Monday, 3 December 2007 - Seasonal Climate Summary for Tasmania - Product code IDCKGC27R0

Tasmania in spring 2007: dry in the east

Summary

Rainfall was below average in most areas of Tasmania during spring 2007, and very much below average in the east; only a very wet October kept the west close to average. Temperatures were above normal across the state.

Summaries are also available for the individual months of September, October and November 2007, as is an archive of the summaries for previous seasons. It is intended that the summaries for December and all of 2007 will be published on Wednesday 3 January 2008.

Details

Dry in the eastern half: A fairly wet September and a very wet October in the western half were balanced by a dry November, but the eastern half missed out on much of the rain throughout the three months. A few sites had their lowest total spring rainfall on record and several more had their lowest total spring rainfall since at least 1982.  The wettest spot for spring was Mount Read, with 928 mm (even though one day of rain in September was not reported); 515 of this fell during October including over 200 mm in just two days, whilst it could manage only 40 mm for all of November. At the other extreme, some sites in the east had less than 50 mm for the whole of spring.

Warm days predominate: A number of sites had either their highest spring mean daily maximum temperature on record; others (including Hobart and Burnie) had their warmest since 1987. Across the season, daytime temperatures were about a degree above average in most areas, and over a degree in the Midlands and near the Derwent Valley. There were some abnormally cool days during September, but there were lots of warm days as the season progressed: temperatures reached into the low 30s on several days in November.

Some cold nights, but mild on average: Cold nights were quite common during September and October, but much less frequent in November. Averaged over the whole season, minimum (overnight) temperatures were a little above average in most areas (with Bicheno managing a record), but just a little below average at some locations.

Some fronts, but some highs: There were persistent westerly winds through the last week of September and right through October, with many gusts in excess of 100 km/h. However, the first three weeks of September and most of November saw Tasmania's weather dominated by high pressure systems.

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
34.5 °C at Swansea Post Office on 20 Nov
Warmest days on average
Highest mean daily maximum temperature
19.2 °C at Bushy Park (Bushy Park Estates)
Coolest days on average
Lowest mean daily maximum temperature
8.3 °C at Mount Wellington
Coldest day
Lowest daily maximum temperature
-1.6 °C at Mount Wellington on 3 Sep
Coldest night
Lowest temperature
-6.3 °C at Liawenee on 4 Sep and 23 Oct
Coolest nights on average
Lowest mean daily minimum temperature
0.9 °C at Mount Wellington
Warmest nights on average
Highest mean daily minimum temperature
10.7 °C at Swan Island
Warmest night
Highest daily minimum temperature
19.6 °C at Flinders Island Airport on 20 Nov
Wettest overall
Highest total rainfall
> 928.0 mm at Mount Read
(one day missing)
Driest overall
Lowest total rainfall
40.2 mm at Tunbridge (Austin-Vale)
Wettest day
Highest daily rainfall
104.6 mm at Mount Read on 15 Oct
Highest wind gust
148 km/h at Mount Wellington on 4 Oct

Records


Record lowest total spring rainfall
Total rainfall
for spring 2007 (mm)
Previous lowest
for spring
Years of
record
Normal for
spring
York Plains (Handroyd) 58.0 70.0 in 1940 92 150.2
Orford (Aubin Court) 63.8 69.0 in 1982 55 175.5
Taroona (Taroona Crescent) 88.2 93.8 in 1981 41 170.4
Nugent (Twilight Valley) 102.0 119.4 in 2003 24 204.2


Lowest total spring rainfall for at least 20 years
Total rainfall
for spring 2007 (mm)
Most recent lower
for spring
Years since
lower
Normal for
spring
Premaydena Hatchery 111.4 94.1 in 1961 46 189.9
Hobart Airport 70.2 65.5 in 1963 44 131.7
Avoca (Railway House) 76.8 62.5 in 1967 39 149.2
Levendale 89.8 49.4 in 1940 39 195.2
Eaglehawk Neck (Jetty Road) 113.6 110.9 in 1981 26 209.7
Fingal (Legge Street) 75.0 38.3 in 1982 25 148.8
Swansea Post Office 50.0 28.8 in 1982 25 145.7
Lake Leake (Elizabeth River) 104.4 100.9 in 1982 24 209.0
Lewis Hill (St Pauls River) 61.4 40.0 in 1982 24 155.3
Copping 97.0 96.3 in 1982 22 194.5
Oatlands Post Office 70.8 57.8 in 1982 22 145.7




Record highest spring mean daily maximum temperature
Mean daily maximum
temperature
for spring 2007 (°C)
Previous highest
for spring
Years of
record
Normal for
spring
Launceston Airport Comparison 17.6 = 17.6 in 1987 69 16.4
Hobart Airport 18.4 18.3 in 1982 50 17.1
Eddystone Point 17.5 = 17.5 in 2005 49 16.2
Tarraleah Village 15.0 = 15.0 in 2000 25 13.6
Mount Wellington 8.3 8.2 in 2005 24 6.8


