Canberra in September 2013: Warm, wet September for Canberra

  • Wettest September day on record
  • Warmest September on record

Rainfall - Wettest September day on record

Canberra Airport recorded 91 mm of rain during September, well above the historical average of 52 mm. This was the seventh-wettest September on record for Canberra, and the wettest since 100.6 mm was recorded in 2005. The rain fell over seven rain days, below the historical average of 10 days, but three recorded at least 10 mm (average 2 days).

Almost all of the rain fell between the 14th and 19th, associated with a succession of cold fronts and surface troughs. The heaviest rain fell on the 17th associated with a complex surface trough, with 57.8 mm at Canberra Airport, its wettest September day on record. Records were also broken at three other Canberra sites, with falls reaching 76.2 mm at Tuggeranong and 83.8 mm at Mt Ginini.

Some sites had their highest September daily rainfall on record.

Temperature - Warmest September on record

Canberra Airport recorded an average maximum temperature of 19.9 °C during September, 3.7 °C above the historical average and the warmest September on record. Temperatures were persistently mild throughout the month, with 25 days reaching at least 15 °C (average 18.3) and 15 days reaching at least 20 °C.

Temperatures were particularly warm at the start of the month, with 10 consecutive days above 20 °C between 1-10 September, the second-longest such spell on record for September and significantly earlier than the record of 12 days 18-29 September 1987. Temperatures reached 25.2 °C on the 10th, the earliest day above 25 °C on record, and two weeks earlier than the previous record (24 September 2009).

The average minimum temperature was 4 °C, 0.7 °C above the historical average. Three nights exceeded 10 °C during the month (average 1 night), including two consecutive warm nights during the rain event of the 17th and 18th. The mean temperature was consequently 11.9 °C, 2.1 °C above the historical average and the warmest September on record.

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Extremes in September 2013
Hottest day 25.4 °C at Tuggeranong (Isabella Plains) AWS on the 2nd
25.4 °C at Tuggeranong (Isabella Plains) AWS on the 24th
Warmest days on average 19.9 °C at Canberra Airport
Coolest days on average 10.4 °C at Mount Ginini AWS
Coldest day 1.2 °C at Mount Ginini AWS on the 19th
Coldest night -6.3 °C at Mount Ginini AWS on the 13th
Coolest nights on average 2.1 °C at Mount Ginini AWS
Warmest nights on average 4.7 °C at Tuggeranong (Isabella Plains) AWS
Warmest night 11.1 °C at Tuggeranong (Isabella Plains) AWS on the 18th
Warmest on average overall 12.2 °C at Tuggeranong (Isabella Plains) AWS
Coolest on average overall 6.3 °C at Mount Ginini AWS
Wettest overall 147.6 mm at Mount Ginini AWS
Wettest day 83.8 mm at Mount Ginini AWS on the 17th
Highest wind gust 98 km/h at Mount Ginini AWS on the 26th

Record highest September daily rainfall
Highest daily rainfall
in September 2013 (mm)
Previous wettest
for September
Years of
record
Tharwa General Store 74.0 on the 17th 51.6 on the 8th in 1960 71
Canberra (Australian National Botanic Gardens) 45.8 on the 17th 45.2 on the 8th in 1978 46
Torrens (Darke St) 65.6 on the 17th 37.0 on the 17th in 1999 29


Summary statistics for September 2013
Maximum temperatures
for September
(°C)
Minimum temperatures
for September
(°C)
Rainfall
for September
(millimetres)
Mean for
September
2013
Diff
from
average
Highest for
September
2013
Mean for
September
2013
Diff
from
average
Lowest for
September
2013
Total for
September
2013
Average
for
September
Rank of
September
2013
Fraction of
September
average
Canberra Airport 19.9 +3.7 25.2 2nd 4.0 +0.7 -3.0 13th 91.0 52.0 v high 175%
Mount Ginini AWS 10.4   17.2 30th 2.1   -6.3 13th 147.6
Tuggeranong (Isabella Plains) AWS 19.7   25.4 24th 4.7   -1.1 27th 107.8

Notes

As of March 2010, the official station for Canberra is 70351 'Canberra Airport'. Averages from the previous site, 70014 Canberra Airport Comparison, are used for comparisons.

A Monthly Climate Summary is prepared to list 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, usually published in the fourth week of the month.

This statement has been prepared based on information available at 9 am on Monday 14 October 2013. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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 20 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

Further information

Media
(03) 9669 4057
Enquiries