Wednesday, 1 December 2010 - Seasonal Climate Summary for Sydney - Greater Sydney - Product code IDCKGC25L0
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.
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.
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.
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.
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.
|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|
|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|
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
(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.