Sydney in September 2010: Dry, warm start to spring

  • Below average rainfall
  • 16th consecutive September with warmer than average nights
  • Warm days

Rainfall

Sydney Observatory Hill recorded 42.2mm of rain during September 2010, which is below the historical average of 69.1mm. However, this is the wettest September since 2008 for Sydney, when 99.2mm of rainfall was recorded. The rain fell over ten days, with the most significant falls occurring on the 15th (21.0mm), associated with the passage of a complex low pressure system across the State. Rainfall from the 2nd to the 5th, associated with a deep low over South Australia, contributed 12.0mm to the month's total, while light falls on the10th/11th, 22nd/23rd and 30th amounted to just 9.2mm.

The below average rainfall experienced by Sydney is in stark contrast to that experienced across Australia, including inland regions of NSW. It was Australia's wettest September on record (see Special Climate Statement 22), associated with a moderate to strong La Niña event, now well established in the Pacific Ocean. The rainfall distribution across NSW during the month (wet in the west, drier in the east) is typical of that experienced during a La Niña event. Long-range models surveyed by the Bureau of Meteorology suggest the central Pacific will continue to exceed La Niña thresholds through spring, with the majority indicating the La Niña event will continue into at least early 2011. For routine updates and comprehensive discussion on any developments regarding El Niño and La Niña, please see the ENSO Wrap-Up.

Sydney's water storage is currently at 57.8% of capacity. This is an increase of 0.3% from August levels, but 0.2% lower than September 2009. Current water storage information can be found on the new Bureau of Meteorology Water Storage Beta Release web site.

Temperature

The average maximum temperature at Sydney Observatory Hill for September was 21.0°C, which is 1.0°C above the historical September average of 20.0°C. This is 2.1°C cooler than September 2009, which reached an average of 23.1°C.

The warmest temperature recorded in the Sydney area during the month was 29.8°C at Penrith Lakes AWS on the 27th, when warm northwesterly winds sent temperatures soaring across the Metropolitan - Sydney recorded 27.1°C on the same day. There were no days above 30°C, which, although average for September, is below the 3 days experienced last September during an El Niño event.

The average minimum temperature at Observatory Hill during September was 12.3°C, which is 1.2°C above the historical average of 11.1°C. This is now the 16th consecutive September with above average minimum temperatures at Sydney Observatory Hill. There were generally warmer than average minimum temperatures across the Metropolitan region, particularly on the 2nd and the 5th, associated with enhanced cloud cover.

Wind

West-northwesterly winds prevailed at Sydney Airport during September mornings, for 60% of the time. Afternoon winds were dominated by northeasterly and south-southeasterly seabreezes, for 60% of the time. Three strong wind days were reported at Sydney Airport (average 5), with a maximum wind gust of 91 km/hr on the 5th associated with a deep low pressure system over Bass Strait.

Other phenomena

Sunshine averaged 7.3 hours at Sydney Airport during September, below the historical average of 7.9 hours and the lowest average sunshine for September since 2004 (7.1 hours). Only one thunderstorm was reported at Sydney Airport on the 14th , which is about average for this time of year.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in September 2010
Hottest day 29.8°C at Penrith Lakes AWS on the 27th
Warmest days on average 22.2°C at Penrith Lakes AWS
Coolest days on average 19.6°C at Terrey Hills AWS
Coldest day 14.7°C at Richmond RAAF on the 3rd
Coldest night 2.0°C at Campbelltown (Mount Annan) on the 8th
Coolest nights on average 7.3°C at Camden Airport AWS
Warmest nights on average 12.3°C at Sydney (Observatory Hill)
Warmest night 16.9°C at Sydney Airport AMO on the 5th
Wettest overall 100.2mm at Turramurra (Kissing Point Road)
Wettest day 69.0mm at Chatswood Bowling Club on the 15th
Highest wind gust 91 km/h at Sydney Airport AMO on the 5th




