Canberra in October 2010: Wettest October in 11 years

  • Above average rainfall
  • Warm nights
  • Below average sunshine hours

Rainfall

Canberra recorded 88.6 mm of rainfall during October, which is the wettest October since 1999 when 106.2 mm was recorded. This is well above the historical October average1 of 62.1 mm, and double the rainfall experienced in October 2009 (43.2 mm).

The rain fell over 10 days (average 10). The most significant rain event occurred from the 13th - 16th, when a slow-moving trough brought widespread heavy rainfall to much of the ACT. Rainfall totals during the period included 181 mm at Mount Ginini, 119.4 mm at Tuggeranong and 78.8 mm at Canberra. An extensive cloud band extending across the ACT on the 30th-31st, brought widespread rainfall to the region, including 48.8 mm at Mount Ginini.

Two lesser rain events occurred during the month. Widespread light rainfall was recorded across the ACT from the 3rd to the 7th, associated with the passage of an upper level trough, and from the 23rd - 24th associated with the passage of a cold front.

Temperature

The average maximum temperature for Canberra was 19.3°C. This is close to the historical average of 19.4°C and slightly above the 19.0°C recorded for October 2009. The warmest day at Canberra was 23.6°C on the 5th and the coolest day was 11.3°C on the 16th. Across the ACT the warmest day was 24.7°C at Tuggeranong AWS on the 22nd, and the coolest day was 9.5°C at Tidbinbilla Nature Reserve on the 16th.

The average minimum temperature for Canberra during October was 7.0°C, which is above the historical average of 6.1°C, and slightly warmer than the October 2009 average of 6.6°C. One night dropped below freezing (1st), which is average for this time of year. The coolest night at Canberra was -0.4°C on the 1st, and for the ACT the coolest was -5.5°C at Mount Ginini on the 16th.

Wind

Canberra Airport was dominated by east-southeasterly winds during the mornings, 33% of the time. During the afternoons, north to northwesterly winds prevailed for 63% of the time. 2 strong wind days (winds >= 40kmhr) were recorded, which is below the historical average of 4 days.

Other phenomena

5 fogs were observed at Canberra Airport during October and nil frosts (average 7). Sunshine averaged 7.3 hours per day, which is below the historical average of 8.6 hours. No thunderstorms were recorded (average 3).

Further information

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Extremes in October 2010
Hottest day 24.7 °C at Tuggeranong (Isabella Plains) AWS on the 22nd
Warmest days on average 19.7 °C at Tuggeranong (Isabella Plains) AWS
Coolest days on average 10.9 °C at Mount Ginini AWS
Coldest day -1.2 °C at Mount Ginini AWS on the 16th
Coldest night -5.5 °C at Mount Ginini AWS on the 16th
Coolest nights on average 2.8 °C at Mount Ginini AWS
Warmest nights on average 8.0 °C at Canberra Airport Comparison
8.0 °C at Tuggeranong (Isabella Plains) AWS
Warmest night 14.7 °C at Canberra Airport Comparison on the 31st
Wettest overall 275.2 mm at Mount Ginini AWS
Wettest day 73.4 mm at Mount Ginini AWS on the 16th
Highest wind gust 98 km/h at Mount Ginini AWS on the 15th




Summary statistics for October 2010
Maximum temperatures
for October
(°C)
Minimum temperatures
for October
(°C)
Rainfall
for October
(millimetres)
Mean for
October
2010
Diff
from
average
Highest for
October
2010
Mean for
October
2010
Diff
from
average
Lowest for
October
2010
Total for
October
2010
Average
for
October
Rank of
October
2010
Fraction of
October
average
Southern Tablelands (Goulburn-Monaro) (district 70)
Canberra Airport 19.5   23.8 31st 7.0   -0.4 1st 88.6
Canberra Airport Comparison 19.6 +0.2 24.2 22nd 8.0 +1.9 0.9 1st 87.0 62.4 high 139%
Mount Ginini AWS 10.9   16.0 6th 2.8   -5.5 16th 275.2
Tidbinbilla Nature Reserve 18.2 -0.8 23.5 22nd 7.4 +1.3 -2.0 1st 201.5 87.7 v high 230%
Tuggeranong (Isabella Plains) AWS 19.7   24.7 22nd 8.0   0.7 1st 151.6

Daily rainfall

Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with »» are part of a longer accumulation, which is marked like this on the final day. Values over 100 mm have been rounded to the nearest whole millimetre. Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
This table is very wide; you may have to scroll sideways to see all the days, and you may need to set the paper to 'landscape' to print.

Southern Tablelands (Goulburn-Monaro) (70)12345678910111213141516171819202122232425262728293031
Canberra (Australian National Botanic Ga 2.6 0.2 0.2 4.6 17.0 30.4 14.0
Canberra Airport - - 2.6 0.2 0.2 0.2 3.4 - - - - - 12.2 37.8 13.0 15.8 - - - - - -
3.2 - - - - - -
Canberra Airport Comparison - - 2.6 0.2 0.2 - 2.8 - - - - - 10.2 31.6 12.4 17.0 0.2 - - - - - - 3.0 - 0.2 - - - - 6.6
Mount Ginini AWS - - 11.6 9.0 2.0 0.2 6.0 0.2 - - - 0.6 34.4 48.0 25.2 73.4 1.8 - - - - - 1.2 2.0 2.8 2.8 - 5.0 - 0.2 48.8
Nicholls (Gungahlin Lakes)
2.0



3.4




13.6 28.0 11.6 24.4






3.6





11.2
Tharwa General Store

13.0 2.6 0.8
1.0




17.2 27.2 17.0 51.4






0.8





19.8
Tidbinbilla Nature Reserve - - 50.0 1.2 2.4 - 2.6 - - - - - 22.0 26.0 27.4 40.0 0.2 - - - - - - 1.4 - 0.3 -
- - 28.0
Tuggeranong (Isabella Plains) AWS - - 3.6 1.8 - 2.2 3.2 - - - - 0.8 14.6 36.6 19.4 48.8 - - - - - - 0.2 2.4 - - 0.4 - - - 17.6

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 (all years of record).

1Averages 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.

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 12 pm on Monday 1 November 2010. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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