Thursday, 3 January - Monthly Climate Summary for Tasmania - Product code IDCKGC17R0

Tasmania in December 2007: very warm, some heavy rain

The last day of 2007 was hot across Tasmania, and served as a fitting end to another very warm month (and a warm year). December was also notable for several heavy rainfall events (including thunderstorms) that made it a rather wet month, at least in some parts of the state. A low pressure system close to the state on the 21st and 22nd brought statewide rain with some heavy falls, along with anomalously high tides.

A separate summary of the whole of 2007 has also been prepared.

Details

Wet in the northwest: Quite unlike the very dry November, much of Tasmania had average rain during December, and in some parts rainfall was above average. Wynyard had its highest total December rainfall on record whilst Cape Bruny and City of Melbourne Bay had their highest total December rainfall in over 20 years. The central East Coast, however, had below-average rain for the month, with several sites reporting less than 20 mm for the whole month.

Thunderstorms and heavy falls: One of the sources of rainfall during December was thunderstorms, with marked outbreaks around the 3rd, 7th and 20th bringing lightning, thunder and sometimes hail to many parts of the state. There were also some other heavy rainfalls: many sites in the northwest of the state had more than 50 mm (and several sites more than 70 mm) in the 24 hours to 9am on the 22nd. 

Warm days:  Temperatures into the high 30s on the 31st (with Strathgordon and Tarraleah having their hottest December day on record) rounded off  a very warm December. There were many other very warm days, in particular the 2nd, 20th, 28th and 29th when temperatures reached into the low 30s. There were very few especially cold days (the main exceptions being in the south and west on the 10th and 24th). As a result, a few sites had their highest December mean daily maximum temperature on record.  

Mild nights: Just as the days were warmer than normal, so were most of the nights. There were a few quite cool mornings, notably the 5th, 10th, 11th and 23rd to 26th, but these were more than balanced by many very mild nights. Several sites (including Burnie) had their highest December mean daily minimum temperature on record.

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
38.0°C at Ouse Fire Station on the 31st
Warmest days on average
Highest mean daily maximum temperature
24.2°C at Ouse Fire Station
Coolest days on average
Lowest mean daily maximum temperature
13.0°C at Mount Wellington
Coldest day
Lowest daily maximum temperature
3.4°C at Mount Read on the 24th
Coldest night
Lowest temperature
−1.4°C at Liawenee on the 11th
Coolest nights on average
Lowest mean daily minimum temperature
3.6°C at Mount Wellington
Warmest nights on average
Highest mean daily minimum temperature
14.3°C at Swan Island
Warmest night
Highest daily minimum temperature
19.1°C at Flinders Island Airport on the 7th
Wettest overall
Highest total rainfall
306.8 mm at Mount Read
Driest overall
Lowest total rainfall
14.2 mm at Swansea Post Office
Wettest day
Highest daily rainfall
76.0 mm at Erriba (Jubb Road) to 9am on the 22nd
Highest wind gust
120 km/h at Scotts Peak Dam on the 7th

Records

Record highest total December rainfall
Total rainfall
for December 2007 (mm)
Previous highest
for December
Years of
record
Normal for
December
Wynyard Airport 164.2 154.2 in 1993 36 64.2


Highest total December rainfall for at least 20 years
Total rainfall
for December 2007 (mm)
Most recent higher
for December
Years since
higher
Normal for
December
Cape Bruny Lighthouse 146.2 166.0 in 1985 22 77.2
City of Melbourne Bay 120.8 131.8 in 1986 21 59.6



Record highest December temperature
Highest temperature
in December 2007 (°C)
Previous highest
for December
Years of
record
Normal for
December
Strathgordon Village 35.0 on the 31st 33.9 on the 22nd in 1971 27 17.2
Tarraleah Village 35.1 on the 31st 32.6 on the 11th in 1998 25 17.7

Tarraleah's 35.1°C is the highest temperature recorded there in anymonth in its 26 years of reporting, surpassing the 35.0°C of 24 January 1982.