Summary statistics for September 2010
Maximum temperatures
for September
(°C)
Minimum temperatures
for September
(°C)
Rainfall
for September
(millimetres)
Mean for
September
2010
Diff
from
average
Highest for
September
2010
Mean for
September
2010
Diff
from
average
Lowest for
September
2010
Total for
September
2010
Average
for
September
Rank of
September
2010
Fraction of
September
average
Central Tablelands (South) (district 63)
Springwood (Valley Heights) 20.4   27.0 27th 8.9   3.9 17th 35.2 55.6 average 63%
Metropolitan (East) (district 66)
Bankstown Airport AWS 21.4 -0.1 27.3 27th 9.2 +0.6 4.9 18th 45.4 44.7 average 102%
Canterbury Racecourse AWS 20.9   27.0 27th 9.2   4.8 18th 65.6
Holsworthy Control Range 21.3   27.0 27th 8.2   3.4 8th 49.0
Parramatta North (Masons Drive) 21.7 +0.1 27.8 27th 9.1 -0.2 4.9 30th 39.9 53.4 average 75%
Riverview Observatory 20.9 +0.2 27.2 27th 10.2 +0.8 6.3 30th 80.2 62.3 high 129%
Sydney (Observatory Hill) 21.0 +1.0 27.1 27th 12.3 +1.2 8.2 8th 42.2 68.9 average 61%
Sydney Airport AMO 21.1 +0.6 28.2 28th 11.9 +1.6 7.5 8th 31.8 60.8 average 52%
Sydney Olympic Park (Sydney Olympic Pk A 22.0   29.1 27th 11.2   7.2 8th 69.8
Terrey Hills AWS 19.6   26.1 27th 10.3   5.1 18th 75.6
Metropolitan (West) (district 67)
Badgerys Creek AWS 21.2   26.9 27th 7.8   3.1 17th 41.8
Horsley Park Equestrian Centre AWS 21.0   27.0 27th 8.7   3.4 18th 58.8
Liverpool (Michael Wenden Centre) 21.7   27.2 28th 8.4   3.0 8th 40.3
Penrith Lakes AWS 22.2   29.8 27th 8.9   3.5 17th 26.4
Prospect Reservoir 21.8 +0.5 27.2 27th 9.2 -0.2 4.4 17th 29.9 47.1 average 63%
Richmond RAAF 21.9   28.8 27th 7.4   2.2 17th 25.0
Illawarra (district 68)
Camden Airport AWS 21.5 -0.4 27.7 27th 7.3 +0.6 2.1 12th 48.0 39.7 average 121%
Campbelltown (Mount Annan) 21.4   26.8 28th 7.6   2.0 8th 55.2

Daily rainfall

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.

Hunter (61)123456789101112131415161718192021222324252627282930
Webbs Ck-Wisemans Ferry (Hawkesbury Rive - - 2.0 8.5 0.2 - - - - 4.0 0.5 0.5 - - 14.0 - - - - - - - - - - - - - - -
Central Tablelands (South) (63)123456789101112131415161718192021222324252627282930
Sackville Ferry (Hawkesbury River) - 0.2 5.8 18.4 0.6 - - - - 3.8 0.4 - - - 11.0 - 0.4 - - 0.2 - - 0.2 - - - - - - -
Springwood (Valley Heights) - 0.2 6.4 12.8 0.4 - - - - 0.8 0.2 - - - 12.0 - - - - - - 2.0 0.4 - - - - - - -
Valley Heights (Sun Valley Rd) -
6.0 12.4 0.4
- - 0.4 1.4
- - - 14.2 - - - - - - 2.0 0.8 - - - - - - -
Metropolitan (East) (66)123456789101112131415161718192021222324252627282930
Abbotsford (Blackwall Point Rd)
2.0 2.0 14.0




3.0



33.0













0.4
Auburn (Rosnay Golf Club) - 2.0 2.0 15.0 - - - - - 2.0 - - - - 14.0 - - - - - - - - - - - - - - -
Audley (Royal National Park) - 1.0 8.0 17.0 1.0 - - - - 1.0 2.0 - - 1.0 22.0 - - - - - - - - - - - - - - -
Avalon (Wollstonecraft Ave) - - 2.0 13.0 1.0 - - - - 5.0 - - - 2.0 27.0 - - - - - - 1.0 - - - - - - - -
Avalon Beach (Avalon (Palmgrove Rd))
0.2 3.2 14.2




