New South Wales in December 2010: Cold, wet start to Summer

  • 8th wettest December on record for NSW.
  • 2nd wettest December on record for the MDB.
  • 5th coldest December on record for NSW (maximum temperatures).
  • 6th consecutive month with above average rainfall in NSW.

Rainfall

NSW experienced a wet start to summer, under the continued influence of the strong La Niña event in the Pacific Ocean. This was the 6th consecutive month with above average rainfall for NSW - a response consistent with patterns typically expected during a La Niña event. The statewide average rainfall for the month was 95.6 mm which is well above the historical average1 of 54.2 mm. This is the wettest December since 2007, when 106.6 mm was recorded, and the 8th wettest December on record for NSW (records since 1900). Additionally, this is the 4th consecutive December with above average rainfall for NSW.

The Murray Darling Basin also recorded above average rainfall, with a basin-wide average of 104.12 mm which is more than double the historical average of 48.8 mm, and significantly wetter than December 2009 (76.2 mm). This was the 2nd wettest December on record for the MDB (records since 1900), following the record rainfall of 120.7 mm set in 1992.

Thirty-three stations recorded their wettest December on record this month, with an additional 45 recording their wettest since at least the 1980s. Rainfall was highest along the Ranges and Tablelands, with large areas experiencing their highest totals on record, while very much above average falls were also recorded along the southwestern and northeastern borders. The most significant rainfall occurred during the first ten days of the month, particularly over southern and western regions, resulting in widespread flooding. However, the highest daily totals anywhere in the state occurred on Christmas Day, with rainfall reaching 155mm at Mullumbimby in northeastern NSW.

Some sites had their highest total December rainfall on record.
See a map of rainfall deciles.

Temperature

Day-time temperatures were significantly cooler than average during December, marking the 5th consecutive month with below average maximum temperatures for NSW. The statewide average maximum temperature for the month was 28.4°C, which is 2.2°C below the historical December average1 of 30.6°C. This is the coolest December since 1999 in NSW (28°C), and the 5th coolest on record. Additionally, seven stations across NSW recorded their lowest December mean maximums on record during the month. The below average day-time temperatures experienced across NSW is consistent with the pattern typically expected during a La Niña event. However, warm sea surface temperatures off the NSW coast associated with the La Niña event resulted in warm temperatures at the offshore islands, including the warmest December day on record at Norfolk Island on the 28th.

Statewide average minimum temperatures were also slightly below average during the month at 15.9°C, which is 0.2°C below the historical average of 16.1°C. This is the coolest December since 2001 (15.5°C) for minimum temperatures in NSW. Minimum temperatures varied considerably across the state, with above average minimums in eastern NSW but below average minimums in the west, including record cold nights at nine stations. Nights were particularly cold on the 20th and 21st, with temperatures up to 12°C below average in central NSW and record cold at nine stations.

The statewide average mean temperature for December was 22.1°C, which is 1.2°C below the historical average of 23.3°C. This is the coolest December since 1999 for statewide average mean temperatures, and the 10th coolest December on record.

Some sites had their highest December temperature on record.
Some sites had their lowest December mean daily maximum temperature on record.
See a map of maximum temperature anomalies.

Some sites had their lowest December temperature on record.
Some sites had their warmest December night (highest daily minimum temperature) on record.
See a map of minimum temperature anomalies.

Other phenomena

A deep low pressure system over the Tasman Sea was responsible for a significant cold snap from the 19-21st December. Minimum temperatures were up to 5 degrees below average across many parts of NSW, and snow was observed on the Snowy Mountains.

Heavy rain during the last week of November and first weeks of December lead to substantial flooding during early December, with widespread evacuations of towns including Wee Waa, Coonamble, Queanbeyan and Wagga Wagga. The Burrinjuck and Captains Flat dams were in danger of failure, with 135 flood rescues and over 2800 requests for assistance to the SES between November 29 and December 13. Forty-one individual shires across the state had Natural Disasters declared during early December, with major infrastructure damage in key rural centres including Orange, Dubbo, Wagga Wagga and Tamworth. Reports suggested this was the most severe flooding in 50 years in some regions. This was further exacerbated in late December by rainfall in northern NSW and Queensland, which progressed down river systems during late December and early January and resulted in 700 further requests for assistance between the 13th and 29th of December.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in December 2010
Hottest day 44.0 °C at Pooncarie Mail Agency on the 31st
Warmest days on average 31.8 °C at Wanaaring Post Office
Coolest days on average 14.6 °C at Charlotte Pass (Kosciusko Chalet)
Coldest day

