Thursday, 1 November 2007 - Monthly Climate Summary for Tasmania - Product code IDCKGC17R0

Tasmania in October 2007: Spring weather

Summary

Westerly winds and cold fronts dominated Tasmania's weather during October, bringing above-average rain to the west but below-average to the east. There were also some very warm days but some very cold nights, along with strong wind gusts — typical spring weather for Tasmania.

Details

Wet in the west, dry in the east: Westerly winds and cold fronts brought plenty of rain to the western highlands, with most sites there receiving well over 200 mm. As is typical with westerly winds, there was far less rain in the eastern half, with several sites in the Midlands and the Fingal Valley receiving less than 20 mm for the whole month, giving some sites in that area their driest October since 1982. Mount Read, in the western highlands, registered over 200 mm in 48 hours on its way to getting a total of 515 mm for the month (by way of comparison, most of eastern Tasmania has received less than 500 mm for the whole year so far).
Overall, totals were above average in the western half (and well above average in the highlands), but below average in the east (with the exception of the far northeast coast where some moderate falls around the 27th ensured the monthly totals were close to average). In parts of the Midlands and the Fingal Valley, totals were well below average.

Some warm days, but cool ones too: The cold fronts that brought an abundance of rain to the western half of the state were also the cause of warm days in the south and east, and sometimes to the west. This was particularly the case on the 20th, 27th and 28th when pre-frontal northerlies brought warm air from over the mainland across Tasmania and pushed temperatures well into the 20s; Scotts Peak Dam in the southwest highlands reached 26.8 °C on the 27th. The other side of this was some cold days in post-frontal southwesterlies, especially in the first week and again around the 12th, 16th and 29th.
Overall, maximum temperatures were below average in the west and north, typically by around half a degree but by over a degree in the western highlands, and above average by about half a degree in the east.

Many cold nights, but some mild: Most nights were colder than average, with the main exceptions being around the 11th, the 15th and the 26th to 29th. The morning of the 23rd was especially cold inland (Liawenee dipped to -6.3 °C), as winds eased and skies cleared behind a cold front. The mornings of the the 27th and 28th were particularly mild in strong pre-frontal winds.
Taken across the month, minimum temperatures were below average by about half a degree inland, but slightly above average on most of the coasts.

Many windy days: Strong and gusty westerly winds were common from the 1st to the 4th, from the 12th to 19th, and again from the 28th to the 31st. Numerous gusts in excess of 100 km/h were reported across the state, with the highest 148 km/h at Mount Wellington on the 4th. The strong winds coupled with low pressure to create abnormally high tides early in the month.

Further information

Ian Barnes-Keoghan
Tasmania and Antarctica Climate Services Centre
Bureau of Meteorology
Phone (03) 6221 2043
Email climate.tas@bom.gov.au

Extremes

Hottest day
Highest temperature
26.8 °C at Scotts Peak Dam on the 27th
Warmest days on average
Highest mean daily maximum temperature
18.6 °C at Swansea Post Office
Coolest days on average
Lowest mean daily maximum temperature
6.5 °C at Mount Read
Coldest day
Lowest daily maximum temperature
0.3 °C at Mount Wellington on the 16th
Coldest night
Lowest temperature
-6.3 °C at Liawenee on the 23rd
Coolest nights on average
Lowest mean daily minimum temperature
-0.4 °C at Mount Wellington
Warmest nights on average
Highest mean daily minimum temperature
10.0 °C at Swan Island
Warmest night
Highest daily minimum temperature
15.8 °C at Strahan Aerodrome on the 28th
Wettest overall
Highest total rainfall
515.0 mm at Mount Read
Driest overall
Lowest total rainfall
13.4 mm at Lewis Hill (St Pauls River)
Wettest day
Highest daily rainfall
104.6 mm at Mount Read on the 15th
Highest wind gust
148 km/h at Mount Wellington on the 4th

Records

Lowest total October rainfall for at least 20 years
Total rainfall
for October 2007 (mm)
Most recent lower
for October
Years since
lower
Normal for
October
Fingal (Legge Street) 17.2 5.3 in 1982 25 55.2
York Plains (Handroyd) 18.6 18.5 in 1982 25 55.3
Lewis Hill (St Pauls River) 13.4 1.8 in 1982 24 54.0
Nugent (Twilight Valley) 34.8 14.7 in 1982 24 67.3



Lowest October mean daily minimum temperature for at least 20 years
Mean daily minimum
temperature
for October 2007 (°C)
Most recent lower
for October
Years since
lower
Normal for
October
Orford (Aubin Court) 6.2 6.1 in 1976 31 7.2



Summaries

In this table, key sites have been highlighted to make them easier to find. This table is very wide and may not fit if printed.


