Australian Capital Territory in spring 2017: warmer than average days

Daytime temperatures were warmer than average in the Canberra region during spring. Overnight temperatures were close to average. The season started off drier than average, but finished with average totals in October and November.

Close to average spring rain

  • Overall, spring rainfall totals were close to average across the Territory
  • September 2017 was the seventh-driest on record for Canberra Airport, but rainfall totals were close to average in October and November
  • Canberra Airport recorded 142.2 mm (80% of average) over 31 rainfall days, which is close to average for spring
  • There were some isolated heavy falls with thunderstorms, including 62.6 mm in an hour and a half at Tuggeranong on the afternoon of 25 November

Warm spring days in Canberra

  • Daytime temperatures were 2.2 °C above average at Canberra Airport, the seventh-warmest spring on record
  • Canberra recorded 29 days above 25 °C, more than double the spring average of 14 days
  • On 23 September the temperature reached 30.2 °C at Canberra Airport, breaking the previous September record by more than 1 °C; this was followed by Canberra's equal-third-warmest October maximum on record
  • Minimum temperatures were generally close to average across the Territory
  • The temperature dropped below 2 °C on 17 days at Canberra Airport, close to the spring average of 18 days

Further information

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Extremes in spring 2017
Hottest day 31.0 °C at Canberra Airport on 25 Nov
Warmest days on average 21.9 °C at Canberra Airport
Coolest days on average 12.1 °C at Mount Ginini AWS
Coldest day -2.2 °C at Mount Ginini AWS on 5 Sep
Coldest night -6.6 °C at Mount Ginini AWS on 6 Sep
Coolest nights on average 2.7 °C at Mount Ginini AWS
Warmest nights on average 7.0 °C at Tuggeranong (Isabella Plains) AWS
Warmest night 16.4 °C at Canberra Airport on 29 Nov
Warmest on average overall 14.2 °C at Canberra Airport
Coolest on average overall 7.4 °C at Mount Ginini AWS
Wettest overall 272.8 mm at Mount Ginini AWS
Driest overall 142.2 mm at Canberra Airport
Wettest day 62.6 mm at Tuggeranong (Isabella Plains) AWS on 26 Nov
Strongest wind gust 102 km/h at Mount Ginini AWS on 23 Sep




Summary statistics for spring 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
spring
2017
Diff
from
average
Highest for
spring
2017
Mean for
spring
2017
Diff
from
average
Lowest for
spring
2017
Total for
spring
2017
Average
for
spring
Rank of
spring
2017
Fraction of
spring
average
Canberra Airport 21.9 +2.2 31.0 25 Nov 6.5 +0.4 -6.1 17 Sep 142.2 163.4 average 87%
Mount Ginini AWS 12.1 -0.2 20.9 25 Nov 2.7 -0.4 -6.6 6 Sep 272.8 272.2 average 100%
Tuggeranong (Isabella Plains) AWS 21.4 +0.5 30.0 25 Nov 7.0 +0.4 -5.0 17 Sep 215.4 189.9 average 113%
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.

Notes

The Seasonal 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 12 pm on Friday 1 December 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.

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