Wet end to Autumn

  • Above average rainfall for coastal areas.
  • Above average maximum temperatures.
  • Warm night time temperatures on the coast and cool nights in the west.

Rainfall

Sydney Observatory Hill recorded 168.4 mm in May which is above the historical average1 of 100.6 mm. This has been the wettest May since 2003 (348.6 mm) and the wettest month since February 2010 (239.4 mm). The majority of the rainfall fell during four events; the first of which was on the 18th-19th, due to onshore SE flow combined with very much above average sea surface temperatures, and an upper level low pressure trough which contributed to thunderstorms and persistent moderate to heavy falls throughout the 18th (mostly constricted to coastal areas). The second event was on the 22nd-23rd of the month and was due to SE onshore flow and an upper level trough. More rain followed on the 26th-27th caused by a low pressure system off the NSW coast combined with SE winds, which resulted in moderate rainfall throughout the day. The final event on the 30th-31st was a result of a low pressure system which moved across from the far south coast of NSW to off the coast of central NSW affecting Sydney's weather. Very much above average sea surface temperatures along the NSW coast have contributed to the high humidity and rainfall for all of these events. The wettest day of 83.0 mm was recorded at Cronulla South Bowling Club on the 19th of the month. This was also the wettest part of Sydney overall recording 302.8 mm for May.

Sydney's storage levels have dropped to 56.3% following a dry April. Although many locations received above average falls, most of the rainfall events were constricted to the coast. 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

Sydney Observatory Hill recorded an average mean temperature (average of maximum and minimum temperatures) of 16.4°C which is 0.2°C above the historical average1 of 16.2°C. During the first half of the month temperatures were above average with mostly fine conditions due to the passage of several high pressure systems. The first cool change came through on the 12th with mostly below average temperatures recorded from the 17th till the end of the month. Cloudy conditions associated with four rainfall events in the second half of the month contributed to the cooler than average maximum temperatures. Coastal areas recorded mostly above average minimum temperatures due to the higher humidity, which is a result of higher than average sea surface temperatures. The onshore flow was mostly restricted to coastal areas with western parts of Sydney recording mainly below average minimum temperatures.

Maximum temperature

Sydney Observatory Hill recorded an average maximum temperature of 20.6°C which is 0.3°C above the historical average1 of 20.3°C. This is the warmest May since 2009 (20.7°C). Warm conditions were experienced across the Sydney basin with Campbelltown recording the warmest daily and monthly average maximum temperature of 27.2 °C and 21.2 °C respectively.

Minimum temperature

Sydney Observatory Hill recorded an average minimum temperature of 12.1°C which is 0.1°C above the historical average1 of 12.0°C. The warmest minimum temperatures were recorded at Sydney Observatory Hill with the warmest night of 16.2 °C also recorded at Sydney Observatory Hill on the 4th on the month.

Wind

Prevailing winds in coastal Sydney during the afternoon (3pm) were between E and S for 48% of the time during May which is very close to the normal frequency from this direction of 49% (observations taken from Sydney Airport).

Other phenomena

There was a total of 2 thunderstorms recorded in Sydney which is above the historical average1 for May. Sydney Observatory Hill recorded an average of 5.7 hourswhich is slightly below the historical average1 of 5.9 hours per day.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in May 2010
Hottest day 27.2 °C at Campbelltown (Mount Annan) on the 2nd
27.2 °C at Campbelltown (Mount Annan) on the 11th
27.2 °C at Sydney Airport AMO on the 11th
Warmest days on average 21.2 °C at Campbelltown (Mount Annan)
21.2 °C at Liverpool (Michael Wenden Centre)
Coolest days on average 18.9 °C at Springwood Bowling Club
Coldest day 13.7 °C at Terrey Hills AWS on the 18th
Coldest night -0.7 °C at Camden Airport AWS on the 13th
-0.7 °C at Richmond RAAF on the 13th
Coolest nights on average 6.5 °C at Camden Airport AWS
Warmest nights on average 12.1 °C at Sydney (Observatory Hill)
Warmest night 16.2 °C at Sydney (Observatory Hill) on the 4th
Wettest overall

