Monday, 3 May 2010 - Monthly Climate Summary for ACT Monthly Summary - Product code IDCKGC25R0

ACT in April 2010: Canberra returns to warm, dry conditions

  • Below average rainfall
  • Above average minimum temperatures
  • Well above average maximum temperatures

An archive of previous monthly summaries for ACT Monthly Summary is also available, as are summaries for other states and many other climate summaries and diagnostics.

Rainfall

As a contrast to the high rainfall recorded in February and March, Canberra recorded well below average rainfall in April 2010. The total rainfall at Canberra Airport was 20mm, less than half the average monthly rainfall of 46mm, with the highest rainfall total in the Canberra region just 58.6mm at Canberra (Australian National Botanical Gardens).

The rain was spread over 8 rain days, approximately equal to the average of 7 rain days. However, six of these were less than 2mm, with the only significant total of 12.8mm recorded at Canberra Airport on the 25th, associated with the passage of a cold front. High totals were also recorded in some suburbs on the 21st associated with an isolated thunderstorm, with a maximum of 37.8mm recorded at Canberra (Australian National Botanical Gardens) but no rain recorded at Canberra Airport.

Temperature

The mean daily temperature in Canberra during April 2010 was 14.3°C, 1°C above the historical average of 13.3°C, which is the warmest April since 2007. This was due to both above average minimum and maximum temperatures, associated with the generally clear conditions and low rainfall during the month, in addition to prevailing westerly winds.

Maximum temperatures at Canberra Airport were 21.1°C during April 2010, 1.1°C above the historical average of 20.0°C. The highest temperature recorded during the month at Canberra Airport was 25.4°C on the 22nd, with the highest temperatures recorded anywhere in Canberra 25.5°C at Tuggeranong on the 21st and 22nd. 21 days during the month had temperatures above 20°C, well above the April average of 15 days, associated with clear conditions and above average sunshine.

Minimum temperatures were also above average at Canberra Airport, with 7.5°C on average during April 2010, 0.8°C above the historical average of 6.7°C. Nights were warmer in Tidbinbilla Nature Reserve, with 7.9°C on average during April and a maximum night-time temperature of 15.0°C on the 8th, its equal warmest night on record. The coldest temperature recorded anywhere in Canberra was -2.6°C at Mount Ginini AWS on the 12th.

Some sites had their warmest April night (highest daily minimum temperature) on record.

Wind

W-NW winds prevailed in Canberra during April 2010, forming 70% of afternoon flow. This was well above the average of 45% from this direction, contributing to the warm and dry conditions experienced during the month. The highest wind gust recorded at Canberra Airport was 61km/h on the 11th, with the highest gust anywhere in Canberra 80km/h at Mount Ginini AWS on the same day. No strong wind days were recorded at Canberra Airport, below the average of 1.6 days.

Other phenomena

Only one thunderstorm was recorded in the ACT during April, on the 21st, with none reported at Canberra Airport, below the April average of 1.3 days. Sunshine averaged 8.2 hours per day during April, well above the April average of 7.3 hours per day. Average 3pm humidity was 46%, approximately average for April.

Further information

Media
(03) 9669 4057
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Extremes

Hottest day
Highest temperature
25.5 °C at Tuggeranong (Isabella Plains) AWS on the 20th
25.5 °C at Tuggeranong (Isabella Plains) AWS on the 21st
Warmest days on average
Highest mean daily maximum temperature
21.4 °C at Tuggeranong (Isabella Plains) AWS
Coolest days on average
Lowest mean daily maximum temperature
20.1 °C at Tidbinbilla Nature Reserve
Coldest day
Lowest daily maximum temperature
4.6 °C at Mount Ginini AWS on the 27th
Coldest night
Lowest temperature
-2.6 °C at Mount Ginini AWS on the 12th
0.0 °C at Tuggeranong (Isabella Plains) AWS on the 13th
Coolest nights on average
Lowest mean daily minimum temperature
7.5 °C at Canberra Airport
Warmest nights on average
Highest mean daily minimum temperature
7.9 °C at Tidbinbilla Nature Reserve
Warmest night
Highest daily minimum temperature
15.5 °C at Tuggeranong (Isabella Plains) AWS on the 8th
Wettest overall
Highest total rainfall
58.6 mm at Canberra (Australian National Botanic Ga
Wettest day
Highest daily rainfall
37.8 mm at Canberra (Australian National Botanic Ga on the 21st
Highest wind gust
80 km/h at Mount Ginini AWS on the 11th

Records

Record highest April daily minimum temperature
Highest daily minimum
temperature
in April 2010 (°C)
Previous highest
for April
Years of
record
Average for
April
Tidbinbilla Nature Reserve 15.0 on the 8th = 15.0 on the 3rd in 2009 25 6.5



Summaries

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

Summary statistics for April 2010
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2010
Diff
from
average
Highest for
April
2010
Mean for
April
2010
Diff
from
average
Lowest for
April
2010
Total for
April
2010
Average
for
April
Rank of
April
2010
Fraction of
April
average
Canberra Airport 21.1 +1.1 25.4 22nd 7.5 +0.8 0.2 13th 20.0 46.0 low 43%
Tidbinbilla Nature Reserve 20.1 +1.1 24.5 23rd 7.9 +1.4 1.0 13th 34.8 65.1 average 53%
Tuggeranong 21.4   25.5 21st 7.6   0.0 13th 21.4

Notes

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.

A Monthly Climate Summary is prepared to list the main features of the weather in ACT Monthly Summary 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 9 am on Monday 3 May 2010. 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 decile ranking (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.

Further information

Media
(03) 9669 4057
Enquiries