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

Tasmania in January 2007
Wet and warm

Summary

A sudden downpour affected the southeast on the 21st, giving Hobart one of its wettest Januaries on record and making the southeast one of the wettest parts of the state for the month. Rainfall was average or above across most of Tasmania, except for parts of the northeast. It was mostly warmer than normal, although the final week was fairly cool and windy.

Details

A month of good rains: In contrast to December, and indeed most of 2006, January brought plentiful rains to most areas of the state, the only exception being Flinders Island and the Tamar and Fingal Valleys (including Launceston and Bicheno), which had below-average rainfall for the month. Moderate to heavy rains fell during the first and third weeks, from a combination of vigorous cold fronts, low pressure systems centred over the state and a few thunderstorms. Northern sites received about 50 to 80 mm, most of the east received at least 30 mm, much of the southeast had over 100 mm and there were totals over 200 mm in the western highlands. Premaydena (on the Tasman Peninsula) had its wettest January on record, whilst Hobart, Cape Sorell and Strathgordon had their wettest January rainfall for many years - since 1924 in the case of Hobart. Meanwhile, Fingal had its lowest total January rainfall since 1980.

Very heavy rainfall event: Thunderstorms moved across parts of southeastern Tasmania on the afternoon of the 21st, dumping very heavy rain over a short period. In Hobart, over 25 mm fell in the 30 minutes from 3 pm, with a further 40 mm falling up to 8 pm. Rainfall this intense only occurs very rarely in Hobart - about once every fifty years on average. There was 96 mm recorded at Glenorchy and 54 mm at Tasman Island, but the storms were localised: the same day brought only 6 mm to New Norfolk and 4 mm to Huonville.

Warm to hot days: A few warm to hot days in the first half of the month ensured that daytime temperatures were above average. Particularly hot days occurred on the 4th and 5th, the 11th and 12th, the 14th to the 17th and the 21st, when several sites recorded temperatures into the  30s. The month ended with a week of cooler temperatures and strong, gusty winds.

Some warm nights: There were many warm nights in January, especially during the first and third weeks of the month, although temperatures dropped toward the end of the month. Overnight temperatures were about 1°C to 1.5°C above average inland and on the northwest coast, while it was slightly cooler on the other coasts. Geeveston and Wynyard had their warmest January night on record, whilst Flinders Island Airport and Scamander had their highest January mean daily minimum temperature on record. A cool period near the end of the month saw Scottsdale have its lowest January temperature on record on the morning of the 29th.

Further information

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

Extremes


Hottest day
Highest temperature
35.5°C at Ouse Fire Station on the 16th
Warmest days on average
Highest mean daily maximum temperature
25.6°C at Launceston Airport
Coolest days on average
Lowest mean daily maximum temperature
13.9°C at Mount Read
Coldest day
Lowest daily maximum temperature
3.2°C at Mount Wellington on the 27th
Coldest night
Lowest temperature
−1.6°C at Mount Wellington on the 27th
and Liawenee on the 28th
Coolest nights on average
Lowest mean daily minimum temperature
5.5°C at Mount Wellington
Warmest nights on average
Highest mean daily minimum temperature
15.2°C at Flinders Island Airport
Warmest night
Highest daily minimum temperature
20.5°C at Flinders Island Airport on the 17th
Wettest overall
Highest total rainfall
343.4 mm at Mount Read
Driest overall
Lowest total rainfall
14.0 mm at Fingal (Legge Street)
Wettest day
Highest daily rainfall
96.0 mm at Glenorchy (Glenorchy Reservoir) on the 22nd
Highest wind gust
131 km/h at Mount Wellington on the 30th

Records


Record highest total January rainfall
Total rainfall
for January 2007 (mm)
Previous highest
for January
Years of
record
Normal for
January
Premaydena Hatchery 147.6 145.2 in 1975 101 52.6


Highest total January rainfall for at least 20 years
Total rainfall
for January 2007 (mm)
Most recent higher
for January
Years since
higher
Normal for
January
Hobart (Ellerslie Road) 124.4 138.3 in 1924 83 48.3
Cape Sorell 130.2 163.8 in 1937 45 70.8
Strathgordon Village 283.6 480.3 in 1987 20 153.8



Lowest total January rainfall for at least 20 years
Total rainfall
for January 2007 (mm)
Most recent lower
for January
Years since
lower
Normal for
January
Fingal (Legge Street) 14.0 13.8 in 1980 27 44.4



