Monday, 3 September 2007 - Seasonal Climate Summary for Canberra Averages Summary - Product code IDCKGC27L0

Warmer and slightly Drier  Winter  in Canberra

 Summary

  • Slightly below average rainfall during Winter
  • Very warm night-time temperatures ( third warmest on record).
  • Slightly warmer daytime temperatures

Rainfall

Canberra Airport recorded a total rainfall of 123.2 mm during winter slightly below the historic average of  129.6 mm. Most of the rainfall fell at the start of winter during the month of June, with the later part of winter being drier than average as the ACT was  predominately under the influence of  high pressure systems.  There were more rain days during winter with 38 days of rain compared the long term average of  30 days.. There was considerable variation in winter rainfall totals across the ACT with totals ranging from 197.8 mm at Mount Ginini to 63.0 mm at Lanyon House.

Temperature

Generally warm conditions prevailed in Canberra during winter, the mean daily temperature (the average of the  mean maximum and  mean minimum temperatures) at Canberra Airport was 7.4°C which is 1.0°C warmer than the historic average of 6.4°C and the third warmest winter on record (the warmest was  7.6°C in 2005).  The average maximum (day-time) temperatures during winter was 12.7°C which slightly warmer than the long term average of 12.2°C.  However, Canberra Airport experienced well above average minimum (night-time) temperatures during winter with an average minimum of  2.2°C, being  1.6°C above the historic average of 0.6°C and the third warmest on record ( record was 2.9°C in 1945)

Extremes of temperature at Canberra Airport ranged from a high of  21.9°C on the 28th of August to a low of −4.7°C on the 17th of July. Corresponding extremes for Tuggeranong ranged from a high of  22.5°C on the 27th of August to a low of −6.8°C on the 17th of July.

Other phenomena

With the nights being milder the number of  frosts during winter were less, overall there were 48 frosts recorded during winter ( average of 57 frosts). There were 13 fogs (average 19 fogs).  It was generally sunnier (every month had above average sunshine) during winter with sunshine averaging  6.3 hours per day (long term average 5.9 hours per day).  Winter was windier than usual with an average wind run of  200.9 km per day compared to the long term average of 187 km per day. There were 5 strong wind days (average 7) and there was also 1 gale day (average 0). There were no snow days (average 0) reported at Canberra Airport during winter, however there was snow on the hills surrounding Canberra on several occassions. There were 2 thunderstorms (average 0)  the first in July associated with  the passage of an upper level trough, while the one in August was with the passage of a cold front . Even though there was no hail days reported at Canberra Airport during winter several northern and southern suburbs reported pea size hail on both days the thunderstorms occurred.. The average air pressure of 1020.2 hPA was exactly the same as the long term average of  1020.2 hPa. The total evaporation of  188.8 mm was slightly more than the average of  178.6  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

Hottest day
Highest temperature
22.5°C at Tuggeranong (Isabella Plains) AWS on 27 Aug
Warmest days on average
Highest mean daily maximum temperature
12.7°C at Canberra Airport
Coolest days on average
Lowest mean daily maximum temperature
12.7°C at Canberra Airport
Coldest day
Lowest daily maximum temperature
5.4°C at Tuggeranong (Isabella Plains) AWS on 16 Jul
Coldest night
Lowest temperature
−6.8°C at Tuggeranong (Isabella Plains) AWS on 17 Jul
Coolest nights on average
Lowest mean daily minimum temperature
1.7°C at Tuggeranong (Isabella Plains) AWS
Warmest nights on average
Highest mean daily minimum temperature
2.2°C at Canberra Airport
Warmest night
Highest daily minimum temperature
11.1°C at Tuggeranong (Isabella Plains) AWS on 11 Aug
Wettest overall
Highest total rainfall
123.2 mm at Canberra Airport
Wettest day
Highest daily rainfall
25.2 mm at Canberra Airport on 27 Jun
Highest wind gust
85 km/h at Canberra Airport on 10 Aug

Summaries

Summary statistics for winter 2007
Maximum temperatures
for winter
(°C)
Minimum temperatures
for winter
(°C)
Rainfall
for winter
(millimetres)
Mean for
winter
2007
Diff
from
normal
Highest for
winter
2007
Mean for
winter
2007
Diff
from
normal
Lowest for
winter
2007
Total for
winter
2007
Normal
for
winter
Rank of
winter
2007
Fraction of
winter
normal
Sthn Tablelands Gburn-Monaro (district 70)
Canberra Airport 12.7 +0.5 21.9 28 Aug 2.2 +1.7 −4.7 17 Jul 123.2 129.6 normal 96%
Tuggeranong 12.7 −0.5 22.5 27 Aug 1.7 +1.2 −6.8 17 Jul 94.0 147.4 low 64%

Notes

This statement has been prepared based on information available at noon on Monday 3 September 2007. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

A note about deciles: Deciles are used to give an element (in this case rainfall or temperature) a ranking. Deciles are calculated by arranging the totals in ascending order (from lowest to highest) then splitting them into 10 equal groups (thus the groups are called deciles). The first group would be in decile range one, the second group in decile range two, etc up to the highest annual totals (highest 10 per cent) being in decile range 10.

1Averages:  Historic average temperatures for Canberra Airport are based on the period 1961 to 1990 which is a convention of the World Meteorological Organisation.  Historic rainfall averages and extremes for Canberra Airport are based on all years of record 1939 - 2006.

Normals are long-term averages based on observations from all available years of record, which vary from site to site. They are not shown for sites with less than 20 years of record for temperature and less than 30 years of record for rainfall, as they cannot then be calculated reliably.

Further information

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