Highest spring mean daily maximum temperature for at least 20 years
Mean daily maximum
temperature
for spring 2007 (°C)
Most recent higher
for spring
Years since
higher
Normal for
spring
Bushy Park (Bushy Park Estates) 19.2 20.0 in 1950 52 17.6
Grove (Comparison) 17.9 18.0 in 1961 42 16.7
Orford (Aubin Court) 17.8 18.9 in 1982 25 17.2
Burnie (Round Hill) 16.7 17.0 in 1987 20 16.0
Hobart (Ellerslie Road) 17.9 18.0 in 1987 20 16.9
Launceston Airport Comparison 17.6 17.6 in 1987 20 16.4
Swansea Post Office 18.6 18.9 in 1987 20 17.6



Record highest spring mean daily minimum temperature
Mean daily minimum
temperature
for spring 2007 (°C)
Previous highest
for spring
Years of
record
Normal for
spring
Bicheno (Council Depot) 9.8 9.6 in 2000 32 8.5


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 spring 2007
Maximum temperatures
for spring
(°C)
Minimum temperatures
for spring
(°C)
Rainfall
for spring
(millimetres)
Mean for
spring
2007
Diff
from
normal
Highest for
spring
2007
Mean for
spring
2007
Diff
from
normal
Lowest for
spring
2007
Total for
spring
2007
Normal
for
spring
Rank of
spring
2007
Fraction of
spring
normal
Northern (district 91)
Bridport 16.5 +0.1 27.3 20 Nov     1.8 4 Sep 96.4 188.9 low 51%
Burnie 16.8 +0.8 27.3 12 Nov 9.4 +1.3 3.4 8 Oct 141.4 245.4 very low 58%
Cape Grim BAPS 15.0 +0.5 22.4 17 Nov 9.6 +0.2 4.1 4 Sep 151.0 186.9 normal 81%
Cressy Research Station 18.5   31.3 20 Nov 4.9   -3.2 8 Oct 83.4
Devonport Airport 16.4 +0.7 25.7 20 Nov 7.6 +0.3 0.1 4 Sep 121.1 198.7 low 61%
Launceston 18.6 +0.7 30.4 20 Nov 7.5 +0.6 -0.5 23 Sep 90.0 168.6 very low 53%
Launceston Airport 18.2   31.9 20 Nov 5.7   -2.2 22 Sep 84.2
Launceston Airport Comparison 17.6 +1.2 30.8 20 Nov 5.9 +0.3 -2.2 4 Sep 108.7 175.3 low 62%
Low Head 15.8 +0.3 25.8 28 Nov 9.9 +0.3 2.9 22 Sep 110.8
Luncheon Hill 15.3 +0.8 27.4 16 Nov 6.6 +0.4 0.6 4 Sep 370.6 415.9 normal 89%
Marrawah 15.5 +0.5 22.8 20 Nov 8.6 +0.4 1.5 4 Sep 182.4 265.7 very low 69%
Powranna 18.3 +1.3 32.0 20 Nov 5.8 +0.4 -2.6 4 Sep 84.3 175.2 very low 48%
Scottsdale 16.7 +0.3 30.5 20 Nov 6.1 0.0 -2.5 22 Sep 157.6 257.9 low 61%
Sheffield School Farm 15.9 +0.6 26.7 20 Nov 5.9 -0.1 -1.8 4 Sep 193.4
Smithton Aerodrome 17.0 +0.6 26.7 17 Nov 7.4 +0.2 -1.4 22 Sep 176.8 253.0 low 70%
Wynyard Airport 16.7 +0.8 27.2 20 Nov 6.6 +0.4 -0.9 4 Sep 195.8 264.3 low 74%
East Coast (district 92)
Bicheno 18.0 +0.8 25.2 20 Nov 9.8 +1.3 3.9 23 Sep 73.8 156.2 low 47%
Eddystone Point 17.5 +1.2 29.6 19 Nov 9.9 +0.6 2.7 22 Sep 113.2 191.8 low 59%
Fingal 18.0 +0.7 33.9 20 Nov 5.5 +0.5 -3.7 23 Sep 75.0 149.4 low 50%
Friendly Beaches 18.6 +0.6 27.8 20 Nov 9.0 +0.3 2.2 23 Sep 80.0
Lake Leake 14.4 +1.0 30.8 20 Nov 3.6 0.0 -4.9 23 Sep 104.4 209.9 very low 50%
Maria Island 17.3   26.4 19 Nov 9.8   5.0 13 Oct 56.4
Orford 17.8 +0.6 29.0 20 Nov 6.9 -0.4 -1.3 5 Sep 63.8 177.5 lowest 36%
