mm at Canberra (Australian National Botanic Ga
Driest overall 24.0 mm at Tuggeranong (Isabella Plains) AWS
25.0 mm at Torrens (Darke St)
25.1 mm at Nicholls (Gungahlin Lakes)
Wettest day 19.8 mm at Ginninderra (Charnwood (ACT)) on the 4th
18.2 mm at Mount Ginini AWS on the 4th
16.4 mm at Canberra (Australian National Botanic Ga on the 4th
Strongest wind gust 83 km/h at Mount Ginini AWS on the 1st
83 km/h at Mount Ginini AWS on the 16th
81 km/h at Mount Ginini AWS on the 3rd
78 km/h at Mount Ginini AWS on the 31st




Summary statistics for August 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2018
Diff
from
average
Highest for
August
2018
Mean for
August
2018
Diff
from
average
Lowest for
August
2018
Total for
August
2018
Average
for
August
Rank of
August
2018
Fraction of
August
average
Canberra Airport 13.9 0.7 19.5 3rd 0.8 -0.2 -6.4 30th 29.0 45.8 low 63%
Mount Ginini AWS 2.5 -1.6 7.6 3rd -3.0 -1.0 -8.0 20th 81.0 88.0 average 92%
Tuggeranong (Isabella Plains) AWS 13.7 -0.4 18.5 3rd 0.8 -0.1 -6.1 30th 24.0 47.1 low 51%
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,
combined with the current site from March 2010 onwards.

Daily maximum temperatures for August 2018
12345678910111213141516171819202122232425262728293031
Canberra Airport15.414.319.512.815.013.79.712.113.715.616.411.713.816.416.013.813.411.210.611.512.814.012.014.916.117.614.012.013.014.812.1
Mount Ginini AWS3.25.17.60.04.8-0.7-2.4-0.15.04.94.1-1.10.26.73.71.90.4-1.7-3.21.7-0.91.8-0.33.84.95.85.23.45.87.00.6
Tuggeranong (Isabella Plains) AWS15.214.118.512.614.813.19.311.414.015.115.811.914.417.516.614.212.99.910.511.713.013.611.415.115.917.513.211.413.114.312.9
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 2018
12345678910111213141516171819202122232425262728293031
Canberra Airport7.6-3.8-3.63.7-1.01.22.42.61.6-2.50.41.42.42.85.66.5-5.5-0.52.7-5.72.61.7-1.54.14.94.60.2-3.4-5.0-6.43.6
Mount Ginini AWS-1.6-3.0-1.6-2.6-2.5-0.8-4.2-4.1-4.5-0.90.5-5.4-4.7-1.9-1.1-3.0-4.7-2.8-5.8-8.0-4.7-3.3-2.9-1.8-0.71.0-2.2-6.7-6.5-2.5-0.3
Tuggeranong (Isabella Plains) AWS8.5-2.8-3.92.5-1.01.02.72.90.3-3.01.0-0.20.7-1.75.57.3-5.2-0.32.9-5.43.6-1.20.24.47.16.30.50.0-3.6-6.12.4
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 2018
12345678910111213141516171819202122232425262728293031
Bruce (Australian Institute of Sport) - - - 14.8 5.6 - - - - - - - - - - 4.6
Canberra (Australian National Botanic Ga - - - 16.4 - 0.2 4.8 - - - - 3.2 - - - - - - 3.6 - 0.2 - - - - 0.8




Canberra Airport - - - 13.8 - - 6.6 - - 0.2 - 3.0 - - - - - - 3.4 - - - - - - 1.6 - - - - 0.4
Canberra Parliament House - - - 16.2 7.4 - - - 3.0

















Ginninderra (Charnwood (ACT)) - - - 19.8 - - 5.4 - - - - 3.2 - - 19.8 - - - 2.8 0.2 - - - - - - - - - - 0.2
Mount Ginini AWS - - - 18.2 - 0.2 12.4 8.6 3.4 - - 15.0 3.4 - - 0.4 - 1.4 13.6 0.4 1.0 2.6 0.2 - - - - - - - 0.2
Nicholls (Gungahlin Lakes) - - - 15.0 - 0.9 9.2























Torrens (Darke St) - - - - 16.8 - - - 4.2 - - - - - 1.8 0.2 - - - - - - 1.4 - - - - 0.6
Tuggeranong (Isabella Plains) AWS - - - 14.0 - - 2.4 - - - - 4.6 - - - - - - 2.0 0.4 - - - - - 0.4 - - - - 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, generally published on the first working day of each month, lists the main features of the weather in Australian Capital Territory 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 summary includes data from observing sites in or near the Australian Capital Territory “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 9 am on Monday 3 September 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

Media
(03) 9669 4057
Enquiries