Monday, 2 December 2013 - Seasonal Climate Summary for Canberra - Product code IDCKGC15R0
Canberra in spring 2013: Heavy rain, warm days, severe frosts
- Close to average rainfall, from few rain days but three heavy events.
- Mild days; second-fewest days below 20 °C on record.
- Cold nights, including severe October frosts.
Rainfall - Few rain days, but heavy events
Canberra airport recorded 210 mm of rain during spring, slightly above the historical average of 178.2 mm and the wettest spring since 2005. The rain fell over 22 days, below the historical average of 30 rain days. Four days recorded at least 25 mm of rain, the equal-highest on record with spring 1983, including the wettest September day on record; these four days contributed more than 70% of the rainfall recorded during the month.
Most of the rain recorded during spring fell during three rain events. A series of surface troughs produced rain during mid-September, with 57.8 mm recorded to 9am on the 17th and totals of up to 83.8 mm at Mt Ginini. Complex surface troughs again produced heavy rain in mid-November, with a two-day total of 65.8 mm to 9am on the 12th, while a short-lived severe thunderstorm produced 26 mm in thirty minutes on the afternoon of the 21st.
Temperature - Warm days, cold nights
The average maximum temperature at Canberra airport during spring was 21.9 °C, 2.5 °C above the historical average and the fifth-warmest spring on record. Spring began with well above average temperatures, with Canberra airport recording its warmest September on record and equal-seventh-warmest October, followed by closer to normal temperatures during November. The notable feature was the lack of cold days; only 28 days dropped below 20 °C during the season (average 52 days), the second-fewest cold days on record following 22 days in 2006.
In contrast, the average minimum temperature was 4.8 °C, 1.2 °C below the historical average and the equal-seventh-coldest spring on record. Nights were mild during September but well below average in both October and November, including the coldest October night on record. There were eleven nights below 0 °C during the season (average 8 nights), including several severe frosts that caused agricultural damage during October.
|Extremes in spring 2013|
32.1 °C at Canberra Airport on 21 Oct|
|Warmest days on average||
21.9 °C at Canberra Airport|
|Coolest days on average||
12.8 °C at Mount Ginini AWS|
1.2 °C at Mount Ginini AWS on 19 Sep|
-6.3 °C at Mount Ginini AWS on 13 Sep|
|Coolest nights on average||
2.7 °C at Mount Ginini AWS|
|Warmest nights on average||
5.5 °C at Tuggeranong (Isabella Plains) AWS|
15.5 °C at Canberra Airport on 23 Oct|
|Warmest on average overall||
13.6 °C at Tuggeranong (Isabella Plains) AWS|
|Coolest on average overall||
7.7 °C at Mount Ginini AWS|
256.0 mm at Mount Ginini AWS|
83.8 mm at Mount Ginini AWS on 17 Sep|
|Highest wind gust||
98 km/h at Mount Ginini AWS on 26 Sep|
|Summary statistics for spring 2013|
|Canberra Airport||21.9||+2.5||32.1||21 Oct||4.8||-1.2||-3.4||18 Oct||210.0||178.2||average||118%|
|Mount Ginini AWS||12.8||22.0||21 Oct||2.7||-6.3||13 Sep||256.0|
|Tuggeranong (Isabella Plains) AWS||21.8||31.7||28 Nov||5.5||-2.0||18 Oct||200.2|
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 (all years of record).
A Seasonal 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 8 am on Monday 2 December 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
(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.