Summary statistics for October 2007
Maximum temperatures
for October
(°C)
Minimum temperatures
for October
(°C)
Rainfall
for October
(millimetres)
Mean for
October
2007
Diff
from
normal
Highest for
October
2007
Mean for
October
2007
Diff
from
normal
Lowest for
October
2007
Total for
October
2007
Normal
for
October
Rank of
October
2007
Fraction of
October
normal
Northern (district 91)
Bridport 15.6 -0.9 19.1 23rd 7.8 -0.1 2.7 13th 29.5 64.1 low 46%
Burnie 15.7 -0.2 20.8 23rd 8.3 +0.4 3.4 8th 46.0 87.5 low 53%
Cape Grim BAPS 13.9 -0.3 18.4 21st 9.0 -0.2 6.4 18th 48.2 63.3 normal 76%
Cressy Research Station 17.4   24.4 25th 4.1   -3.2 8th 19.6
Devonport Airport 15.5 -0.1 21.2 22nd 6.7 -0.5 1.4 7th 43.6 66.4 low 66%
Launceston 17.5 -0.5 23.2 25th 6.6 -0.3 1.3 8th 21.2 53.4 low 40%
Launceston Airport 17.5   23.9 25th 4.5   -0.8 7th 16.2
Launceston Airport Comparison 16.7 +0.3 23.5 25th 5.0 -0.5 0.8 17th 18.4 60.9 very low 30%
Low Head 14.9 -0.4 17.2 28th 9.5 +0.1 5.2 17th 38.6 59.7 low 65%
Luncheon Hill 13.8 -0.8 22.0 25th 5.6 -0.4 1.0 17th 162.6 143.6 normal 113%
Marrawah 14.4 -0.5 19.5 21st 8.2 +0.1 4.8 10th 57.2 90.7 low 63%
Powranna 17.6 +0.6 24.5 25th 5.0 -0.4 0.6 8th 20.5 51.3 very low 40%
Scottsdale 15.7 -0.7 20.4 22nd 4.9 -0.9 0.0 7th 38.8 86.7 low 45%
Sheffield School Farm 14.8 -0.2 20.3 25th 5.3 -0.5 0.1 7th 53.4 86.7 normal 62%
Smithton Aerodrome 15.9 -0.3 21.1 25th 6.8 -0.2 0.9 17th 71.6 88.8 normal 81%
Wynyard Airport 15.9 -0.1 23.3 24th 5.6 -0.4 -0.5 17th 66.6 100.6 low 66%
East Coast (district 92)
Bicheno 18.0 +0.6 24.3 15th 9.5 +1.1 4.9 18th 37.6 56.2 normal 67%
Eddystone Point 17.0 +0.7 21.9 22nd 9.0 -0.1 4.0 7th 43.4 69.6 low 62%
Fingal 17.6 +0.2 25.5 20th 4.8 -0.1 -2.4 8th 17.2 55.2 very low 31%
Friendly Beaches 18.3 +0.5 24.7 14th 8.7 +0.1 3.6 7th 44.4 69.8 low 64%
Lake Leake 14.3 +0.6 21.1 25th 3.2 -0.4 -2.6 8th 40.2 76.5 low 53%
Maria Island 17.4   22.1 15th 9.1   5.0 13th 21.8
Orford 17.8 +0.4 23.4 15th 6.2 -0.9 0.6 8th 29.6 60.7 low 49%
Scamander 18.1 +0.7 26.0 20th 8.5 +0.5 2.0 2nd 60.1 65.4 normal 92%
St Helens Aerodrome 17.5   25.4 20th 8.2   2.5 7th 52.4
Swan Island 15.4   18.1 28th 10.0   5.6 17th 31.8
Swansea Post Office 18.6 +0.8 24.5 11th 8.0 +0.9 1.3 8th 23.6 53.8 low 44%
Midlands (district 93)
Ross 18.2 +1.4 25.2 25th 4.4 -0.6 -2.5 23rd 25.8 45.6 low 57%
Southeast (district 94)
Bull Bay 16.4 0.0 20.5 27th 7.2 -0.8 3.2 13th 39.2 57.0 low 69%
Campania 18.1   24.9 20th 6.8   0.2 8th 33.2
Cape Bruny 15.3 +0.1 21.1 27th 8.3 +0.1 5.0 8th 61.8 71.5 normal 86%
Cape Bruny Lighthouse 14.7 +0.3 20.6 28th 8.0 +0.1 2.8 5th 83.4 84.0 normal 99%
Dover 16.1 -0.1 23.2 28th 6.7 +0.3 1.2 18th 102.4 87.8 high 117%