302.8 mm at Cronulla South Bowling Club

Wettest day 83.0 mm at Cronulla South Bowling Club on the 19th
Highest wind gust 72 km/h at Sydney Airport AMO on the 26th
72 km/h at Sydney Airport AMO on the 31st




Summary statistics for May 2010
Maximum temperatures
for May
(°C)
Minimum temperatures
for May
(°C)
Rainfall
for May
(millimetres)
Mean for
May
2010
Diff
from
average
Highest for
May
2010
Mean for
May
2010
Diff
from
average
Lowest for
May
2010
Total for
May
2010
Average
for
May
Rank of
May
2010
Fraction of
May
average
Badgerys Creek AWS 20.7   25.5 11th 7.3   2.0 13th 61.4
Bankstown Airport AWS 20.7 +0.3 26.2 11th 9.3 -0.3 4.3 13th 95.6 70.9 average 135%
Camden Airport AWS 20.9 +0.4 26.7 11th 6.5 -0.7 -0.7 13th 97.8 59.9 high 163%
Campbelltown (Mount Annan) 21.2   27.2 11th 7.4   1.0 13th 68.6
Canterbury Racecourse AWS 20.6   26.4 11th 9.4   4.9 13th 110.6
Holsworthy Control Range 20.9   26.6 11th 8.6   3.6 6th 74.2
Horsley Park Equestrian Centre AWS 20.5   26.6 11th 9.3   3.6 13th 63.4
Liverpool (Michael Wenden Centre) 21.2   26.5 2nd 8.0   3.0 13th 91.0
Parramatta North (Masons Drive) 20.6 +0.1 26.5 11th 9.7 -0.3 5.2 13th 85.3 72.2 average 118%
Penrith Lakes AWS 21.0   26.9 11th 8.9   3.5 13th 50.0
Prospect Reservoir 20.6 +0.3 26.3 11th 9.6 -0.4 4.1 13th 72.1 72.1 average 100%
Richmond RAAF 20.5   26.6 11th 6.8   -0.7 13th 37.4
Riverview Observatory 20.4 +0.8 26.5 4th 10.4 +0.5 6.8 13th 126.0 106.7 high 118%
Springwood Bowling Club 18.9   24.3 11th 9.6   5.0 13th 70.8 73.9 average 96%
Sydney (Observatory Hill) 20.6 +1.2 27.0 11th 12.1 +0.6 9.0 13th 168.4 121.1 high 139%
Sydney Airport AMO 20.4 +0.4 27.2 11th 11.9 +1.0 7.9 13th 165.2 100.8 high 164%
Sydney Olympic Park (Sydney Olympic Pk A 20.8   27.1 11th 11.3   8.0 13th 144.4
Terrey Hills AWS 19.1   25.1 11th 10.7   6.1 13th

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 1.5 - - - - 3.0 0.5 - - - - - - - - - - - 1.0 - - 3.0 - 0.2 9.0 - 29.0 1.5 0.5 1.0 -
Central Tablelands (South) (63)12345678910111213141516171819202122232425262728293031
Sackville Ferry (Hawkesbury River) 0.2 0.2 - 0.2 - 0.4 - 0.2 0.2 - 0.4 - - - 0.2 0.2 - 0.4 0.8 - 0.2 - - - 6.6 2.6 18.8 0.4 4.0 0.6 3.4
Springwood Bowling Club - - - - 2.8 0.4 - - - - - - - - - - - - - - - 2.8 - - 2.4 12.8 38.0 2.0 2.8 2.6 4.2
Valley Heights (Sun Valley Rd) 0.4 - - - 2.4 0.6
-
- - - - - -
- 0.2 0.6 - - 2.8
- 2.6 13.0 45.8 3.0
5.0 5.0
Metropolitan (East) (66)12345678910111213141516171819202122232425262728293031
Abbotsford (Blackwall Point Rd)
















