Monday, 3 October 2011 - Monthly Climate Summary for Tasmania - Product code IDCKGC27R0
Tasmania in September 2011: Dry in the north and east
Rainfall was below average across the north and east of Tasmania in September 2011, in marked contrast to August.
- Below average rainfall in the north and east
- Warmer than normal days
- Night time temperatures near average
- Record high September temperature of 20 °C at Devonport Airport on the 28th.
Dry in the north and east
Westerly winds prevailed for much of the month and several cold fronts crossed the state. This ensured monthly rainfall totals in the west were close to average. However, there were few rain-bearing systems that reached the north and east, so totals were well below average there. The wettest period was the 20th to the 23rd, with other wet periods including the 5th to the 11th, the 14th to the 18th, and the 29th to 30th. Mount Read had the state’s wettest day of the month on the 22nd when 50 mm was recorded. It was also the wettest location overall with a monthly total of 470 mm.
More mild days than cold
Average daytime temperatures were generally up to one degree warmer than normal. The warmest periods were around the first and third weeks of September and the 27th to 28th when milder northerly winds prevailed for much of the time. The warmest individual day was the 28th when temperatures at several locations exceeded 20 °C, peaking at 23.9 °C in Hobart. Devonport Airport recorded 20.0 °C, its highest September temperature on record. The coolest period was around the 7th to the 12th and the 23rd to 25th when cold southwesterly winds prevailed. The coldest day was at Mount Wellington when the temperature only reached a maximum of -1.1 °C on the 11th.
Near average night time temperatures
Cold nights and warm nights were interspersed throughout September. The warmest were around the 4th, 22nd and 29th under the influence of mild northerly winds, whilst the coldest were around the 2nd, 19th and the 24th to the 26th when conditions were generally still and clear. Nights were also cold around the 7th, 8th, 11th and 12th when southwesterly winds directed cold air over Tasmania. The lowest temperature of the month was -5.1 °C recorded at Butlers Gorge on the 19th, whilst the mildest morning was 13.7 °C at Flinders Island on the 29th. Overall, night time temperatures were up to a degree warmer than average in the south and west, and up to one degree cooler than average in the east.
Hobart: warm September days
September days were warmer than normal in Hobart, averaging 16.3 °C (1.2 °C above average). The warmest days were from the 2nd to the 6th, the 12th to the 22nd and the 26th to 29th in mild northerly winds. Every day from the 16th to the 22nd was warmer than 17 °C; the last time Hobart had seven consecutive September days over 17 °C was in 2000. In total, there were 14 days where the temperature was 17 °C or more (almost double the average of 8 days), and only 2 days where the maximum temperature remained below 12 °C (against an average of 5 such cold days).
Night time conditions were just warmer than normal for September, averaging 7.1 °C. The coldest morning was on the 2nd when the temperature fell to 3.2 °C and the warmest on the 22nd and 29th when the temperature only dropped to 12.0 °C.It was drier than average in Hobart for most of September. A cold front delivered 14 mm on the last two days which raised the monthly total to 46 mm, close to half the 88 mm received last year but only 8 mm below the long-term average. Days were generally sunnier due to the lack of cloud; Hobart Airport averaging 7 hours of bright sunshine per day which is about an hour more than normal for September.
|Extremes in September 2011|
23.9 °C at Hobart (Ellerslie Road) on the 28th|
|Warmest days on average||
17.0 °C at Friendly Beaches|
|Coolest days on average||
5.4 °C at Mount Wellington|
-1.1 °C at Mount Wellington on the 11th|
-5.1 °C at Butlers Gorge on the 19th|
|Coolest nights on average||
-0.6 °C at Mount Wellington|
|Warmest nights on average||
9.6 °C at Hogan Island|
13.7 °C at Flinders Island Airport on the 29th|