Record highest December mean daily maximum temperature
Mean daily maximum
temperature
for December 2007 (°C)
Previous highest
for December
Years of
record
Normal for
December
Eddystone Point 22.2 21.6 in 2002 49 19.3
Flinders Island Airport 22.8 22.0 in 2003 45 20.1

Highest December mean daily maximum temperature for at least 20 years
Mean daily maximum
temperature
for December 2007 (°C)
Most recent higher
for December
Years since
higher
Normal for
December
Maatsuyker Island Lighthouse 17.4 18.5 in 1973 34 15.7



Record highest December mean daily minimum temperature
Mean daily minimum
temperature
for December 2007 (°C)
Previous highest
for December
Years of
record
Normal for
December
Burnie (Round Hill) 13.1 13.0 in 1973 54 11.0
Flinders Island Airport 13.7 13.6 in 1985 45 11.7
Orford (Aubin Court) 12.2 12.1 in 1998 40 10.5
Marrawah 11.9 = 11.9 in 1985 37 10.5
Tarraleah Village 7.6 7.4 in 1985 25 6.1
Scamander 12.4 = 12.4 in 1985 24 11.3

Highest December mean daily minimum temperature for at least 20 years
Mean daily minimum
temperature
for December 2007 (°C)
Most recent higher
for December
Years since
higher
Normal for
December
Maatsuyker Island Lighthouse 11.2 11.4 in 1985 22 9.6
Marrawah 11.9 11.9 in 1985 22 10.5
Eddystone Point 13.4 13.7 in 1985 21 12.2



