Sydney in August 2011: Warm end to winter

  • Below average rainfall.
  • 4th warmest August on record for mean temperatures.
  • Equal 3rd warmest August on record for minimum temperatures.
  • Warm start to the month, warmest spell on record this early in August.

Rainfall

Sydney Observatory Hill recorded 52.2 mm of rain during August, below the historical average of 80.8 mm but the wettest August since 2007. The rain fell over 12 days, slightly above the August average of 10 days, of which just two recorded more than 10 mm, both associated with offshore low pressure troughs and coastal showers. The first was on the 12th, with daily falls of 13 mm at Observatory Hill, while falls on the 20th reached 20.2 mm at Observatory Hill and up to 78 mm at Wisemans Ferry in the north west.

Sydney's water storage is currently at 78.9% of capacity, an increase of 0.8% from July levels and 21% higher than at this time in 2010. Current water storage information can be found on the Bureau of Meteorology Water Storage web site.

Temperature

The average maximum temperature at Observatory Hill was 19.8 °C during August, 2.0 °C above the historical average and the equal 7th warmest on record. Temperatures were above average throughout the Metropolitan region, but warmest in the eastern suburbs. The warm temperatures were particularly associated with a sustained warm spell in early August, with ten consecutive days above 20 °C between July 28 and August 6, reaching 25.7 °C on the 3rd. This is the fourth time such a warm spell has occurred during August, equal to 1954, 2006 and 2009, and the first time this early in the month.

The average minimum temperature was 10.7 °C, 1.8 °C above the historical average of 8.9 °C and the equal 3rd warmest on record for August, associated with below average sunshine during the month and a lack of cold nights. Twenty-one days had minimums above 10 °C during the month, twice the historical average and the equal 3rd highest on record, reaching 13.6 °C on the 30th and 13.7 °C on the 7th.

Mean temperatures were consequently 15.2 °C during August, 1.8 °C above the historical average and the 4th warmest on record.

Wind

There was no dominant wind direction at Sydney Airport during August, but southerly winds were less frequent than usual, while northerly winds were more than twice as common as typical for August. This contributed to the warm conditions during the month, particularly during the first week of August, with NNE to NW winds every day between the 3rd and 7th.

There were two strong wind days during the month, the fewest for August since 1999, with a maximum wind gust of 81 km/hr on the 19th, reaching 104 km/hr at Wattamolla. These strong winds caused minor damage in the northern and eastern suburbs from fallen trees and branches.

Other phenomena

Syndey Airport recorded 7.0 hours of sunshine during August, below the historical average of 7.8 hours. There was one thunderstorm at the Airport on the 7th, typical for August, associated with small hail of 5 to 10 mm.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in August 2011
Hottest day 27.2 °C at Sydney Olympic Park (Sydney Olympic Pk A on the 4th
Warmest days on average 20.1 °C at Sydney Olympic Park (Sydney Olympic Pk A
Coolest days on average 17.8 °C at Terrey Hills AWS
Coldest day 12.5 °C at Springwood (Valley Heights) on the 17th
Coldest night -1.2 °C at Camden Airport AWS on the 10th
Coolest nights on average 4.3 °C at Camden Airport AWS
Warmest nights on average 10.7 °C at Sydney (Observatory Hill)
Warmest night 14.3 °C at Sydney Airport AMO on the 7th
Warmest on average overall 15.2 °C at Sydney (Observatory Hill)
Coolest on average overall 11.9 °C at Camden Airport AWS
Wettest overall 108.1 mm at Webbs Ck-Wisemans Ferry (Hawkesbury Rive
Wettest day 78.0 mm at Webbs Ck-Wisemans Ferry (Hawkesbury Rive on the 20th
Highest wind gust104 km/hr at Wattamolla AWS on the 19th

