Tasmania in July 2010: Record warm days, record dry in the southeast

Cold fronts affecting Tasmania in July were mostly weak so that it was drier and warmer than normal, especially in the southeast where several records were broken. There were no very cold days, but several very cold nights. Rainfall was mostly confined to the north, west and far south.

  • Warmest July days on average for Tasmania
  • Record dry in the southeast
  • Very little snow

Warm winter days

July was notable for its lack of particularly cold days, especially in the southeast. As a result, average daytime temperatures were mostly one to two degrees warmer than usual in the southeast and around a degree warmer than usual elsewhere. Some sites, including Hobart and Bushy Park, had their warmest July mean maximum temperature on record

The highest temperature for the month was 18.4 °C at Bicheno on the 12th — a day when north to northwesterly winds blew over the state ahead of a cold front. Most sites reached at least 15 °C on this day, and some had their warmest July day in around five years. It was also warm on the 11th, 13th, 22nd, 26-27th and 30-31st. Even on the coldest day of the month all sites in the state (including Mount Wellington) managed to exceed 0 °C. This hasn't happened in July for over 20 years.

Despite it being generally warm, the central north and Midlands did have a few very cold days at the start of the month. Fog persisted well into the afternoon on the 2nd and Ross struggled to reach 4.0 °C, its coldest day in over 15 years. On the same day, Launceston had its coldest day since July 2007, reaching only 7.8 °C, and Cressy had its coldest July day since 1999, reaching just 5.5 °C. Cressy was only slightly warmer on the 5th, when its maximum temperature was 5.6 °C.

Continuing cold nights

Cold and frosty nights were much more common than mild ones. The overall pattern was similar to June: average overnight temperatures in the east were mostly cooler than usual while nights in the west were warmer than usual, typically around a degree. The southern Midlands and inland parts of the east were especially cold, with mean minima around two degrees below average. The southwest was the warmest compared to usual, with Maatsuyker Island equalling its highest July mean daily minimum temperature on record.

Very cold nights were common. Ross, for example, had 9 nights when the temperature fell to -3 °C or less — usually this occurs just 3 times in July. Fingal had only 10 nights when the temperature did not fall below 0 °C. But it was Liawenee that had the coldest nights on average (-1.5 °C), as well as the coldest overnight temperature (-7.9 °C on the 25th).

The windiest mornings were the mildest, namely the 11-12th in the north and 27th in the south. Swan Island had the warmest night, not falling below 12.6 °C in the 24 hours to 9 am on the 12th. Several other sites had double-digit minima on this day.

Still dry in the southeast

Very little rain fell in the southeast during July. Several sites, including Taroona and Huonville, had their driest July on record or their driest July in many years after receiving only 5 to 10 mm for the month. Hobart Airport was the driest location with a total of just 4.0 mm. Most other areas were also drier than usual, with the only a few spots in the northeast and central west having near normal rainfall.

Between the 10th and 14th three cold fronts crossed the state, bringing the best rain of the month. The wettest single day was the 11th when several sites had over 50 mm, including Western Creek (58 mm), Mole Creek (57 mm) and Mount Barrow (56 mm). Widespread falls of 30 to 50 mm in the Mount Arthur - Mount Barrow area caused minor flooding in the North Esk River. The following day, Mount Read (in the western highlands) received 56 mm as showers persisted. Then on the 14th minor flooding developed in the South Esk River after a further 25 to 35 mm fell in the northeast overnight. The best snowfalls for the month followed, but only descended to around the 700 metre level.

Hobart — mild, dry and sunny 

As with most of the southeast, Hobart was warm by day and very dry. Only 5.8 mm of rain fell for the whole month, making it the driest July since 1950 (and the second driest July in 129 years of record). It has also been the warmest and driest January-to-July period on record, with just 141 mm falling for the year so far after below-average rainfall in every month.

Dry conditions and more sun than usual combined to make days warmer than ever before (records began in 1882, with compatible instruments installed in 1895). Hobart's average maximum temperature was 13.9 °C, which is over two degrees warmer than usual. Days were not especially warm (the highest temperature of 16.4 °C was about normal), but the lack of cold was remarkable: the coldest day reached 11.6 °C whereas typically half the month is at least that cold. 

