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Thursday, 1 September 2011 - Seasonal Climate Summary for Tasmania - Product code IDCKGC27R0
Two heavy flooding rain events in August meant it was a wet
in the northeast of Tasmania.
Night time and daytime temperatures were warmer than average this winter, following a very warm August. There were however, a few very cold nights, mostly in July.
The northeast received well above average rainfall due to wet conditions in June and August . Winter rainfall totals in the northeast generally ranged from 200 mm to 300 mm, increasing up to 900 mm at Mount Victoria (not far behind the usually wet Strathgordon in the southwest with 919 mm). Fingal recorded its wettest winter in 20 years with 347 mm following its wettest August on record. In contrast, the driest winter site was Maria Island off the southeast coast, where 104 mm was recorded.
Winter rainfall was generally close to average across the rest of Tasmania. Cold fronts delivered most of the state’s rainfall, along with the passage of low pressure systems across Bass Strait delivering rainfall to the north and east of Tasmania in July and August. In the south, Richmond and Huonville had their wettest winter days on record on 8 and 9 June respectively associated with the passage of a low pressure system and cold front.
There were two significant flooding events in the northeast this winter associated with complex areas of low pressure to the north of Tasmania. Both events were in August and within a week of each other, causing hundreds of thousands of dollars worth of damage to infrastructure.
Average minimum temperatures were up to 2 °C warmer
than normal for
winter, due largely to very warm nights in August
when several sites
across Tasmania had their warmest August minimum temperatures on
record. Nights were warm at the end of July too, with Bushy Park,
Butlers Gorge, Tarraleah Village and Strahan all recording their
warmest July nights on record on the 29th.
There were some very cold nights this winter however, most of those in July. Of particular note was the 23rd of July when Liawenee recorded its coldest temperature ever with -11.2 °C. The mix of a mild August and a cold July ensured that no other winter temperature records were set.
Daytime temperatures were close to the winter average overall,
generally on the warm side. The coldest days were in July. Many areas
were on track to record their coldest July in several years until a
warm spell developed at the end of the month. This warmth generally
persisted for the rest of winter. For most areas, their warmest winter
days were either at the start or the end of August.
Bicheno was the warmest winter location, recording an average winter maximum of 14.7 °C, whilst Mount Wellington, as usual, had the coolest days with a mean winter maximum of 4.0 °C.
In addition to the two flooding events in August, there were two other significant weather events in winter. Strong winds, large waves, and low level snow affected Tasmania in the first week of June, and again in the first week of July. Winds were especially damaging in the July event, and the waverider buoy off Cape Sorell recorded an exceptionally large 18.68 m wave.
Temperatures were warmer than normal overall and rainfall was
to average in Hobart this winter. Both the average maximum
the average minimum (5.9 °C) temperatures were close to one
warmer than the long-term winter average. Daytime temperatures were
below average for most of July, when Hobart was on track to record its
coolest July in 16 years, but temperatures rose at the end of the month
and remained warmer than average for most of winter. Hobart had 25
winter days were the maximum temperature was 15 °C or higher,
to the average of 14 days. The warmest day was on 24 August where the
temperature rose to 22 °C, which was the warmest winter day
Hobart did have some cold winter nights. On 16 June the temperature dipped to 0.8 °C, and every night from 23 July to 27 July it dropped below 2 °C, and right down to 0.6 °C on both 25 and 27 July. In contrast, it stayed above 11 °C from 17 to 21 August.
The 168 mm of rain that Hobart received this winter was very close to average, and slightly more than the 124 mm received last winter. There was 43 mm of rain over two days early in June, ensuring it was the wettest of the months this winter.
