Monday, 2 April 2007 - Monthly Climate Summary for Canberra area - Product code IDCKGC1xx0

Warm nights, below average rainfall in Canberra during March

  • Warm month with above average temperatures
  • Average minimum temperature 6th highest on record at 12.6°C
  • 6 hot days exceeding 30°C, twice the historic average
  • Below average rainfall

Rainfall

Canberra Airport received below average rainfall during March with a total of 35.4 mm compared to the historic average of 51.1 mm.  There were 10 rain days which was above the average of 7 rain days.  Much of the rain fell over a few days mid-month when a low-pressure trough caused showers and thunderstorms over the region. There was little variation in March rainfall across the ACT with totals ranging from 74 mm at Corin Dam (Boat Ramp) and 70.2 mm at Mawson to 29 mm at Tuggeranong.

Temperature

Generally warm conditions prevailed in Canberra throughout March, except for the last week when below average temperatures were recorded. The average mean temperature (the average of daytime and night-time temperatures) was 19.2°C, well above the historic average1 of 17.6°C . The average maximum temperature at Canberra Airport was 25.8°C or 1.3°C above the historic average1 of 24.5°C.  There were 6 hot days with a maximum temperature exceeding 30°C, twice the historic average of 3 days.  Canberra generally experienced very mild nights during March with an average minimum temperature of 12.6°C, the 6th highest on record and well above the historic average1 of 10.7°C.  Only during the last week of the month did the overnight temperatures drop well below average.

Extremes of temperature at Canberra Airport ranged from a high of 35.1°C on the 4th to a low of 3.9°C on the 31st.  Corresponding extremes at Tuggeranong ranged from 33.7°C on the 5th to a low of  2.8°C on the 31st. Temperatures fell as low as −1°C at Mount Ginini (elevation 1760 metres) on the Brindabella Ranges on the 25th.

Other phenomena

Thunderstorms were recorded on 2 days during March which equals the historic average. Average sunshine for March was 8.0 hours per day, slightly below the historic average of  8.1 hours per day.  The wind run was 177 km per day, above the historic average wind run of 167 km per day for March. No strong wind days were recorded during the month (average 1).  There were 2 fogs recorded at the Airport on the 20th and 28th with visibility as low as 500 metres on the 20th.  Fog patches were also recorded on the 1st and 3rd. Air pressure was below average at 1014.9 hPa (historic average 1016.5 hPa).  The total evaporation of 174.6 mm was close to the historic average evaporation of  172.1 mm.

Further information

Mike De Salis
NSW Climate Services Centre
Bureau of Meteorology
Phone (02) 9296 1542
Email: reqnsw@bom.gov.au


Extremes in the Canberra area

Hottest day
Highest temperature
35.1°C at Canberra Airport on the 4th
Warmest days on average
Highest mean daily maximum temperature
25.8°C at Canberra Airport and Tuggeranong
Coolest days on average
Lowest mean daily maximum temperature
25.8°C at Canberra Airport and Tuggeranong
Coldest day
Lowest daily maximum temperature
17.0°C at Canberra Airport on the 30th
Coldest night
Lowest temperature
Canberra:  2.8°C at Tuggeranong on 31st
ACT:  −1.0°C at Mount Ginini on the 25th
Coolest nights on average
Lowest mean daily minimum temperature
12.6°C at Canberra Airport and Tuggeranong
Warmest nights on average
Highest mean daily minimum temperature
12.6°C at Canberra Airport and Tuggeranong
Warmest night
Highest daily minimum temperature
19.0°C at Tuggeranong on the 5th
Wettest overall
Highest total rainfall
Canberra:  70.2 mm at Mawson
ACT:  74.0 mm at Corin Dam (Boat Ramp)
Driest overall
Lowest total rainfall
29.0 mm at Tuggeranong
Wettest day
Highest daily rainfall
27.6 mm at Garran on the 1st
Highest wind gust
63 km/h at Tuggeranong on the 25th

Summaries

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

Summary statistics for the Canberra area for March 2007
Maximum temperatures
for March
(°C)
Minimum temperatures
for March
(°C)
Rainfall
for March
(millimetres)
Mean for
March
2007
Diff
from
normal
Highest for
March
2007
Mean for
March
2007
Diff
from
normal
Lowest for
March
2007
Total for
March
2007
Normal
for
March
Rank of
March
2007
Fraction of
March
normal
Canberra Airport 25.8 +1.3 35.1 4th 12.6 +1.8 3.9 31st 35.4 51.1 normal 69%
Tuggeranong* 25.8 +0.3 33.7 4th 12.6 +1.6 2.8 31st 29.0 32.0 normal 91%

*  new station, historic average based on period 1996 - 2006 only.

Summary phenomena for Canberra Airport for March
 

March 2007

Normal for March

Number of rain days

 10

 7

Average sunshine hours per day

 8.0

8.1

Average humidity at 9am (%)

74

70

Number of thunderstorms

 2

 2

Number of windy days

 0

 1

Number of frosts

0

0.5


Notes

This statement has been prepared based on information available at 4pm on Monday 2 April 2007. The data has been quality controlled but it is possible that results will change as new information becomes available.

1Historic 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 for Canberra Airport are based on all years of record 1939 - 2006.

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.