Overnight temperatures in Hobart were just slightly warmer than usual, with an average minimum of 5.0 °C. The coldest temperature was 1.2 °C early on the 9th, and the warmest night was 10.6 °C on the 12th — the warmest July night since 2005.

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Extremes in July 2010
Hottest day 18.4 °C at Bicheno (Council Depot) on the 12th
Warmest days on average 15.5 °C at Bicheno (Council Depot)
Coolest days on average 3.8 °C at Mount Wellington
Coldest day 0.2 °C at Mount Wellington on the 15th
Coldest night -7.9 °C at Liawenee on the 25th
Coolest nights on average -1.5 °C at Liawenee
Warmest nights on average 9.5 °C at Hogan Island
Warmest night 12.6 °C at Swan Island on the 12th
Warmest on average overall 11.4 °C at Hogan Island
Coolest on average overall 1.6 °C at Mount Wellington
Wettest overall 384.4 mm at Mount Read
Driest overall 4.0 mm at Hobart Airport
Wettest day 58.0 mm at Western Creek (Somer Hill) on the 11th
Highest wind gust 119 km/h at Mount Wellington on the 12th

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 total July rainfall

Total rainfall
for July 2010 (mm)
Previous driest
for July
Years of
record
Average for
July
Hobart Airport 4.0 8.6 in 1979 53 43.2
Taroona (Taroona Crescent) 9.0 12.6 in 1965 47 53.1
Huonville (Tutton Avenue) 16.8 24.2 in 1973 41 72.6
Rotherwood 13.2 22.5 in 1976 39 49.8
Nugent (Twilight Valley) 14.6 27.2 in 1994 28 78.0
Bull Bay (Lauriston) 8.8 25.6 in 1997 27 53.9
Tea Tree (The Point) 7.0 12.4 in 1997 25 42.1

Lowest total July rainfall for at least 20 years

Total rainfall
for July 2010 (mm)
Most recent July
at least this dry
Years since
drier
Average for
July
Eaglehawk Neck (Jetty Road) 25.4 11.7 in 1924 78 88.3
Bushy Park (Bushy Park Estates) 9.2 7.2 in 1933 76 49.1
Lunawanna 33.6 33.5 in 1944 63 84.9
Hobart (Ellerslie Road) 5.8 4.4 in 1950 60 52.0
Tarraleah Village 48.0 24.4 in 1957 53 116.0
Levendale 17.0 12.9 in 1940 43 60.9
Fort Direction 10.0 8.6 in 1965 38 44.6
Lake Leake (Elizabeth River) 27.0 24.6 in 1979 31 77.7
Hastings Chalet 71.2 =71.2 in 1979 28 143.4
Risdon Vale (Poplar Road) 7.0 6.3 in 1965 25 42.0



Record highest July temperature

Highest temperature
in July 2010 (°C)
Previous warmest
for July
Years of
record
Average for
July
Macquarie Island 8.3 on the 14th = 8.3 on the 20th in 1973 63 4.9



Record highest July mean daily maximum temperature

Mean daily maximum
temperature
for July 2010 (°C)
Previous warmest
for July
Years of
record
Average for
July
Hobart (Ellerslie Road) 13.9 13.7 in 2002 128 11.7
Bushy Park (Bushy Park Estates) 13.7 = 13.7 in 2005 73 11.1
Hobart Airport 14.5 14.3 in 2002 52 12.4
Bicheno (Council Depot) 15.5 = 15.5 in 1988 35 14.0
Mount Wellington 3.8 3.7 in 1999 29 2.3
Tarraleah Village 9.5 9.4 in 2002 27 8.2
Wynyard Airport 13.8 = 13.8 in 2005 23 12.6

Highest July mean daily maximum temperature for at least 20 years

Mean daily maximum
temperature
for July 2010 (°C)
Most recent July
at least this warm
Years since
warmer
Average for
July
Butlers Gorge 8.6 9.1 in 1950 42 6.9



Record highest July mean daily minimum temperature

Mean daily minimum
temperature
for July 2010 (°C)
Previous warmest
for July
Years of
record
Average for
July
Maatsuyker Island Lighthouse 8.1 = 8.1 in 2001 74 6.6




