Sydney in April 2012: Warm, wet April for Sydney

  • Above average rainfall.
  • Above average temperatures.
  • Warmest start to April in over 20 years.

Rainfall

Sydney Observatory Hill recorded 148.2 mm of rain during April, slightly above the historical average of 126.4 mm but drier than April 2011 (206.2 mm), although a temporary data loss on the 18th means true totals may have been higher. The rain fell over 9 rain days, below the April average of 13 days, of which three exceeded 10 mm. Around the Sydney region, most stations recorded above average rainfall, including the wettest April since 1990 at Bankstown and Glenorie.

Most of the rain fell between the 17th and 19th, as a coastal low pressure trough caused several days of persistent rain across the NSW coast. Sydney Observatory Hill recorded a 48 hour total of at least 104.8 mm to 9am on the 19th, the wettest such period in April since 165.4 mm fell on 11 April 1998. Daily falls reached 100 mm at Turramurra on the 19th and 95 mm at Glenorie on the 18th, with most of the city recording at least 100 mm during the event. Two-day totals reached 177.8 mm at Turramurra, the wettest April event since 30 April - 1 May 1988. The heavy rain was associated with flash flooding throughout the city, particularly in the coastal suburbs and the north shore, as well as minor spillage from the Warragamba Dam.

Temperature

Sydney Observatory Hill recorded an average maximum temperature of 23.6 °C during April, 1.2 °C above the historical average, with temperatures above average across the metropolitan region. Eleven days exceeded 25 °C during the month, double the historical average of 5 days, reaching 28.3 °C on the 7th, the warmest April day since 30.7 °C on 23 April 2010. Temperatures were particularly warm at the start of the month with seven consecutive days above 25 °C, only the third time on record for April and the first since 1977. The first nine days of April were thus the 6th warmest on record and warmest since 1986, before the temperature dropped to just 19.1 °C on the 10th.

Minimum temperatures were also above average throughout Sydney, with 15.5 °C at Observatory Hill, 0.8 °C above the historical average. Temperatures were warmest at the start of the month, with eight consecutive nights above 16 °C, reaching 20.1 °C on the 8th. This was followed by a cold snap with two consecutive nights below 11 °C on the 10th and 11th, the coldest period this early in April since 12-13 April 1994. There were four nights below 11 °C during the month, the most since 2006, although no nights dropped below 10 °C. The average temperature at Observatory Hill was consequently 19.5 °C, 1 °C above average.

Wind

The wind direction during April was variable, with 33% of 3pm winds at Sydney Airport SSE-SSW but 50% of 3pm winds N-E, with a lower proportion of E-SE winds than normal for April. There were six strong wind days reported at the airport, above the historical average of 4 days and the most since 2007. The strongest wind gusts reached 72 km/hr on the 9th and 10th, with the strongest gust anywhere in the metropolitan region reaching 78 km/hr at Port Botany on the 25th.

Other phenomena

Sydney Airport recorded an average of 7.1 hours of bright sunshine during April, close to the historical average of 6.9 hours. Three thunderstorms were reported at the airport, the most since 2007, with four storms anywhere in the Metropolitan region, and reports of hail on the 8th. Two fog days were reported at the Airport, on the 20th and 21st, the most in April since 2007, with fog covering much of the city on the morning of the 20th.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in April 2012
Hottest day 29.7 °C at Camden Airport AWS on the 3rd
Warmest days on average 24.2 °C at Penrith Lakes AWS
Coolest days on average 22.1 °C at Terrey Hills AWS
Coldest day 16.5 °C at Terrey Hills AWS on the 10th
Coldest night 5.8 °C at Badgerys Creek AWS on the 25th
5.8 °C at Camden Airport AWS on the 30th
Coolest nights on average 11.3 °C at Camden Airport AWS
Warmest nights on average 15.5 °C at Sydney (Observatory Hill)
15.5 °C at Sydney Airport AMO
Warmest night 20.1 °C at Sydney (Observatory Hill) on the 8th
Warmest on average overall 19.6 °C at Sydney Airport AMO
Coolest on average overall 17.5 °C at Camden Airport AWS
Wettest overall 234.8 mm at Turramurra (Kissing Point Road)
Wettest day 100.0 mm at Turramurra (Kissing Point Road) on the 19th
Highest wind gust 78 km/h at Port Botany (Molineux Point AWS) on the 25th