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 December 2007
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2007
Diff
from
normal
Highest for
December
2007
Mean for
December
2007
Diff
from
normal
Lowest for
December
2007
Total for
December
2007
Normal
for
December
Rank of
December
2007
Fraction of
December
normal
Northern (district 91)
Bridport 20.7 +0.6 27.8 29th 12.0 +0.9 5.6 6th 64.4 39.7 high 162%
Burnie 20.0 +0.6 24.4 29th 13.1 +2.1 8.2 23rd 129.4 65.1 very high 199%
Cape Grim BAPS 18.4 +1.2 22.1 28th 12.9 +1.1 9.3 5th 79.0 42.5 very high 186%
Cressy Research Station 23.9   31.5 29th 10.2   3.4 11th 69.6
Devonport Airport 20.4 +1.0 23.5 22nd 11.9 +1.5 6.7 5th 87.2 53.5 high 163%
Launceston 23.0 +0.6 29.3 31st 12.1 +1.5 6.5 5th 47.2 45.8 normal 103%
Launceston Airport 23.4   29.6 31st 10.0   3.8 5th 54.0
Launceston Airport Comparison 22.6 +1.4 28.8 31st 10.0 +1.3 4.4 5th 76.4 50.7 high 151%
Low Head 19.5 +0.7 23.6 22nd 13.8 +1.1 10.1 26th 53.8 43.8 normal 123%
Luncheon Hill 18.5 0.0 26.8 31st 9.8 +1.4 5.5 10th 109.4 92.2 high 119%
Marrawah 19.2 +1.0 24.0 28th 11.9 +1.3 8.2 5th 79.8 64.0 high 125%
Powranna 23.6 +1.2 30.7 31st 10.2 +1.5 3.6 11th 46.0 44.1 normal 104%
Scottsdale 21.7 +0.9 29.6 29th 9.9 +0.7 3.9 5th 59.6 67.8 normal 88%
Sheffield School Farm 19.5 −0.1 25.2 31st 9.8 +0.8 4.2 10th 139.8 61.8 high 226%
Smithton Aerodrome 20.1 +0.6 24.3 29th 11.0 +1.4 4.4 5th 85.4 58.2 high 147%
Wynyard Airport 19.8 +0.4 26.5 29th 11.2 +1.8 4.5 10th 164.2 64.2 highest 256%
East Coast (district 92)
Bicheno 21.8 +1.8 27.3 29th 12.5 +1.1 7.2 10th 19.2 68.7 low 28%
Eddystone Point 22.2 +2.9 32.0 29th 13.4 +1.2 7.8 25th 31.6 59.7 low 53%
Fingal 22.8 +1.3 35.6 31st 9.6 +1.0 2.5 11th 26.4 49.5 normal 53%
Friendly Beaches 23.1 +1.3 33.5 29th 12.7 +1.0 8.0 11th 15.8 36.6 low 43%
Lake Leake 18.8 +1.3 30.4 31st 7.8 +0.9 2.6 11th 40.4 73.1 low 55%
Maria Island 21.4   25.4 4th 13.0   9.3 11th
Orford 22.3 +2.0 28.0 28th 12.2 +1.7 7.2 10th 27.4 63.7 low 43%
Scamander 21.6 +1.3 32.5 29th 12.4 +1.2 7.2 26th 51.2 60.0 normal 85%
St Helens Aerodrome 21.9   31.3 29th 12.5   6.7 11th 40.8
Swan Island 20.3   25.9 31st 14.3   9.4 23rd 53.8
Swansea Post Office 22.6 +2.0 32.9 29th 12.1 +1.6 7.3 10th 14.2 59.9 very low 24%
Midlands (district 93)
Ross 23.7 +1.1 32.7 29th 9.6 +1.2 1.9 11th 32.6 38.3 normal 85%
Southeast (district 94)
Bull Bay 21.2 +1.4 30.0 28th 11.5 +0.9 6.0 10th 74.8 64.8 normal 115%
Campania 24.0   35.8 31st 10.6   5.3 11th 59.0
Cape Bruny 19.9 +1.9 28.9 20th 11.6 +1.0 5.4 25th 128.8 64.0 very high 201%
Cape Bruny Lighthouse 19.1 +2.2 27.6 20th 11.7 +1.4 4.2 25th 146.2 77.2 very high 189%
Dover 20.2 +1.3 28.1 28th 8.9 −0.1 4.9 11th 97.4 74.7 high 130%
Geeveston 21.7 +1.8 34.7 31st 9.1 +0.5 4.5 11th 104.2 73.5 high 142%
Grove 22.3 +2.1 36.2 31st 9.5 +0.9 3.7 16th 77.4 62.9 high 123%
Hobart 22.7 +2.5 33.4 31st 12.2 +1.4 8.5 10th 83.4 57.0 high 146%
Hobart Airport 22.8 +2.3 36.1 31st 11.7 +1.0 7.4 5th 67.2 54.1 high 124%
Maatsuyker Island Lighthouse 17.4 +1.7 27.8 31st 11.2 +1.6 6.4 25th 102.8 90.7 normal 113%
Melton Mowbray 23.0 +1.1 37.2 31st 9.8 +0.8 4.4 11th 67.4 38.4 normal 176%
Mount Wellington 13.0 +2.1 26.3 31st 3.6 +0.8 −1.1 10th 89.0 87.4 normal 102%
Tasman Island 17.6   25.6 31st 11.0   5.6 25th 96.2
Tunnack Fire Station 20.7 +1.1 30.8 29th 8.1 +0.7 1.2 11th 73.8 49.8 high 148%
Derwent Valley (district 95)
Bushy Park 23.8 +1.9 32.2 28th 9.4 +0.3 4.2 18th 60.2 50.9 high 118%
Maydena Post Office 21.2 +1.5 35.0 31st 8.3 +1.0 2.4 16th 88.0 89.1 normal 99%
Moogara 19.3 +1.8 32.0 31st 8.2 +1.3 4.0 11th 86.2 63.4 high 136%
Ouse Fire Station 24.2 +1.1 38.0 31st 9.4 +0.8 4.1 11th
Tarraleah Village 19.8 +2.1 35.1 31st 7.6 +1.5 1.9 26th 85.1 91.9 normal 93%
Central Plateau (district 96)
Lake St Clair National Park 18.5 +1.2 32.6 31st 6.3 +1.3 0.4 26th 111.8 134.3 normal 83%
Liawenee 16.7   31.2 31st 4.9   −1.4 11th 116.6
West Coast (district 97)
Hartz Mountain 16.5 +1.7 34.0 31st 6.1 +1.0 0.3 25th 101.4 79.4 high 128%
Mount Read 13.1 +1.4 27.0 31st 4.7 +0.9 0.0 25th 306.8
Scotts Peak Dam 20.7 +2.6 36.3 31st 9.1 +1.2 4.6 24th 134.2
Strahan Aerodrome 20.8 +1.0 36.7 31st 10.8 +1.2 6.3 30th 129.8 92.3 high 141%
Strathgordon Village 19.3 +2.1 35.0 31st 9.5 +1.2 5.5 25th 193.0 200.7 normal 96%
Warra 18.5   34.1 31st 7.7   3.1 17th 162.0
King Island (district 98)
King Island Airport 20.4 +1.9 29.3 2nd 12.6 +1.8 7.3 16th 107.0 50.3 very high 213%
Flinders Island (district 99)
Flinders Island Airport 22.8 +2.7 32.9 31st 13.7 +2.0 7.1 12th 26.2 56.8 low 46%
Hogan Island 20.7   30.1 31st 14.1   11.0 23rd 47.4
Macquarie Island (district 300)
Macquarie Island 8.4 +0.6 10.3 15th 5.0 +0.7 1.9 1st 78.6 77.3 normal 102%

Notes

This statement has been prepared based on information available at 10 am on Thursday 3 January 2008. 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