Monday, 3 June 2013 - Seasonal Climate Summary for Canberra - Product code IDCKGC15R0
Canberra in autumn 2013: Warm, dry days and cool nights
- Fourth-driest autumn on record
- Fifth-warmest maximum temperatures
- Equal-seventh-coldest minimum temperatures, fewest mild nights since 1994.
Canberra Airport recorded 43.6 mm of rain during autumn, less than a third of the historical average of 140.2 mm. This is the fourth-driest autumn on record for Canberra, and the driest autumn since 13.4 mm fell in 2004. Rainfall was below average across the city, with the highest total outside Mt Ginini at Tharwa with 71.2 mm, half its historical average and the driest autumn since 2008.
The dry autumn was associated with a stronger than normal subtropical ridge during the season, with few major rain events; while 21 days recorded some rain (average 22 days), only two days during the season recorded more than 5 mm at the airport, with 11.8 mm on 1 March and 12.6 mm on 22 March. This is well below the historical average of seven wet days and the equal-third fewest on record; the last autumns with so few rain events were in 2004 and 2005.
Canberra Airport recorded a mean maximum temperature of 21.8 °C during autumn, 1.8 °C above the historical average and the fifth-warmest autumn on record. Temperatures were well above average during all three months, associated with the generally dry conditions and several warm spells. There were 24 days reaching 25 °C or higher, the most since 2006 (average 16 days), while only 34 days dropped below 20 °C (average 48 days) and nine dropped below 15 °C (average 16 days).
Notable warm events include 12 consecutive days above 25 °C between 5-16 March; nine consecutive days above 24 °C between 7-15 April, the latest such spell on record; and five consecutive days above 20 °C between 8-13 May.
The mean minimum temperature during autumn was 5.5 °C, 1.3 °C below the historical average. This was the seventh-coldest autumn on record for Canberra, but slightly warmer than 2012 (5.3 °C). Nights were also cooler than normal throughout the season, with only 16 nights reaching at least 10 °C (average 26 nights), the fewest since 1994. The mean temperature was consequently 13.6 °C, 0.2 °C above the historical average.
|Extremes in autumn 2013|
31.8 °C at Canberra Airport on 10 Mar|
|Warmest days on average||
21.8 °C at Canberra Airport|
|Coolest days on average||
11.8 °C at Mount Ginini AWS|
1.4 °C at Mount Ginini AWS on 15 May|
-4.6 °C at Canberra Airport on 19 May|
|Coolest nights on average||
3.9 °C at Mount Ginini AWS|
|Warmest nights on average||
6.3 °C at Tuggeranong (Isabella Plains) AWS|
17.6 °C at Tuggeranong (Isabella Plains) AWS on 15 Mar|
|Warmest on average overall||
13.7 °C at Tuggeranong (Isabella Plains) AWS|
|Coolest on average overall||
7.9 °C at Mount Ginini AWS|
143.6 mm at Mount Ginini AWS|
32.2 mm at Mount Ginini AWS on 22 Mar|
|Highest wind gust||
78 km/h at Mount Ginini AWS on 21 Mar|
|Summary statistics for autumn 2013|
|Canberra Airport||21.8||+1.8||31.8||10 Mar||5.5||-1.3||-4.6||19 May||43.6||140.2||v low||31%|
|Mount Ginini AWS||11.8||21.9||7 Mar||3.9||-3.5||2 May||143.6|
|Tuggeranong (Isabella Plains) AWS||21.2||31.0||10 Mar||6.3||-4.0||19 May||50.0|
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 10 am on Monday 3 June 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.