10.5 32.0
»» 5.2 »» 9.0 »» 11.6 42.0 2.0 3.0 3.0
Auburn (Rosnay Golf Club) - - - - - 6.0 - - - - - - - - - - - 22.0 9.0 - - 1.0 - - 1.0 7.0 35.0 - 3.0 1.0 13.0
Audley (Royal National Park) - - - - - 1.0 - - - - - - - - - - 4.0 15.0 26.0 1.0 - 10.0 2.0 1.0 3.0 13.0 52.0 4.0 3.0 2.0 12.0
Avalon Beach (Avalon (Palmgrove Rd)) 4.0



5.0








»» 6.4 19.0 33.2 4.8
»» 42.0 0.4 6.2 12.2 53.0 2.0 8.0
14.4
Bankstown Airport AWS -
-
- 1.0 - -
- - - - - - - 0.2 20.6 7.4
- 0.4 - - 2.4 9.0 35.2 2.4 3.2
13.8
Belrose (Evelyn Place) 2.5 0.2


4.6









0.6 18.0 31.0

5.8 5.2 0.8 2.4 4.6 30.4 1.4 6.2 3.4 7.0
Campbelltown (Ingleburn (Long Point)) - - - - - 1.0 - - - - - - - - - - - - 1.0 - - 2.0 - - 7.0 6.0 44.0 3.0 5.0 7.0 16.0
Canterbury Racecourse AWS
- - - - 4.2 -

- - - - - - - 3.8 22.2 30.0 0.2
4.0 1.4 0.2 1.0 10.8 27.6
2.8 2.4
Castle Cove (Rosebridge Ave) 1.4



3.0










6.0 43.0

7.0 7.0 1.0 1.2 8.0 34.0 3.0 3.0 5.0 2.0
Chatswood Bowling Club 1.0 - - - - 1.0 - - - - - - - - - - - 13.0 35.0 1.0 - 6.0 5.0 3.0 1.0 8.0 34.0 1.0 3.0 3.0 12.0
Collaroy (Long Reef Golf Club)














3.8 10.8 36.8 40.6 6.2
33.2 20.8
2.0 12.4 35.2 1.6
3.4 8.8
Concord Golf Club 0.2



3.4










16.0 22.6

4.6 1.4 1.2 1.4 12.8 33.8 5.8 3.6 2.6
Cronulla South Bowling Club















6.6 77.0 83.0 3.4
45.0 »» 13.4 2.6 7.4 45.4 2.0 2.4 »» 14.6
Guildford (Woodville Golf Club) - - - - - 5.0 - - - - - - - - - - - 23.0 6.0 1.0 - - - - 1.0 11.0 37.0 1.0 2.0 2.0 11.0
Holsworthy Control Range - - -
- 0.2 - - - - - 0.2 - - - - - 4.0 1.4 - - 1.0 - - 3.8 7.0 39.8 1.4 2.4 3.2 9.8
Lidcombe (Carnarvon Golf Club) - - - - - 2.0 - - - - - - - - - - 1.0 17.0 10.0 - - - - - 1.0 8.0 25.0 1.0 2.0 1.0 5.0
Liverpool-Scrivener St (Georges River) - - - - - - - - - - - - - - - - - 8.0 2.0 - - - - - 3.0 11.0 38.0 3.0 2.0 1.0 8.0
Lucas Heights (ANSTO)




0.6









0.2 6.4 4.0




4.4 14.2 44.0 5.0
4.0 17.4
Manley / Warringah (Allambie) 2.0 - - - - 3.0 - - - - -
- - - - 2.5 38.5 31.5 1.0 - 9.5 10.0 1.0 1.5 6.0 38.0 1.5 5.0 3.0 7.0
Manley / Warringah (Belrose)
-