Summary statistics for April 2012
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2012
Diff
from
average
Highest for
April
2012
Mean for
April
2012
Diff
from
average
Lowest for
April
2012
Total for
April
2012
Average
for
April
Rank of
April
2012
Fraction of
April
average
Badgerys Creek AWS 23.6   28.7 3rd 12.0   5.8 25th 129.4
Bankstown Airport AWS 23.9 +0.3 29.2 3rd 13.1 +0.4 7.8 25th 163.0 85.0 high 192%
Camden Airport AWS 23.6 -0.2 29.7 3rd 11.3 +0.3 5.8 30th 142.6 66.9 high 213%
Campbelltown (Mount Annan) 23.6   28.4 3rd 11.6   6.4 25th 144.8
Canterbury Racecourse AWS 23.5   28.7 3rd 13.0   7.9 30th 149.2
Holsworthy Control Range 23.4   28.5 3rd 12.2   6.8 25th 134.2
Horsley Park Equestrian Centre AWS 23.4   28.7 3rd 12.9   8.1 9th 169.0
Parramatta North (Masons Drive) 23.5 -0.3 29.0 3rd 13.1 +0.3 8.0 30th 176.4 89.8 high 196%
Penrith Lakes AWS 24.2   29.5 3rd 13.6   9.5 13th 93.6
Prospect Reservoir 23.7 +0.1 29.3 3rd 13.2 +0.2 7.0 25th 157.5 74.8 high 211%
Richmond RAAF 24.1   29.6 7th 12.7   7.7 29th 131.2
Riverview Observatory 23.3 +0.6 27.3 9th 13.4 +0.5 8.2 11th 184.4 108.9 high 169%
Springwood (Valley Heights) 22.4   28.1 7th 12.8   7.3 25th 138.8 88.1 high 158%
Sydney (Observatory Hill) 23.6 +1.2 28.3 7th 15.5 +0.8 10.1 10th 148.2 126.4 average 117%
Sydney Airport AMO 23.6 +0.7 28.6 3rd 15.5 +1.3 9.8 10th 112.6 106.2 average 106%
Terrey Hills AWS 22.1   26.8 3rd 14.0   8.4 10th 210.8

Daily rainfall
Hunter (61)123456789101112131415161718192021222324252627282930
Webbs Ck-Wisemans Ferry (Hawkesbury Rive - - - - - - - - 1.6 0.2 - - - - - - 0.5 36.0 40.0 5.0 - - 0.5 4.0 - - - - - -
Central Tablelands (South) (63)123456789101112131415161718192021222324252627282930
Springwood (Valley Heights) - 3.2 0.2 - - - - - 6.4 - - - - - - - - 35.0 86.8 3.0 - - 2.0 1.8 0.4 - - - - -
Metropolitan (East) (66)123456789101112131415161718192021222324252627282930
Abbotsford (Blackwall Point Rd)
1.5





10.4
82.0 1.6





86.0










Auburn (Rosnay Golf Club) - 2.0 - - - - - - 14.0 - - - - - - - 3.0 56.0 71.0 - - - 2.0 1.0 - - - - - -
Audley (Royal National Park) - 1.0 1.0 - - - - - - - - 7.0 - - - - 14.0 24.0 60.0 3.0 - - 1.0 1.0 6.0 - - - - -
Avalon (Wollstonecraft Ave) - - - - - - - - 4.0 - - 5.0 1.0 - - - 49.0 65.0 91.0 1.0 - - 1.0 5.0 - - - - - -
Avalon Beach (Avalon (Palmgrove Rd))
1.0




4.0


7.6



68.6 70.4



2.0





1.0
Bankstown Airport AWS - 2.6 - - - - - - 9.4 - - 2.4 0.2 - - - 3.2 56.6 77.4 6.2 - - 0.8 2.4 1.8 - - - - -
Belrose (Evelyn Place)
0.8





