Friday, 1 June 2007 - Seasonal Climate Summary for Canberra Averages Summary - Product code IDCKGC27L0

Canberra has warmest autumn on record

Summary

  • Warmest Autumn on record
  • Another dry Autumn
  • Large variability of rainfall totals throughout the ACT

 

Rainfall

Canberra Airport has again recorded a total rainfall for autumn well below average with 105.8 mm (historic average 143.2 mm);   however it is the wettest Autumn since 2000 when 163.2 mm was recorded. There were 27 rain days during autumn which was above the historic average of 22 rain days. Rainfall across the A.C.T. were highly variable during autumn with totals ranging from 224.8 mm at Mt Ginini to 101.6 mm at Tralee.

Temperature

Generally warm conditions prevailed in Canberra during autumn with an average monthly temperature (the average of the day-time and night-time temperatures) of 15.4°C, which is 2°C above the historic average of 13.4°C and the warmest on record.   The previous warmest was 14.9°C in 1980 and 1998.

Day-time temperatures were particularly warm with the average maximum temperature of 22.0°C being the 2nd highest since records commenced in 1939 (the highest was 22.4°C in 2005) and well above the historic average of 19.9°C. Night-time temperatures (average minimum) were also well above average at 8.8°C (historic average is 6.8°C), the 3rd highest on record and the same as 1968 (the highest on record was 10.1°C in 1989).

Extremes of temperature at Canberra Airport during autumn ranged from 35.1°C on 4 March, while the lowest temperature was 0.0°C on 31 May. Corresponding extremes at Tuggeranong ranged from 33.7°C on 5 March to a low of −2.9°C on 31 May.

Other phenomena

There were 3 thunderstorms (average 3) during autumn.  Average sunshine for autumn averaged 7.6 hours per day (average is 7.1 hours per day).  There were 7 frosts, well below the historic average of 19 frosts, indicative of  the continuing warm conditions the region is experiencing.  There were 9 fogs (average 12).   It was a little windier than usual with an average wind run of 160.7 km/day compared to the historical average of 156.3 km/day.  The 3 strong wind days recorded during autumn were the same as the average of 3 windy days. The average pressure of 1019.1 hPa was well above the historic average of 1018.8hPa., indicating the persistence of  high pressure systems over SE Australia during autumn. Evaporation was 121.5 mm, slightly up on the historic average of 116.9 mm.

Further information

Owen Offler
Climate Information
Climate Services Centre
Canberra Meteorological Office
Bureau of Meteorology
Phone (02) 62470411
Email climate.act@bom.gov.au

Extremes for the A.C.T.

Hottest day
Highest temperature
35.1°C at Canberra Airport on 4 March
Warmest days on average
Highest mean daily maximum temperature
22.0°C at Canberra Airport
Coolest days on average
Lowest mean daily maximum temperature
21.9°C at Tuggeranong AWS
Coldest day
Lowest daily maximum temperature
10.6°C at Canberra Airport on 30 May
Coldest night
Lowest temperature
−2.9°C at Tuggeranong AWS on 31 May
Coolest nights on average
Lowest mean daily minimum temperature
8.3°C at Tuggeranong AWS
Warmest nights on average
Highest mean daily minimum temperature
8.8°C at Canberra Airport
Warmest night
Highest daily minimum temperature
19.0°C at Tuggeranong AWS on 5 March
Wettest overall
Highest total rainfall
224.8 mm at Mt Ginini AWS
Driest overall
Lowest total rainfall
101.6 mm at Tralee
Wettest day
Highest daily rainfall
36.0 mm at Mt Ginini AWS on 18 May
Highest wind gust
80 km/h at Canberra Airport on 29 May

Summaries for the Canberra area

 In the following table, certain key sites have been highlighted to make them easier to identify.

Summary statistics for autumn 2007
Maximum temperatures
for autumn
(°C)
Minimum temperatures
for autumn
(°C)
Rainfall
for autumn
(millimetres)
Mean for
autumn
2007
Diff
from
normal
Highest for
autumn
2007
Mean for
autumn
2007
Diff
from
normal
Lowest for
autumn
2007
Total for
autumn
2007
Normal
for
autumn
Rank of
autumn
2007
Fraction of
autumn
normal
Canberra Airport 22.0 +2.1 35.1 4 Mar 8.8 +2.0 0.0 31 May 105.8 142.6 normal 74%
Tuggeranong* 21.9 +0.7 33.7 4 Mar 8.3 +1.4 −2.9 31 May 118.6 80.4 high 148%

* new station, averages based on period 1996−2006 only


Notes

This statement has been prepared based on information available atnoon on Friday 1 June 2007. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Normals 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 "normal" 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, normal in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of normal shows how much rain has fallen this time as a percentage of the long-term mean.