Tasmania in October 2011: Several cold nights, some warm days

There were relatively few cold fronts crossing Tasmania during October, with the state often finding itself in cool air on the eastern flank of a high south of the Bight. Rain was average or below-average in most areas. Most of the time it was cooler than usual, but there was some warm weather.

  • Cool weather more frequent than warm
  • Some very cold nights
  • A few very warm days
  • Average to below-average rainfall

Plenty of cool days, but a few hot ones

Cool days were common in Tasmania for most of October. There were some particularly chilly days at the start of the month, the 9th to the 11th, the 16th and around the 24th, when temperatures were struggling to get into the low teens. In each case Tasmania found itself in cool air on the eastern flank of a high south of the Bight. In stark contrast the period from the 18th to the 20th was very warm, with a high off the NSW coast and a front approaching from the west bringing northerly winds that pushed temperatures in the southeast into the high 20s; Bushy Park reached 30 C on the 19th.

Despite the cool days, most areas of the state had a relatively warm month overall, with most sites recording daytime temperatures about half a degree warmer than the long-term average for October. Maximum temperatures were cooler than usual in the east, but only by half a degree or so.

Some very cold nights

There were several very cold nights during October, with Liawenee dropping below -5 C on the 2nd, 3rd, 10th and 25th. Strahan and Dover had their lowest October temperature on record on the morning of the 2nd, after winds slackened and skies cleared after cool air had been brought across the state late in September. Another shot of cool air late in the month saw several areas dip below zero on the morning of the 25th; relatively late in the year for such a cold morning. There were a few mild nights, notably when several sites stayed in the high teens through to the morning of the 20th.

Taken over the whole month, overnight temperatures were below the October average for most of the state, but above average in the northwest, along the north coast and on the Bass Strait islands.

An average-to-dry month in most of Tasmania

There were fewer than usual rain-bearing systems crossing Tasmania during October. There were wet days, notably around the 11th, the 16th, the 24th and the 29th, but totals for the whole month were average or below in most areas. The main exceptions were on the northwest coast (especially because of heavy showers and thunderstorms on the 24th and the 29th) and the southeast (where southerly winds brought wet weather around the 29th).

Despite a relatively dry month, the western highlands still received over 150 mm. Lake Margaret Power Station's 231 mm was the wettest confirmed overall (the rain gauge on Mount Read registered 279 mm but was affected by snow on some days and the full total there is not known). Fingal, in the northeast, managed only 29 mm for the whole month.

Hobart: some warm days, some cold nights, average rain

Hobart's temperatures were fractionally above the long-term October average overall. Most days and nights were cooler than normal, but there were also 3 consecutive days over 25 C, peaking at 29.4 C on the 19th (the warmest day since mid-March). Along with the rest of the state, Hobart woke to a chilly morning on the 25th, with a minimum of just 2.8 C. 61.2 mm of rain for the month was just half a millimetre less than the long-term average. There were three particularly wet times for Hobart: the evening of the 8th when a thunderstorm delivered 8.4 mm in half an hour; the 15th to the 17th (with cold and showery weather and mountain snow) and the 29th (after a trough passed over the state).

Further information

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Extremes in October 2011
Hottest day 30.0 C at Bushy Park on the 19th
Warmest days on average 18.3 C at Bushy Park
Coolest days on average 7.7 C at Mount Wellington
Coldest day -0.4 C at Mount Wellington on the 11th
Coldest night -6.0 C at Liawenee on the 3rd
Coolest nights on average 0.4 C at Mount Wellington
Warmest nights on average 10.4 C at Hogan Island
Warmest night 18.0 C at Friendly Beaches on the 20th
Warmest on average overall 13.6 C at Eddystone Point
Coolest on average overall 4.1 C at Mount Wellington
Wettest overall 231.4 mm at Lake Margaret Power Station
Driest overall 28.8 mm at Fingal (Legge Street)
Wettest day 43.0 mm at Luncheon Hill on the 30th
Highest wind gust 128 km/h at Hogan Island on the 10th
128 km/h at Cape Grim on the 16th

Maps

Observed Anomaly Decile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window



