Monday, 3 August 2009 - Monthly Climate Summary for Sydney - Greater Sydney - Product code IDCKGC25L0

Sydney - Greater Sydney in July 2009
Warm, sunny July for Sydney

  • Above average sunshine hours
  • Above average minimum temperatures for coastal Sydney
  • Below average rainfall in the west

An archive of previous monthly summaries for Sydney - Greater Sydney is also available, as are summaries for other states and many other climate summaries and diagnostics.

Rainfall

Close to average rainfall was recorded across the Sydney Metropolitan area during July. Observatory Hill recorded at total of 53 mm, which is close to the historical July average of 56.3 mm. There were 9 rain days during July, which is very close to the average of 8.5 rain days. The wettest suburbs were in coastal Sydney where Randwick recorded 75.2 mm for the month. Western Sydney experienced a relatively dry July, with Richmond RAAF recording a total of 16.6 mm of rainfall, which is well below the historical average of 31.7 mm.

The majority of the month's rainfall fell in three main events. The first occured between the 8th and 11th July, when a high pressure system in the Tasman Sea produced moist onshore flows bringing coastal rain. The second event occured around the 17th July, again caused by a high pressure system in the Tasman Sea. The third event occured around the 27th July, triggered by a low pressure trough off the east coast of NSW, which brought rainfall to the western Sydney area.

The catchment recieved only minor rainfall during July, causing storage levels to drop slightly from 61.4% at the end of June, to 60.7% at the end of July. Recent rainfall and current levels in Sydney's water catchments can be found on the Sydney Catchment Authority web site http://www.sca.nsw.gov.au/dams/rainfall.html.

Temperature

The Sydney Metropolitan area experienced slightly above average maximum temperature conditions over July. Observatory Hill recorded an above average maximum temperature of 18.3°C, which is 2.0°C above the historical July average. Camden Airport recorded it's highest ever July temperature on the 22nd, reaching 25.4°C, beating the previous record set in 1975 by 0.1°C. July weather was dominated by high pressure systems in the Tasman Sea and the passage of a number of fronts.

Mild nights were experienced in coastal Sydney, while close to average minimum temperatures were recorded in Sydney's west. The average minimum temperature at Sydney Observatory Hill was 9.2°C, or 1.2°C above the historical average. Average minimum temperatures in western Sydney were close to the historical average, with Camden Airport recording a July average minimum temperature of 3.2°C, which is only 0.3°C above the historical average. Warm onshore flows throughout the month led to warmer than average nights in coastal Sydney.

There was a considerable variation in temperatures over the Sydney region during July, with extremes ranging from a high of 26.7°C at Penrith Lakes on the 22nd to a low of −1.8°C at Camden Airport on the 25th.

Some sites had their highest July temperature on record.

Wind

Westerly winds prevailed in coastal Sydney on 83% of mornings and 36% of afternoons. The strongest wind gust was 72km/h at Bankstown Airport on the 3rd, coinciding with a low pressure trough off the coast of NSW on this day.

Other phenomena

Sydney Airport recorded above average sunshine hours, averaging 7.3 hours per day, well above the historical average of 6.6 hours. Cloudiness during July was also below average, with Sydney Airport recording an average of 2.9 oktas, compared to the long-term average of 3.2 oktas. No fog or frost events were recorded at Observatory Hill during July. Strong wind was recorded in Sydney on the 3rd, however no thunderstorms were reported over land during July.

Further information

Claire Krause
Climate Officer
NSW Climate Services Centre
Bureau of Meteorology
Phone (02) 9296 1555
Email climate.nsw@bom.gov.au

Extremes

Hottest day
Highest temperature
26.7°C at Penrith Lakes AWS on the 22nd
Warmest days on average
Highest mean daily maximum temperature
18.4°C at Sydney Olympic Park (Sydney Olympic Pk A
Coolest days on average
Lowest mean daily maximum temperature
16.4°C at Terrey Hills AWS
Coldest day
Lowest daily maximum temperature
11.2°C at Penrith Lakes AWS on the 26th
Coldest night
Lowest temperature
−1.8°C at Camden Airport AWS on the 25th
Coolest nights on average
Lowest mean daily minimum temperature
3.2°C at Camden Airport AWS
Warmest nights on average
Highest mean daily minimum temperature
9.2°C at Sydney (Observatory Hill)
Warmest night
Highest daily minimum temperature
15.7°C at Sydney (Observatory Hill) on the 1st
Wettest overall
Highest total rainfall
75.2 mm at Randwick Bowling Club
Wettest day
Highest daily rainfall
29.0 mm at Sans Souci (Public School) on the 8th
Highest wind gust
72 km/h at Bankstown Airport AWS on the 3rd