7.4 0.2
2.4



8.6 72.8 71.6 0.4

1.0 3.6 1.2



-
Campbelltown (Ingleburn (Long Point)) - 5.0 - - - - - - - - - 2.0 - - - - 1.0 60.0 87.0 1.0 - - 2.0 3.0 5.0 - - - - -
Canterbury Racecourse AWS - 2.6 - - - - - - 9.4 - - 1.4 - - - - 5.6 48.6 77.6 0.2 - - 0.8 3.0 - - - - - -
Castle Cove (Rosebridge Ave)
1.0





25.0

1.5



8.0 69.0 82.0 2.0

1.0 4.0





Chatswood Bowling Club - - - - - - - - 15.0 - - 4.0 - - - - 7.0 70.0 70.0 - - - 1.0 3.0 4.0 - - - - -
Collaroy (Long Reef Golf Club)
1.2





13.2

5.8



5.2 66.4 60.0 7.4

1.6 2.6




1.2
Concord Golf Club
2.0





12.6

1.4



9.2 89.6 68.8 1.4

1.4 2.6





Cronulla South Bowling Club
5.0





8.4

6.2



3.0 32.0 62.0 5.4

0.4






Guildford (Woodville Golf Club) - 3.0 - - - - - - 16.0 - - - 1.0 - - - 3.0 52.0 77.0 - - - 1.0 2.0 - - - - - -
Holsworthy Control Range - 7.6 0.2 - - - - - - - - 4.2 - - - - 0.2 45.2 69.2 0.2 0.2 - 1.0 1.8 4.4 - - - - -
Lidcombe (Carnarvon Golf Club) - 1.0 - - - - - - 20.0 - - - - - - - 1.0 48.0 66.0 2.0 - - 1.0 2.0 - - - - - -
Lucas Heights (ANSTO)
2.4








4.6



2.0 26.8 71.4 0.8

0.4 1.4





Macquarie Park (Willandra Village)
1.2





23.8

3.8



11.6 66.2 85.4 0.4 0.2
0.8 2.6 6.0




Manley / Warringah (Allambie) - - 0.5 - - - - - 17.0 - - 3.0 - - - - 11.0 60.5 28.0 2.0 - - 1.0 3.5 0.5 - - - - -
Marrickville Golf Club - 2.0 - - - - - - 7.0 - - 2.0 - - - - 11.0 41.0 94.0 2.0 - - 2.0 2.0 - - - - - -
Milperra Bridge (Georges River) - 3.0 - - - - - - 9.0 - - 1.0 - - - - 2.0 52.0 71.0 4.0 - - 1.0 2.0 - - - - - -
Mona Vale Golf Club 0.4 0.6 0.2 - - 0.2 - - 6.4 - - 1.8 0.2 0.4 - - 18.4 73.4 86.8 3.8 0.4 0.4 1.6 4.0 2.2 - - - - 0.6
Parramatta (Erts) - 0.5 - - 0.5 - - - 13.5 - - - - - - - 1.0 45.0 81.0 - - - 0.5 1.5 - - - - - -
Parramatta North (Masons Drive) - 0.8 - - - - - - 12.4 - - - - - - - 2.6 70.0 86.0 0.4 - - 1.6 2.2 0.4 - - - - -
Peakhurst Golf Club - 5.0 - - - - - - 9.0 - - 3.0 - - - - 8.0 26.0 63.0 1.0 - - 1.0 2.0 2.0 - - - - -
Randwick Bowling Club - 1.6





6.4

6.8



22.6 34.6 90.6 4.8

0.6 4.0 1.8




Riverview Observatory - 1.0 0.2 - - - - »» »» 6.2 - 5.4 0.2 - - - 16.8 83.2 60.4 0.6 0.2 0.2 1.6 2.2 6.2 - - - - -
Rose Bay (Royal Sydney Golf Club)
0.8





11.2

6.2



5.2 53.0 84.2 4.0
0.2 0.8 4.4 4.0




Sans Souci (Public School) - 12.0 - - - - - - 10.0 - - 3.0 - - - - 8.0 19.0 81.0 3.0 - - 2.0 1.0 1.0 - - - - -
St Ives (Richmond Avenue)
1.0