4.2 °C at Charlotte Pass (Kosciusko Chalet) on the 20th

Coldest night -3.0 °C at Oberon (Springbank) on the 21st
-3.0 °C at Thredbo AWS on the 28th
Coolest nights on average 5.2 °C at Charlotte Pass (Kosciusko Chalet)
Warmest nights on average 20.6 °C at Lord Howe Island Aero
Warmest night 25.9 °C at Tibooburra Post Office on the 31st
Warmest on average overall 25.5 °C at Tibooburra Post Office
Coolest on average overall 9.9 °C at Charlotte Pass (Kosciusko Chalet)
Wettest overall 707.0 mm at Limpinwood (Bald Mountain)
Wettest day 155.0 mm at Mullumbimby (Chincogan ) on the 25th
Highest wind gust 104 km/h at Coonabarabran Airport AWS on the 19th
104 km/h at Murrurundi Gap AWS on the 20th

Record highest total December rainfall
Total rainfall
for December 2010 (mm)
Previous wettest
for December
Years of
record
Average for
December
Gunnedah Pool 232.4 185.8 in 2004 133 69.8
Coonabarabran (Namoi Street) 293.8 289.6 in 2007 131 71.1
Gulgong Post Office 241.1 212.8 in 1958 130 67.3
Wellington (Agrowplow) 184.6 173.2 in 2009 130 56.4
Hill End Post Office 257.6 220.4 in 1926 129 69.1
Crookwell Post Office 270.8 212.4 in 1947 128 66.9
Molong (King St) 241.4 214.8 in 1947 124 64.4
Cumnock (Willow Park) 283.0 200.2 in 1992 121 57.8
Parkes (Macarthur Street) 212.8 171.9 in 1947 121 52.3
Binnaway (Wattle St) 272.0 233.4 in 2007 107 65.6
Bathurst Agricultural Station 219.4 194.5 in 1947 103 65.7
Burrinjuck Dam 260.5 243.5 in 1947 102 62.6
Geurie Post Office 198.0 190.4 in 2007 101 51.2
Dunedoo Post Office 279.4 194.8 in 1926 99 62.7
Manildra (George St) 252.6 204.5 in 1920 99 57.4
Lake Victoria Storage 140.1 98.7 in 1975 89 20.4
Trangie Research Station AWS 145.2 137.4 in 1992 82 41.6
Cowra Research Centre (Evans St) 225.3 203.2 in 1971 68 57.9
Tharwa General Store 220.4 159.6 in 1961 66 52.0
Gunnedah Resource Centre 247.6 194.4 in 2004 63 71.4
Coffs Harbour MO 395.4 383.2 in 1991 62 145.3
Orange Agricultural Institute 299.9 213.6 in 1992 45 83.4
Canberra (Australian National Botanic Ga 145.0 143.6 in 1999 43 57.8
Orange Airport Comparison 301.0 193.0 in 1992 43 78.7
Thredbo Village 273.8 216.6 in 1988 41 123.0
Merriwa (Roscommon) 219.2 196.5 in 1970 40 70.2
Murwillumbah (Bray Park) 499.9 318.6 in 1988 39 168.5
Goulburn TAFE 228.4 131.4 in 1999 37 62.5
New Italy (Vineyard Haven) 266.4 178.4 in 2004 27 93.8
Parkes Airport AWS 239.4 140.2 in 2007 23 52.2
Hampton (Bindo) 180.0 146.2 in 1992 22 78.7
Blayney (Orange Road) 239.4 184.0 in 1992 21 78.6
Oberon (Jenolan Caves Road) 177.0 153.6 in 1992 21 75.3



Record highest December temperature
Highest temperature
in December 2010 (°C)
Previous warmest
for December
Years of
record
Average for
December
Norfolk Island Aero 28.2 on the 28th 27.9 on the 25th in 1953 72 23.4



