Monday, 3 December 2012 - Seasonal Climate Summary for Sydney - Product code IDCKGC15L0
Sydney Observatory Hill recorded 105.2 mm of rain during spring, well below the historical average of 229.3 mm. This was the driest spring since 2002, with below average rainfall recorded across the city and in all three months.
The rain fell over 35 days, normal for spring, but only seven recorded at least 5 mm (average 11 days), the fewest since 2002. No days recorded at least 15 mm (average 4 days) for only the 10th time on record, with the wettest day at Sydney Observatory Hill reaching just 13.2 mm on September 29. Most of the rain during the season was associated with thunderstorms or coastal trough systems, which brought higher falls to some suburbs.
The average maximum temperature at Sydney Observatory Hill during spring was 23.3 °C, 1.4 °C above the historical average. This is the warmest spring since 2009, and the 17th consecutive warm spring for Sydney. Temperatures were above average throughout the season and across the city, associated with generally dry and sunny conditions during the season as well as several hot days. Seven days reached at least 30 °C in the city (average 4 days), while only two were cooler than 18 °C (average 14 days); this is only the second time on record with so few cool days.
The average minimum temperature at Sydney Observatory Hill was 14.2 °C, 0.8 °C above the historical average. This was the coolest spring since 2003 in the city, while nights were slightly below average at shorter-record stations in western Sydney. Temperatures were particularly cool at the start of the season, with a cold spell breaking records on September 1 and giving the city its coldest spring night since 1995, while a cold snap in mid-October resulted in two consecutive nights below 9 °C, the first such spell since 2003.
See a list of spring temperature records.
The prevailing wind direction at 3pm was easterly, with 41% of winds between E and NE and 44% between ESE and S, slightly above normal for spring. There were 24 strong wind days at Sydney Airport during the season, with the strongest wind gust reaching 89 km/hr on November 18, while wind gusts in western Sydney reached 107 km/hr during a thunderstorm on 8 Nov.
Seven thunderstorms were reported at Sydney Airport, with seventeen storms reported anywhere in the metropolitan area. There were an average of 8.3 hours of bright sunshine during the season, above the historical average of 7.7 hours and the sunniest spring since 2007. Conditions were particularly sunny during September and October, with below average sunshine during November.
|Extremes in spring 2012|
|Hottest day||39.3 °C at Parramatta North (Masons Drive) on 30 Nov|
|Warmest days on average||26.0 °C at Penrith Lakes AWS|
|Coolest days on average||22.5 °C at Terrey Hills AWS|
|Coldest day||13.9 °C at Terrey Hills AWS on 12 Oct|
-1.8 °C at Camden Airport AWS on 1 Sep|
|Coolest nights on average||
9.1 °C at Camden Airport AWS|
|Warmest nights on average||
14.2 °C at Sydney (Observatory Hill)|
14.2 °C at Sydney Airport AMO
21.8 °C at Sydney Airport AMO on 30 Nov|
|Warmest on average overall||
18.9 °C at Sydney Airport AMO|
|Coolest on average overall||
17.1 °C at Camden Airport AWS|
17.1 °C at Campbelltown (Mount Annan)
138.0 mm at Castle Cove (Rosebridge Ave)|
45.0 mm at Maroota (Old Telegraph Road) on 19 Sep|
|Highest wind gust||
107 km/h at Penrith Lakes AWS on 8 Nov|
|Record lowest spring temperature|
in spring 2012 (°C)
|Prospect Reservoir||1.7||on 1 Sep||2.6||on 22 Sep 1994||47||11.9|
|Parramatta North (Masons Drive)||0.7||on 1 Sep||1.4||on 7 Sep 1995||46||11.8|
|Camden Airport AWS||-1.8||on 1 Sep||-1.0||on 14 Sep 1972||37||9.9|
|Summary statistics for spring 2012|
|Badgerys Creek AWS||25.3||38.4||30 Nov||9.7||-0.2||1 Sep||106.2|
|Bankstown Airport AWS||24.6||+1.1||39.1||30 Nov||11.2||-0.4||2.7||1 Sep||86.2||183.0||v low||47%|
|Camden Airport AWS||25.2||+1.2||37.5||30 Nov||9.1||-0.8||-1.8||1 Sep||102.0||182.0||low||56%|
|Campbelltown (Mount Annan)||24.9||37.0||30 Nov||9.3||0.6||3 Sep||114.4|
|Canterbury Racecourse AWS||23.3||34.0||25 Nov||11.4||2.7||1 Sep||104.2|
|Holsworthy Aerodrome AWS||24.4||38.3||30 Nov||10.8||2.2||1 Sep||104.4|
|Holsworthy Control Range||24.3||37.7||30 Nov||10.1||0.8||1 Sep||96.4|
|Horsley Park Equestrian Centre AWS||24.8||38.1||30 Nov||10.9||2.4||1 Sep||107.2|
|Parramatta North (Masons Drive)||24.3||+0.7||39.3||30 Nov||11.2||-0.6||0.7||1 Sep||99.4||208.1||low||48%|
|Penrith Lakes AWS||26.0||38.4||30 Nov||11.4||2.2||1 Sep||125.4|
|Prospect Reservoir||25.1||+1.6||38.8||30 Nov||11.5||-0.4||1.7||1 Sep||92.6||179.5||low||52%|
|Richmond RAAF||25.9||38.8||30 Nov||9.9||-1.4||1 Sep||90.0|
|Riverview Observatory||23.2||+0.7||33.5||5 Oct||11.9||0.0||3.3||1 Sep||102.1||217.1||low||47%|
|Springwood (Valley Heights)||23.8||36.2||30 Nov||11.4||3.2||1 Sep||124.0||227.0||low||55%|
|Sydney (Observatory Hill)||23.3||+1.4||34.2||5 Oct||14.2||+0.8||5.5||1 Sep||105.2||229.3||low||46%|
|Sydney Airport AMO||23.6||+1.3||35.6||5 Oct||14.2||+1.2||5.1||1 Sep||83.2||212.2||low||39%|
|Terrey Hills AWS||22.5||33.5||5 Oct||12.6||4.2||1 Sep||116.2|
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 8 am on Monday 3 December 2012. 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.