Record lowest October temperature

Lowest temperature
in October 2011 (C)
Previous coolest
for October
Years of
record
Average for
October
Strahan Aerodrome -1.1 on the 2nd -0.1 on the 31st in 1995 23 7.3
Dover -0.5 on the 2nd = -0.5 on the 16th in 2006 22 6.4



Summary statistics for October 2011

Maximum temperatures
for October
(C)
Minimum temperatures
for October
(C)
Rainfall
for October
(millimetres)
Mean for
October
2011
Diff
from
average
Highest for
October
2011
Mean for
October
2011
Diff
from
average
Lowest for
October
2011
Total for
October
2011
Average
for
October
Rank of
October
2011
Fraction of
October
average
Northern (district 91)
Bridport (Sea View Villas) 16.7 +0.3 22.4 20th 8.2 +0.3 1.5 3rd 66.8 60.5 average 110%
Burnie (Round Hill) 16.3 +0.4 19.8 20th 9.0 +1.0 3.0 10th 100.8 85.7 high 118%
Cape Grim 14.5   20.0 19th 9.1   4.6 2nd 69.8


Cape Grim BAPS (Comparison) 14.9 +0.6 19.7 19th 9.0 -0.2 4.5 2nd 71.0 62.1 average 114%
Cressy Research Station 17.0 -0.1 23.8 20th 4.9 -0.2 -2.1 10th 41.4 49.5 average 84%
Devonport Airport 16.0 +0.2 19.8 20th 7.4 +0.1 1.4 10th 61.0 64.7 average 94%
Launceston (Ti Tree Bend) 18.2 +0.2 23.6 19th 6.4 -0.5 0.3 10th 38.8 51.0 average 76%
Launceston Airport 17.3   23.5 19th 5.0   -2.2 10th 50.2


Low Head 15.5 +0.2 19.3 20th 8.9 -0.6 4.9 2nd 67.4 54.4 average 124%
Luncheon Hill (Forestry) 16.3 +1.7 23.8 19th 6.2 +0.3 1.0 25th 144.6 133.5 average 108%
Marrawah 15.6 +0.7 22.5 19th 7.9 -0.2 3.9 2nd 93.8 89.0 average 105%
Scottsdale (West Minstone Road) 16.3 -0.1 22.5 19th 5.6 -0.2 -1.0 10th 57.8 83.4 average 69%
Sheffield School Farm 15.2 +0.2 21.4 20th 5.4 -0.3 -0.3 10th 87.4 82.2 average 106%
Smithton Aerodrome 16.8 +0.6 22.3 20th 6.9 0.0 0.2 10th 92.8 82.0 average 113%
Wynyard Airport 17.1 +1.1 23.1 22nd 6.1 0.0 -0.3 10th 94.6 97.9 average 97%
East Coast (district 92)
Bicheno (Council Depot) 16.9 -0.5 25.4 20th 8.4 -0.1 3.0 10th 44.6 55.7 average 80%
Eddystone Point 18.1 +1.7 27.0 20th 9.1 0.0 2.9 10th 57.8 69.2 average 84%
Fingal (Legge Street) 16.8 -0.6 26.0 19th 4.3 -0.6 -2.2 10th 28.8 54.4 low 53%
Friendly Beaches 17.6 -0.3 28.3 19th 8.3 -0.3 1.4 10th 40.4 59.1 low 68%
Lake Leake (Elizabeth River) 13.2 -0.5 21.6 20th 2.9 -0.6 -3.7 10th 50.6 75.2 average 67%
Maria Island (Point Lesueur) 15.7   23.9 20th 9.4   4.0 10th 34.0


Orford (Aubin Court) 16.7 -0.6 27.4 20th 7.5 +0.3 1.5 25th 49.6 59.8 average 83%
Scamander 17.0 -0.5 27.1 19th 7.9 -0.2 3.2 17th 65.4 62.8 high 104%
St Helens Aerodrome 17.0 -0.3 25.7 19th 7.6 -0.4 2.4 12th 62.4 69.5 average 90%
Swan Island 16.2 +0.2 23.0 20th 10.0 -0.2 4.5 10th 53.0 49.2 average 108%
Swansea (Francis Street) 16.3   27.3 19th 6.7   -0.1 10th 38.8