Records

Record highest July temperature
Highest temperature
in July 2009 (°C)
Previous highest
for July
Years of
record
Average for
July
Camden Airport AWS 25.4 on the 22nd 25.3 on the 31st in 1975 33 17.2



Summaries

This table is very wide and may not fit if printed.

Summary statistics for July 2009
Maximum temperatures
for July
(°C)
Minimum temperatures
for July
(°C)
Rainfall
for July
(millimetres)
Mean for
July
2009
Diff
from
average
Highest for
July
2009
Mean for
July
2009
Diff
from
average
Lowest for
July
2009
Total for
July
2009
Average
for
July
Rank of
July
2009
Fraction of
July
average
Bankstown Airport AWS 17.8 +0.6 24.6 22nd 5.1 0.0 1.6 6th 38.8 44.6 average 87%
Camden Airport AWS 17.5 +0.3 25.4 22nd 3.2 +0.3 −1.8 25th 18.4 39.0 average 47%
Canterbury Racecourse AWS 17.9   24.7 22nd 5.3   1.8 15th 49.4
Parramatta North 18.1 +0.7 24.6 22nd 6.9 +0.7 3.6 25th 37.0 45.4 average 81%
Penrith Lakes AWS 18.3   26.7 22nd 5.4   1.5 6th 15.4
Prospect Reservoir 17.5 +0.7 24.8 22nd 6.4 +0.3 1.9 6th 27.6 57.2 average 48%
Richmond RAAF 17.9   25.0 22nd 4.1   −1.1 6th 16.6
Sydney 18.3 +2.0 24.7 22nd 9.2 +1.2 6.2 6th 53.0 97.3 average 54%
Sydney Airport AMO 18.1 +1.1 25.5 22nd 8.7 +1.6 5.8 6th 53.0 68.9 average 77%
Terrey Hills AWS 16.4   22.8 22nd 7.8   3.1 6th 63.8

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)12345678910111213141516171819202122232425262728293031
Webbs Ck-Wisemans Ferry (Hawkesbury Rive - - - - - - - 0.2 1.4 1.8 2.0 - - - - - 1.6 - - 0.2 - - 2.2 - - 0.2 3.0 0.2 - - 0.2
Central Tablelands (South) (63)12345678910111213141516171819202122232425262728293031
Sackville Ferry (Hawkesbury River) - - - - - - - 0.8 2.6 2.0 1.2 - - - - 0.2 2.0 0.2 - 0.2 - - 3.6 0.4 0.2 - 9.4 - 0.2 0.2 -
Springwood Bowling Club - - - - - - - 2.0 1.8 1.4 0.2 - - - 0.2 0.2 1.4 - - - - - 2.2 - - - 4.0 - - - -
Valley Heights (Sun Valley Rd)

-
-
- 2.2 2.4 2.0 0.4 -

- 0.8 2.6 -
- - - 1.8 1.4

4.2 -
-
Metropolitan (East) (66)12345678910111213141516171819202122232425262728293031
Abbotsford (Blackwall Point Rd)





2.0 9.0 7.0 7.0 0.3




7.0




5.0


12.0



Auburn (Rosnay Golf Club) - - - - - - - 6.0 5.0 3.0 1.0 - - - - - 7.0 - - - - - 2.0 - - - 8.0 - - - -
Audley (Royal National Park) - - - - - - - 4.0 7.0 3.0 1.0 1.0 - - - - 8.0 - - - - - 2.0 - - - 6.0 - - - -
Avalon (Wollstonecraft Ave) - - - - - - 1.0 18.0 7.0 6.0 12.0 - - - - - 10.0 - - - - - 5.0 8.0 - - 6.0 - - - -
Bankstown Airport AWS - - - - - - - 8.0 11.0 2.8 - 0.2 0.2 - - - 6.8 - - - - - 1.6 0.4 - - 7.8 - - - -
Belrose (Evelyn Place)