5.2


0.4 22.2














Bankstown Airport AWS - 0.4 4.2 16.4 0.4 - - - - 4.4 0.2 - - - 18.8 - - - - - 0.4 - - - - - - 0.2 - -
Belrose (Evelyn Place)
0.8 4.4 16.2 1.2
0.4 »» »» 4.6 2.2
»» »» 41.4





1.4






0.1
Campbelltown (Ingleburn (Long Point)) - - - 19.0 - - - - - 1.0 - - - - 35.0 - - - - - - - - - - - - - - 2.0
Canterbury Racecourse AWS - 1.6 1.0 16.6
- - - - 2.6 - - - - 41.6 0.2 - - - - - - - - - - - - - 2.0
Castle Cove (Rosebridge Ave)

2.0 17.0 1.0




1.5


54.0





2.0







Chatswood Bowling Club - - 3.0 10.0 1.0 - - - - 4.0 2.0 - - - 69.0 - - - - - - 1.0 - - - - - - - 4.0
Collaroy (Long Reef Golf Club)

1.6 15.2


1.0
3.8 1.4


20.4













1.6
Concord Golf Club
1.6 1.6 18.2 0.6


3.2




27.0














Cronulla South Bowling Club




2.4







16.0














Guildford (Woodville Golf Club) - 2.0 2.0 17.0 - - - - - 2.0 - - - - 12.0 - - - - - - - - - - - - - - -
Holsworthy Control Range - 1.0 5.4 14.0 0.6 - - - - 2.2 - - - - 25.8 - - - - - - - - - - - - - -
Lidcombe (Carnarvon Golf Club) - - 1.0 11.0 1.0 - - - - 1.0 - - - - 22.0 - - - - - - - - - - - - - - -
Liverpool-Scrivener St (Georges River) - - 6.0 13.0 - - - - - 3.0 - - - - 17.0 - - - - - - - - - - - - - - -
Lucas Heights (ANSTO)
0.6 5.8 16.0 1.2



1.6


1.6 47.2





0.4




0.3
0.2
Manley / Warringah (Allambie) - 0.5 2.5 14.5 0.5 - - - - 4.5 2.5 - - - 36.0 - - - - - - 1.5 -
- - - - - 0.5
Manley / Warringah (Belrose) - -
13.0 0.5 -
- - 4.0 2.0 - - - 43.0 - - - - - - 1.0 0.5 - - - - - - -
Marrickville Golf Club - 1.0 1.0 15.0 - - - - - 3.0 - - - - 23.0 - - - - - - - - - - - - - - 3.0
Milperra Bridge (Georges River) - - 3.0 12.0 - - - - - 2.0 - - - - 17.0 - - - - - - - - - - - - - - -
Mona Vale Golf Club - 0.4 1.4 17.6 0.4 - - - 0.2 5.4 0.6 0.2 - - 12.4 - - - - - 0.2 1.0 0.2 - 0.4 - - - - 1.0
Parramatta (Erts) - 0.5 0.5 14.0 - - - - - 2.5 - - - - 15.5 - - - - - - - - - 0.5 - - - - -
Parramatta North (Masons Drive) - 0.6 1.2 17.4 0.8 - - - - 4.1 1.0 - - - 14.4 - - - - - - 0.4 - - - - - - - -
Peakhurst Golf Club - - 3.0 17.0 1.0 - - - - 3.0 1.0 - - - 16.0 - - - - - - - - - - - - - - 3.0
Riverview Observatory - 1.0 3.0 12.6 »» 0.6 - - - 3.8 0.8 - - - 54.8 - - - - - 0.2 2.4 0.2 - - - - - - 0.8
Rose Bay (Royal Sydney Golf Club)
1.2 2.4 8.8 0.8

