Tuesday, 1 July 2008 - Monthly Climate Summary for Canberra_AWS - Product code IDCKGC1xx0

Canberra in June 2008
Warmest start to winter since 1957

Summary

  • 2nd warmest June on record for average maximum temperatures
  • 3rd warmest June on record for average minimum temperatures
  • Slightly below average rainfall

Rainfall

Persistent high pressure systems to the south and southeast of the continent brought fine weather and little rainfall to the ACT region during June. Canberra Airport recorded a total rainfall of 21.2 mm, which is below the historical average of 40.8 mm. This is the driest June since 2004 (when 11.6 mm was recorded), and the 4th consecutive month with below average rainfall. There were 7 rain days during the month, compared to the historic average of 8 rain days.

Rain bearing systems that brought light rainfall to the region during June included a low pressure system off the Queensland coast around the 4th, and an upper level trough around the 10th and the 20th. Monthly totals for the ACT ranged from a high of 55.2 mm at Mount Ginini AWS to a low of 15.0 mm at Watson (Racecourse) in Canberra's northern suburbs.

See a map of total rainfall. See a map of rainfall deciles.

Temperatures

Stable weather conditions and a lack of strong cold fronts meant that very mild days prevailed in Canberra during June. The mean maximum (daytime) temperature at Canberra Airport was 14.5°C, which is 2.3°C above the historical average1 of 12.2°C. This is the 2nd warmest June on record for mean maximum temperatures (current record is 15.8°C set in June 1957).

Very mild nights also prevailed in Canberra during June, particularly during the first half of the month, when moist easterly flow and associated cloud cover affected the region. The mean minimum (overnight) temperature at Canberra Airport was 4.4°C, which is 3.7°C above the historical average of 0.7°C. This is the 3rd warmest June on record at Canberra Airport for mean minimum temperatures (current record is 5.4°C set in June 1991).

With both maximum and minimum temperatures well above average at Canberra Airport during the month, the mean temperature (average of the maximum and minimum) of 9.5°C was the 2nd highest on record for June (current record is 9.8°C set in June 1991). This is 3.1°C above the historical average of 6.4°C.

See a map of mean maximum temperatures. See a map of maximum temperature anomalies.

See a map of mean minimum temperatures. See a map of minimum temperature anomalies.

Wind

The prevailing wind direction over Canberra Airport during the afternoons was N to NW for about 43% of the time. This is about the normal frequency expected from this direction at Canberra Airport during June. The highest wind gust recorded was 70 km/hr at Canberra Airport on the 30th, associated with the passage of a cold front.

Other phenomena

With very mild days and nights during June, Canberra Airport recorded only 9 frosts for the month, well below the historical average of 18 frosts. This is the lowest number of frosts for June since 1991 and the 3rd lowest on record. The frequency of fogs was also well below average with only 3 fogs reported at the Airport compared to the normal frequency of around 8 fogs. The amount of sunshine averaged 5.2 hours per day which is normal for June. No thunderstorm or hail activity occurred in the Canberra region during the month.

Further information

NSW Climate Services Centre
Bureau of Meteorology
Phone (02) 9296 1555
Email reqnsw@bom.gov.au

Extremes for the ACT

Hottest day
Highest temperature
16.9 °C at Canberra Airport on the 16th
Warmest days on average
Highest mean daily maximum temperature
14.5 °C at Canberra Airport and at Tuggeranong AWS
Coolest days on average
Lowest mean daily maximum temperature
5.3 °C at Mount Ginini AWS (elev 1760 metres)
Coldest day
Lowest daily maximum temperature
0.0 °C at Mount Ginini AWS on the 13th and 26th
Coldest night
Lowest temperature
-5.3 °C at Mount Ginini AWS on the 14th
Coolest nights on average
Lowest mean daily minimum temperature
0.1 °C at Mount Ginini AWS
Warmest nights on average
Highest mean daily minimum temperature
4.4 °C at Canberra Airport
Warmest night
Highest daily minimum temperature
10.6 °C at Canberra Airport and at Tuggeranong AWS on the 4th
Wettest overall
Highest total rainfall
55.2 mm at Mount Ginini AWS
Driest overall
Lowest total rainfall
15.0 mm at Watson (Racecourse)
Wettest day
Highest daily rainfall
18.0 mm at Mount Ginini AWS on the 4th
Highest wind gust
70 km/h at Canberra Airport on the 30th

Summaries for the ACT

This table is very wide and may not fit if printed.

Summary statistics for June 2008
Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(millimetres)
Mean for
June
2008
Diff
from
normal
Highest for
June
2008
Mean for
June
2008
Diff
from
normal
Lowest for
June
2008
Total for
June
2008
Normal
for
June
Rank of
June
2008
Fraction of
June
normal
 
Canberra Airport
14.5 +2.3 16.9 16th 4.4 +3.7 -1.5 28th 21.2 40.8 low 52%
Mount Ginini AWS*
5.3   10.7 17th 0.1   -5.3 14th 55.2
Tuggeranong**
14.5 +1.6 16.7 6th 3.3 +2.4 -1.8 24th 29.4 52.0 low 56%

* new station, no historic averages available
** short record, 1996 - 2007 only


Notes

This statement has been prepared based on information available at 9 am on Tuesday 1 July 2008. 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: Averages are based on the period 1961 to 1990 which is a convention of the World Meteorological Organisation

Normals are long-term averages 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 for temperature and less than 30 years of record for rainfall, as they cannot then be calculated reliably.

Further information

NSW Climate Services Centre
Bureau of Meteorology
Phone (02) 9296 1555
Email reqnsw@bom.gov.au