Sydney in December 2012: A warm, dry end to the year.

  • Warmest and driest December since 2005
  • Below average sunshine

Rainfall

Sydney Observatory Hill recorded 45.2 mm of rain during December, below the historical average of 77.9 mm. This was the driest December for Sydney since 25.2 mm was recorded in 2005, with rainfall below average across the city. The rain fell over 11 rain days, normal for Sydney, but only two reached at least 5 mm, half the historical average and the fewest wet days since 2005.

Most of the rain fell over the Christmas period, associated with a coastal trough and widespread thunderstorm activity. Sydney Observatory Hill recorded a 48-hour total of 30.8 mm to 9am on the 26th, with up to 41 mm at Avalon.

Temperature

Sydney Observatory Hill recorded an average maximum temperature of 26 °C during December, 0.8 °C above the historical average, with warmer than average temperatures recorded across the city. This is the warmest December in Sydney since 2005, and significantly warmer than December 2011 (23.1 °C). Five days reached at least 30 °C during the month (average 3 days), the most since 5 days in December 2008, with no days dropping below 20 °C.

Nights were also warm during December, with Sydney Observatory Hill recording an average minimum temperature of 18.6 °C, 1.1 °C above the historical average. Only two nights were cooler than 15 °C (average 4 nights), with the coldest night reaching 14 °C on the 6th, while ten nights recorded at least 20 °C (average 4 nights).

The mean daily temperature at Sydney Observatory Hill was consequently 22.3 °C, 0.9 °C above the historical average, with temperatures above average throughout the city.

Other phenomena

The prevailing wind direction at Sydney Airport was easterly, with 55% of 3pm winds between E-NNE, while 39% of 3pm winds were ESE-S, normal for December. There were thirteen strong wind days at the airport, with the maximum wind gust reaching 87 km/h on the 9th.

Sydney Airport recorded an average of 6.9 hours of bright sunshine during December, well below the historical average but sunnier than December 2011 (6.7 hours). There was one thunderstorm reported at the airport, with four storms reported throughout the Metropolitan region

Further information

Media
(03) 9669 4057
Enquiries

Extremes in December 2012
Hottest day 39.7 °C at Badgerys Creek AWS on the 24th
Warmest days on average 29.5 °C at Penrith Lakes AWS
Coolest days on average 25.8 °C at Terrey Hills AWS
Coldest day 16.4 °C at Springwood (Valley Heights) on the 10th
Coldest night 7.0 °C at Camden Airport AWS on the 6th
Coolest nights on average 15.4 °C at Campbelltown (Mount Annan)
15.4 °C at Springwood (Valley Heights)
Warmest nights on average 18.7 °C at Sydney Airport AMO
Warmest night 23.5 °C at Sydney Airport AMO on the 1st
Warmest on average overall 23.3 °C at Penrith Lakes AWS
Coolest on average overall 21.1 °C at Terrey Hills AWS
Wettest overall 64.0 mm at Avalon (Wollstonecraft Ave)
Wettest day 30.6 mm at Turramurra (Kissing Point Road) on the 26th
Highest wind gust 91 km/h at Port Botany (Molineux Point AWS) on the 9th
91 km/h at Port Botany (Molineux Point AWS) on the 16th

Summary statistics for December 2012
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2012
Diff
from
average
Highest for
December
2012
Mean for
December
2012
Diff
from
average
Lowest for
December
2012
Total for
December
2012
Average
for
December
Rank of
December
2012
Fraction of
December
average
Badgerys Creek AWS 28.9   39.7 24th 16.1   8.2 6th 36.6
Bankstown Airport AWS 28.2 +1.0 37.8 1st 17.2 +0.6 10.2 6th 34.2 67.4 average 51%
Camden Airport AWS 29.1 +0.7 39.4 24th 15.8 +0.7 7.0 6th 38.6 54.9 average 70%
Campbelltown (Mount Annan) 27.8   38.2 24th 15.4   7.1 6th 33.4
Canterbury Racecourse AWS 26.9   36.0 1st 17.0   9.6 6th 38.0
Holsworthy Aerodrome AWS 27.6   37.4 1st 16.5   8.3 6th 27.4
Holsworthy Control Range 27.7   37.3 1st 15.9   8.2 6th 25.0
Horsley Park Equestrian Centre AWS 28.5   38.6 24th 16.5   9.8 6th 39.0
Parramatta North (Masons Drive) 28.0 +0.6 38.0 24th 16.6 +0.4 9.6 6th 38.6 70.9 low 54%
Penrith Lakes AWS 29.5   38.8 24th 17.1   10.5 6th 28.0
Prospect Reservoir 28.4 +1.0 37.8 1st 16.9 +0.6 10.5 6th 43.8 75.3 average 58%
Richmond RAAF 29.4   38.8 24th 16.4   8.1 6th 48.2
Springwood (Valley Heights) 27.0   37.0 24th 15.4   10.0 6th 41.2 101.7 low 41%
Sydney (Observatory Hill) 26.0 +0.8 33.0 20th 18.6 +1.1 14.0 6th 45.2 77.6 average 58%
Sydney Airport AMO 26.9 +1.2 36.2 1st 18.7 +1.2 14.4 6th 26.0 73.7 low 35%
Terrey Hills AWS 25.8   34.0 28th 16.5   11.6 6th 48.4