-
- -
- -
- - - - 0.5 10.5 25.5 - - 4.0 4.0 0.5
4.5
1.0 1.5 3.0
Marrickville Golf Club 1.0 - - - - 4.0 - - - - - - - - - - 10.0 24.0 43.0 1.0 - 9.0 2.0 1.0 1.0 13.0 28.0 1.0 3.0 2.0 6.0
Mona Vale Golf Club 0.6 - - - - 5.6 - - - - - - - - - 1.8 7.6 21.6 42.2 4.2 - 25.8 21.6 1.4 4.8 3.8 38.2 1.0 6.4 4.0 9.4
Parramatta (Erts) - - - - - 2.0 - - - - - - - - - - - 12.5 5.5 - - - - - 1.0 4.0 26.5 0.5 2.0 1.0 6.5
Parramatta North (Masons Drive) 0.2 - - - 0.2 3.4 - - - - - - - - - - - 14.0 7.6 - - 0.2 - - 2.2 4.4 34.6 6.0 3.2 1.3 8.0
Peakhurst Golf Club - - - - - 1.0 - - - - - - - - - - 3.0 24.0 25.0 - - 8.0 1.0 - 2.0 8.0 49.0 1.0 2.0 1.0 10.0
Randwick Bowling Club 9.2

1.6










1.0 9.6 28.4 73.0 6.4
19.4 35.0 9.6 »» 30.0 43.3
4.6

Riverview Observatory 1.0 »» »» 0.4 - 2.4 - - - - 0.2 - - - - - - 20.0 27.2 »» 1.0 4.8 5.0 2.6 0.8 6.0 41.2 0.8 3.8 2.4 6.4
Rose Bay (Royal Sydney Golf Club) 6.0
1.6

1.2








4.2 4.6 28.2 69.2 3.2 0.2 19.2 44.6 6.2 0.6 9.8 32.6 3.2 4.8 3.2 4.8
Sans Souci (Public School) - - - - - 1.0 - - - - - - - - - - 2.0 56.0 46.0 2.0 - 23.0 2.0 2.0 2.0 8.0 44.0 1.0 2.0 3.0 13.0
St Ives (Richmond Avenue) 1.8










»» »» »» »» 3.4 11.0 23.4 »» »» 2.2 2.4 0.2 3.3 5.6 33.0 5.0 6.0 3.6 9.6
Strathfield Golf Club 2.0 - 1.0 - - 4.0 - 1.0 1.0 1.0 1.0 - 1.0 - - - - 25.0 27.0 - - 3.0 1.0 - 1.0 11.0 29.0 1.0 3.0 2.0 12.0
Sydney (Observatory Hill) 1.8 - 0.2 - - 2.0 - - - - - - - - - - 1.0 13.8 47.8 1.0 - 17.2 14.2 5.6 0.8 9.0 33.6 1.6 3.0 3.0 12.8
Sydney Airport AMO 1.0 0.2 - - - 3.8 - - - - - - - - - - 12.0 22.0 47.0 1.6 - 14.4 14.4 1.4 0.8 9.6 24.8 - 2.8 2.6 6.8
Sydney Olympic Park (Sydney Olympic Pk A 1.0 - - - - 4.4 - - - - - - - - - - 0.2 28.2 26.6 - - 3.8 - 0.2 1.6 13.0 44.0 0.2 3.8 2.0 15.4
Terrey Hills AWS



















- 3.8 3.2 0.8 4.0 4.4 30.4 1.4 6.6 3.2 6.6
Turramurra (Kissing Point Road) 1.2 0.2


2.8










10.2 25.0 0.4
9.2 0.6 1.6 2.8 4.0 41.0 2.4 6.0 3.6 7.6
Metropolitan (West) (67)12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield City Farm) - - - - - 2.0 - - - - - - - - - - - 2.0 - - - - - - 2.0 10.0 28.0 1.0 2.0 1.0 8.0
Badgerys Creek AWS


- 0.4

-
- - - - - -
- -
0.4 - 0.2 - - 3.6
42.0 1.0
6.2 7.6
Baulkham Hills (Swimming Pool ) 0.5 - - - - 2.0 - - - - - - - - - - - 7.5 5.5 - - - 0.5 - 1.0 6.0 38.0 - 4.0 1.5 7.5
Baulkham Hills Eucalyptus Ct - 0.5 - - - 3.0 - - - - - - - - - - - 10.5 4.5 - - - - - 1.5 3.5 29.5 2.0 2.5 1.0 10.5
Berowra (Goodwyn Road) 1.8