Summary statistics for August 2011
Maximum temperatures
for August
(°C)
Minimum temperatures
for August
(°C)
Rainfall
for August
(millimetres)
Mean for
August
2011
Diff
from
average
Highest for
August
2011
Mean for
August
2011
Diff
from
average
Lowest for
August
2011
Total for
August
2011
Average
for
August
Rank of
August
2011
Fraction of
August
average
Badgerys Creek AWS 19.4   25.3 4th 5.4   0.2 11th 44.6
Bankstown Airport AWS 19.6 +0.7 25.9 4th 6.7 +0.7 1.7 10th 36.2 48.8 average 74%
Camden Airport AWS 19.5 +0.5 25.1 4th 4.3 +0.4 -1.2 10th 44.0 43.4 high 101%
Campbelltown (Mount Annan) 19.7   25.6 4th 5.3   -0.1 11th 54.8
Canterbury Racecourse AWS 19.3   25.6 3rd 6.9   1.4 11th 34.0
Holsworthy Control Range 19.4   25.5 4th 5.8   0.0 10th 43.2
Horsley Park Equestrian Centre AWS 19.1   25.1 4th 6.9   1.0 10th 32.4
Parramatta North (Masons Drive) 19.6 +0.6 25.8 4th 7.7 +0.6 4.1 10th 55.0 55.3 high 99%
Penrith Lakes AWS 20.0   25.9 4th 6.7   1.6 10th 28.4
Prospect Reservoir 19.2 +0.5 25.2 4th 7.4 +0.6 2.6 10th 33.6 50.1 average 67%
Richmond RAAF 19.7   26.1 4th 5.1   -0.2 10th 28.8
Riverview Observatory 19.4 +1.1 26.1 3rd 8.6 +1.4 4.9 11th 45.2 70.8 average 64%
Springwood (Valley Heights) 18.1   25.5 3rd 8.0   3.8 10th 33.2 53.8 average 62%
Sydney (Observatory Hill) 19.8 +2.0 25.7 3rd 10.7 +1.8 7.3 11th 52.2 80.6 average 65%
Sydney Airport AMO 19.4 +1.1 25.9 3rd 10.4 +2.3 5.6 11th 42.6 76.3 average 56%
Sydney Olympic Park (Sydney Olympic Pk A 20.1   27.2 4th 9.3   5.2 10th 32.0
Terrey Hills AWS 17.8   24.0 4th 9.3   4.7 10th 61.0

Daily rainfall
Hunter (61)12345678910111213141516171819202122232425262728293031
Webbs Ck-Wisemans Ferry (Hawkesbury Rive - - 0.5 - - - 0.5 18.0 - 0.2 - - 0.5 - - - - 3.0 - 78.0 5.0 1.0 0.5 - - - 0.2 - 0.2 0.5 -
Central Tablelands (South) (63)12345678910111213141516171819202122232425262728293031
Sackville Ferry (Hawkesbury River) - - - - - - 1.4 4.2 - - - 1.4 - 0.2 7.2 0.2 - 6.2 0.2 46.8 0.6 0.6 0.4 0.4 0.2 - 0.8 - - - -
Springwood (Valley Heights) - - - - - - 1.0 4.2 - - - 0.2 - - - - 0.2 10.6 0.2 15.0 1.6 0.2 - - - - - - - - -
Valley Heights (Sun Valley Rd)
-
- -

















- -
-
- - -
Metropolitan (East) (66)12345678910111213141516171819202122232425262728293031
Abbotsford (Blackwall Point Rd)











»» 1.4


8.0
71.2
3.0 »» »» »» »» »» 0.5 »» - -
Auburn (Rosnay Golf Club) - - - - - - - 4.0 - - - 7.0 - - - - - 8.0 - 16.0 - - - - - - - - - - -
Audley (Royal National Park) - - - - - - 2.0 8.0 - - - 16.0 1.0 5.0 1.0 - 2.0 9.0 3.0 19.0 3.0 - - - - - 1.0 - - - -
Avalon (Wollstonecraft Ave) - - - - - - 1.0 21.0 - - - 5.0 1.0 5.0 3.0 - 1.0 5.0 - 23.0 - - - - - - - - - - -
Avalon Beach (Avalon (Palmgrove Rd))





2.0



8.0



4.6 6.0
28.0
0.4 0.8







Bankstown Airport AWS - - - - - - 1.2 1.2 - - - 8.4 - 0.4 - - - 8.4 0.8 13.6 2.0 - 0.2 - - - - - - - -
Belrose (Evelyn Place)





2.6 4.8 1.0

7.0 1.4

1.0 0.2 5.8 0.4 17.0 2.2 1.4 1.0 1.0

0.2


-
Campbelltown (Ingleburn (Long Point)) - - - - - - 2.0 7.0 - - - 5.0 - - - - - 16.0 1.0 38.0 3.0 - - - - - - - - - -
Canterbury Racecourse AWS - - - - - - 0.4 1.0 - - - 6.2 1.4 0.4 - - 0.2 7.4 0.8 13.8 - 0.4 0.2 0.2 0.2 - - 0.2 - - 1.2
Castle Cove (Rosebridge Ave)