Record lowest December mean daily maximum temperature
Mean daily maximum
temperature
for December 2010 (°C)
Previous coolest
for December
Years of
record
Average for
December
Tibooburra Post Office 31.7 31.8 in 1999 100 34.9
Wellington (Agrowplow) 28.0 28.1 in 1992 92 31.6
Casino Airport 27.5 = 27.5 in 1999 91 31.2
Collarenebri (Albert St) 30.2 = 30.2 in 1927 90 34.8
Peak Hill Post Office 28.1 28.2 in 1992 42 31.4
Tabulam (Muirne) 23.5 23.7 in 1999 40 27.0
Gulgong Post Office 26.5 = 26.5 in 1992 37 29.7



Record lowest December temperature
Lowest temperature
in December 2010 (°C)
Previous coolest
for December
Years of
record
Average for
December
Parkes (Macarthur Street) 6.2 on the 20th 6.7 on the 11th in 1964 54 16.2
Wilcannia (Reid St) 8.4 on the 20th 8.6 on the 13th in 1995 54 18.2
Glen Innes Post Office 2.9 on the 21st 3.4 on the 29th in 2004 48 12.1
Inverell Research Centre 5.8 on the 21st 6.0 on the 29th in 2004 45 15.0
Trangie Research Station AWS 6.2 on the 20th 6.7 on the 28th in 1993 43 16.6
Tabulam (Muirne) 9.7 on the 21st = 9.7 on the 13th in 1995 41 16.2
Lostock Dam 6.5 on the 20th 7.3 on the 18th in 1969 39 16.1
Glen Innes Ag Research Stn 2.0 on the 21st = 2.0 on the 29th in 2004 36 12.1
Oberon (Springbank) -3.0 on the 21st 0.4 on the 4th in 1987 28 8.8



Summary statistics for December 2010
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2010
Diff
from
average
Highest for
December
2010
Mean for
December
2010
Diff
from
average
Lowest for
December
2010
Total for
December
2010
Average
for
December
Rank of
December
2010
Fraction of
December
average
Western (Far Northwest) (district 46)
Fowlers Gap AWS 31.2   40.9 31st     10.3 20th 64.6
Tibooburra Airport 31.6   39.2 31st 19.0   12.9 20th 50.4
Tibooburra Post Office 31.7 -3.2 39.2 31st 19.3 -1.0 12.9 20th 61.6 22.2 v high 277%
White Cliffs AWS 31.7   41.3 31st 18.3   10.3 20th 29.0
White Cliffs Post Office 31.5 -3.0 41.5 31st 17.1 -2.1 8.6 20th 27.3 25.2 average 108%
Wilcannia (Reid St) 31.5 -2.4 41.9 31st 17.0 -1.2 8.4 20th 24.4 26.0 average 94%
Wilcannia Aerodrome AWS 31.6   42.0 31st 16.8   9.1 20th 25.0
Western (Lower Darling) (district 47)
Broken Hill (Patton Street) 30.0 -1.4 41.8 31st 16.4 -0.7 9.6 20th 47.4 21.7 high 218%
Broken Hill Airport AWS 29.5 -1.6 41.0 31st 15.8 -1.3 9.0 20th 33.2 21.7 high 153%
Lake Victoria Storage 28.7 -1.6 42.5 31st 15.2 -0.1 10.5 27th 140.1 20.4 highest 687%
Menindee Post Office 30.9 -1.9 43.0 31st 16.9 +0.2 11.8 20th 46.8 22.0 high 213%
Pooncarie Mail Agency 31.0   44.0 31st 15.6   9.9 21st 47.8 21.6 high 221%
Western (Upper Darling) (district 48)
Bourke Airport AWS 30.3   36.7 15th 18.1   8.0 21st 195.2
Brewarrina Hospital 30.1 -5.0 36.8 31st 18.4 -0.5 9.9 21st 139.4 38.7 v high 360%
Cobar Airport AWS 29.8   39.2 31st 16.3   7.9 21st 56.4
Cobar MO 29.5 -3.1 39.0 31st 16.9 -1.8 9.5 20th 78.0 37.0 high 211%
Collarenebri (Albert St) 30.2 -4.6 37.3 31st 18.8 -0.2 8.8 21st 128.2 53.2 v high 241%
Lightning Ridge Visitors Information Cen 30.7   37.5 31st 18.6   8.9 21st 81.7
Wanaaring Post Office 31.8   40.3 31st 18.7   9.2 21st 24.2 28.8 average 84%
Western (Southwest Plains) (district 49)
Balranald (RSL) 28.8 -2.1 41.6 31st 14.7 0.0 8.1 20th 68.6 25.2 v high 272%
Ivanhoe Aerodrome AWS 30.1   41.9 31st 16.2   9.6 28th 43.0
Ivanhoe Post Office 31.0 -2.4 43.2 31st 15.6 -0.7 9.0 29th 38.2 26.2 high 146%
Central Western Plains (South) (district 50)
Condobolin Ag Research Stn 30.1 -1.6 39.7 31st 15.5 -0.2 7.5 22nd 40.6 40.3 average 101%
Condobolin Airport AWS 29.6   39.4 31st 15.3   7.7 22nd 55.8
Peak Hill Post Office 28.1 -3.3 36.5 31st 17.1 -0.1 6.8 20th 163.2 50.4 v high 324%
West Wyalong Airport AWS 29.2   39.4 31st 14.3   7.7 28th 120.0
Central Western Plains (North) (district 51)
Coonamble Airport AWS 28.8   35.6 31st 17.2   6.8 20th 213.2
Nyngan Airport 29.9 -3.1 39.0 31st 17.2 -0.6 9.0 21st 63.8 42.8 high 149%
Trangie Research Station AWS 28.8 -3.1 37.3 31st 16.4 -0.2 6.2 20th 145.2 41.6 highest 349%
Northwest Plains (West) (district 52)
Mungindi Post Office 30.5 -4.0 37.7 31st 18.9 0.0 8.2 21st 58.4 51.6 average 113%
Walgett Airport AWS 30.1   36.7 31st 18.0   7.8 21st 126.6
Northwest Plains (East) (district 53)
Moree Aero 29.6   36.9 31st 17.9   8.1 21st 30.2
Northwest Slopes (North) (district 54)
Barraba Post Office 27.8 -2.8 34.0 31st 14.7 +0.1 4.0 21st 94.7 77.4 average 122%
Northwest Slopes (South) (district 55)
Gunnedah Pool 28.8 -4.2 35.0 31st 17.5 +0.7 8.8 21st 232.4 69.8 highest 333%
Gunnedah Resource Centre 27.9 -3.2 34.2 31st 17.4 -0.1 8.6 20th 247.6 71.4 highest 347%
Quirindi Post Office 28.3 -2.9 35.0 31st 15.1 +0.3 5.4 21st 149.9 80.9 v high 185%
Tamworth Airport AWS 27.7   33.8 31st 15.8   5.6 21st 161.0
Woolbrook (Danglemah Road) 23.3 -3.0 29.5 31st 12.5 +1.9 2.0 21st 168.4 98.4 v high 171%
Northern Tablelands (West) (district 56)
Armidale (Tree Group Nursery) 22.9   28.1 30th 12.2   1.2 21st 90.6
Armidale Airport AWS 22.0   26.9 31st 12.5   3.8 21st 126.0
Glen Innes Ag Research Stn 22.2 -2.2 28.5 30th 12.7 +0.6 2.0 21st 105.7 109.8 average 96%
Glen Innes Airport AWS 21.6   26.2 13th 12.7   0.0 21st 117.4
Glen Innes Post Office 22.8 -3.0 30.1 30th 13.6 +1.5 2.9 21st 92.7 108.2 average 86%
Guyra Hospital 20.8 -1.8 25.4 31st 11.2 +0.5 1.4 21st 113.8 113.8 average 100%
Inverell (Raglan St) 26.0   33.2 31st 14.7   4.0 21st 108.8
Inverell Research Centre 25.5 -2.8 31.7 31st 15.4 +0.4 5.8 21st 130.0 98.3 high 132%
Tenterfield (Federation Park) 22.8 -3.9 28.3 9th 14.2 +1.2 2.5 21st 175.8 105.6 high 166%
Northern Tablelands (East) (district 57)
Tabulam (Muirne) 23.5 -3.5 28.8 13th 15.7 -0.5 9.7 21st 341.0 154.0 v high 221%
Upper North Coast (district 58)
Alstonville Tropical Fruit Research Stat 25.5 -1.4 31.5 10th 19.0 +0.5 14.5 21st 180.3 148.6 high 121%
Ballina Airport AWS 26.8   31.1 17th 19.5   11.0 21st 414.4
Byron Bay (Cape Byron AWS) 26.2   29.6 15th 20.2   16.4 20th 463.8
Casino Airport 27.5 -3.7 33.8 10th 19.2 +1.4 10.8 21st 247.2 115.9 v high 213%
Casino Airport AWS 26.7   33.5 10th 19.1   10.9 21st 256.0
Evans Head RAAF Bombing Range AWS 26.8   35.3 10th 19.3   15.0 21st 270.2
Grafton Airport AWS 27.1   33.3 10th 18.6   8.7 21st 161.6
Grafton Olympic Pool 27.5 -2.2 33.9 10th 19.2 +0.8 11.0 21st 127.2 120.5 average 106%
Grafton Research Stn 27.1   33.3 10th 19.0   11.5 21st 99.8 101.5 average 98%
Lismore (Richmond Hill) 26.8   32.7 10th 19.0   12.4 21st 399.8
Lismore Airport AWS 27.1   33.3 10th 18.7   9.1 21st 311.6
Murwillumbah (Bray Park) 27.1 -2.2 32.8 17th 19.7 +1.3 11.8 21st 499.9 168.5 highest 297%
Yamba Pilot Station 26.0 +0.1 30.6 17th 19.9 +0.8 14.4 21st 191.6 116.8 high 164%
Lower North Coast (district 59)
Coffs Harbour MO 25.9 -0.4 33.2 10th 18.8 +0.7 9.6 21st 395.4 145.3 highest 272%
Dorrigo (Old Coramba Rd) 22.5   27.5 10th 13.7   3.6 21st 271.3
Kempsey (Wide Street) 27.2 -1.4 32.0 10th 18.0 +1.5 8.6 21st 226.0 110.4 v high 205%
Kempsey Airport AWS 26.9   32.9 10th 17.1   7.6 21st 200.4
South West Rocks (Smoky Cape Lighthouse) 25.9 0.0 29.0 15th     17.2 1st 172.8 120.0 high 144%
Manning (district 60)
Forster - Tuncurry Marine Rescue 25.2   29.5 16th 18.0   13.0 21st 96.0 92.7 average 104%
Port Macquarie Airport AWS 26.2   30.0 12th 17.5   8.0 21st 95.6
Taree Airport AWS 27.2   32.0 9th 17.3   8.2 21st 88.8
Yarras (Mount Seaview) 26.7 -2.0 34.0 9th 17.4 +1.3 8.0 21st 246.0 175.0 high 141%
Hunter (district 61)
Cessnock (Nulkaba) 28.7 -0.8 35.4 31st 16.7 +0.6 11.1 20th 52.2 70.2 average 74%
Cessnock Airport AWS 27.9 -1.1 35.2 31st 16.4 +1.7 10.6 22nd 68.8 76.9 average 89%
Cooranbong (Lake Macquarie AWS) 26.6   31.9 12th 16.2   9.3 21st 78.8
Gosford (Narara Research Station) AWS 26.7 -0.2 31.5 9th 16.2 +0.9 9.3 21st
Jerrys Plains Post Office 29.1 -2.2 37.0 31st 16.5 +0.8 7.0 21st 107.3 68.2 high 157%
Maitland Visitors Centre     32.6 9th 17.1   10.4 22nd 62.9
Mangrove Mountain AWS 25.9   32.0 31st 15.7   9.8 20th 58.8
Merriwa (Roscommon) 26.8   33.6 31st 14.7   6.6 20th 219.2 70.2 highest 312%
Murrurundi Gap AWS 23.5   29.9 31st 14.3   5.7 20th 172.6
Murrurundi Post Office 26.4 -3.4 32.9 31st 14.4 +0.8 4.4 21st 161.6 90.1 v high 179%
Nelson Bay (Nelson Head) 25.6 -0.6 30.0 16th 18.9 +1.6 13.7 20th 45.9 94.9 low 48%
Newcastle Nobbys Signal Station AWS 24.4 -0.5 31.8 9th 18.9 +0.9 12.5 20th 56.8 81.1 average 70%
Newcastle University 27.5   33.3 9th 18.4   10.8 20th 60.6
Norah Head AWS 25.1   31.2 9th 18.2   13.3 20th 65.4
Paterson (Tocal AWS) 28.6 -0.5 35.7 31st 17.7 +1.5 12.0 20th 74.4 78.9 average 94%
Peats Ridge (Waratah Road) 25.7 -0.3 31.5 31st 15.8 +1.0 9.1 20th 88.4 95.1 average 93%
Scone Airport AWS 27.7   34.7 31st 15.5   6.8 21st 84.8
Singleton STP 28.6   35.5 31st 16.3   10.0 21st 69.4
Williamtown RAAF 28.1 +0.9 35.3 9th 17.2 +0.7 9.4 21st 51.8 79.4 average 65%
Central Tablelands (North) (district 62)
Gulgong Post Office 26.5 -3.2 34.0 31st 15.0 +0.1 5.8 20th 241.1 67.3 highest 358%
Mudgee Airport AWS 25.7   33.2 31st 14.4   4.7 21st 241.6
Nullo Mountain AWS 19.9   28.0 31st 11.6   2.5 20th 234.6
Central Tablelands (South) (district 63)
Bathurst Agricultural Station 24.3 -2.1 32.5 31st 11.8 +0.2 4.3 22nd 219.4 65.7 highest 334%
Bathurst Airport AWS 24.7   32.4 31st 11.9   4.4 22nd 218.6
Cowra Research Centre (Evans St) 27.3 -2.2 35.5 31st 14.8 +0.2 7.1 20th 225.3 57.9 highest 389%
Katoomba (Murri St) 21.4 -1.0 30.8 31st 12.2 +0.5 4.1 20th 224.6 123.2 high 182%
Lithgow (Cooerwull) 22.3   30.5 31st 11.8   3.3 22nd 164.8 78.0 v high 211%
Mount Boyce AWS 21.4   30.0 31st 11.5   2.9 20th 200.0
Oberon (Springbank) 20.3 -3.0 29.1 31st 9.7 +0.9 -3.0 21st 211.9 74.2 v high 286%
Orange Agricultural Institute 21.6 -2.8 29.5 31st 11.1 -0.2 3.2 20th 299.9 83.4 highest 360%
Orange Airport AWS 21.8   29.3 31st 11.2   3.4 20th 319.2
Orange Airport Comparison 21.9 -2.0 30.0 31st 11.5 +1.4 3.2 20th 301.0 78.7 highest 382%
Springwood (Valley Heights) 26.1   33.1 31st 15.8   10.0 20th 153.6 102.1 high 150%
Central Western Slopes (North) (district 64)
Coonabarabran (Namoi Street) 26.5 -4.1 33.1 31st 14.2 +1.0 4.0 21st 293.8 71.1 highest 413%
Coonabarabran Airport AWS 25.4   31.8 31st 15.2   6.4 20th 292.2
Dunedoo Post Office 27.4 -3.5 33.2 30th 15.9 +0.9 6.4 20th 279.4 62.7 highest 446%
Central Western Slopes (South) (district 65)
Cowra Airport AWS 27.7   35.6 31st 14.1   6.5 22nd 177.6
Cowra Airport Comparison 27.9 -2.3 36.0 31st 14.1 +1.0 7.6 22nd 178.6 53.3 v high 335%
Dubbo Airport AWS 27.9   35.3 31st 15.8   6.0 20th 167.6
Forbes Airport AWS 28.9   36.8 31st 14.9   6.7 20th 202.6
Parkes (Macarthur Street) 28.4 -2.3 36.5 31st 15.7 -0.5 6.2 20th 212.8 52.3 highest 407%
Parkes Airport AWS 27.5   35.5 31st 14.1   4.1 20th 239.4 52.2 highest 459%
Wellington (Agrowplow) 28.0 -3.6 36.0 31st 15.3 +0.2 5.5 21st 184.6 56.4 highest 327%
Metropolitan (East) (district 66)
Bankstown Airport AWS 27.2 -0.1 32.4 9th 17.2 +0.6 12.4 20th 77.0 67.2 average 115%
Canterbury Racecourse AWS 26.4   31.7 9th 17.2   11.1 21st 64.8
Holsworthy Control Range 26.9   31.9 31st 15.9   9.2 21st 96.2
Parramatta North (Masons Drive) 27.1 -0.4 32.2 31st 16.6 +0.4 11.6 21st 90.0 70.2 high 128%
Riverview Observatory 26.2 +0.4 31.1 9th 17.4 +1.1 11.8 20th 79.1 83.0 average 95%
Sydney (Observatory Hill) 25.8 +0.6 31.3 26th 18.9 +1.4 13.3 20th 83.2 77.9 average 107%
Sydney Airport AMO 26.7 +1.0 32.8 9th 18.8 +1.3 13.3 20th 105.6 73.8 high 143%
Sydney Harbour (Wedding Cake West) 23.3   28.6 12th 18.6   13.5 20th
Sydney Olympic Park (Sydney Olympic Pk A 27.4   32.9 23rd 18.4   13.1 20th 86.4
Terrey Hills AWS 25.1   30.2 9th 17.0   10.6 20th 90.8
Metropolitan (West) (district 67)
Badgerys Creek AWS 27.1   34.1 31st 15.9   10.6 22nd 131.2
Horsley Park Equestrian Centre AWS 27.3   33.9 31st 16.2   9.8 20th 79.2
Liverpool (Michael Wenden Centre) 27.3   31.9 23rd 16.2   11.6 21st 81.0
Prospect Reservoir 28.3 +0.9 33.3 31st 17.0 +0.7 12.0 20th 97.0 75.2 high 129%
Richmond RAAF 27.8   35.1 31st 16.7   11.2 21st 55.2
Illawarra (district 68)
Albion Park (Wollongong Airport) 25.6   32.0 26th 15.9   10.0 22nd 132.0
Bellambi AWS 23.9   31.1 26th 17.1   12.4 20th 125.4
Bowral (Parry Drive) 22.4 -1.6 31.6 31st 12.9 +1.3 5.8 20th 181.1 76.0 v high 238%
Camden Airport AWS 27.5 -1.0 34.6 31st 15.6 +0.5 8.8 21st
Campbelltown (Mount Annan) 27.2   34.1 31st 15.3   8.8 21st
Jervis Bay (Point Perpendicular AWS) 23.5   29.8 26th 16.8   12.4 20th 129.4
Kiama (Bombo Headland) 23.6   29.8 12th 17.1   12.5 20th 83.8
Nowra RAN Air Station AWS 25.8   33.3 26th 15.4   9.9 25th 156.6
South Coast (district 69)
Batemans Bay (Catalina Country Club) 25.1   32.9 26th 15.0   9.0 28th 107.6 81.1 high 133%
Bega AWS 24.0   30.8 31st 13.8   4.5 28th 198.4
Braidwood Racecourse AWS 23.1 -1.4 33.1 31st 11.0 +0.7 2.5 19th 96.2 61.7 high 156%
Green Cape AWS 21.2   24.8 29th 15.2   10.4 28th 88.0
Merimbula Airport AWS 22.8   27.1 29th 14.2   7.9 28th 167.4
Montague Island Lighthouse 21.7 0.0 25.6 26th 16.1 +0.2 10.9 20th 148.8 66.6 v high 223%
Moruya Airport AWS 24.0   31.8 26th 14.8   8.8 19th 117.0
Moruya Heads Pilot Station 22.6 -0.2 29.8 26th 15.6 +0.9 11.2 28th 116.6 74.0 high 158%
Narooma Vmr 21.8 -0.2 27.0 26th 15.2 +0.2 9.0 28th 209.5 74.0 v high 283%
Nerriga Composite 23.6 -1.1 33.4 31st 11.8 +0.9 5.0 19th 121.2 65.3 v high 186%
Ulladulla AWS 23.1   29.6 10th 16.1   11.6 28th 113.6
Southern Tablelands (Goulburn-Monaro) (district 70)
Bombala (Therry Street) 22.8 -1.1 34.3 31st 10.3 +1.5 2.0 28th 110.4 64.0 high 173%
Bombala AWS 21.7   32.9 31st 9.4   0.7 28th 96.6
Canberra Airport 25.0   33.9 31st 11.7   4.7 19th 198.4
Cooma Airport AWS 22.2   32.8 31st 9.0   -0.5 28th 79.8 53.3 high 150%