|Extremes in winter 2011|
|Hottest day||22.2 °C at Flinders
Island Airport on 4 Aug and 5 Aug
|Warmest days on average||14.7 °C at Bicheno
|Coolest days on average||4.0 °C at Mount Wellington|
|Coldest day||-2.9 °C at Mount
Wellington on 10 Jul
|Coldest night||-11.2 °C at Liawenee
on 23 Jul
|Coolest nights on average||-0.9 °C at Liawenee
|Warmest nights on average||9.2 °C at Hogan
|Warmest night||13.7 °C at Cape
Sorell on 25 Aug
|Warmest on average overall||11.4 °C at Hogan
|Coolest on average overall||1.7 °C at Mount
|Wettest overall||918.8 mm at Strathgordon
|Driest overall||103.4 mm at Maria
Island (Point Lesueur)
|Wettest day||141.4 mm at Mount
Victoria (Una Plain) on 9 Aug
|Highest wind gust||178 km/h at Mount
Wellington on 10 Jul
Click on a map to show it full size in a pop-up window
|Record highest winter daily rainfall|
|Highest daily rainfall
in winter 2011 (mm)
|Huonville (Tutton Avenue)||76.0||on 9 Jun||62.0||on 26 Jun 2009||42|
|Richmond (Strathayr)||53.8||on 8 Jun||46.4||on 12 Aug 2010||24|
|Highest total winter rainfall for at least 20 years|
for winter 2011 (mm)
|Most recent winter
at least this wet
|Fingal (Legge Street)||346.6||404.4||in 1981||30||174.9|
|Summary statistics for winter 2011|
|Northern (district 91)|
|Bridport (Sea View Villas)||13.7||0.0||16.7||18 Jul||5.7||-0.1||0.0||7 Jul||195.0||248.6||average||78%|
|Burnie (Round Hill)||13.7||+0.6||17.5||11 Jun||7.5||+1.3||1.3||13 Jun||307.4||338.0||average||91%|
|Cape Grim||12.7||15.6||19 Aug||8.5||2.8||15 Jun||310.4|
|Cape Grim BAPS (Comparison)||12.8||+0.1||16.2||22 Aug||8.4||0.0||3.3||15 Jun|
|Cressy Research Station||12.4||0.0||18.4||19 Aug||3.3||+1.5||-4.3||15 Jul||197.6||196.4||average||101%|
|Devonport Airport||13.3||+0.3||17.3||19 Aug||5.7||+0.8||-1.7||27 Jul||220.7||264.7||low||83%|
|Launceston (Ti Tree Bend)||13.6||+0.5||18.5||19 Aug||4.2||+1.3||-2.6||15 Jul||240.9||231.4||average||104%|
|Launceston Airport||12.3||17.8||19 Aug||3.5||-3.7||16 Jul||224.6|
|Low Head||13.0||-0.1||15.9||19 Aug||7.8||+0.6||1.0||27 Jul||179.4||224.2||low||80%|
|Luncheon Hill (Forestry)||11.2||+0.2||17.5||22 Aug||5.5||+0.3||0.5||21 Jul||567.4||545.1||average||104%|
|Marrawah||13.0||+0.4||17.5||22 Aug||7.7||+0.7||1.5||15 Jun||352.6||392.1||average||90%|
|Scottsdale (West Minstone Road)||12.5||+0.1||16.9||19 Aug||4.7||+0.8||-2.1||14 Jul||272.8||344.1||low||79%|
|Sheffield School Farm||11.5||+0.1||15.2||24 Jun||4.2||+0.5||-1.8||11 Aug||314.4||364.8||low||86%|
|Smithton Aerodrome||13.5||0.0||17.1||24 Aug||5.4||+0.5||-2.3||20 Jul|
|Wynyard Airport||13.5||+0.4||16.8||9 Aug||4.6||+0.8||-2.5||14 Jul||366.0||355.5||average||103%|
|East Coast (district 92)|
|Bicheno (Council Depot)||14.7||+0.3||22.0||4 Aug||6.7||+0.4||0.7||6 Jul||181.6||164.9||average||110%|
|Eddystone Point||14.3||+0.8||18.7||24 Aug||8.0||+0.6||1.2||14 Jul||204.2||223.6||average||91%|
|Fingal (Legge Street)||12.9||+0.2||19.8||4 Aug||2.0||+1.1||-5.4||27 Jul||346.6||181.0||v high||191%|
|Friendly Beaches||14.0||-0.2||21.4||4 Aug||6.4||+0.3||-0.6||16 Jul||209.2||153.1||high||137%|
|Lake Leake (Elizabeth River)||9.1||+0.1||14.4||1 Jun||1.5||+1.0||-6.3||16 Jul||345.2||243.5||high||142%|
|Maria Island (Point Lesueur)||13.0||18.8||4 Aug||8.0||3.5||11 Jul||103.4|
|Orford (Aubin Court)||13.3||-0.2||19.4||4 Aug||4.3||+0.4||-2.8||16 Jul||162.0||172.5||average||94%|
|Scamander||14.3||0.0||21.5||4 Aug||5.8||+0.7||-1.2||6 Jul||286.3||176.1||high||163%|
|St Helens Aerodrome||13.9||0.0||19.9||4 Aug||5.8||+0.6||-0.1||15 Jul||275.0||179.8||high||153%|