0.6
27.8

0.2 0.4
5.2 4.4 41.6 2.2 7.2
8.0
Blacktown (Dog Pound) - - - - - 5.0 - - - - - - - - - - 0.5 8.0 1.5 - - - - - 1.0 8.5 34.0 1.0 3.0 2.5 7.0
Box Hill (Hynds Road) - - - - - - - - - - 1.0 - - - - - - 3.0 1.0 1.0 - - - - 3.0 7.0 24.0 1.0 2.0 2.0 8.0
Castle Hill (Kathleen Ave) 0.7


0.3 2.8










6.0 6.0
»» 0.8
0.2 1.3 8.6 42.2 0.1 4.0 2.0 9.0
Glenorie (Old Northern Rd)
















3.0 2.4




5.0 3.0 30.0 4.0 6.0 2.6 8.4
Greystanes (Cumberland Golf Club) - - - - - 5.5 - - - - - - - - - - - 12.5 1.0 - - - - - 0.5 5.0 36.5 2.0 2.5 1.5 9.5
Hawkesbury River (Sackville Downstream) - - - - - 0.5 - 0.5 - - 0.5
- - - - - - 1.0 - - - - 0.5 0.5 0.5 17.5 1.0 0.5 - -
Horsley Park Equestrian Centre AWS
- 0.2 - - 2.0 - -
- - - - - - - - 3.4
- - 0.2 - - 1.0 10.8 32.2 0.8 2.4 1.4 9.0
Kelso Ck (Kelso Creek U/S Levee (Georges - - - - 0.5 0.5 - - - - - - - - - - - 15.5 6.0 0.5 - - - - 2.5 11.5 46.0 4.5 5.0 1.5 13.0
Kings Langley (NSW Soccer Federation) - - - - - 2.0 - - - - - - - - - - - 7.0 3.0 - 0.5 - - - 1.5 4.0 27.0 - 3.0 1.5 8.5
Kings Langley (Solander Rd) - 0.4 - - - 5.4 - - - - 0.2 - - - - - - 8.6 3.2 - - - - - 2.0 4.6 27.2 1.8 2.6 1.4 8.8
Liverpool (Michael Wenden Centre) - - - - - 1.4 - - - - 0.2 - - - - - - 3.4 1.0 - - - - - 3.2 13.8 46.6 8.6 2.6 2.0 8.2
Lower Portland (Hawkesbury River) 0.6 0.2 0.2 - 0.2 0.6 - - - - - 0.2 - - - - - 0.4 0.8 - - - - -


- 1.0 1.0 3.0
Maroota (Tobruk) 2.6 0.2 - 0.2 - 7.0 - - - - - - - - - - - 1.6 1.2 0.2 - 0.2 - 0.4 9.8 4.6 33.2 0.4 5.0 1.0 6.0
Merrylands (Welsford Street)
















17.6





1.8 6.6 36.4
3.8
10.2
Merrylands West (Finlayson Creek) - - - - - 9.0 - - - - - - - - - - - 23.0 3.0 - - - - - 1.5 13.5 52.0 3.5 3.5 3.0 14.5
North Parramatta (Burnside Homes) - - - - 0.5 3.0 - - - - - - - - - - - 12.5 8.0 - 0.5 - - - 1.5 3.5 33.0 5.5 3.0 1.0 7.0
North Rocks (Muirfield Golf Club) - - 0.5 - - 2.5 - - - - - - - - - - - 10.0 7.0 0.5 - 0.5 - - 1.5 3.0 36.5 0.5 4.5 1.5 8.0
Northmead Bowling Club - 0.5 - - - 3.0 0.5 - - - - - - - - - - 11.5 6.0 - - - - - 2.0 3.5 27.5 3.5 3.0 1.0 9.0
Parramatta (Baulkham Hills West (Sierra - - - - - 5.0 - - - - - - - - - - - 9.5 2.5 - - - - - 2.0 5.5 27.0 2.0 2.5 1.5 9.0
Penrith Lakes AWS - - 0.2 - 0.4 1.2 - - - - - - - - - - - 0.4 0.4 - - 0.6 0.2 - 2.2
34.8
3.2 0.6 5.8
Prospect Reservoir - - - - - 3.8 - - - - - - - - - - - 9.0 2.7 - - - - - 1.3 6.0 33.7 2.2 3.2 1.4 8.8
Richmond RAAF - - 0.2 - - 0.2 - - - - - - - - - - -