7.0






8.6 69.0 82.4 0.8

1.8
4.0




Strathfield Golf Club - 2.0 - - - - - - 14.0 1.0 - - 1.0 - - - 3.0 73.0 79.0 - - 1.0 1.0 2.0 1.0 - - - - -
Sydney (Observatory Hill) - 0.6 - - - - - - 6.4 - - 7.2 - - - - 23.6 48.8 56.0 0.8 - - - 1.6 3.2 - - - - -
Sydney Airport AMO - 1.0 - - - - - - 4.6 - - 3.8 - - - - 11.4 29.0 57.6 2.2 0.2 »» 0.2 2.6 - - - - - -
Terrey Hills AWS - 0.8 0.2 - - - - - 4.6 - - 2.0 - - - - 39.2 70.0 88.2 0.4 - 0.2 1.4 3.6 - - - - - 0.2
Turramurra (Kissing Point Road)
0.8





38.0

2.6



6.0 77.8 100 4.0

1.2 3.4 1.0



-
Metropolitan (West) (67)123456789101112131415161718192021222324252627282930
Abbotsbury (Fairfield City Farm) - 16.0 - - - - - - 12.0 - - 4.0 - - - 1.0 - 26.0 37.0 1.0 - - 1.0 2.0 - - - - - -
Badgerys Creek AWS - 6.0 0.2 - - - - - - 0.6 0.2 - 0.2 - - - - 31.8 82.4 0.6 - 1.2 1.6 4.2 0.4 - - - - -
Baulkham Hills (Swimming Pool ) - 0.5 - 1.5 - - - - 34.5 - - - - - - - 1.0

- - - 2.0 2.5 3.0 - - - - -
Baulkham Hills Eucalyptus Ct - 1.5 - -

























Berowra (Goodwyn Road)







10.2

1.0




62.2 62.4


1.8






Blacktown (Dog Pound) - 2.0 1.0 - - - - - 14.0 - - 0.5 - - - - 1.5 48.5 45.5 - - - 1.5 2.0 0.5 - - - - -
Box Hill (Hynds Road) - 8.0 - - - - - - 4.0 - - - - - - - - 88.0 69.0 1.0 - 1.0 2.0 3.0 5.0 - - - - -
Castle Hill (Kathleen Ave)
1.2





23.4






3.8 82.2 36.2 0.5

1.5 3.4 4.5




Glenorie (Old Northern Rd)







7.4 1.4






95.0 68.0 2.0

3.0 3.6




2.3
Greystanes (Cumberland Golf Club) - 2.5 1.0 - - - - - 12.0 - - 0.5 - - - - 2.0 43.5 39.5 7.0 - - 1.5 1.5 - - - - - -
Horsley Park Equestrian Centre AWS - 8.6 - - - - - - 21.0 - - 3.4 0.2 - - - - 37.4 94.6 0.2 - - 0.8 2.6 0.2 - - - - -
Kelso Ck (Kelso Creek U/S Levee (Georges - 7.0 - - - - - - 3.0 - - 2.5 - - - - 1.5 33.5 58.0 6.5 - - 1.0 2.0 1.0 - - - - -
Kings Langley (NSW Soccer Federation) - 3.0 2.0 - - - - - 31.0 - - - - - - - 0.5 77.0 28.0 0.5 - - 2.0 2.0 - - - - - -
Kings Langley (Solander Rd) - 2.6 - - - - - -





















Liverpool (Michael Wenden Centre) - »» »» 5.4 - - - - 1.0 - - 8.6 - - - »» 0.9 »» 81.6 - - -
2.2 1.6 - - - »» 0.2
Lower Portland (Hawkesbury River) - 0.6 - - - - - - 9.0 - - 0.2 - 0.2 - - - 37.6 7.6 0.8 0.4 - 1.8 3.4 0.2 0.2 - -
-
Maroota (Tobruk) - 0.6 0.2 - - 0.2 - - 4.4 - - 0.4 0.4 - - - 0.6 56.4 39.4 4.6 - 0.4 3.4 4.0 0.2 - - - - -
Merrylands (Welsford Street)

















183










Merrylands West (Finlayson Creek)