0.2 19.0 6.0 13.0 1.6
0.2


10.6




2.2 0.4

12.0


-
Campbelltown (Ingleburn (Long Point)) - - - - - - - 4.0 7.0 3.0 2.0 - - - - 4.0 7.0 - - 1.0 - - 1.0 - - - 7.0 - - - -
Canterbury Racecourse AWS - - - - - - 0.6 14.6 9.6 4.6 0.6 0.2 0.2 - - - 6.4 - - - - - 3.4 0.6 - - 8.6 - - - -
Castle Cove (Rosebridge Ave)





0.5 24.0 3.0 21.0

1.0












12.0



Chatswood Bowling Club - - - - - - - 9.0 2.0 16.0 - - - - - - 6.0 - - - - - 2.0 - - - 13.0 - - - -
Collaroy (Long Reef Golf Club)





1.6 16.0 3.8 3.2





8.8








10.2



Concord Golf Club






8.2 7.8 7.2





7.6








15.8



Cronulla South Bowling Club





1.0 13.0 13.2 9.4 1.6 1.0


4.0 13.6




2.6 1.6






Guildford (Woodville Golf Club)
















1.0 - - - - 1.0 - - - 8.0 - - - -
Holsworthy Control Range - - - - - - - 0.4 3.0 2.0 1.0 - 0.2 0.2 - -
- - - - - 2.2 0.2 - - 5.0 - - - -
Lidcombe (Carnarvon Golf Club) - - - - - - - 9.0 6.0 2.0 1.0 - - - - - 8.0 - - - - - 3.0 - - - 8.0 - - - -
Liverpool-Scrivener St (Georges River) - - - - - - - 5.0 7.0 2.0 - - - - - - 6.0 - - - - - - - - - 6.0 - - - -
Lucas Heights (ANSTO)






4.8 9.0 3.4

0.2


8.2




1.4


5.6



Manley / Warringah (Allambie) - - - - - - - 20.5 8.5 15.5 1.5 - - -

8.5 - - - - - 1.5 2.0 - - 12.5 - - - -
Manley / Warringah (Belrose)

- - -

15.0 5.0 13.5 1.5 - - - -
9.0 -

- - 1.5 0.5 - - 10.5
-

Marrickville Golf Club - - - - - - 2.0 14.0 10.0 3.0 1.0 - - - - - 6.0 - - - - - 3.0 - - - 9.0 - - - -
Milperra Bridge (Georges River) - - - - - - - 4.0 8.0 2.0 - - - - - - 4.0 - - - - - - - - -



-
Mona Vale Golf Club - - - - - - 0.8 9.8 16.2 7.8 0.4 - 0.2 - - - 10.2 - - - - - 3.8 6.4 0.2 - 8.8 - - - -
North Turramurra (Dryden Rd)








9.8







-



3.6

12.6



Parramatta (Erts) - - - - - - - 3.0 4.0 5.0 - - - - - - 9.0 - - - - - 0.8 - - - 3.0 - - - -
Parramatta North (Masons Drive) - - - - - - - 6.8 1.8 6.0 1.0 0.2 - - - - 6.6 - - - - - 4.8 - - - 9.8 - - - -
Randwick Bowling Club





6.2 18.2 20.0
0.4



0.6 11.0




4.8 3.4

10.6



Riverview Observatory - - - - - »» 1.1 9.8 1.8 8.2 0.6 »» 0.4 - - - 6.6 - - - - - 3.2 0.3 0.2 - 10.6 0.2 - - -
Rose Bay (Royal Sydney Golf Club)





0.4 18.4 6.8 6.6 0.2
0.2

0.4 14.0 0.2



3.8 7.2 0.2
12.2



Sans Souci (Public School) - - - - - - - 29.0 7.0 7.0 - - - - - 1.0 9.0 - - - - - 2.0 - - - 7.0 - - - -
St Ives (Richmond Avenue)