Record highest January mean daily minimum temperature
Mean daily minimum
temperature
for January 2007 (°C)
Previous highest
for January
Years of
record
Normal for
January
Flinders Island Airport 15.2 15.0 in 1974 44 13.2
Scamander 13.7 = 13.7 in 1988 22 12.5



Record highest January daily minimum temperature
Highest daily minimum
temperature
in January 2007 (°C)
Previous highest
for January
Years of
record
Normal for
January
Geeveston (Cemetery Road) 18.5 on the 17th 18.1 on the 26th in 2005 21 9.7
Wynyard Airport 19.1 on the 17th = 19.1 on the 14th in 1998 21 10.9



Record lowest January temperature
Lowest temperature
in January 2007 (°C)
Previous lowest
for January
Years of
record
Normal for
January
Scottsdale (West Minstone Road) 2.8 on the 29th 2.9 on the 13th in 1983 35 10.7


Summaries

 In the following table, certain key sites have been highlighted to make them easier to identify.


Summary statistics for January 2007
Maximum temperatures
for January
(°C)
Minimum temperatures
for January
(°C)
Rainfall
for January
(millimetres)
Mean for
January
2007
Diff
from
normal
Highest for
January
2007
Mean for
January
2007
Diff
from
normal
Lowest for
January
2007
Total for
January
2007
Normal
for
January
Rank of
January
2007
Fraction of
January
normal
Northern (district 91)
Bridport 22.0 +0.3 27.4 5th 13.4 +0.3 7.1 31st 41.8 62.1 normal 67%
Burnie 21.3 +0.3 27.9 14th 14.1 +1.6 8.5 27th 52.2 43.8 normal 119%
Cape Grim BAPS 19.1 +0.4 23.9 16th 13.8 +0.9 9.5 27th 49.4 37.1 high 133%
Cressy Research Station 25.4 33.8 16th 11.5 6.3 31st 55.4
Devonport Airport 21.9 +1.0 27.9 14th 13.3 +1.2 7.2 31st 44.6 43.7 normal 102%
Launceston 25.2 +1.2 33.7 16th 13.0 +0.9 5.1 31st 31.4 48.9 low 64%
Launceston Airport 25.6 34.8 17th 11.0 3.5 31st 36.6
Launceston Airport Comparison 24.7 +1.6 33.6 17th 11.1 +0.9 4.4 31st 38.6 44.9 normal 86%
Low Head 20.2 +0.1 23.4 16th 14.7 +0.6 10.4 27th 39.2 57.6 low 68%
Marrawah 20.1 +0.1 27.5 16th 13.2 +1.4 8.5 27th 65.8 49.0 high 134%
Powranna 25.2 +1.3 34.0 17th 11.2 +0.7 6.0 31st 39.4 60.4 normal 65%
Scottsdale 23.5 +0.8 31.3 17th 12.0 +1.3 2.8 29th 42.0 60.7 normal 69%
Sheffield School Farm 22.2 +0.7 28.5 17th 11.3 +0.6 5.9 27th 70.2 60.1 high 117%
Smithton Aerodrome 21.2 −0.2 26.9 17th 12.6 +1.3 4.5 25th 45.4 42.4 normal 107%
Wynyard Airport 21.8 +0.9 30.2 17th 12.6 +1.7 5.6 31st 53.8 42.2 high 127%
East Coast (district 92)
Bicheno 22.9 +1.7 33.1 5th 13.4 +0.7 8.9 31st 22.0 53.3 low 41%
Eddystone Point 22.7 +2.0 33.0 5th 14.2 +0.7 8.2 31st 39.8 45.8 normal 87%
Fingal 24.0 +0.9 32.5 11th 11.0 +0.8 4.2 29th 14.0 44.4 low 32%
Friendly Beaches 23.6 +1.1 35.0 5th 13.3 +0.3 8.3 9th 46.2
Lake Leake 20.1 +1.2 29.7 17th 9.1 +0.9 1.8 10th 39.0 55.6 normal 70%
Maria Island 21.7 27.9 5th 13.5 9.5 9th 52.6
Orford 22.4 +0.5 33.0 11th 12.5 +0.8 7.6 9th 53.6 50.8 normal 106%
Scamander 22.6 +0.8 32.7 11th 13.7 +1.3 7.8 29th 38.2 48.3 normal 79%
St Helens Aerodrome 22.8 31.8 11th 13.4 6.7 31st 36.8
