Australian Capital Territory in July 2018: drier than average with cold nights and relatively warm days

Rainfall was below average in the Australian Capital Territory (ACT) during July 2018. Overnight temperatures were cooler than normal while daytime temperatures were relatively warm.

Below average rainfall

Cold nights and warm days

  • July 2018 saw above average daily maximum temperatures across the ACT
  • Canberra Airport reported a mean maximum temperature of 13.3 °C during July 2018 which is the second warmest for July behind the 13.4 °C in 2013
  • The warmest day was reported on the 5th where Tuggeranong reached 18.7 °C which was an equal highest July temperature on record for the site
  • Canberra Airport reported a maximum temperature of 18.2 °C on the 5th which is the fourth highest July temperature; the highest July temperature in Canberra was 19.7 °C on 29 July 1975
  • Tuggeranong Isabella Plains) also reported its equal highest July mean daily maximum temperature on record
  • Minimum temperatures were below average during July 2018 in the ACT.
  • Canberra Airport reported 19 days with a minimum temperature of -2 °C or cooler which is the third most number of days of this type behind 21 days in 1971 and 20 days in 1953
  • Tuggeranong(Isabella Plains) reported its lowest July mean daily minimum temperature on record with a July mean minimum of -1.8 °C

Canberra Airport

  • Total rainfall for Canberra Airport was 7.8 mm, which is 19% of the long-term average of 40.9 mm
  • The mean daily maximum temperature for Canberra Airport was 13.3 °C. The warmest day was 18.2 °C on the 5th, and the coolest day was on the 15th when the temperature reached 10.1 °C
  • The mean daily minimum temperature for Canberra Airport was -1.7 °C. The coldest morning was -7.4 °C on the 23rd, and the warmest morning was on the 25th when the minimum temperature was 9.5 °C

Further information

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Extremes in July 2018
Hottest day 18.7 °C at Tuggeranong (Isabella Plains) AWS on the 5th
Warmest days on average 13.3 °C at Canberra Airport
13.3 °C at Tuggeranong (Isabella Plains) AWS
Coolest days on average 2.3 °C at Mount Ginini AWS
Coldest day -2.2 °C at Mount Ginini AWS on the 20th
Coldest night -7.9 °C at Tuggeranong (Isabella Plains) AWS on the 23rd
Coolest nights on average -3.0 °C at Mount Ginini AWS
Warmest nights on average -1.7 °C at Canberra Airport
Warmest night 9.5 °C at Canberra Airport on the 25th
Warmest on average overall 5.8 °C at Canberra Airport
Coolest on average overall -0.3 °C at Mount Ginini AWS
Wettest overall 44.4 mm at Mount Ginini AWS
Wettest day 9.4 mm at Mount Ginini AWS on the 7th
Strongest wind gust 81 km/h at Mount Ginini AWS on the 6th
81 km/h at Mount Ginini AWS on the 31st

Record lowest July total rainfall
New record
(mm)
Old
record
Years of
record
Average for
July
Tuggeranong (Isabella Plains) AWS 6.0 13.0 in 2004 23 39.4

Lowest July total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
July
Canberra (Australian National Botanic Ga 5.6 5.1 in 1982 50.8
Bruce (Australian Institute of Sport) 9.0 5.0 in 1982* 52.3

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




Record highest July temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Tuggeranong (Isabella Plains) AWS 18.7 on the 5th = 18.7 on the 19th in 2016 23 12.3



Record highest July mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Tuggeranong (Isabella Plains) AWS 13.3 = 13.3 in 1999 22 12.3



Record lowest July mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Tuggeranong (Isabella Plains) AWS -1.8 -1.7 in 2017 22 0.0



Summary statistics for July 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
July
2018
Diff
from
average
Highest for
July
2018
Mean for
July
2018
Diff
from
average
Lowest for
July
2018
Total for
July
2018
Average
for
July
Rank of
July
2018
Fraction of
July
average
Canberra Airport 13.3 +0.8 18.2 5th -1.7 -1.6 -7.4 23rd 7.8 40.9 v low 19%
Mount Ginini AWS 2.3 -0.1 6.8 4th -3.0 -0.5 -5.6 21st 44.4 98.0 v low 45%
Tuggeranong (Isabella Plains) AWS 13.3 +1.0 18.7 5th -1.8 -1.8 -7.9 23rd 6.0 39.4 lowest 15%
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 July 2018
12345678910111213141516171819202122232425262728293031
Canberra Airport12.213.513.415.818.215.210.312.613.012.312.811.612.711.410.110.615.712.814.110.712.410.612.814.915.814.316.216.514.011.515.4
Mount Ginini AWS3.83.65.76.86.23.2-2.1-0.50.1-0.11.71.41.53.32.71.04.62.12.6-2.2-0.81.43.22.53.43.63.96.52.1-0.30.9
Tuggeranong (Isabella Plains) AWS12.713.313.715.818.714.29.613.013.012.112.311.613.810.710.311.015.813.114.210.512.610.412.014.616.214.716.316.214.211.514.0
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 July 2018
12345678910111213141516171819202122232425262728293031
Canberra Airport-3.4-3.2-2.5-3.6-2.42.23.94.6-2.5-4.7-6.3-4.8-5.0-6.5-4.8-7.3-4.90.21.20.61.6-6.2-7.4-1.39.5-2.1-4.9-3.32.44.23.0
Mount Ginini AWS-5.0-3.6-1.80.71.43.2-3.6-4.2-3.0-3.9-4.0-3.7-4.8-3.8-3.6-5.1-4.7-5.2-3.9-2.3-5.6-5.1-4.4-2.7-0.7-3.5-2.0-0.11.7-5.0-4.6
Tuggeranong (Isabella Plains) AWS-4.8-3.7-3.9-3.7-3.42.44.55.7-3.3-4.4-7.1-4.0-3.3-6.3-4.9-6.5-5.4-1.70.70.90.8-5.9-7.9-1.89.0-2.9-4.5-3.02.64.74.0
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 July 2018
12345678910111213141516171819202122232425262728293031
Bruce (Australian Institute of Sport) - - - - - - - - - - - - - - - - - - - 2.4 - - - 0.8 - - - 5.8
Canberra (Australian National Botanic Ga - - - - - - 0.6 - - - - - - - - - - - - 0.8 0.2 - - - - - - - 4.0

Canberra Airport - - 0.2 - - 0.2 1.4 - - - - - - - - - 0.2 - - 0.6 0.4 - - - 0.2 - - - 3.8 0.8 -
Canberra Parliament House - - - - - - 0.8





















Ginninderra (Charnwood (ACT)) - - 0.2 - 0.4 -
- - - - - 0.2 - - - 0.2 - - 0.6 - - - 0.2 - - - - 4.8 0.4 -
Mount Ginini AWS - - - - - - 9.4 4.8 0.4 - - - 3.8 - - - - 1.6 - 5.4 4.0 1.0 - 2.6 0.4 - - - 7.4 3.0 0.6
Nicholls (Gungahlin Lakes) - - - - - - - - - - - - - - - - - - - 1.4 0.2 - - 0.8






Torrens (Darke St) - - - - - - 1.4 - - - - - - - - - - 0.2 - 0.2 - - - 0.8






Tuggeranong (Isabella Plains) AWS - - - - - - 1.0 - - - - - - - - - - 0.2 - 0.8 0.2 - - 0.2 - - - - 3.4 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.

In September 2017 this summary was broadened to include 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 8 am on Wednesday 1 August 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