Daily rainfall
Hunter (61)12345678910111213141516171819202122232425262728293031
Webbs Ck-Wisemans Ferry (Hawkesbury Rive 3.2 0.2 6.4 - - - - - - 1.6 1.4 10.0 - - - - 0.2 - - - - - - - 10.8 36.6 - -
Central Tablelands (South) (63)12345678910111213141516171819202122232425262728293031
Springwood (Valley Heights) 1.8 0.2 6.4 »» 0.4 - - - - 4.8 0.6 1.0 - - - - 0.6 - 0.4 - - - - 0.4 8.0 13.0 2.0 - - 1.6 -
Metropolitan (East) (66)12345678910111213141516171819202122232425262728293031
Abbotsford (Blackwall Point Rd) 3.0
5.0







4.0



2.0







»» »» »» 36.0

Auburn (Rosnay Golf Club) 1.0 - 2.0 - - - - - - - - 1.0 - - - - - - - - - - - - 5.0 22.0 - - - - -
Audley (Royal National Park) - - 1.0 - - - - - - - - 4.0 - - - - - - - - - - - - 7.0 12.0 - - - - -
Avalon (Wollstonecraft Ave) 1.0 - 3.0 1.0 - - - - - 6.0 4.0 7.0 1.0 - - - - - - - - - - - 11.0 30.0 - - - - -
Avalon Beach (Avalon (Palmgrove Rd)) 1.4
3.2





5.2 5.8 7.2




0.2












Bankstown Airport AWS 0.8 - 1.6 0.2 - - - - - - - 1.2 1.0 - - - - - - - - - - - 6.0 23.4 - - - - -
Belrose (Evelyn Place) 1.0 0.6 1.6 - 1.0 - - - - 3.6 2.8 4.6 - - - 0.6 0.4 - - - - - - - 7.0 23.2 - - - 1.0
Campbelltown (Ingleburn (Long Point)) 1.0 - - - - - - - - - - - - - - - - - - - - - - - 10.0 14.0 - - - - -
Canterbury Racecourse AWS 1.0 0.2 2.8 0.4 - - - - - - - 1.6 - - - - - - - - - - - - 10.0 21.8 - - - - 0.2
Castle Cove (Rosebridge Ave) 0.5
3.0 1.5




5.5 2.0 2.0











6.5 28.0


0.5
Chatswood Bowling Club - - 3.0 2.0 - - - - - 3.0 1.0 2.0 - - - - 1.0 - - - - - - - 8.0 29.0 - - - - -
Collaroy (Long Reef Golf Club)


2.4




2.4 2.0 2.2











6.2 22.2


1.0
Concord Golf Club 2.2
2.2 2.6



















9.2 21.6




Cronulla South Bowling Club 2.0
2.0





0.2
7.0











»» 20.0



2.0
Guildford (Woodville Golf Club) 1.0 - 2.0 - - - - - - - - - - - - - - - - - - - - - 7.0 22.0 - - - - -
Holsworthy Aerodrome AWS 1.0 0.2 0.6 - - - - - - - - 0.4 - - - - - - - - 0.2 - - - 9.4 15.4 - - - 0.2 -
Holsworthy Control Range 0.8 0.2 0.6 - - - - - - - - 0.6 - - - - - - - - 0.2 0.2 - - 6.2 16.0 - - - 0.2 -
Lidcombe (Carnarvon Golf Club) 1.0 - 3.0 1.0 - - - - - - - 1.0 - - - - - - - - - - - - 6.0 23.0 - - - - -
Liverpool-Scrivener St (Georges River) - - 1.0 1.0 - - - - - - - - - - - - - - - - - - - - 4.0 21.0 - - - - -
Lucas Heights (ANSTO)