0.6 14.0 5.6 8.8 0.4
0.6


10.0




4.6 1.2

10.2



Strathfield Golf Club - - - - - - - 11.0 6.0 7.0 - 1.0 - - - - 7.0 - - - - - 4.0 - - - 12.0 - - - -
Sydney (Observatory Hill) - - - - - - 0.6 13.8 6.2 8.8 - - 0.2 - - - 7.0 - - - - - 3.6 0.6 - - 12.2 - - - -
Sydney Airport AMO - - - - - - 2.6 17.2 9.0 4.4 0.2 0.2 0.2 - - 1.0 6.0 0.2 - - - - 2.6 0.4 - - 8.8 - - 0.2 -
Sydney Olympic Park (Sydney Olympic Pk A - - - - - - - 8.4 4.8 4.6 0.2 0.2 - - - - 9.0 - - - - - 3.4 - 0.2 - 9.2 0.2 - - -
Terrey Hills AWS - - - - - - - 16.0 6.2 10.8 0.4 - -
- - 10.8 - - - - - 3.4 3.2 - - 13.0 - - - -
Turramurra (Kissing Point Road)




0.5 7.8 2.6 10.4 1.2
0.2



9.0




3.4 0.6

11.8


-
West Pymble (Wyuna Road)




0.8
8.4 6.4 12.0





7.0







0.4 13.0



Metropolitan (West) (67)12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield City Farm) - - - - - - - 3.0 8.0 2.0 - - - - - - 6.0 - - - - - - - - - 6.0 - - - -
Badgerys Creek AWS - - - - - - - 1.2 5.6 1.8 - 0.2 - - - 0.2 4.0 - - 0.2 - - 1.6 - 0.2 - 5.2 - - - -
Baulkham Hills (Swimming Pool ) - - - - - - - 3.0 1.5 6.5 - - - - - - 5.5 - - - - - 2.0 - - - 10.5 - - - -
Baulkham Hills Eucalyptus Ct - - - - - - - 4.5 2.5 4.5 0.5 - - - - - 6.0 - - - - - 2.0 - - - 10.5 - - - -
Berowra (Goodwyn Road)







21.8 7.2 1.2 0.4



8.0




2.6


11.8



Blacktown (Dog Pound) - - - - - - 1.0 3.5 2.5 2.5 - - - - - - 6.0 - - - - - 1.5 - - - 7.5 - - - -
Box Hill (Hynds Road) - - - - - - - - 3.0 4.0 - - - - - - 4.0 - - - - - 1.0 - - - 9.0 - - - -
Castle Hill (Kathleen Ave)





0.1 4.2 2.2 8.0 0.6
0.3


6.6




2.0


11.6



Glenorie (Old Northern Rd)






4.0 8.0 4.0





6.4




3.0


13.0



Greystanes (Cumberland Golf Club) - - - - - - - 5.0 9.5 3.0 - - - - - - 5.5 - - - - - 1.0 - - - 8.0 - - - -
Hawkesbury River (Sackville Downstream) - - - - - - - 0.5 2.0 2.0 1.0 - - - -
2.0 - - - - - 3.5
- - 9.0 - 0.5 -
Horsley Park Equestrian Centre AWS - - - - - - - 2.8 5.6 1.0 0.2 - 0.2 - - - 6.0 - 0.2 - - - 0.8 - - 0.2 5.6 - - - -
Kelso Ck (Kelso Creek U/S Levee (Georges - - - - - - - 7.0 10.0 2.0 0.5 - - - - 0.5 6.0 - - - 0.5 - 2.0 0.5 - - 6.0 - - - -
Kings Langley (NSW Soccer Federation) - - - - - - - 5.0 1.5 4.5 - - - 0.5 - - 5.0 - - - - - 1.5 - 0.5 - 10.0 - - - -
Kings Langley (Solander Rd) - - - - - - - 4.4 2.2 3.2 0.4 - - - - - 5.4 - - - - - 2.0 - - - 9.4 - - - -
Liverpool (Michael Wenden Centre) - - - - - - - 2.2 6.2 3.6 0.2 0.2 - - - - 7.0 - - - - - 1.8 - - - 5.2 - - - -
Lower Portland (Hawkesbury River) - 0.2 - - - - - 0.6 1.4 1.2 0.8 - 0.2 - - - 2.0 - 0.2 - 0.2 - 2.2 - 0.2 - 7.4 - - - 0.2
Maroota (Tobruk) - - -