Geeveston 16.1 -0.2 24.4 28th 6.5 +0.5 0.9 7th 127.0 93.9 high 135%
Grove 16.9 0.0 24.4 28th 5.7 +0.1 0.3 7th 70.6 70.0 normal 101%
Grove 16.8   23.6 28th 5.7   -0.3 7th 79.6
Hobart 17.4 +0.5 24.2 20th 8.3 +0.6 4.5 17th 45.4 62.1 normal 73%
Hobart Airport 18.0 +0.7 24.9 20th 7.7 +0.3 3.5 18th 28.4 47.6 low 60%
Maatsuyker Island Lighthouse 12.5 -0.8 23.5 27th 7.3 -0.1 4.2 7th 123.0 106.8 normal 115%
Melton Mowbray 16.2 -0.3 22.8 25th 6.0 +0.5 1.2 7th 41.8 45.7 normal 91%
Mount Wellington 6.9 0.0 14.8 25th -0.4 -0.4 -4.6 13th 35.2 79.8 low 44%
Tasman Island 13.6   18.6 20th 7.3   3.1 13th 42.2
Tunnack Fire Station 14.9 +0.7 21.9 25th 4.2 -0.2 -3.7 7th 38.6 58.8 low 66%
Derwent Valley (district 95)
Bushy Park 17.9 +0.2 25.1 28th 5.6 -0.2 -0.6 7th 52.2 57.9 normal 90%
Maydena Post Office 14.9 -0.7 24.2 28th 5.0 +0.3 -0.6 7th 164.9 131.2 normal 126%
Moogara 13.0 -0.3 20.5 25th 4.3 +0.2 0.0 8th 97.3 84.9 high 115%
Ouse Fire Station 17.4 -0.1 24.3 25th 5.4 +0.1 -0.6 18th 67.4 62.4 normal 108%
Tarraleah Village 13.4 0.0 20.9 28th 3.8 +0.6 0.0 7th 162.1 112.9 high 144%
Central Plateau (district 96)
Lake St Clair National Park 11.8 -0.8 20.3 25th 1.9 -0.1 -2.5 7th 296.0 188.3 very high 157%
Liawenee 11.0   21.0 25th 0.4   -6.3 23rd 76.8
West Coast (district 97)
Hartz Mountain 9.9 -0.8 19.5 25th 2.1 -0.4 -1.5 13th 115.2 96.1 normal 120%
Mount Read 6.5 -1.0 17.9 26th 0.9 -0.4 -2.4 17th 515.0 374.4 very high 138%
Scotts Peak Dam 13.6 -0.4 26.8 27th 4.8 -0.1 1.8 17th 233.2
Strahan Aerodrome 14.8 -1.2 26.5 27th 7.4 +0.2 2.2 18th 167.4 128.5 high 130%
Strathgordon Village 12.8 -0.6 24.2 27th 5.1 -0.3 1.0 18th 397.8 255.6 very high 156%
Warra 12.6   20.8 28th 4.3   0.8 13th 284.4
King Island (district 98)
King Island Airport 15.5 0.0 21.8 18th 9.1 +0.4 4.8 17th 59.0 76.2 normal 77%
Flinders Island (district 99)
Flinders Island Airport 16.6 -0.1 23.3 28th 9.4 +0.9 1.8 10th 42.6 61.4 normal 69%
Hogan Island 15.7   21.8 21st 9.9   6.5 4th 62.8
Macquarie Island (district 300)
Macquarie Island 6.0 +0.2 7.6 30th 1.9 -0.1 -1.7 22nd 85.2 75.5 normal 113%

Notes

This statement has been prepared based on information available at 11 am on Thursday 1 November 2007. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Normals 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 "normal" 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, normal in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of normal shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

Ian Barnes-Keoghan
Tasmania and Antarctica Climate Services Centre
Bureau of Meteorology
Phone (03) 6221 2043
Email climate.tas@bom.gov.au