Summary statistics for July 2010

Maximum temperatures
for July
(°C)
Minimum temperatures
for July
(°C)
Rainfall
for July
(millimetres)
Mean for
July
2010
Diff
from
average
Highest for
July
2010
Mean for
July
2010
Diff
from
average
Lowest for
July
2010
Total for
July
2010
Average
for
July
Rank of
July
2010
Fraction of
July
average
Northern (district 91)
Bridport (Sea View Villas) 13.7 +0.5 16.1 27th 5.4 0.0 2.0 16th 73.8 76.6 average 96%
Burnie (Round Hill) 13.7 +1.0 15.8 27th 6.9 +1.0 3.5 19th 80.4 123.9 low 65%
Cape Grim BAPS 13.3 +0.8 15.0 12th 8.6 +0.4 5.6 8th 78.4 102.2 average 77%
Cressy Research Station 11.9 0.0 15.8 22nd 0.6 -0.9 -3.8 25th 47.4 60.7 average 78%
Devonport Airport 13.4 +0.7 15.4 23rd 4.3 -0.3 0.0 25th 63.2 96.0 low 66%
Launceston (Ti Tree Bend) 13.3 +0.8 16.8 22nd 2.3 +0.1 -1.3 8th 75.0 76.8 average 98%
Launceston Airport 12.0   16.3 22nd 1.5   -2.9 5th 47.2


Low Head 13.1 +0.4 14.6 12th 6.0 -0.9 3.0 19th 83.6 72.2 average 116%
Luncheon Hill (Forestry) 11.3 +0.7 13.6 13th 5.6 +0.7 1.6 19th 148.6 185.1 low 80%
Marrawah 13.1 +0.8 15.1 12th 7.5 +0.8 4.0 19th 114.6 139.4 average 82%
Scottsdale (West Minstone Road) 12.5 +0.5 15.3 22nd 3.9 +0.2 0.1 5th 96.8 119.1 average 81%
Sheffield School Farm 11.5 +0.7 15.1 22nd 3.2 -0.1 -0.6 16th 105.2 120.0 average 88%
Smithton Aerodrome 13.8 +0.7 16.2 12th 3.5 -1.1 -2.0 8th 71.0 112.4 v low 63%
Wynyard Airport 13.8 +1.2 16.5 22nd 3.0 -0.4 -1.0 19th 87.0 131.7 low 66%
East Coast (district 92)
Bicheno (Council Depot) 15.5 +1.5 18.4 12th 6.5 +0.4 3.3 7th 37.0 52.8 average 70%
Eddystone Point 14.8 +1.7 16.9 29th 7.6 +0.6 4.3 16th 46.2 76.2 low 61%
Fingal (Legge Street) 13.0 +0.9 16.4 22nd -0.1 -0.6 -4.2 16th 36.4 55.6 average 65%
Friendly Beaches 14.6 +0.9 17.1 31st 5.4 -0.3 1.2 9th 33.2 44.8 average 74%
Lake Leake (Elizabeth River) 9.5 +1.0 12.8 22nd -0.9 -1.1 -4.9 9th 27.0 77.7 v low 35%
Maria Island (Point Lesueur) 13.8   16.7 12th 7.6   4.9 19th 14.2


Orford (Aubin Court) 13.7 +0.7 16.8 12th 3.5 0.0 -0.5 9th 12.7 57.8 v low 22%
Scamander 14.9 +1.1 17.8 26th 4.8 +0.4 2.0 16th 75.6 56.5 high 134%
St Helens Aerodrome 14.4   16.4 26th 4.4   1.2 16th 66.8 51.3 average 130%
Swan Island 13.7   15.6 22nd 8.3   4.9 16th 35.6