Scamander 18.3 +0.8 33.0 20 Nov     2.0 2 Oct 109.6 179.7 low 61%
St Helens Aerodrome 17.9   31.7 19 Nov 8.8   1.7 23 Sep 98.0
Swan Island 16.0   24.7 20 Nov 10.7   4.6 22 Sep 104.2
Swansea Post Office 18.6 +1.1 34.5 20 Nov 8.1 +0.8 -1.5 23 Sep 50.0 146.5 very low 34%
Midlands (district 93)
Ross 18.8 +1.8 33.1 20 Nov 5.0 0.0 -3.7 22 Sep 72.8 142.4 very low 51%
Southeast (district 94)
Bull Bay 16.9 +0.6 28.0 20 Nov 7.7 -0.3 2.8 22 Sep 107.6 160.8 low 67%
Campania 19.0   32.8 20 Nov 7.0   -0.1 5 Sep 72.2
Cape Bruny 16.0 +0.7 26.8 20 Nov 8.6 +0.2 4.7 22 Sep 149.4
Cape Bruny Lighthouse 15.3 +0.9 25.7 20 Nov 8.7 +0.7 2.8 5 Oct 186.2 240.5 low 77%
Dover 16.6 +0.6 26.7 20 Nov 6.4 0.0 -0.8 5 Sep 192.4 240.5 low 80%
Geeveston 17.2 +0.8 30.2 20 Nov 6.4 +0.4 -1.7 5 Sep 235.4 254.0 normal 93%
Grove 17.9 +1.2 32.1 20 Nov 5.8 +0.2 -1.4 23 Sep 151.0 210.0 low 72%
Grove 17.8   32.5 20 Nov 5.2   -2.3 23 Sep 164.6
Hobart 17.9 +1.1 30.1 20 Nov 8.6 +0.8 2.8 5 Sep 113.8 169.0 low 67%
Hobart Airport 18.4 +1.3 33.7 20 Nov 8.2 +0.7 1.2 5 Sep 70.2 133.0 very low 53%
Maatsuyker Island Lighthouse 13.5 +0.2 23.5 27 Oct 8.3 +0.8 4.2 7 Oct 203.8 309.2 low 66%
Melton Mowbray 17.6 +0.7 32.3 20 Nov 5.9 +0.2 -0.9 5 Sep 101.0 132.2 normal 76%
Mount Wellington 8.3 +1.5 22.0 20 Nov 0.8 +0.7 -4.8 4 Sep 86.6 237.8 lowest 36%
Tasman Island 14.2   27.6 19 Nov 8.1   2.7 22 Sep 122.4
Tunnack Fire Station 15.7 +1.1 29.0 16 Nov 4.6 +0.1 -3.7 7 Oct 85.4
Derwent Valley (district 95)
Bushy Park 19.2 +1.6 33.5 19 Nov 5.6 -0.1 -3.0 5 Sep 125.6 164.8 low 76%
Maydena Post Office 16.4 +0.8 31.0 19 Nov 5.0 +0.2 -1.5 7 Sep 318.1 362.2 normal 88%
Moogara 14.5 +1.0 27.0 19 Nov 4.9 +0.6 0.0 8 Oct 194.9 248.7 low 78%
Ouse Fire Station 18.8 +0.8 33.5 19 Nov 5.1 -0.3 -4.2 23 Sep 140.6
Tarraleah Village 14.9 +1.4 29.2 19 Nov     -2.8 4 Sep 276.8 328.8 normal 84%
Central Plateau (district 96)
Lake St Clair National Park 13.8 +1.3 27.7 19 Nov 2.1 0.0 -4.4 4 Sep 545.8 535.5 normal 102%
Liawenee 12.4   25.6 19 Nov 1.2   -6.3 4 Sep 197.8
West Coast (district 97)
Hartz Mountain 12.0 +1.1 29.1 19 Nov 3.1 +0.3 -2.0 4 Sep 232.2
Mount Read 8.5 +0.8 20.2 19 Nov 1.9 +0.4 -4.0 4 Sep 928.0
Scotts Peak Dam 15.8   31.1 19 Nov 5.7   0.1 4 Sep 444.8
Strahan Aerodrome 16.3 +0.4 26.5 27 Oct 7.5 +0.3 -0.3 5 Sep 333.6 391.4 normal 85%
Strathgordon Village 14.5 +0.9 28.6 19 Nov 5.8 +0.2 -1.0 5 Sep 707.5 709.5 normal 100%
Warra 14.0   29.5 20 Nov 4.8   -1.8 4 Sep 526.6
King Island (district 98)
King Island Airport 16.5 +0.8 24.7 19 Nov 9.3 +0.4 1.1 22 Sep 162.6 222.4 low 73%
Flinders Island (district 99)
Flinders Island Airport 17.3 +0.6 30.7 20 Nov 9.4 +0.7 -1.2 23 Sep 99.6 181.6 very low 55%
Hogan Island 16.0   27.9 19 Nov 10.6   6.5 4 Oct 172.4

Notes

This statement has been prepared based on information available at 10 am on Monday 3 December 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