1.4 2.2 1.8 3.0 - - - - 0.2 1.8 - - - - - 3.0 0.2 0.2 - 5.6 - - - -
Merrylands (Welsford Street)






5.4 4.8 3.8





6.6








8.8



Merrylands West (Finlayson Creek) - - - - - - - 4.0 3.0 3.5 - - 0.5 - - - 5.5 - - - - - 1.0 - - - 8.0 - - - -
North Parramatta (Burnside Homes) - - - - - - - 7.0 1.5 5.5 0.5 - - - - - 6.0 - - - - - 3.0 - - - 8.5 - - - -
North Rocks (Muirfield Golf Club) - - - - - - - 6.5 2.5 7.0 - - - - - - 8.0 - - - - - 2.5 - - - 15.5 0.5 - - -
Northmead Bowling Club - - - - - - - 6.0 1.0 5.0 0.5 - - - - - 5.5 - - - - - 2.5 - - - 9.0 - - - -
Parramatta (Baulkham Hills West (Sierra - - - - - - - 4.5 2.5 4.0 - - - - - - 5.0 - - - - - 2.0 - - - 9.5 - - - -
Penrith Lakes AWS - - - - - 0.2 - 2.0 0.4 1.8 0.6 0.2 - - - 0.2 2.8 - 0.2 - - - 1.4 - 0.2 - 5.0 - 0.2 - 0.2
Prospect Reservoir - - - - - - - 4.4 4.6 2.7 0.3 0.1 - - - - 6.6 - - - - - 1.3 - - - 7.4 0.2 - - -
Richmond RAAF - - - - - - - - 2.2 1.0 0.4 - 0.2 - - - 2.6 - 0.2 - - - 1.4 0.6 - 0.2 7.8 - - - -
Seven Hills (Radio FM 103.2) - - - - - - - 3.0 1.5 3.0 - - - - - - 5.5 - - - - - 1.5 0.5 - - 7.5 - - - -
Seven Hills (Collins St)






5.0 1.5 5.6





6.4




3.9


9.5



St Clair (Juba Close) - - - - - - - 2.0 2.0 1.0 1.0 - - - - - 4.0 - - - - - - - - - 6.0 - - - -
Toongabbie Bowling Club 0.5 - - - - - - 4.5 1.0 5.0 - - - - - - 5.5 - - - - - 2.5 0.5 - - 8.0 - - - -
Toongabbie Ck (Redbank Road (Toongabbee - - - - - - - 6.0 1.0 5.0 0.5 - - - - - 6.5 - - - - - 3.0 - - - 9.0 - - - -
West Pennant Hills (Cumberland S F Alert - - - - - - - 4.0 3.0 8.5 0.5 - - - - - 7.5 - - - - - 2.5 - - - 13.0 - - - -
Willmot (Resolution Ave) - - - - - - - 1.0 - 2.0 - - - - - - 4.0 - - - - - - - - - 5.0 - - - -
Illawarra (68)12345678910111213141516171819202122232425262728293031
Camden Airport AWS - - - - - - - 1.8 3.2 2.2 0.4 - 0.2 0.2 - 0.6 3.4 - - - - - 1.2 - - - 5.2 - - - -
Camden Valley Golf Resort - - - - - - - 1.0 1.0 1.0 1.0 - - - - - 4.0 - - - - - 1.0 - - - 4.0 - - - -
Campbelltown (Kentlyn (Georges River Roa - - - - - - - 2.0 5.0 2.0 - - - 1.0 - - 6.0 - - 1.0 - - 2.0 - - - 5.0 - - - -
Campbelltown (Mount Annan) - - - - - - - 2.4 7.4 2.2 0.4 - - - - 3.4 4.8 - - - - - 1.6 0.2 - - 5.6 - - - -
Rossmore (South Creek) - - - - - - - 2.0 6.0 1.0 - - - - - - 5.0 - - - - - 1.0 - - - 5.0 - - - -

Notes

This statement has been prepared based on information available at 8 am on Monday 3 August 2009. 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

Claire Krause
Climate Officer
NSW Climate Services Centre
Bureau of Meteorology
Phone (02) 9296 1555
Email climate.nsw@bom.gov.au