Wednesday, 1 September 2010 - Seasonal Climate Summary for Sydney - Greater Sydney - Product code IDCKGC25L0
Sydney's 21st winter with above average temperatures
- 21st consecutive winter with above average day-time temperatures
- Wettest winter since 2007
- Warm nights
Sydney Observatory Hill recorded 288.8 mm of rain during winter 2010, which is slightly below the historical average of 310.0 mm, and the wettest since 2007 (730.0 mm). The majority of the rain fell in the early part of the season, with above average rainfall in both June and July but below average rainfall during August. Eight days during the season had rainfall of over 10 mm, approximately average for winter, with the most significant falls associated with an East Coast Low between the 4th and 5th of June, reaching 114.4mm at Collaroy on the 5th.
Average maximum temperatures during winter at Sydney Observatory Hill were 17.7°C, 0.7°C above the historical winter average of 17.0°C. It has now been over twenty years since Sydney last experienced below average winter maximums in 1989 (16.8°C). This is unprecendented in the historical record for Sydney Observatory Hill (records since 1939). Temperatures were fairly consistent across the metropolitan region, although Prospect Reservoir recorded its lowest winter maximum temperature since 1990.
Average minimum temperatures at Sydney Observatory Hill were 9.4 °C during winter 2010, 0.7 °C above the historical average of 8.7°C. Most of the Sydney Basin also recorded warmer than average winter nights, except western areas which reported cooler than average temperatures. Temperatures were coolest during late June and July. Prospect Reservoir recorded its coldest night on record on June 30th (-0.8 °C), and temperatures reached as low as -4.8°C at Richmond on the same night.Some sites had their lowest winter temperature on record.
Prevailing winds during winter were northwesterly to southwesterly, forming 85% of morning winds and 50% of afternoon winds, which is approximately average for winter. The strongest wind gust was 107km/hr at Sydney Airport on August 3rd, associated with a coastal low pressure system.
Sydney Airport recorded an average of 6.7 hours of sunshine during winter, slightly below the historical average of 6.8 hours. This was a result of the well below average sunshine hours and cloudy conditions experienced during July, with both June and August recording above average sunshine. Four thunderstorms were reported at Sydney Airport during winter, which is approximately average for the season.
|Extremes in winter 2010|
|Hottest day||25.4 °C at Sydney Airport AMO on 19 Aug|
|Warmest days on average||
18.0 °C at Liverpool (Michael Wenden Centre)|
18.0 °C at Sydney Olympic Park (Sydney Olympic Pk A
|Coolest days on average||
16.0 °C at Springwood (Valley Heights)|
16.0 °C at Terrey Hills AWS
|Coldest day||10.8 °C at Richmond RAAF on 2 Jul|
|Coldest night||-4.8 °C at Richmond RAAF on 30 Jun|
|Coolest nights on average||4.4 °C at Camden Airport AWS|
|Warmest nights on average||9.4 °C at Sydney (Observatory Hill)|
|Warmest night||15.3 °C at Sydney Airport AMO on 4 Jun|
|Wettest overall||343.6 mm at Rose Bay (Royal Sydney Golf Club)|
|Wettest day||114.4 mm at Collaroy (Long Reef Golf Club) on 5 Jun|
|Highest wind gust||
107 km/h at Sydney Airport AMO on 3 Aug|
|Record lowest winter temperature|
in winter 2010 (°C)
|Prospect Reservoir||-0.8||on 30 Jun||-0.6||on 17 Jul 2007||46||6.8|
|Summary statistics for winter 2010|
|Central Tablelands (South) (district 63)|
|Springwood (Valley Heights)||16.0||22.7||19 Aug||7.0||0.0||30 Jun||156.8||188.9||average||83%|
|Metropolitan (East) (district 66)|
|Bankstown Airport AWS||17.6||-0.3||24.7||19 Aug||6.4||+0.5||-0.7||30 Jun||147.0||168.2||average||87%|
|Canterbury Racecourse AWS||17.6||24.5||19 Aug||6.6||-0.9||30 Jun||182.4|
|Holsworthy Control Range||17.6||24.1||19 Aug||5.9||-2.6||30 Jun||162.8|
|Parramatta North (Masons Drive)||17.7||-0.4||24.6||19 Aug||6.9||0.0||1.0||30 Jun||184.4||186.3||average||99%|
|Riverview Observatory||17.6||+0.2||24.4||19 Aug||8.0||+0.9||1.2||30 Jun||266.6||269.8||average||99%|
|Sydney (Observatory Hill)||17.7||+0.7||24.6||19 Aug||9.4||+0.7||4.3||30 Jun||288.8||309.8||average||93%|
|Sydney Airport AMO||17.5||-0.1||25.4||19 Aug||9.3||+1.4||3.2||30 Jun||209.8||266.5||average||79%|
|Sydney Olympic Park (Sydney Olympic Pk A||18.0||25.0||19 Aug||8.6||2.0||30 Jun||179.2|
|Terrey Hills AWS||16.0||23.3||19 Aug||8.1||0.9||30 Jun||279.2|
|Metropolitan (West) (district 67)|
|Badgerys Creek AWS||17.4||23.4||19 Aug||5.5||-3.0||30 Jun||154.8|
|Horsley Park Equestrian Centre AWS||17.2||23.3||19 Aug||6.6||-1.8||30 Jun||147.6|
|Liverpool (Michael Wenden Centre)||18.0||24.4||19 Aug||5.5||-2.4||30 Jun||150.9|
|Penrith Lakes AWS||17.8||24.7||19 Aug||6.3||-1.1||30 Jun||131.2|
|Prospect Reservoir||17.3||-0.4||23.8||19 Aug||7.0||+0.2||-0.8||30 Jun||139.3||182.4||average||76%|
|Richmond RAAF||17.7||24.8||19 Aug||4.8||-4.8||30 Jun||108.8|
|Illawarra (district 68)|
|Camden Airport AWS||17.6||-0.4||24.5||19 Aug||4.4||+0.7||-3.9||30 Jun||171.0||144.5||average||118%|
|Campbelltown (Mount Annan)||17.8||24.1||19 Aug||4.8||-3.0||30 Jun||159.2|
A Seasonal Climate Summary is prepared to list the main features of the weather in 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 9 am on Wednesday 1 September 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.