Tasmania in June 2010: Rainy days and frosty nights

A succession of cold fronts during June brought regular rain to the west and north, but little of this rain managed to reach the southeast. Consequently, the southeast was dry while the west and north were wet. Cold and frosty mornings were common, but temperatures generally recovered during the day so that overall the month was warmer than usual.

  • Monthly totals from below 4 mm to nearly 400 mm
  • A chilly -6.3 C at Ross on the 27th
  • Snow to low levels from the 9th to 11th
  • Record warm January to June

Many rainy days — except in the southeast

June was wet in the north and west of Tasmania but dry in the southeast. Totals ranged from 379 mm at Mount Read in the west and 310 mm at Mount Victoria in the northeast highlands to just 3.8 mm at Hobart Airport, making it the wettest June in 5 or 6 years in the north but the driest June on record for some sites in the southeast. The weather pattern created this disparity: westerly winds and cold fronts regularly delivered rain to the west and north, but the rain dissipated before reaching the southeast.

Active cold fronts crossed the state on the 9th, 17th, 18th, 25th and 28-29th, each bringing around 50 mm to parts of the state. The highest daily total was 85.0 mm at Mount Victoria on the 17th, a day on which 20 to 40 mm fell through much of the north and Campbell Town had its wettest June day on record. Minor flooding developed in the North Esk and South Esk rivers after this rain, persisting for several days.

Cold and frosty overnight

The westerly pattern present for most of June led to mean monthly minima near average in the west but below average elsewhere, typically by around a degree but up to two degrees in the central east. Cold and frosty nights were common as high pressure systems moved over the state behind fronts. Launceston had its coldest morning in nearly two years, dropping to -2.4 C on the 13th, Flinders Island's 1.7 C on the 27th was its coldest June morning since 1994 and on five separate occasions Ross fell to -5 C. The coolest nights on average were at Liawenee (-1.2 C), but surprisingly it was Ross that registered the coldest temperature for the month, dropping to -6.3 C on the morning of the 27th.

A brief respite from the chill came on the 25th when cloud, wind and rain combined to keep minima around 5 C warmer than usual. Eddystone Point's minimum of 13.3 C was the highest in Tasmania for the month, and several sites in the north had their warmest June night in around five years.

A few cold days but warmer than normal overall

Daytime temperatures were mild between the 1st and 4th with many sites climbing over 15 C, a mark that was hard to match for the rest of the month. Swansea was the warmest, reaching 18.3 C on the 2nd — its warmest June day since 2003. A front on the 5th brought a run of cooler days, which turned even colder after further fronts on the 9th and 11th. Snow fell after the second front, descending to as low as 250 metres in the south at times. Mount Wellington struggled to reach -1.5 C on the 11th. But from the 13th until the end of the month daytime temperatures were generally warmer than usual. Exceptions were the 26th, in the wake of a cold front, and in the north and east on the 27th, when sunshine wasn't enough to warm the air after a very cold night. It was also cold in the Derwent Valley on the 15th, 16th and 23rd due to fog persisting for most of the day.

Overall, mean maxima for June were slightly warmer than usual, apart from a few inland sites which were slightly cooler than usual.

Dry in Hobart, especially in comparison to 2009

Hobart missed out on most of the rain in June, receiving just 10.6 mm for the month and taking the year to date total to 135 mm. It has been the driest first half of the year in Hobart since 1984, along with a handful of other sites in the southeast. This is in stark contrast to last year, when 144 mm fell in June 2009 alone.

Hobart had several cold and frosty mornings, falling below below 3 C on seven different occasions. The mean minimum temperature was 5.0 C, slightly below the long-term average. Most days were warmer than usual, five days reached at least 16 C and only one day (the 10th) didn't reach 10 C. The mean maximum temperature of 13.5 C was 1.5 C above the long-term average.

