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Thursday, 1 December 2011 - Seasonal Climate Summary for Sydney - Greater Sydney - Product code IDCKGC15L0
Sydney Observatory Hill recorded 257.4 mm of rainfall during spring, above the historical average of 230.1 mm and slightly wetter than Spring 2010 (256.8 mm), making it the wettest spring since 2004 (361 mm). Most of the rain fell during November, with closer to average falls during September and below average during October.
There were two particularly wet events during the season. The first, between the 25th and 26th of September, caused two-day totals of 53.8 mm at Observatory Hill and up to 112.2 mm at Turramurra, associated with moist easterly windflow. The second was associated with a low pressure trough towards the end of November, with daily falls of up to 38.8 mm at Observatory Hill and four-day totals as high as 152.6 mm at Berowra in northern Sydney. The wettest single day was at Cronulla on October 15, with isolated heavy rain causing falls of up to 78 mm, but little rain elswhere in Sydney.
Maximum temperatures were above average in Sydney during spring, at 23 °C compared to the historical average of 21.9 °C, with slightly warmer than average days throughout the metropolitan region. Temperatures were generally warm during September and November, but closer to average in October associated with cloudy conditions. There were seven days above 30 °C during the season, above the historical average of 4.3 days and substantially more than Spring 2010 (2 days).
The average minimum temperature was 14.8 °C at Sydney Observatory Hill during spring, 1.9 °C above the historical average. This is the equal 5th warmest spring on record for minimum temperatures, and the warmest since spring 2009 (15.4 °C); Sydney has not recorded below average minimum temperatures in spring since 1974. Minimums were above average throughout the season, but particularly towards the end of spring, with the 3rd warmest November on record. This included the equal 5th warmest spring night on record, with 24.2 °C on November 10.
Winds were predominantly southerly to easterly during spring, with 80% of 3pm winds at Sydney Airport between S and NE, typical for spring. There were only 7 strong wind days during the season, below average for spring, with the highest wind gusts reaching 96 km/hr at Richmond RAAF associated with a southerly change on September 29.
Sydney Airport recorded an average of 7 hours of sunshine during spring, slightly below the historical average of 7.4 hours, associated with cloudy conditions in October and November. There were three thunderstorms reported at the Airport, below the spring average of 8 storms, with 15 thunderstorms reported anywhere in the Metropolitan region.
|Extremes in spring 2011|
|Hottest day||38.7 °C at Penrith Lakes AWS on 14 Nov|
|Warmest days on average||25.0 °C at Penrith Lakes AWS|
|Coolest days on average||21.8 °C at Terrey Hills AWS|
|Coldest day||12.4 °C at Springwood (Valley Heights) on 25 Sep|
|Coldest night||-0.6 °C at Camden Airport AWS on 13 Sep|
|Coolest nights on average||
10.6 °C at Camden Airport AWS|
10.6 °C at Campbelltown (Mount Annan)
|Warmest nights on average||14.9 °C at Sydney (Observatory Hill)|
|Warmest night||24.2 °C at Sydney (Observatory Hill) on 10 Nov|
|Warmest on average overall||
19.0 °C at Sydney (Observatory Hill)|
19.0 °C at Sydney Airport AMO
|Coolest on average overall||17.3 °C at Springwood (Valley Heights)|
|Wettest overall||396.0 mm at Avalon (Wollstonecraft Ave)|
|Wettest day||78.0 mm at Cronulla South Bowling Club on 15 Oct|
|Highest wind gust||96 km/h at Richmond RAAF on 29 Sep|
|Summary statistics for spring 2011|
|Badgerys Creek AWS||24.2||37.2||14 Nov||11.1||1.2||13 Sep||250.6|
|Bankstown Airport AWS||23.9||+0.5||37.3||14 Nov||12.5||+0.9||4.3||13 Sep||238.6||185.2||average||129%|
|Camden Airport AWS||24.3||+0.3||37.2||14 Nov||10.6||+0.7||-0.6||13 Sep||254.0||184.2||high||138%|
|Campbelltown (Mount Annan)||24.1||37.4||14 Nov||10.6||0.6||13 Sep||220.4|
|Canterbury Racecourse AWS||23.2||36.6||14 Nov||12.5||3.6||13 Sep||251.0|
|Holsworthy Control Range||23.6||36.8||14 Nov||11.3||1.4||13 Sep||233.0|
|Horsley Park Equestrian Centre AWS||23.9||37.0||14 Nov||12.1||2.9||13 Sep||303.0|
|Parramatta North (Masons Drive)||23.8||+0.2||37.2||14 Nov||12.5||+0.7||5.3||10 Sep||276.2||210.4||high||131%|
|Penrith Lakes AWS||25.0||38.7||14 Nov||12.5||3.4||13 Sep||268.6|
|Prospect Reservoir||24.0||+0.6||37.0||14 Nov||12.4||+0.5||4.0||13 Sep||252.0||180.2||high||140%|
|Richmond RAAF||24.4||36.8||14 Nov||11.4||0.9||13 Sep||257.6|
|Riverview Observatory||23.0||+0.5||36.7||14 Nov||13.2||+1.3||5.2||13 Sep||255.7||218.4||average||117%|
|Springwood (Valley Heights)||22.8||35.7||14 Nov||11.8||5.0||13 Sep||341.0||227.8||high||150%|
|Sydney (Observatory Hill)||23.0||+1.1||37.2||14 Nov||14.9||+1.5||7.4||10 Sep||257.4||230.1||average||112%|
|Sydney Airport AMO||23.2||+0.9||37.9||14 Nov||14.8||+1.9||6.6||10 Sep||246.6||213.6||average||115%|
|Terrey Hills AWS||21.8||35.8||14 Nov||13.2||5.8||10 Sep||363.0|
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 10 am on Thursday 1 December 2011. 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.