1.0
2.8 1.4


21.2





1.8

0.2



2.8
Sans Souci (Public School) - - 2.0 18.0 - - - - - 4.0 - - - - 9.0 - - - - - - 2.0 - - - - - - - -
St Ives (Richmond Avenue)
0.8 9.0 0.8




4.4 1.4








0.4 1.4







Strathfield Golf Club - 2.0 2.0 17.0 1.0 - 1.0 - - 5.0 1.0 1.0 - - 59.0 - - - 1.0 - 1.0 - - - 1.0 1.0 - - - -
Sydney (Observatory Hill) - 0.8 3.2 7.4 0.6 - - - - 2.4 0.8 - - - 21.0 - - - - - - 1.8 0.2 - - - - - - 4.0
Sydney Airport AMO - 0.4 1.2 12.4 0.8 - - - - 2.8 - - - - 11.4 - - - - - - 1.8 0.2 - - - - - - 0.8
Sydney Olympic Park (Sydney Olympic Pk A - 1.2 1.8 18.2 0.6 -
- - 2.8 0.4 - - 0.2 44.6 - - - - - - - - - - - - - - -
Terrey Hills AWS - 0.6 5.2 16.8 0.8 - - - - 4.2 1.8 - - - 42.8 - - 0.2 - - - 3.0 - - 0.2 - - - - -
Turramurra (Kissing Point Road)
0.6 5.8 14.6 1.4 0.2


4.4 1.0


68.6





3.6






-
Metropolitan (West) (67)123456789101112131415161718192021222324252627282930
Abbotsbury (Fairfield City Farm) - 1.0 7.0 14.0 1.0 - - - - 3.0 - - - 10.0 14.0 - - - - - - - - - - - - - - -
Badgerys Creek AWS - - 4.0 16.4 0.2 - - - - 3.0 - - - - 16.8 - - - - - 0.2 - 0.2 - - - - 0.2 - 0.8
Baulkham Hills (Swimming Pool ) - - 2.0 15.5 1.0 - - - - 5.0 0.5 - - - 12.5 - - - - - - - - - - - - - - 1.5
Baulkham Hills Eucalyptus Ct - - 2.0 15.5 0.5 - - - - 5.0 1.5 - - - 8.0 - - - - - - - - - - - - - - 3.5
Berowra (Goodwyn Road)


23.4




5.8



39.8





2.6







Blacktown (Dog Pound) - 0.5 2.0 13.0 - - - - - 3.0 - - - - 4.5 - - - - - - - - - - - - - - 3.0
Box Hill (Hynds Road) - - 1.0 13.0 - - - - - 4.0 1.0 - - - 9.0 - - - - - - - - - - - - - - -
Castle Hill (Kathleen Ave)
0.5 2.6 15.6 0.9 0.1


5.0 0.6


25.0





0.7






0.5
Glenorie (Old Northern Rd)

8.0 14.2 1.0



5.0



7.0





1.4







Greystanes (Cumberland Golf Club) - 1.0 1.0 14.5 0.5 - - - - 2.0 - - - - 8.0 - - 1.0

- - - - - - - - - -
Hawkesbury River (Sackville Downstream) - - 3.5 8.0 0.5 - - - - 3.5 0.5 - - - 9.5 0.5 0.5 - - -
- - - - - - - - -
Horsley Park Equestrian Centre AWS - 2.4 5.6 16.4 - - - - - 3.4 0.4 - - 7.0 22.2 - - - - - - 0.2 - - - - - - - 1.2
Kelso Ck (Kelso Creek U/S Levee (Georges - 0.5 8.0 14.5 0.5 - - - - 3.0 0.5 - - 0.5 20.0 - - - - - - - - - - - - 0.5 - -
Kings Langley (NSW Soccer Federation) - - 1.0 15.0 0.5 - - - - 4.0 1.0 - - - 7.5 - - - - - - 0.5 - - - - - - - 0.5
Kings Langley (Solander Rd) - - 1.0 15.2 0.4
- - - 4.6 1.2 - - - 7.4 - - - - - - - - - - - - 0.2 - 1.4
Liverpool (Michael Wenden Centre) - 6.0 4.0 14.5 - - - - - 3.8 0.6 - - - 11.4 - - - - - - - - - - - - - - -
Lower Portland (Hawkesbury River) - - - - - - - - - 1.4 -
- - 10.6 - - - - - - 0.4 0.2 - - - - - - -
Maroota (Tobruk) - 1.2 5.4 16.8 - - - - - 5.4 0.2 - - - 14.8 - - - - - 0.4 1.6 - - - - - - - -
Merrylands (Welsford Street)
0.6 1.2 22.2