|Swan Island||13.6||18.0||2 Jun||9.0||4.0||15 Jul||223.8|
|Midlands (district 93)|
|Ross (The Boulevards)||12.0||+0.2||18.6||19 Aug||2.6||+0.8||-6.5||27 Jul||157.6||129.4||average||122%|
|Southeast (district 94)|
|Bull Bay (Lauriston)||12.8||0.0||20.0||24 Aug||6.3||+0.3||1.5||25 Jul||158.6||159.7||average||99%|
|Campania (Kincora)||13.8||+0.1||21.3||24 Aug||4.2||+0.6||-2.2||25 Jul|
|Cape Bruny (Cape Bruny)||12.4||0.0||19.8||25 Aug||6.8||0.0||2.2||23 Jul||228.4||239.7||average||95%|
|Dover||12.8||+0.1||20.2||25 Aug||4.4||+0.6||-1.8||25 Jul||315.4||255.1||high||124%|
|Geeveston (Cemetery Road)||12.7||+0.2||20.1||25 Aug||3.5||+1.1||-2.9||24 Jul||399.8||269.1||v high||149%|
|Grove (Research Station)||12.9||21.0||24 Aug||2.9||-4.7||27 Jul||280.0|
|Hobart (Ellerslie Road)||13.3||+1.1||21.7||24 Aug||5.9||+0.9||0.6||25 Jul||167.8||159.9||average||105%|
|Hobart Airport||13.5||+0.6||21.4||24 Aug||5.4||+1.0||-1.1||15 Jul||151.2||122.4||high||124%|
|Maatsuyker Island Lighthouse||11.6||+0.4||16.8||16 Aug||7.7||+0.9||1.3||11 Jul||284.5||370.0||low||77%|
|Melton Mowbray (North Stockman)||11.9||-0.1||19.4||24 Aug||2.7||+0.5||-5.1||16 Jun||166.2||117.9||high||141%|
|Mount Wellington||4.0||+1.2||10.8||19 Aug||-0.6||+0.8||-6.0||7 Jul|
|Tasman Island||11.1||17.6||4 Aug||6.9||1.4||7 Jul||220.8|
|Tunnack Fire Station||10.0||0.0||15.8||19 Aug||2.5||+0.5||-5.6||24 Jul||354.0||177.7||v high||199%|
|Derwent Valley (district 95)|
|Bushy Park (Bushy Park Estates)||12.8||+1.0||21.5||24 Aug||2.5||+0.6||-4.9||25 Jul||212.0||151.6||high||140%|
|Maydena Post Office||11.3||+0.2||19.0||25 Aug||2.9||+0.5||-3.5||24 Jul||484.1||362.6||high||134%|
|Ouse Fire Station||12.4||0.0||20.8||24 Aug||2.1||+0.6||-5.0||23 Jul||170.8||162.7||average||105%|
|Tarraleah Village||9.3||+0.5||16.5||24 Aug||-6.0||23 Jul||423.3||344.5||high||123%|
|Central Plateau (district 96)|
|Butlers Gorge||8.8||+1.3||16.7||19 Aug||0.7||+0.8||-6.3||16 Jul||641.2||512.2||high||125%|
|Lake St Clair National Park||8.1||+0.4||16.2||20 Aug||0.6||+0.5||-5.9||15 Jun||737.4||624.8||high||118%|
|Liawenee||6.7||+0.5||14.2||19 Aug||-0.9||+0.3||-11.2||23 Jul|
|West Coast (district 97)|
|Cape Sorell||13.1||+1.1||17.2||21 Aug||8.3||+1.0||2.8||24 Jul|
|Hartz Mountain (Keoghs Pimple)||7.0||+0.5||14.9||19 Aug||2.0||+0.3||-3.2||7 Jul|
|Mount Read||4.7||+0.6||11.2||19 Aug||0.7||+0.3||-3.7||6 Jul|
|Scotts Peak Dam||10.3||+0.6||20.4||19 Aug||3.9||+0.4||-2.3||24 Jul|
|Strahan Aerodrome||13.1||+0.5||18.4||16 Aug||6.1||+0.7||-2.1||24 Jul||476.8||498.3||average||96%|
|Strathgordon Village||10.2||+0.7||16.2||23 Aug||4.0||+0.6||-1.8||24 Jul||918.8||779.7||high||118%|
|Warra||9.5||17.0||25 Aug||-3.0||23 Jul|
|King Island (district 98)|
|King Island Airport||13.9||+0.3||18.4||3 Aug||8.3||+0.6||1.9||15 Jun||272.4||327.8||low||83%|
|Flinders Island (district 99)|
|Flinders Island Airport||14.4||+0.7||22.2||5 Aug||7.2||+0.6||-1.5||15 Jul||156.5||230.4||low||68%|
|Hogan Island||13.6||20.3||4 Aug||9.2||4.9||8 Jun||225.4|
|Antarctica and Macquarie Island (district 300)|
|Macquarie Island||4.8||-0.2||8.1||22 Jun||1.3||-0.3||-6.5||24 Jul||250.8||222.1||high||113%|
This statement has been prepared based on information available at 11 am on 1 September 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
years 1895 to 2100.
They are not shown for sites with less than 10 years of record in that
time, 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
climate record for the site,
based on the decile
ranking (very low rainfall is in decile 1,
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.