- - - - - 13.5 0.5 - - 0.5 - - - 1.5 35.5 84.5 2.5 - - 1.5 1.5 - - - - - -
North Parramatta (Burnside Homes) - 1.0 0.5 - - - - - 11.5 - - - - - - - 1.5 67.0 26.5 - - - 1.5 1.5 - 0.5 - - - -
North Rocks (Muirfield Golf Club) - 1.5 - - - - - - 26.5 - - - - - - - -

- - - 1.5 2.0 3.5 - - - - -
Northmead Bowling Club - 1.0 - - 0.5 - - - 11.0 0.5 - - - - - - 1.5 64.5 62.0 2.5 - - 1.5 1.5 - - - - - -
Parramatta (Baulkham Hills West (Sierra - 1.5 0.5 0.5 - - - - 13.5 - - - - - - - 0.5 71.5 41.5 1.0 - - 1.5 2.5 - - - - - -
Penrith Lakes AWS - 3.0 - - - - - - 4.2 0.2 - 0.2 - - - - - 34.2 43.8 2.0 0.2 0.4 2.0 2.6 0.6 - - - 0.2 -
Prospect Reservoir - 2.8 - - - - - - 14.3 - - 2.5 - - - - 2.0 43.4 86.2 1.0 - - 3.8 1.2 - 0.3 - - - -
Richmond RAAF 0.2 0.6
- - - - - 9.6 - - - - - - - - 55.8 56.4 1.6 0.2 - 2.8 3.4 0.6 - - - - -
Sackville - 1.2 - - 0.2 - - - 3.4 0.2 0.2 0.2 0.2 - 0.2 - 0.6 45.2 34.0 1.8 0.2 0.2 2.8 3.2 2.6 0.2 - - 0.2 -
Seven Hills (Radio FM 103.2) - 2.0 0.5 - - - - - 17.5 - - - - - - - 1.0 48.0 38.5 0.5 - - 2.0 1.5 - - - - - -
Seven Hills (Collins St)
4.4





16.8







52.6 51.0 1.2


5.0





South Creek (Elizabeth Drive)
2.5






0.5






16.5 20.0


0.5 2.0 1.5




St Clair (Juba Close) - 2.0 - - - - - - 13.0 - - - - - - - - 44.0 32.0 - - - - 4.0 - - - - - -
Toongabbie Bowling Club - 1.5 0.5 - - - - - 16.0 - - 0.5 - - - - 0.5 55.0 46.5 1.0 - - 1.5 2.0 - - - - - -
Toongabbie Ck (Redbank Road (Toongabbee - 1.5 - 0.5 - - - - 15.0 - - - - - - - 1.0 57.5 29.0 3.0 - - 1.5 2.0 - - - - - -
West Pennant Hills (Cumberland S F Alert - 1.0 0.5 - 1.0 - - - 31.5 - - 1.0 - - - - 5.0 80.0 53.5 - - 0.5 1.0 2.5 5.5 - - - - -
Willmot (Resolution Ave) - 4.0 - - - - - - 17.0 - - 1.0 - - 1.0 1.0 - 26.0 37.0 1.0 9.0 - 2.0 2.0 1.0 - - - - -
Windsor SWC (Hawkesbury River) - - - - - - - - 5.0 - - - - - - - - 75.0 44.0 9.0 - - 3.0 3.0 1.0 - - - - -
Illawarra (68)123456789101112131415161718192021222324252627282930
Camden Airport AWS - 2.2 - - - - - - - - - - - - - - - 58.0 75.4 0.6 - 0.8 1.8 3.2 0.6 - - - - -
Campbelltown (Kentlyn (Georges River Roa - 2.0 - - - - - - - - - 2.0 - - - - - 27.0 79.0 1.0 - - 1.0 3.0 6.0 - - - - 1.0
Campbelltown (Mount Annan) - 15.8 - - - - - - - - - - - - - - - 44.2 80.4 0.2 - 0.4 1.4 2.4 - - - - - -
Rossmore (South Creek) - 3.0 - - - - - - - - - - - - - - - 44.0 73.0 1.0 - 1.0 2.0 2.0 2.0 - - - - -

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 Tuesday 1 May 2012. 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