Swan Island 20.6 25.8 11th 15.0 10.2 29th 27.0
Swansea Post Office 23.1 +0.9 35.0 11th 12.7 +1.1 6.8 5th 35.6 50.0 normal 71%
Midlands (district 93)
Ross 25.4 +1.6 34.4 16th 11.4 +1.0 4.7 9th 44.4 55.0 normal 81%
Southeast (district 94)
Campania 24.6 32.5 17th 12.4 5.1 9th 83.0
Cape Bruny 20.4 +1.0 28.9 4th 12.2 +0.1 6.7 28th 105.4
Cape Bruny Lighthouse 19.7 +1.5 27.5 4th 12.7 +1.3 7.0 27th 128.8 62.6 very high 206%
Dover 20.7 +0.2 28.1 11th 11.0 +0.9 3.5 9th 101.5 55.8 high 182%
Geeveston 21.8 +0.3 33.0 4th 10.8 +1.1 3.0 9th 126.4 59.0 very high 214%
Grove Comparison 23.2 +1.0 33.2 4th 10.5 +1.1 4.0 9th 66.8 48.0 high 139%
Grove 23.2 33.2 4th 10.1 3.4 9th 71.0
Hobart 22.9 +1.3 33.0 11th 12.9 +1.1 7.5 9th 124.4 48.3 very high 258%
Hobart Airport 23.5 +1.1 32.6 4th 12.7 +0.8 7.2 9th 92.6 42.4 very high 218%
Maatsuyker Island Lighthouse 17.4 +0.3 29.6 16th 11.7 +1.1 6.8 27th 131.8 80.4 very high 164%
Melton Mowbray 24.1 +0.5 34.9 16th 11.2 +1.2 5.0 9th 57.2 33.7 high 170%
Mount Wellington 14.4 +1.4 25.3 17th 5.5 +0.9 −1.6 27th 119.6 88.2 normal 136%
Tasman Island 18.3 25.8 5th 11.1 5.0 27th 143.6
Tunnack Fire Station 21.3 0 31.0 17th 9.5 +0.9 1.1 9th 72.2 52.4 normal 138%
Derwent Valley (district 95)
Bushy Park 24.7 +0.9 34.5 17th 11.1 +1.1 5.9 27th 42.8 41.1 normal 104%
Maydena Post Office 21.8 −0.3 33.5 16th 10.1 +1.2 3.4 25th 88.2 65.9 high 134%
Moogara 20.7 +1.3 29.8 4th 9.1 +0.8 2.8 27th 72.4 52.9 normal 137%
Ouse Fire Station 25.3 35.5 16th 11.3 5.6 10th 57.6
Tarraleah Village 20.5 +1.3 32.2 16th 7.9 +0.9 2.6 27th 109.2 70.9 high 154%
Central Plateau (district 96)
Lake St Clair National Park 19.3 +0.1 30.5 16th 7.6 +1.3 0.6 25th 165.2 109.9 high 150%
Liawenee 19.1 28.7 17th 6.0 −1.6 28th 49.2
West Coast (district 97)
Hartz Mountain 17.3 −0.6 30.1 4th 7.4 +0.2 0.3 27th 136.4 72.6 high 188%
Mount Read 13.9 −0.4 27.2 16th 6.2 +0.4 −0.6 27th 343.4 209.0 high 164%
Scotts Peak Dam 20.4 33.9 16th 10.0 4.0 27th 208.4
Strahan Aerodrome 21.0 +0.5 31.3 4th 12.1 +1.5 7.2 9th 165.6 92.4 very high 179%
Strathgordon Village 20.0 +0.7 30.5 16th 10.3 +0.8 5.2 27th 283.6 153.8 very high 184%
Warra 19.3 30.6 17th 9.1 3.3 27th 168.6
King Island (district 98)
King Island Airport 20.1 −0.5 28.6 5th 13.4 +1.1 7.0 9th 57.0 37.7 high 151%
Flinders Island (district 99)
Flinders Island Airport 22.9 +1.0 33.2 5th 15.2 +2.0 7.1 15th 20.4 46.7 low 44%
Hogan Island 21.8 32.9 5th 14.9 10.9 27th 19.6
Macquarie Island (district 300)
Macquarie Island 8.9 +0.2 12.2 31st 5.2 −0.1 2.0 6th 102.2 83.9 high 122%

Notes

This statement has been prepared based on information available at 11am on Thursday 1 February 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. For rainfall, it is sometimes preferable to use the median rather than the mean to indicate "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 or Tom Delfatti
Tasmania and Antarctica Climate Services Centre
Bureau of Meteorology
Phone (03) 6221 2043
Email climate.tas@bom.gov.au