Midlands (district 93)
Ross (The Boulevards) 16.8 -0.2 24.6 20th 4.4 -0.5 -3.4 10th 41.4 42.7 average 97%
Southeast (district 94)
Bull Bay (Lauriston) 15.8 -0.8 28.0 19th 7.9 -0.2 3.5 25th 69.8 56.1 high 124%
Campania (Kincora) 17.6 -0.3 29.1 19th 6.1 -0.3 -0.3 2nd 43.0 40.5 average 106%
Cape Bruny (Cape Bruny) 15.4 +0.1 27.4 19th 8.2 0.0 4.1 11th 66.4 67.1 average 99%
Cape Bruny Lighthouse 14.8 +0.4 26.4 19th 8.5 +0.6 3.9 11th 69.6 83.5 average 83%
Dover 15.9 -0.2 28.1 19th 5.8 -0.6 -0.5 2nd 74.4 86.3 average 86%
Geeveston (Cemetery Road) 16.5 +0.1 28.3 19th 5.7 -0.3 -0.9 4th 91.0 91.5 average 99%
Grove (Research Station) 17.0   28.9 19th 4.5   -2.3 25th 75.2


Hobart (Ellerslie Road) 17.1 +0.2 29.4 19th 8.1 +0.3 2.8 25th 61.2 61.7 average 99%
Hobart Airport 17.0 -0.3 29.4 19th 7.8 +0.3 2.3 25th 40.6 46.5 average 87%
Maatsuyker Island Lighthouse 12.8 -0.5 23.4 19th 8.1 +0.7 5.1 1st 93.2 105.7 average 88%
Melton Mowbray (North Stockman) 16.6 0.0 27.5 19th 4.6 -1.0 -2.2 2nd 42.2 42.4 average 100%
Mount Wellington 7.7 +0.7 20.1 19th 0.4 +0.4 -5.1 25th



Tasman Island 13.1   23.3 19th 7.8   3.3 10th 90.6 62.2 high 146%
Tunnack Fire Station 14.3 -0.1 22.2 20th 4.1 -0.3 -3.5 2nd 53.2 54.6 average 97%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 18.3 +0.6 30.0 19th 5.3 -0.5 -2.0 2nd 48.4 57.3 average 84%
Maydena Post Office 16.0 +0.4 27.0 19th 4.1 -0.7 -3.0 2nd 107.7 117.9 average 91%
Ouse Fire Station 18.0 +0.4 28.7 19th 4.6 -0.7 -2.2 2nd 59.0 53.5 average 110%
Central Plateau (district 96)
Butlers Gorge 13.5 +1.0 23.6 19th 1.8 -0.6 -4.9 2nd 150.6 159.3 average 95%
Lake St Clair National Park 13.6 +1.0 24.0 19th 1.7 -0.3 -4.2 2nd 152.4 175.2 average 87%
Liawenee 11.8 +0.5 20.9 20th 0.7 +0.1 -6.0 3rd 49.8 71.1 average 70%
West Coast (district 97)
Cape Sorell 15.6 +1.3 21.0 19th 8.8 +0.2 4.0 2nd 80.6 108.6 low 74%
Hartz Mountain (Keoghs Pimple) 11.2 +0.5 22.3 19th 2.8 +0.2 -1.7 25th 107.0 91.7 average 117%
Mount Read 9.0 +1.5 19.5 19th 1.7 +0.4 -3.2 25th



Scotts Peak Dam 15.2 +0.9 27.2 19th 5.2 +0.2 -0.2 2nd 152.0 166.3 low 91%
Strahan Aerodrome 16.7 +0.7 28.1 19th 6.4 -0.9 -1.1 2nd 146.8 118.1 average 124%
Warra 13.6   26.3 19th 4.1   -2.7 2nd 175.0


King Island (district 98)
King Island Airport 16.6 +0.9 27.8 19th 9.2 +0.5 3.3 3rd 67.0 74.2 average 90%
Flinders Island (district 99)
Flinders Island Airport 17.0 +0.3 28.4 20th 8.1 -0.5 2.0 18th 66.6 60.3 average 110%
Hogan Island 15.9   26.8 20th 10.4   7.2 17th 69.4




Notes

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 3 pm on Tuesday 1 November 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 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