4.2



12.8














Merrylands West (Finlayson Creek) - 1.5 2.0 22.0 - - - - - 3.5 1.0 - - - 12.5 - - - - - - - - - - - - - - -
North Parramatta (Burnside Homes) - - 1.5 15.0 0.5 - - - - 3.5 - - - - 12.5 0.5 - - - - - - - - - - - 1.0 - -
North Rocks (Muirfield Golf Club) - - 1.5 18.5 0.5 - - - - 6.0 1.5 - - - 18.5 - - - - - - 0.5 - - - - - - - 0.5
Northmead Bowling Club - 0.5 1.5 14.0 0.5 - - - - 3.5 0.5 - - - 10.5 - - - - - - - - - - - - - - 0.5
Parramatta (Baulkham Hills West (Sierra - - 1.0 14.0 0.5 - - - - 4.5 1.0 - - - 7.5 - - - - - - - - - - - - - - 2.0
Penrith Lakes AWS - - 2.6 11.8
- - - - 1.0 0.2 - - - 10.6 0.2 -
- - - -
- -
- - - -
Prospect Reservoir - 1.0 2.6 14.6 0.2 - - - - 3.2 0.4 - - - 5.8 - - - - - - - - - - - - - - 2.1
Richmond RAAF
-
12.2 0.8 - - - - 4.0
- - - 7.6 - - - - - - - - - - - - - - 0.4
Seven Hills (Radio FM 103.2)

















2.0






-
-
Seven Hills (Collins St)

1.8 18.0




4.0



6.4













3.8
St Clair (Juba Close) - 1.0 1.0 10.0 - - - - - 1.0 1.0 - - - 6.0 1.0 - - - - - - - - - - - - - -
Toongabbie Bowling Club - - 1.0 14.5 - - - - - 3.0 1.0 - - - 6.5 0.5 - - - - - - - - - - - - - 2.0
Toongabbie Ck (Redbank Road (Toongabbee - - 1.0 16.0 - - - - - 3.0 1.0 - - - 13.5 - - - - - - - - - - - - - - -
West Pennant Hills (Cumberland S F Alert - - 3.0 14.0 1.0 - - - - 4.5 0.5 - - - 28.5 0.5 - - - - - 1.0 - - - - - - - 1.5
Willmot (Resolution Ave) - - 2.0 10.0 - - - - - 2.0
-

4.0 - - - - - - - - - - - -
- -
Windsor SWC (Hawkesbury River) -

10.0 1.0 - - - - 4.0 - - - - 8.0 - - - - - - - - - - - - - - -
Illawarra (68)123456789101112131415161718192021222324252627282930
Camden Airport AWS
0.2 1.0 13.8 3.2 - - - - 2.0 - - - - 26.6 0.2 - - - - - - - - - - - 0.4 - 0.6
Camden Valley Golf Resort - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Campbelltown (Kentlyn (Georges River Roa - - 2.0 15.0 1.0 - - - - 1.0 - - - - 41.0 - - - - - - - - - - - - - - 2.0
Campbelltown (Mount Annan) - 0.6 1.2 11.8 3.2 - - - - 1.2 0.2 - - - 35.2 - - - - - - 0.2 0.4 - - - - 0.2 - 1.0
Rossmore (South Creek) - - 3.0 15.0 - - - - - 3.0 - - - 1.0 14.0 - - - - - - - - - - - - 1.0 - -

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 11 am on Friday 1 October 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