0.8





0.4
6.4


















Macquarie Park (Willandra Village)
0.6 4.0





4.2 1.2 1.4 0.2


1.6 0.2





»» 39.2


0.6
Marrickville Golf Club 1.0 1.0 2.0 1.0 - - - - - - - 2.0 - - - - - - - - - - - - 10.0 21.0 - - - - -
Mona Vale Golf Club 2.8 1.0 2.6 0.8 - - - - - 2.4 1.6 4.2 0.2 - - 0.4 - - - - - - - - 7.4 20.6 - - - 0.6 -
Parramatta (Erts) 2.0 - 1.0 - - - - - - 1.0 - 0.5 0.5 - - - 0.5 - - - - - - - 4.0 23.0 - - - - -
Parramatta North (Masons Drive) 2.4 0.2 3.0 0.6 - - - - - 3.2 - 1.4 - - - - 2.0 - - - - - - - 4.8 21.0 - - - - -
Peakhurst Golf Club 3.0 - 2.0 - - - - - - - - 1.0 - - - - - - - - - - - - 9.0 21.0 - - - - -
Randwick Bowling Club 1.8 0.2 2.8 4.4




0.8 0.2 2.8


0.2 0.4



0.4

8.2 22.4


0.6
Riverview Observatory 1.0 0.4 4.2 0.6 - - - »» - »» »» 4.0 - - - -



- - - - - - - - -

Rose Bay (Royal Sydney Golf Club)
0.2 1.2





0.6
4.0











13.4

0.2


Sans Souci (Public School) 5.0 - 1.0 1.0 - - - - - - - 3.0 - - - - - - - - - - - - 6.0 14.0 - - - - -
St Ives (Richmond Avenue) 1.4 0.8 2.0 0.8




4.6 4.0 2.0 0.8


1.4






5.6 25.1


1.4
Strathfield Golf Club



- 1.0 - - 1.0 1.0 - 2.0 1.0 - - 1.0 1.0 - - 1.0 - - - - 6.0 24.0 - - - - -
Sydney (Observatory Hill) 1.6 - 1.4 5.0 - - - - - 1.6 0.6 3.4 - - - - 0.4 0.2 - - - - - - 9.2 21.6 - - - - 0.2
Sydney Airport AMO 0.8 - 1.0 0.6 - - - - - - - 2.0 0.2 - - - - - - - - - 0.2 - 4.2 17.0 - - - - -
Terrey Hills AWS 1.8


- - - - - 6.2 6.8 3.2 0.4 - - - - - - - - - - - 8.6 20.0 - - - 1.4 -
Turramurra (Kissing Point Road) 2.2 0.6 3.0 1.4




7.0 2.2 3.2 0.8

0.6 0.4



0.4

6.8 30.6


1.0 -
Metropolitan (West) (67)12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield City Farm)



- - - - - 2.0 - - 1.0 - - - - - - - - - - - 7.0 24.0 - - - - -
Badgerys Creek AWS 0.6 0.2 2.2 0.2 - - - - - 1.6 - 1.8 - - - - - - - - - 0.2 - 1.0 9.8 18.8 - 0.2 - - -
Baulkham Hills (Swimming Pool ) 1.0 - 3.0 - 0.5 11.0 - - - 3.0 1.0 - - - - - 2.5 - - - - - - - 6.5 25.5 - - - - -
Baulkham Hills Eucalyptus Ct 1.5 - 3.0 0.5 2.0 - - - - 2.5 0.5 1.0 - - - - 2.0 - - - - - - - 3.5 21.5 - - - - -
Berowra (Goodwyn Road) - - 4.0 1.0 - - - - - 1.8 1.4 3.6 - - - - 0.8 - 0.4 - - 0.4 - - 15.0 23.4 - - - 0.2 -
Blacktown (Dog Pound) 1.0 0.5 1.5 1.0 - - - - - 3.0 - 0.5 0.5 - - - - - 1.0 - - - - - 5.5 28.5 - - - - -
Box Hill (Hynds Road) 2.0 - 1.0 - - - -
- 2.0 - 1.0 - - - - - - - - - - - - 11.0 19.0 - - - - -
Castle Hill (Kathleen Ave) - - - - - - - - - - - - - - - 0.2 0.4 - 0.4 - - - - - 7.4 24.6




Glenorie (Old Northern Rd)

2.6





1.0 1.0












8.0 29.6




Greystanes (Cumberland Golf Club) 1.0 - 1.5 0.5 - - - - - 1.0 - 1.5 - - - - - - - - - - - - 5.5 20.0 - - - - -
Horsley Park Equestrian Centre AWS 1.4 - 1.0 0.2 0.2 - - - - 2.4 - 1.6 0.2 - - - - - 0.4 - - - 0.2 0.2 6.0 25.0 0.2 - - - -
Kelso Ck (Kelso Creek U/S Levee (Georges 1.0 - 1.0 - - - - - - - - - - - - - - - - 1.0 - - - - 4.5 16.0 - - - - -
Kings Langley (NSW Soccer Federation) 1.5 - 2.5 - - - - - - 3.0 0.5 3.0 - - - - 2.0 - - - - - - - 7.5 23.0 - - - - -
Liverpool (Michael Wenden Centre) 14.7 »» »» »» »» »» »» »» »» »» »» 1.4
- - - - - - -