2.4 - 1.4 - - 2.0 5.4 16.2 1.8 2.4 0.6 4.8
Seven Hills (Radio FM 103.2) - - - - - 4.0 - - - - - - - - - - - 8.5 1.0 - - - - - 2.0 8.5 24.0 - 3.0 1.0 8.0
Seven Hills (Collins St)




7.8










7.6 3.4




2.2 4.6 28.0 1.8 3.4 1.6 5.0
St Clair (Juba Close) - - - - - 1.0 - - - - - - - - - - - - - - - - - - 1.0 13.0 30.0 1.0 2.0 2.0 5.0
Toongabbie Bowling Club - - - - - 5.5 0.5 - - - - - - - - - - 10.5 2.0 - - - - - 2.0 6.0 25.5 0.5 3.0 2.0 7.5
Toongabbie Ck (Redbank Road (Toongabbee 0.5 - - - - 3.5 - - - - - - - - - - - 14.0 6.0 - - - - - 1.5 4.0 32.5 0.5 2.5 1.5 10.0
West Pennant Hills (Cumberland S F Alert - - 0.5 - - 1.0 - - - - - - - - - - - 7.5 6.0 - - 0.5 - 0.5 1.0 7.0 40.5 - 3.5 1.5 12.0
Willmot (Resolution Ave) - - - - - - - - - - - - - - - - - 2.0 2.0 1.0 - - - - 1.0 7.0 21.0 - 2.0 1.0 4.0
Windsor SWC (Hawkesbury River) - - - - - - - - - - - - - - - - - 1.0 5.0 - - - - - 3.0 9.0 16.0 2.0 4.0 1.0 5.0
Illawarra (68)12345678910111213141516171819202122232425262728293031
Camden Airport AWS - 0.2 - - 0.4 2.4 - - - - 0.2 - - - - - - - 0.8 - - - - - 5.2 1.2 40.8 6.6 3.4 25.0 11.6
Camden Valley Golf Resort - - - - - - - - - - - - - - - - - 1.0 1.0 - - - - - 4.0 2.0 24.0 2.0 1.0 - 1.0
Campbelltown (Kentlyn (Georges River Roa - - - - - - - - - - - - - - - - - - - - - 1.0 - - 3.0 - - 4.0 1.0 1.0 1.0
Campbelltown (Mount Annan) - - - - 0.2 0.4 - - - - - - - - - - - 1.6 2.6 - -
- - 5.4 5.0 29.4 6.4 3.2 4.0 10.4
Rossmore (South Creek) - - - - - 1.0 - - - - - - - - - - - - - 1.0 - - - - 4.0 10.0 43.0 1.0 3.0 7.0 11.0

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 10 am on Tuesday 1 June 2010. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

A note about deciles: Deciles are used to give an element (in this case rainfall or temperature) a ranking. Deciles are calculated by arranging the totals in ascending order (from lowest to highest) then splitting them into 10 equal groups (thus the groups are called deciles). The first group would be in decile range one, the second group in decile range two, etc up to the highest annual totals (highest 10 per cent) being in decile range 10.

1Averages: Averages are based on the period 1961 to 1990 which is a convention of the World Meteorological Organisation

Normals are long-term averages 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 for temperature and less than 30 years of record for rainfall, as they cannot then be calculated reliably.

 

Further information

Media
(03) 9669 4057
Enquiries