Sydney in spring 2010: Wettest spring in 7 years

  • Wettest spring for Sydney since 2004
  • Cool days, warm nights

The Bureau of Meteorology’s 2010 annual climate summary for Sydney will be published on this web site on Wednesday 5 January, as will a comprehensive summary for all of Australia.

Rainfall

Following near-normal winter rainfall, Sydney experienced above average rainfall during spring. The season started dry, with below average rainfall in September (42.2 mm), however, above average falls in October (85.0 mm) and November (129.6 mm) lifted the total spring rainfall to 256.8 mm. This is above the historical spring average of 229.7 mm, which is wetter than spring 2009 (209.4 mm), and the wettest spring since 2004 (361.0 mm) for Sydney Observatory Hill.

The rain fell on 37 days (spring average 34 days), with 8 days recording 10 mm or more of rainfall, which is above average for the season (6 days). There were 3 days with 25 mm or more of rainfall, which is above the historical average of 2 days.

Sydney's water storage levels have risen during spring, from 57.8% in September to 59.3% in November. Current water storage information can be found on the new Bureau of Meteorology Water Storage web site.

Temperature

Spring kicked off in Sydney with warmer than average day-time temperatures in September (21.0°C). However, temperatures returned to near-normal in October (22.0°C) and cooled off in November (23.5°C), bringing the overall spring average maximum temperature to 22.2°C which is 0.3°C above the historical average of 21.9°C. Although above average, this is lower than the spring 2009 average maximum temperature of 23.5°C, which was the 8th warmest on record. Two days above 30 °C were recorded during the season (both occurred in November), which is below the spring average of 4 days.

Minimum temperatures were above average throughout the season, averaging 14.7°C which is 1.3°C above the historical average of 13.4°C. Although above average, this is lower than the spring 2009 average minimum temperature of 15.4°C (which was the warmest on record).

There were 14 warm nights during spring (minimum temperature greater than 18°C). This is double the historical average of 7 nights, yet less than the spring 2009 total of 24 warm nights.

Wind

Coastal Sydney experienced prevailing north-eastlery winds during spring, with a frequency of 53% from this direction at 3pm, which is about average for the season. The strongest wind gust at Sydney Airport was 93 km/hr from the west on the 16th October.

Other phenomena

Sunshine at Sydney Airport averaged 6.8 hours per day (historical average for spring 7.4 hours per day). There were 8 thunderstorms observed at Sydney Airport during spring, which is average for the season.

Further information

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Extremes in spring 2010
Hottest day 35.0 °C at Sydney Olympic Park (Sydney Olympic Pk A on 13 Nov
Warmest days on average 24.1 °C at Penrith Lakes AWS
Coolest days on average 21.7 °C at Springwood (Valley Heights)
Coldest day 14.6 °C at Springwood (Valley Heights) on 16 Oct
Coldest night 2.0 °C at Campbelltown (Mount Annan) on 8 Sep
Coolest nights on average 10.7 °C at Campbelltown (Mount Annan)
Warmest nights on average 14.7 °C at Sydney (Observatory Hill)
Warmest night 23.1 °C at Sydney Olympic Park (Sydney Olympic Pk A on 15 Nov
Wettest overall 328.0 mm at Audley (Royal National Park)
Wettest day 69.0 mm at Chatswood Bowling Club on 15 Sep
Highest wind gust 93 km/h at Sydney Airport AMO on 16 Oct




Summary statistics for spring 2010
Maximum temperatures
for spring
(°C)
Minimum temperatures
for spring
(°C)
Rainfall
for spring
(millimetres)
Mean for
spring
2010
Diff
from
average
Highest for
spring
2010
Mean for
spring
2010
Diff
from
average
Lowest for
spring
2010
Total for
spring
2010
Average
for
spring
Rank of
spring
2010
Fraction of
spring
average
Central Tablelands (South) (district 63)
Springwood (Valley Heights) 21.7   31.4 14 Nov 11.5   3.9 17 Sep 314.4 226.9 high 139%
Metropolitan (East) (district 66)
Bankstown Airport AWS 23.1 -0.4 33.4 14 Nov 12.3 +0.7 4.9 18 Sep 238.6 183.9 high 130%
Canterbury Racecourse AWS 22.2   31.9 13 Nov 12.0   4.8 18 Sep 325.2
Holsworthy Control Range 23.0   33.4 13 Nov 11.3   3.4 8 Sep 287.4
Parramatta North (Masons Drive) 23.1 -0.5 33.4 13 Nov 12.1 +0.3 4.9 30 Sep 248.8 209.1 average 119%
Sydney (Observatory Hill) 22.1 +0.2 30.4 14 Nov 14.7 +1.3 8.2 8 Sep 256.8 229.9 average 112%
Sydney Airport AMO 22.6 +0.3 32.5 14 Nov 14.5 +1.6 7.5 8 Sep 280.8 213.3 high 132%
Sydney Olympic Park (Sydney Olympic Pk A 23.5   35.0 13 Nov 13.8   7.2 8 Sep 277.8
Terrey Hills AWS 21.2   31.1 13 Nov 12.8   5.1 18 Sep 260.2
Metropolitan (West) (district 67)
Badgerys Creek AWS 22.9   32.4 14 Nov 11.0   3.1 17 Sep 254.2
Horsley Park Equestrian Centre AWS 23.0   33.4 13 Nov 11.7   3.4 18 Sep 216.4
Liverpool (Michael Wenden Centre) 23.5   34.2 13 Nov 11.7   3.0 8 Sep 231.1
Penrith Lakes AWS 24.1   34.0 14 Nov 12.0   3.5 17 Sep 230.2
Prospect Reservoir 23.8 +0.4 33.7 14 Nov 12.2 +0.3 4.4 17 Sep 221.1 179.6 high 123%
Richmond RAAF 23.5   33.7 13 Nov 11.3   2.2 17 Sep 200.8
Illawarra (district 68)
Camden Airport AWS 23.4 -0.6 33.7 14 Nov 10.8 +1.0 2.1 12 Sep 288.4 183.5 v high 157%
Campbelltown (Mount Annan) 23.3   33.3 14 Nov 10.7   2.0 8 Sep 277.8

Notes

A Seasonal Climate Summary is prepared to list the main features of the weather in Sydney - Greater Sydney 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 Wednesday 1 December 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