Lower Portland (Hawkesbury River) 5.8 - 1.8 - - - - - - 3.2 0.2 - 0.2 - - - - - - - - - - - 13.0 19.4 0.2 - - - -
Maroota (Tobruk) 5.4 0.4 4.8 0.2 - - - - - 3.6 1.8 9.2 - - - 0.2 - - - - - - - - 9.0 28.6 - - - - -
Merrylands West (Finlayson Creek) 1.0 - 2.0 1.0 - - - - - 1.0 - 1.0 - - - - - - - - - - - - 6.0 20.0 - - - - -
North Parramatta (Burnside Homes) 1.5 0.5 2.5 1.5 - - - - - 2.5 - 1.0 0.5 - - - 3.0 - - - - - - - 4.5 19.5 - - - - -
North Rocks (Muirfield Golf Club) 0.5 - 2.5 1.0 - - - - - 2.5 0.5 1.0 - - - - 0.5 - - - - - - - 3.0 24.5 - - - - -
Northmead Bowling Club 2.0 - 2.5 0.5 - 0.5 0.5 - 1.0 2.5 - 1.0 - 0.5 - - 2.5 - - - - - - - 3.5 18.5 - - - - -
Penrith Lakes AWS 1.2 0.2 2.6 0.2 - - - - - 1.6 - 0.4 0.2 - - - - - - - - - - - 9.6 11.4 - - - 0.4 0.2
Prospect Reservoir 1.6 0.2 2.3 0.4 - - - - - 2.0 3.0 2.0 - - - - - - 0.4 - - 0.4 0.1 0.2 8.2 23.0 - - - - -
Richmond RAAF 3.4 0.4 2.2 - 0.2 - - - - 2.0 - 1.6 - - - - 0.2 - - - - 0.2 - - 19.0 19.0 - - - - -
Sackville 2.0 0.2 0.6 0.2 - - - - - 2.8 1.6 4.8 - - - - - - - - - - - - 19.6 32.6 0.2 - - - -
Seven Hills (Radio FM 103.2) 4.5 - 1.5 1.0 - - - - - 2.0 - - 0.5 - - - 0.5 - 0.5 - - - - - 3.5 18.0 - - - - -
Seven Hills (Collins St) 2.6
1.8





»» 4.0











»» 6.6 19.4




South Creek (Elizabeth Drive)

0.5





1.0
0.5










0.5 2.5 13.0




St Clair (Juba Close) 1.0 - - - - - - - - 1.0 - 2.0 - - - - - - - - - - - - 4.0 16.0 - - - - -
Toongabbie Bowling Club 2.5 - 1.5 0.5 - - - - - 2.5 - 0.5 0.5 - - - 1.0 - - - - - - - 3.0 20.5 - - - - -
Toongabbie Ck (Redbank Road (Toongabbee 3.0 - 2.0 0.5 0.5 - - - - 1.5 - 1.5 - - - - 1.0 - - - - - - - 5.5 27.5 0.5 - - - -
West Pennant Hills (Cumberland S F Alert 0.5 0.5 3.5 1.0 - - - - - 3.0 1.0 3.0 - - - - 1.5 - - - - - - - 6.5 22.0 - - - - -
Willmot (Resolution Ave) 2.0 - 2.0 - - - - - - 3.0 - - - - - - - - - - - - - - 19.0 19.0 - - - - -
Windsor SWC (Hawkesbury River) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Illawarra (68)12345678910111213141516171819202122232425262728293031
Camden Airport AWS 0.6 - 1.8 0.2 - - - - - 0.6 0.2 - - - - 0.4 - - - - - - - 0.2 19.4 15.0 - - - 0.2 -
Campbelltown (Kentlyn (Georges River Roa - - 1.0 - - - - - - - - 1.0 - - - - - - - - - - - - 14.0 12.0 - - - - -
Campbelltown (Mount Annan) 0.6 - 1.2 -
- - - - - - 0.2 - - - - - - -

0.2 - - 21.0 10.2 -
-
-
Rossmore (South Creek) 1.0 - 1.0 - - - - - - 1.0 - - - - - - - - - - - - - - 8.0 21.0 - - - - -

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 9 am on Wednesday 2 January 2013. 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