6.0


7.0
2.5


7.0
35.0 1.0 2.0 0.5 1.0






Chatswood Bowling Club - - - - - - - 3.0 1.0 - - 11.0 1.0 - 3.0 - - 5.0 2.0 32.0 1.0 1.0 - 1.0 - - 1.0 - - - -
Collaroy (Long Reef Golf Club)






7.2 1.4

7.4 0.8 17.4 3.8

3.6
29.6 1.0 1.6








Concord Golf Club





1.2
1.2

8.2 0.2



8.8 1.2 17.0 1.0









Cronulla South Bowling Club 5.0









9.2 2.6 »» 4.4
10.0 8.0 1.4 19.0








8.2 1.0
Guildford (Woodville Golf Club) - - - - - - 1.0 4.0 - - - 8.0 - - - - - 8.0 - 14.0 1.0 - - - - - - - - - -
Holsworthy Control Range - - - - - - 2.2 2.8 0.2 - - 4.0 - 0.4 - - 0.2 9.0 0.8 21.2 1.4 0.6 - - - - 0.2 0.2 - - -
Lidcombe (Carnarvon Golf Club) - - - - - - - 5.0 - - - 4.0 1.0 - - - - 8.0 1.0 7.0 - - - - - - - - - - -
Liverpool-Scrivener St (Georges River) - - - - - - - 6.0 - - - 3.0 - - - - - 9.0 - 10.0 3.0 - - - - - - - - - -
Lucas Heights (ANSTO)





1.6 4.2


7.4
2.6

0.2 11.0 0.8 31.0 3.0 0.4








Macquarie Park (Willandra Village)










7.8
3.8 0.6 1.0
6.4 1.0 24.8 2.8 0.8 0.4







Manley / Warringah (Allambie) - - - - - - 2.5 5.0 - - - 9.5 0.5 1.5 0.5 - - 4.5 - 16.0 - 1.0 - - 0.5 20.5 - - - - -
Manley / Warringah (Belrose)

- - - - 1.0 3.0 0.5 -
7.0 2.0 - - 2.0 - 5.0 - 27.0 2.0 0.5 0.5 1.0 -
-
-
-
Marrickville Golf Club - - - - - - - 2.0 - - - 7.0 1.0 2.0 - - 2.0 7.0 1.0 14.0 - 1.0 - - - 1.0 - - - - -
Milperra Bridge (Georges River)





























-
Mona Vale Golf Club - - 0.4 - 0.2 - 1.4 11.0 1.8 - - 8.8 1.2 0.6 3.6 0.2 1.6 6.0 - 31.8 0.4 0.8 0.8 0.4 0.2 0.2 0.4 0.2 0.2 - -
Parramatta (Erts) - - 0.5 - - - - 0.5 - - - 4.0 - - - - - 6.0 0.5 12.0 - - - - - - - - - - -
Parramatta North (Masons Drive) - - 0.4 - - - 0.2 2.6 0.2 - - 6.0 1.0 - - - - 8.4 1.6 32.4 1.2 0.4 - - - - 0.4 - - - 0.2
Peakhurst Golf Club - - - - - - 1.0 2.0 - - - 9.0 1.0 3.0 - - - 9.0 1.0 12.0 2.0 - - - - - - - - - -
Randwick Bowling Club -





3.4


6.4 3.4 3.2 3.0 0.4 3.0 6.8 1.0 12.2 1.2 0.2
0.2






Riverview Observatory - - - - - - 0.8 3.6 0.6 0.5 - 8.8 1.2 0.3 »» 0.6 - 6.4 1.0 17.8 2.4 0.2 0.2 0.4 - - 0.2 - 0.2 - -
Rose Bay (Royal Sydney Golf Club)





0.8 3.4


6.2 4.4 3.8 3.2 4.4 8.2 5.8
25.0 0.8 0.2
0.2

0.2

0.2 8.0
Sans Souci (Public School) - - - - - - - 3.0 - - - 8.0 3.0 3.0 - - 3.0 6.0 1.0 11.0 2.0 - - - - - 1.0 - - - -
St Ives (Richmond Avenue)