|Warmest on average overall||
12.4 °C at Eddystone Point|
|Coolest on average overall||
2.4 °C at Mount Wellington|
470.4 mm at Mount Read|
15.2 mm at Swansea (Francis Street)|
|Wettest day||49.6 mm at Mount Read on the 22nd|
|Highest wind gust||
135 km/h at Cape Grim BAPS on the 23rd|
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|Record highest September temperature|
in September 2011 (°C)
|Devonport Airport||20.0||on the 28th||19.6||on the 20th in 2010||20||14.1|
|Record highest September mean daily maximum temperature|
Mean daily maximum
for September 2011 (°C)
|Eddystone Point||16.8||16.7||in 2001||53||14.8|
|Wynyard Airport||15.6||= 15.6||in 2009||23||14.3|
|Summary statistics for September 2011|
|Northern (district 91)|
|Bridport (Sea View Villas)||15.3||+0.6||19.6||28th||2.0||25th||40.1||74.3||v low||54%|
|Burnie (Round Hill)||15.6||+1.3||17.6||1st||7.7||+0.9||3.5||7th||73.2||87.4||average||84%|
|Cape Grim BAPS (Comparison)||13.8||+0.4||17.5||22nd||8.9||+0.3||5.2||24th||66.0||76.6||average||86%|
|Cressy Research Station||15.3||+0.7||20.2||28th||4.1||+0.2||-2.5||8th||35.8||61.7||v low||58%|
|Launceston (Ti Tree Bend)||16.6||+1.1||22.5||28th||5.1||-0.1||0.1||8th||29.0||65.9||low||44%|
|Luncheon Hill (Forestry)||13.3||+1.0||18.8||28th||5.6||+0.2||0.9||24th||112.2||175.4||low||64%|
|Scottsdale (West Minstone Road)||14.8||+0.6||20.6||28th||4.8||+0.1||-1.2||8th||52.2||98.4||low||53%|
|Sheffield School Farm||13.7||+0.7||18.4||28th||4.8||+0.1||-0.8||24th||52.6||123.6||v low||43%|
|East Coast (district 92)|
|Bicheno (Council Depot)||16.7||+0.6||21.6||4th||7.5||+0.2||2.3||2nd||36.6||44.3||average||83%|
|Fingal (Legge Street)||15.8||+0.6||19.5||3rd||2.2||-1.1||-3.7||8th||17.4||49.3||low||35%|
|Lake Leake (Elizabeth River)||12.0||+0.7||19.3||28th||1.7||-0.3||-3.2||25th||44.2||70.8||low||62%|
|Maria Island (Point Lesueur)||14.9||19.7||21st||8.3||5.3||8th||35.4|
|Orford (Aubin Court)||15.8||+0.1||21.4||4th||5.3||-0.2||0.0||8th||35.6||51.6||average||69%|
|St Helens Aerodrome||16.2||+0.4||19.6||16th||6.3||-0.3||0.7||12th||41.0||49.3||average||83%|
|Swansea (Francis Street)||16.6||22.0||4th||5.6||-0.4||25th||15.2|
|Midlands (district 93)|
|Ross (The Boulevards)||14.8||+0.4||20.5||28th||3.3||-0.3||-2.9||25th||41.0||53.0||average||77%|
|Southeast (district 94)|
|Cape Bruny (Cape Bruny)||14.4||+0.1||21.1||28th||7.4||0.0||4.9||25th||61.0||70.1||average||87%|
|Cape Bruny Lighthouse||14.0||+0.8||20.3||28th||6.9||-0.1||1.6||10th||70.2||81.3||average||86%|
|Geeveston (Cemetery Road)||15.0||+0.3||22.1||28th||5.3||+0.9||-1.1||2nd||80.8||93.5||average||86%|
|Grove (Research Station)||15.3||22.7||28th||4.5||-2.1||2nd||55.4|
|Hobart (Ellerslie Road)||16.3||+1.2||23.9||28th||7.1||+0.7||3.2||2nd||45.6||53.4||average||85%|
|Maatsuyker Island Lighthouse||12.6||+0.4||21.7||28th||7.5||+0.7||4.0||7th||135.8||109.7||high||124%|
|Melton Mowbray (North Stockman)||14.5||0.0||20.1||28th||4.2||-0.2||-1.4||25th||26.6||53.4||v low||50%|
|Tunnack Fire Station||12.5||+0.1||18.8||28th||3.3||0.0||-3.4||25th||35.0||65.6||low||53%|
|Derwent Valley (district 95)|
|Bushy Park (Bushy Park Estates)||16.2||+0.8||23.4||28th||4.0||+0.1||-1.4||2nd||43.2||54.2||average||80%|
|Maydena Post Office||13.3||-0.3||21.2||28th||3.7||+0.3||-1.5||25th||137.3||142.3||average||96%|
|Ouse Fire Station||15.7||+0.1||22.8||28th||4.2||+0.4||-2.0||2nd||42.6||73.4||low||58%|
|Central Plateau (district 96)|
|Lake St Clair National Park||10.5||+0.5||18.3||28th||1.5||+0.7||-3.1||2nd||237.6||217.2||average||109%|
|West Coast (district 97)|
|Hartz Mountain (Keoghs Pimple)||8.2||-0.3||16.4||28th||2.0||+0.3||-1.0||9th||96.8||101.7||average||95%|
|Scotts Peak Dam||12.1||0.0||22.4||28th||4.3||0.0||1.3||24th||252.0||222.1||average||113%|
|King Island (district 98)|
|King Island Airport||15.5||+1.0||21.5||22nd||8.5||+0.2||3.1||24th||56.8||87.7||low||65%|
|Flinders Island (district 99)|
|Flinders Island Airport||16.0||+1.0||21.4||28th||8.2||+0.7||-1.0||25th||36.0||63.6||low||57%|
|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 9 am on Monday 3 October 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 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.