Canberra in July 2017: cold nights and dry conditions continue

July 2017 in Canberra was drier than average with cold nights, a continuation of the dry and clear weather experienced in June.

Dry start to winter persists

  • A total of 17 mm of rainfall was recorded at Canberra Airport during July, 41% of the monthly average and the lowest July rainfall since 2014
  • Canberra Airport received rain on 10 days, which is the July average, but the falls were relatively light: only one day reported more than 5 mm when typically there are about three days in July with more than 5 mm of rainfall
  • The below average rainfall combined with the very dry conditions in June makes this the sixth-driest June–July period on record for Canberra and the driest since 1982

Cold nights but warm days

  • Minimum temperatures at Canberra Airport were below the July average of -0.1 °C for all but eight days of the month
  • There were 22 nights where the temperature dropped below 0 °C at Canberra Airport, more than the average of 16 nights for July
  • The start of the month was particularly cold: Canberra Airport dropped to -8.7 °C on the 1st, its coldest night since 1971
  • In contrast, daytime temperatures were 1.5 °C above average, the warmest July days in Canberra since 2013
  • Only one day failed to reach a top of 10.0 °C, compared to a July average of seven days

Further information

Media
(03) 9669 4057
Enquiries

Extremes in July 2017
Hottest day 17.9 °C at Canberra Airport on the 30th
Warmest days on average 12.9 °C at Canberra Airport
Coolest days on average 2.0 °C at Mount Ginini AWS
Coldest day -1.6 °C at Mount Ginini AWS on the 20th
Coldest night -8.7 °C at Canberra Airport on the 1st
Coolest nights on average -2.7 °C at Mount Ginini AWS
Warmest nights on average -1.7 °C at Tuggeranong (Isabella Plains) AWS
Warmest night 8.8 °C at Tuggeranong (Isabella Plains) AWS on the 5th
Warmest on average overall 5.5 °C at Tuggeranong (Isabella Plains) AWS
Coolest on average overall -0.4 °C at Mount Ginini AWS
Wettest overall 72.8 mm at Mount Ginini AWS
Driest overall 16.4 mm at Tuggeranong (Isabella Plains) AWS
Wettest day 12.6 mm at Mount Ginini AWS on the 19th
Strongest wind gust 72 km/h at Mount Ginini AWS on the 26th

Record lowest July mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Tuggeranong (Isabella Plains) AWS -1.7 -1.6 in 1997 21 0.1



Summary statistics for July 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
July
2017
Diff
from
average
Highest for
July
2017
Mean for
July
2017
Diff
from
average
Lowest for
July
2017
Total for
July
2017
Average
for
July
Rank of
July
2017
Fraction of
July
average
Canberra Airport 12.9 +1.5 17.9 30th -2.3 -2.2 -8.7 1st 17.0 41.5 low 41%
Mount Ginini AWS 2.0 -0.4 6.6 29th -2.7 -0.3 -6.8 21st 72.8 101.9 low 71%
Tuggeranong (Isabella Plains) AWS 12.7 +0.5 16.5 23rd -1.7 -1.8 -7.0 2nd 16.4 40.9 low 40%
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 July 2017
12345678910111213141516171819202122232425262728293031
Canberra Airport12.113.810.613.913.312.712.311.811.612.213.312.312.714.010.810.513.713.613.010.812.112.816.214.514.713.712.314.214.417.98.8
Mount Ginini AWS4.26.33.21.30.8-0.2-0.6-0.4-1.00.03.33.13.01.6-1.02.22.50.4-0.2-1.61.72.64.42.74.00.84.42.46.64.60.1
Tuggeranong (Isabella Plains) AWS12.013.49.813.112.313.312.211.69.611.913.412.212.713.910.810.213.713.113.511.512.013.016.514.615.213.511.714.114.115.88.6
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 2017
12345678910111213141516171819202122232425262728293031
Canberra Airport-8.7-8.2-7.1-1.16.6-2.3-2.6-5.12.3-3.5-6.0-3.6-5.8-2.2-2.5-7.0-5.5-0.64.1-1.2-4.0-7.5-1.63.42.97.6-3.90.2-5.50.8
Mount Ginini AWS-5.0-1.0-0.4-1.4-1.3-2.9-3.5-3.3-4.1-4.0-3.4-3.8-3.1-1.9-3.1-5.6-3.5-1.5-2.7-4.9-6.8-3.2-2.6-1.5-2.1-0.4-3.4-2.3-3.52.0-0.2
Tuggeranong (Isabella Plains) AWS-5.8-7.0-5.7-0.98.8-2.3-2.8-4.70.7-4.4-5.7-4.1-5.7-0.4-1.9-6.5-3.90.63.6-3.2-4.5-6.3-2.70.21.07.3-4.01.6-3.50.87.8
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 2017
12345678910111213141516171819202122232425262728293031
Canberra (Australian National Botanic Ga - - - - - 3.1 0.6 - 0.2 - - - - - 0.5 - - 5.0 - - - - - - - 0.4 - 2.6 - - 6.0
Canberra Airport - - - - - 1.6 0.6 - 0.2 - - - 0.2 - 0.6 - - 4.2 2.2 - - - - - - 0.2 - 1.8 - - 5.4
Mount Ginini AWS - - - 5.0 2.6 8.4 3.4 1.2 4.6 0.8 - 0.2 - 1.2 4.0 0.4 - 5.8 12.6 1.4 0.2 - - 1.0 - 2.8 0.4 7.8 2.0 0.2 6.8
Nicholls (Gungahlin Lakes) - - - 1.8 - 5.2 0.2























Torrens (Darke St) - - - 0.4 - 1.0 0.8 - - - - - - 0.4 0.8 - - 4.4 1.2 - - - - - 0.2 0.6 - 3.6 - - 5.2
Tuggeranong (Isabella Plains) AWS - - - 0.6 - 0.4 1.0 - - 0.2 - - - - 0.6 - - 3.2 0.8 - - 0.2 - - - 1.0 - 3.2 - - 5.2
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 Canberra 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 statement has been prepared based on information available at 10 am on Tuesday 1 August 2017. 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.

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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries