Wednesday, 4 January 2012 - Monthly Climate Summary for Tasmania - Product code IDCKGC27R0
Tasmania in December 2011: Warm and dry
December was warmer than average overall, with many warm days and nights in the latter half of the month. It was also drier than usual in most areas, except in the east, southeast and southern Midlands.
- Warm December days and nights
- Well below average rainfall in most areas
- Thunderstorms ensure average rainfall in the south and east
Warm December days
Conditions were cool for most of the first half of December, and especially in the first week. On the 4th, Lake Leake had its equal-coldest December day on record, the temperature only reaching 8.6 °C. Daytime temperatures were warmer than normal around the 9th and particularly in the latter half of the month, which resulted in above average maximum temperatures overall: by up to one degree in the eastern half and by up to two degrees in the west.
Warm December nights
Night time temperatures were also warmer than average, by up to one degree. The coldest temperatures were in the first week of the month when a high to the west directed cold southerly air across Tasmania, the temperature dropping to -3.7 °C at Liawenee on the 2nd. On the 5th, Cape Grim recorded its lowest December temperature on record with 6.6 °C. Much of the rest of the month was warmer than usual, except the 12th to 14th.
Average to below average rainfall
Monthly rainfall totals
were below average across most of Tasmania, except the east, southeast
and the southern Midlands where thunderstorms helped deliver close
to average rainfall. Some sites had their lowest total December rainfall for at least 20 years.
The most significant rainfall event of the month was on the 18th and 19th when 10 to 50 mm of rain was recorded in the north on the 18th in moist northerly winds, and with thunderstorms in the southeast the next day. There were further thunderstorms around the 24th and 25th which delivered up to 40 mm in the east, southeast, and Midlands.
Hobart: Heavy rain with flash flooding
ended up close to average in Hobart. Prior to the 19th, only about 22
mm of rain had fallen, but wet conditions on the 19th doubled that
amount. A thunderstorm that afternoon delivered heavy rain (the CBD
received 10 mm in 30 minutes and the Airport 16 mm in 10 minutes)
causing flash flooding in the Hobart area.
Day time temperatures were spot on average, with only 3 days where the temperature exceeded 25 °C, the warmest of which was 26.9 °C on the 9th. Night time temperatures were close to one degree above average.
|Extremes in December 2011|
30.7 °C at Ouse Fire Station on the 31st|
|Warmest days on average||23.8 °C at Ouse Fire Station|
|Coolest days on average||11.6 °C at Mount Wellington|
2.5 °C at Mount Wellington on the 4th|
-3.7 °C at Liawenee on the 2nd|
|Coolest nights on average||
3.3 °C at Liawenee|
|Warmest nights on average||
13.7 °C at Swan Island|
18.1 °C at Bicheno (Council Depot) on the 24th|
|Warmest on average overall||
17.5 °C at Launceston (Ti Tree Bend)|
|Coolest on average overall||7.6 °C at Mount Wellington|
126.8 mm at Mount Read|
14.0 mm at Hummocky Hills|
|Wettest day||50.4 mm at Yolla (Sea View) on the 19thh|
|Highest wind gust||104 km/h at Mount Read on the 19th|
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|Lowest total December rainfall for at least 20 years|
for December 2011 (mm)
Most recent December
at least this dry
|Waratah (Mount Road)||40.8||29.1||in 1960*||32||139.8|
|Strathgordon Village||69.5||49.0||in 1980||31||199.3|
* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported.
|Record lowest December daily maximum temperature|
Lowest daily maximum
in December 2011 (°C)
|Lake Leake (Elizabeth River)||8.6||on the 4th||= 8.6||on the 3rd in 2001||22||17.5|
|Record lowest December temperature|
in December 2011 (°C)
|Cape Grim BAPS (Comparison)||6.6||on the 5th||6.9||on the 27th in 2010||21||11.8|
|Highest December mean temperature for at least 20 years|
for December 2011 (°C)
Most recent December
at least this warm
|Burnie (Round Hill)||16.8||17.0||in 1975||36||15.2|
* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.
|Summary statistics for December 2011|
|Northern (district 91)|
|Bridport (Sea View Villas)||20.1||0.0||23.2||28th||11.7||+0.6||4.0||4th||22.8||43.1||low||53%|
|Burnie (Round Hill)||20.8||+1.4||27.0||28th||12.6||+1.5||6.5||1st||37.7||63.5||low||59%|
|Cape Grim BAPS (Comparison)||18.2||+1.0||22.3||31st||12.0||+0.2||6.6||5th||28.0||45.5||low||62%|
|Cressy Research Station||23.3||+0.7||28.1||28th||9.1||+0.7||0.8||5th||18.4||44.5||low||41%|
|Launceston (Ti Tree Bend)||23.4||+1.0||27.6||9th||11.5||+0.9||4.8||5th||25.6||46.4||low||55%|
|Luncheon Hill (Forestry)||20.1||+1.7||26.7||31st||9.3||+0.8||3.8||4th||41.6||92.4||v low||45%|
|Scottsdale (West Minstone Road)||20.8||0.0||24.4||24th||10.2||+1.1||3.0||4th||47.2||67.1||average||70%|
|Sheffield School Farm||20.4||+1.0||24.7||28th||9.3||+0.5||2.3||5th||45.0||68.1||average||66%|
|East Coast (district 92)|
|Bicheno (Council Depot)||19.5||-0.5||23.2||28th||12.4||+0.9||6.4||4th||43.2||68.2||average||63%|
|Fingal (Legge Street)||21.5||+0.1||29.4||31st||9.5||+0.9||0.6||2nd||39.2||49.9||average||79%|
|Lake Leake (Elizabeth River)||17.1||-0.4||24.4||31st||7.3||+0.4||-0.8||2nd||58.2||72.9||average||80%|
|Maria Island (Point Lesueur)||18.9||25.0||31st||12.4||6.2||4th||33.0|
|Orford (Aubin Court)||19.5||-0.9||25.6||28th||10.4||-0.1||5.4||4th||54.4||63.8||average||85%|
|St Helens Aerodrome||20.5||-0.4||27.1||28th||12.1||+0.6||5.3||2nd||40.4||49.0||average||82%|
|Swansea (Francis Street)||19.5||24.2||24th||11.0||3.9||2nd||58.8|
|Midlands (district 93)|
|Ross (The Boulevards)||23.1||+0.6||30.3||24th||8.7||+0.2||-0.6||2nd||20.0||39.3||low||51%|
|Southeast (district 94)|
|Bull Bay (Lauriston)||18.9||-0.9||24.0||31st||10.4||-0.2||5.0||4th|
|Cape Bruny (Cape Bruny)||18.7||+0.5||27.0||9th||11.0||+0.4||5.8||1st||49.2||59.0||average||83%|
|Cape Bruny Lighthouse||17.7||+0.7||25.9||9th||11.3||+1.0||5.1||1st||50.7||76.5||average||66%|
|Geeveston (Cemetery Road)||20.2||+0.3||28.0||9th||9.0||+0.4||2.5||14th||60.8||71.2||average||85%|
|Grove (Research Station)||20.9||27.8||9th||7.7||0.9||2nd||81.4|
|Hobart (Ellerslie Road)||20.3||0.0||26.9||9th||11.6||+0.8||5.8||2nd||52.4||56.7||average||92%|
|Maatsuyker Island Lighthouse||16.2||+0.5||25.0||18th||10.8||+1.2||5.2||4th||53.8||90.1||low||60%|
|Melton Mowbray (North Stockman)||21.8||+0.1||28.6||31st||9.2||+0.3||1.0||2nd||57.2||38.4||average||149%|
|Tunnack Fire Station||18.6||-0.8||24.8||31st||7.6||+0.2||-0.1||2nd||57.2||54.0||average||106%|
|Derwent Valley (district 95)|
|Bushy Park (Bushy Park Estates)||23.3||+1.3||30.6||31st||9.4||+0.3||2.0||2nd||35.2||50.5||average||70%|
|Maydena Post Office||20.6||+1.0||27.1||31st||7.7||+0.3||1.3||14th||44.8||87.5||low||51%|
|Ouse Fire Station||23.8||+0.9||30.7||31st||9.5||+0.9||2.3||5th||39.4||35.5||average||111%|
|Central Plateau (district 96)|
|Butlers Gorge||18.3||+1.7||24.1||30th||5.7||+0.2||-2.2||5th||46.4||125.6||v low||37%|
|Lake St Clair National Park||18.5||+1.3||24.6||31st||5.1||+0.1||-1.9||5th||57.6||130.8||v low||44%|
|West Coast (district 97)|
|Hartz Mountain (Keoghs Pimple)||16.1||+1.4||23.7||9th||5.8||+0.8||-0.5||4th||69.6||79.5||average||88%|
|Mount Read||13.5||+1.9||20.4||31st||4.6||+0.8||-1.3||1st||126.8||290.8||v low||44%|
|Scotts Peak Dam||20.7||+2.4||28.8||18th||8.2||+0.4||2.6||1st||95.8||150.6||v low||64%|
|King Island (district 98)|
|King Island Airport||19.7||+1.1||25.2||31st||11.7||+0.8||6.4||5th||33.0||50.6||average||65%|
|Flinders Island (district 99)|
|Flinders Island Airport||20.4||+0.3||25.7||24th||11.9||+0.1||4.3||2nd|
|Antarctica and Macquarie Island (district 300)|
A Monthly Climate Summary is prepared to list the main features of the weather in Tasmania 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 Wednesday 4 January 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 10 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
(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.