1.0


2.2 4.2 0.2

5.0 1.6
0.2 0.4
6.6 0.6 44.8 3.0 2.6 1.4 2.4

0.4



Strathfield Golf Club - - - - - - - 1.0 - - - 9.0 1.0 - - - - 8.0 1.0 16.0 - - - - - - - - - - -
Sydney (Observatory Hill) - - - - - - 0.6 4.4 - - - 13.0 2.6 1.0 0.6 - - 5.6 0.8 20.2 2.2 - - 1.0 0.2 - - - - - -
Sydney Airport AMO
- - - - - - 2.8 0.2 - - 9.4 1.6 3.2 0.2 0.2 3.8 6.8 0.6 13.0 - - - 0.6 0.2 - - - - - -
Sydney Olympic Park (Sydney Olympic Pk A - - - - - - 0.2 0.6 - - - 9.6 0.2 0.2 - - - 8.0 1.0 11.6 0.2 0.2 0.2 - - - - - - -
Terrey Hills AWS - - - -
- 1.8 4.6 2.0 - - 8.0 1.2 - 0.8 0.4 1.4
0.2 35.4 1.8 1.4 1.0 0.4 - - 0.2 0.2 - - 0.2
Turramurra (Kissing Point Road)

0.2 0.2

2.4 3.0 0.2

8.4 2.6 0.4

0.2 7.8 0.6 40.2 1.0 2.0 0.4 0.4





-
Metropolitan (West) (67)12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield City Farm) - - - - - - 1.0 5.0 - - - 2.0 - - - - - 9.0 - 14.0 1.0 - - - - - - - - - -
Badgerys Creek AWS - - - -
- 1.0 5.0 - - - 2.4 0.2 - 0.2 - - 12.8 0.6 20.4 1.0 0.2 - 0.2 - 0.2 0.2 - 0.2 - -
Baulkham Hills (Swimming Pool ) - - 2.5 - - - 0.5 0.5 - - - 5.0 2.0 - - - - 7.0 1.0 35.5 1.5 - - - - - - - - - -
Baulkham Hills Eucalyptus Ct - - 1.5 - - - - 2.0 - - - 5.5 1.0 - - - - 7.0 1.0 33.0 0.5 - - - - - - - - - -
Berowra (Goodwyn Road)

0.6



6.4


3.4 »» 1.4


6.2
58.8 3.0 2.8 3.6






-
Blacktown (Dog Pound) - 0.5 0.5 - - - - 5.0 0.5 - - 3.5 1.0 - - - - 8.0 0.5 12.5 - - - - - - - - - - -
Box Hill (Hynds Road) - - - - - - 1.0 1.0 - - - 5.0 - - - - - 7.0 - 52.0 1.0 - - - - - - 1.0 - - -
Castle Hill (Kathleen Ave)

0.1


1.8 1.2


5.6 1.8



7.8 1.2 38.2 1.0 0.2



0.3



Glenorie (Old Northern Rd)





3.0 4.0


3.0




7.4
50.0 1.0 3.4 1.4


1.0



Greystanes (Cumberland Golf Club) - - - - 1.0 - - 3.5 0.5 - - 5.5 0.5 - - - - 7.5 0.5 14.5 - - - - - - - - - - -
Hawkesbury River (Sackville Downstream)
- - - - - - 3.5 - - - - - 0.5 6.5 - - 4.5 - 40.5 1.0 0.5 - 0.5 - -

- - -
Horsley Park Equestrian Centre AWS - - - -
- 1.6 2.4 0.2 - - 1.8 0.2 0.2 - - - 8.0 0.4 14.8 2.0 - - 0.2 - 0.2 0.2 0.2 - - -
Kelso Ck (Kelso Creek U/S Levee (Georges - - - - 0.5 - 0.5 7.0 - - - 10.0 - 1.0 - - 0.5 8.5 0.5 11.0 2.5 0.5 - - - - - - 0.5 - -
Kings Langley (NSW Soccer Federation) - 0.5 - - - - - 3.5 0.5 - - 6.0 1.0 - - - 0.5 7.0 0.5 30.0 0.5 0.5 - - - - - - 0.5 - -
Kings Langley (Solander Rd) - - - - - - 0.2 1.6 - - - 6.4 1.6 - - - - 7.0 0.8 25.6 0.8 - - - - - - - - - -
Liverpool (Michael Wenden Centre) - - - - - - 3.4 2.6 »» »» »» 2.6











- -




Lower Portland (Hawkesbury River) - - - - - - 1.8 6.6 - - - 1.0 - 0.2 0.4 - - 5.8 0.2 71.2 1.2 0.8 1.2 0.2 0.2 - - - - 0.2 -
Maroota (Tobruk) 0.4 0.4 0.4 0.4 0.4 0.2 0.4 0.2 0.4 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 - 0.2 - - - 0.2 - 0.2 - - 0.2 - 0.2
Merrylands West (Finlayson Creek) - 2.5 - - - - - 15.0 0.5 - 1.0 10.0 - - - - - 11.0 0.5 21.0 - - - - - - - - - - -
North Parramatta (Burnside Homes) - 0.5 - - - - - 2.0 - - - 5.0 0.5 - - - - 7.0 1.0 29.0 0.5 - - 0.5 - - - - - - -
North Rocks (Muirfield Golf Club) - - - - 2.0 - 0.5 0.5 - - - 7.5 1.0 - - - - 8.0 2.5 32.5 0.5 0.5 - - - - - - - - -
Northmead Bowling Club - - - 0.5 - - - 1.5 - - - 5.0 1.0 - - - - 6.5 1.0 24.5 0.5 0.5 - - - - - - - - -
Parramatta (Baulkham Hills West (Sierra - - 1.5 - - - - 1.5 - - - 6.5 0.5 - - - - 6.5 0.5 20.5 1.0 - - - - - - - - - -
Penrith Lakes AWS - 0.4 - - - - 0.4 0.8 - - - 0.2 0.4 - - - - 11.2 0.2 12.8 1.6 - - - - 0.2 - - 0.2 - -
Prospect Reservoir - - - - - - 0.7 4.0 0.8 - - 4.6 0.4 - - - - 8.2 0.8 13.5 0.3 0.2 0.1 - - - - - - - -
Richmond RAAF 0.4 0.2 - - - - 1.0 0.4 - - - 0.4 - - - - 0.2 7.0 - 18.6 0.2 - - 0.2 - - 0.2 - - - -
Seven Hills (Radio FM 103.2) - - 2.0 - - - 0.5 1.0 - - - 4.5 0.5 - - - - 7.5 0.5 20.0 0.5 - - - - - - - - - -
Seven Hills (Collins St)




2.4 1.4



5.2




8.6
23.6 1.4









South Creek (Elizabeth Drive) - - - - - - 0.2 0.4 - - - 0.2 - - - - - 1.2 0.1 1.7 0.1 - - - - - 0.1 - - - -
St Clair (Juba Close) - - - - - - - 1.0 - - - 1.0 - - - - - 10.0 - 9.0 1.0 - - - - - - - - - -
Toongabbie Bowling Club - 1.0 - - - - - 2.0 - - - 5.5 1.0 - - - - 6.5 1.0 20.5 0.5 - - - - - - - - - -
Toongabbie Ck (Redbank Road (Toongabbee - - 11.0 - - - - 1.0 1.0 - - 5.5 0.5 - - - - 7.5 1.0 19.0 1.0 - - - - - - - - - -
West Pennant Hills (Cumberland S F Alert - - - 1.5 - - 1.0 2.0 - - - 6.5 1.0 - - - - 7.0 1.0 26.5 2.5 - - - - - - - - - -
Willmot (Resolution Ave) - - - - - - - -
- - 1.0 - - - - - 8.0 - 12.0 - - - - - - - - - - -
Windsor SWC (Hawkesbury River) 1.0 1.0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Illawarra (68)12345678910111213141516171819202122232425262728293031
Camden Airport AWS - - - 0.2 - - 1.6 2.6 - - - 1.4 - - - - - 17.8 1.0 14.6 4.2 0.4 - - - - - 0.2 - - -
Camden Valley Golf Resort - - - - - - 2.0 18.0 1.0 - - 2.0 - - - - - 12.0 2.0 25.0 2.0 - - - - - - - - - -
Campbelltown (Kentlyn (Georges River Roa - - - - - - 1.0 19.0 - - - - - - - - 1.0 -


- - - 1.0 - - - - - -
Campbelltown (Mount Annan) - - - - - - 3.0 8.2 - - - 3.0 - - - - - 13.6 1.2 22.8 2.2 0.2 0.4 - - - - - 0.2 - -
Rossmore (South Creek) - - - - - - 2.0 5.0 - - - 3.0 - - - - - 12.0 1.0 22.0 2.0 - - - - - - - 1.0 - -

Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with »» are part of a longer accumulation, which is marked like this on the final day. Values over 100 mm have been rounded to the nearest whole millimetre. Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
This table is very wide; you may have to scroll sideways to see all the days, and you may need to set the paper to 'landscape' to print.


Notes

A Monthly 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 September 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 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