Cooma Visitors Centre 23.3 -1.8 30.2 30th 9.6 +0.6 0.7 28th 97.8 54.5 v high 179%
Goulburn Airport AWS 23.7   32.3 31st 11.8   4.0 22nd 232.4
Goulburn TAFE 23.9 -2.0 32.3 31st 12.3 +0.6 5.5 20th 228.4 62.5 highest 365%
Mount Ginini AWS 15.6   25.8 31st 6.4   -1.3 20th 242.6
Taralga Post Office 23.3 -1.0 32.5 31st 10.4 +0.6 2.2 22nd 147.7 66.5 v high 222%
Tidbinbilla Nature Reserve 22.9 -2.2 28.0 26th 11.3 +0.5 5.5 19th 132.9 64.3 high 207%
Tuggeranong (Isabella Plains) AWS 24.9   34.8 31st 12.1   5.4 19th 253.4
Yass (Linton Hostel) 26.1 -1.6 34.5 31st     5.4 22nd 176.4 55.6 v high 317%
Southern Tablelands (Snowy Mountains) (district 71)
Charlotte Pass (Kosciusko Chalet) 14.6 -0.9 21.5 31st 5.2 +1.5 -1.2 20th 187.2 154.7 high 121%
Perisher Valley AWS 15.1   23.3 31st 5.5   -1.8 28th 288.0
Thredbo Village 18.1 -1.0 26.0 31st 6.7 +1.4 -0.5 22nd 273.8 123.0 highest 223%
Southwest Slopes (South) (district 72)
Albury Airport AWS 27.1   38.1 31st 14.5   8.6 20th 74.2
Cabramurra SMHEA AWS 16.2   25.2 31st 8.0   -0.6 20th 218.0
Hume Reservoir 26.8 -1.8 38.2 31st 14.9 +0.6 8.9 20th 99.2 49.7 high 200%
Khancoban AWS 25.8   34.7 31st 11.8   5.7 28th 186.4
Tumbarumba Post Office 24.5 -1.4 34.0 31st 11.0 +1.5 5.0 22nd 160.5 70.9 v high 226%
Wagga Wagga AMO 27.9 -1.5 38.1 31st 14.2 +0.5 7.8 20th 151.2 46.3 v high 327%
Southwest Slopes (North) (district 73)
Burrinjuck Dam 26.2 -1.3 35.6 31st 14.1 +0.5 7.5 21st 260.5 62.6 highest 416%
Cootamundra Airport 27.3   36.5 31st 12.8   6.0 22nd 149.0
Grenfell (Manganese Rd) 27.0 -2.9 36.0 31st 14.0 -0.5 7.0 20th 119.6 54.2 high 221%
Gundagai (William St) 27.6   37.5 31st 13.9   7.7 22nd 121.3
Quandialla Post Office 29.1 -2.3 39.0 31st 14.9 0.0 7.0 20th 108.2 43.7 high 248%
Temora Airport 28.7   38.0 31st 13.5   6.7 20th 75.8
Wyalong Post Office 29.7 -1.0 40.8 31st 15.7 +0.4 8.3 20th 105.2 44.2 v high 238%
Young Airport 27.0   35.6 31st 12.6   6.0 22nd 231.0
Riverina (East) (district 74)
Corowa Airport 27.5 -2.6 40.0 31st 12.7 -0.9 6.4 28th 95.8 40.8 v high 235%
Deniliquin Airport AWS 28.4   41.2 31st 13.6   7.0 20th 63.8
Narrandera Airport 29.7   40.9 31st 15.0   8.1 28th 59.0 36.8 high 160%
Narrandera Golf Club 29.0 -1.5 40.2 31st 14.6 -0.5 8.0 20th 55.9 37.6 high 149%
Tocumwal Airport 27.8 -1.7 41.0 31st 14.5 +0.6 7.1 20th 73.9 33.8 high 219%
Yanco Agricultural Institute 29.7   40.8 31st 15.7   8.4 20th 49.2
Riverina (West) (district 75)
Griffith Airport AWS 29.8 -1.0 41.4 31st 14.8 -0.3 8.1 20th 68.0 33.5 high 203%
Hay (Miller Street) 29.2 -2.0 41.4 31st 14.7 -0.2 7.8 20th 50.6 27.0 high 187%
Hay Airport AWS 29.9   42.1 31st 14.0   7.5 28th 54.8
Hillston Airport 30.4 -1.1 41.2 31st 15.1 -1.3 8.0 20th 41.8 29.6 high 141%
Lake Cargelligo Airport 29.9 -2.6 40.0 31st 15.3 -1.4 7.6 20th 91.5 37.2 v high 246%

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in New South Wales 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 1 pm on Tuesday 4 January 2011. 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.

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