Sydney's 21st winter with above average temperatures

  • 21st consecutive winter with above average day-time temperatures
  • Wettest winter since 2007
  • Warm nights

Rainfall

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.

Temperature

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.

Wind

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.

Other phenomena

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.

Further information

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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
Lowest temperature
in winter 2010 (°C)
Previous lowest
for winter
Years of
record
Average for
winter
Prospect Reservoir -0.8 on 30 Jun -0.6 on 17 Jul 2007 46 6.8



Summary statistics for winter 2010
Maximum temperatures
for winter
(°C)
Minimum temperatures
for winter
(°C)
Rainfall
for winter
(millimetres)
Mean for
winter
2010
Diff
from
average
Highest for
winter
2010
Mean for
winter
2010
Diff
from
average
Lowest for
winter
2010
Total for
winter
2010
Average
for
winter
Rank of
winter
2010
Fraction of
winter
average
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

Notes

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 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