Swansea Post Office 14.4 +1.1 17.6 12th 1.5 -2.1 -2.5 3rd 29.9 47.6 average 63%
Midlands (district 93)
Ross (The Boulevards) 11.9 +0.7 15.9 22nd 0.0 -1.5 -5.5 9th 22.4 40.0 v low 56%
Southeast (district 94)
Bull Bay (Lauriston) 13.6 +1.2 18.0 12th 6.2 +0.4 3.2 19th 8.8 53.9 lowest 16%
Campania (Kincora) 14.7 +1.7 17.6 11th 1.5 -1.9 -2.7 9th 5.2 33.3 v low 16%
Cape Bruny (Cape Bruny) 12.8 +0.8 15.3 12th 7.0 +0.4 4.2 25th 36.4 72.1 v low 50%
Cape Bruny Lighthouse 12.5 +1.3 15.1 12th 7.0 +0.9 4.4 25th 50.2 95.4 v low 53%
Dover 13.2 +0.9 16.4 30th 2.6 -1.0 -0.7 9th 37.4 85.2 v low 44%
Geeveston (Cemetery Road) 13.2 +1.2 15.7 22nd 1.6 -0.6 -2.4 9th 54.4 90.1 low 60%
Grove (Research Station) 13.8   16.7 12th 0.8   -4.0 8th 15.4


Hobart (Ellerslie Road) 13.9 +2.2 16.4 11th 5.0 +0.5 1.2 9th 5.8 52.0 v low 11%
Hobart Airport 14.5 +2.1 17.6 26th 3.8 -0.3 -0.8 10th 4.0 43.2 lowest 9%
Maatsuyker Island Lighthouse 11.4 +0.4 14.4 30th 8.1 +1.5 5.4 19th 95.6 128.9 low 74%
Melton Mowbray (North Stockman) 12.9 +1.6 15.9 17th 0.1 -2.1 -5.7 25th 7.6 29.3 v low 26%
Mount Wellington 3.8 +1.5 7.3 22nd -0.5 +1.1 -4.1 19th 27.8 72.1 v low 39%
Tasman Island 11.5   15.3 12th 7.4   3.9 15th 34.2


Tunnack Fire Station 10.8 +1.4 13.9 31st 0.0 -1.8 -4.8 9th



Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 13.7 +2.6 17.4 22nd 0.4 -1.1 -3.0 23rd 9.2 49.1 v low 19%
Maydena Post Office 11.4 +0.8 15.0 17th 2.5 +0.3 -1.4 2nd 56.3 104.7 v low 54%
Ouse Fire Station 13.0 +1.4 16.8 22nd -0.4 -1.6 -4.4 9th 10.4 45.4 v low 23%
Tarraleah Village 9.5 +1.3 12.5 31st 1.5 +1.1 -3.4 9th 48.0 116.0 v low 41%
Central Plateau (district 96)
Butlers Gorge 8.6 +1.7 11.8 30th 0.6 +1.0 -6.2 2nd 88.8 174.3 v low 51%
Lake St Clair National Park 8.1 +0.8 11.4 30th 0.2 +0.3 -4.7 2nd 128.8 199.8 low 64%
Liawenee 6.7   11.0 22nd -1.5   -7.9 25th 78.8


West Coast (district 97)
Hartz Mountain (Keoghs Pimple) 6.5 +0.5 11.6 30th 2.2 +0.9 -0.6 19th 75.0 94.1 low 80%
Mount Read 4.0 +0.4 5.6 30th 0.8 +0.7 -2.1 19th 384.4 393.9 average 98%
Scotts Peak Dam 10.1 +0.9 13.7 29th 4.3 +1.2 0.4 9th 175.8 191.0 average 92%
Strahan Aerodrome 12.8 +0.6 15.5 30th 5.5 +0.5 0.5 1st 194.8 164.1 high 119%
Strathgordon Village 10.0 +1.1 13.7 13th 4.2 +1.2 0.7 10th 200.6 269.3 low 74%
Warra 9.4   11.9 17th 3.3   -0.2 9th 107.4


King Island (district 98)
King Island Airport 14.0 +0.8 15.7 13th 7.3 -0.2 2.5 8th 83.6 113.5 low 74%
Flinders Island (district 99)
Flinders Island Airport 14.0 +0.7 16.9 29th 6.1 -0.2 0.0 1st 43.4 84.1 low 52%
Hogan Island 13.4   15.2 30th 9.5   7.8 19th 51.0


Antarctica and Macquarie Island (district 300)
Macquarie Island 5.5 +0.6 8.3 14th 2.0 +0.4 -0.6 6th 65.6 71.5 average 92%


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 10 am on Monday 2 August 2010. 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