A warm year so far

The first six months of this year have been the warmest on record for Tasmania, after above average temperatures in every month. Tasmania's mean temperature for the year so far is 12.59 C, which is 1.04 C above normal and just slightly warmer than 1988. Hobart (with a mean temperature from January to June 2010 of 15.1 C) and Launceston (15.2 C) are among the sites that have had their warmest first half of the year on record. Across the state, mean maximum temperatures are around a degree warmer than usual, while mean minimum temperatures are around half a degree warmer than usual.

Rainfall for the year to date has been above average in the north but below average in the south.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in June 2010
Hottest day 18.3 C at Swansea Post Office on the 2nd
Warmest days on average 15.1 C at Bicheno (Council Depot)
Coolest days on average 3.2 C at Mount Wellington
Coldest day -1.5 C at Mount Wellington on the 11th
Coldest night -6.3 C at Ross (The Boulevards) on the 27th
Coolest nights on average -1.2 C at Liawenee
Warmest nights on average 9.9 C at Hogan Island
Warmest night 13.3 C at Eddystone Point on the 25th
Warmest on average overall 11.8 C at Hogan Island
Coolest on average overall 1.2 C at Mount Wellington
Wettest overall379.4 mm at Mount Read
Driest overall 3.8 mm at Hobart Airport
Wettest day 85.0 mm at Mount Victoria (Una Plain) on the 17th
Highest wind gust 144 km/h at Swan Island on the 18th

Maps

ObservedAnomalyDecile 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 highest June daily rainfall

Highest daily rainfall
in June 2010 (mm)
Previous wettest
for June
Years of
record
Campbell Town (Elizabeth R) 30.0 on the 17th 29.7 on the 30th in 1967 23



Record lowest total June rainfall

Total rainfall
for June 2010 (mm)
Previous driest
for June
Years of
record
Average for
June
Hobart Airport 3.8 5.2 in 1979 53 31.6
Nugent (Twilight Valley) 16.6 19.8 in 1984 28 65.0
Blackmans Bay Treatment Plant 14.8 16.6 in 1999 27 44.2



Lowest June mean daily minimum temperature for at least 20 years

Mean daily minimum
temperature
for June 2010 (C)
Most recent June
at least this cool
Years since
cooler
Average for
June
Swansea Post Office * 2.4 1.9 in 1983 27 4.4

* Note that the Swansea Post Office site moved in September 2008, and the new site appears to be significantly cooler overnight than the old site.



Summary statistics for June 2010
Maximum temperatures
for June
(C)
Minimum temperatures
for June
(C)
Rainfall
for June
(millimetres)
Mean for
June
2010
Diff
from
average
Highest for
June
2010
Mean for
June
2010
Diff
from
average
Lowest for
June
2010
Total for
June
2010
Average
for
June
Rank of
June
2010
Fraction of
June
average
Northern (district 91)
Bridport (Sea View Villas) 13.8 -0.2 16.4 1st 5.5 -0.8 0.5 27th 131.0 88.1 high 149%
Burnie (Round Hill) 13.9 +0.5 16.5 2nd 6.9 +0.2 2.6 10th 97.9 103.3 average 95%
Cape Grim BAPS 13.4 +0.4 16.0 4th 8.7 0.0 5.3 27th 81.2 80.2 average 101%
Cressy Research Station 12.1 -0.3 15.1 2nd 1.0 -0.8 -4.6 13th 71.0 60.1 average 118%
Devonport Airport 13.7 +0.4 15.8 1st 4.5 -0.6 -0.8 13th 98.6 78.9 average 125%
Launceston (Ti Tree Bend) 13.4 +0.4 16.8 1st 2.8 -0.1 -2.4 13th 105.2 67.5 high 156%
Launceston Airport 12.0   15.0 1st 2.1   -3.7 27th 85.4
Low Head 13.6 +0.1 17.0 1st 7.1 -0.4 2.4 27th 110.0 74.7 high 147%
Luncheon Hill (Forestry) 11.1 -0.1 14.9 1st 5.5 -0.2 1.7 10th 160.6 143.8 average 112%
Marrawah 13.0 +0.2 15.6 3rd 7.6 +0.2 3.5 7th 105.2 122.4 average 86%
Scottsdale (West Minstone Road) 12.1 -0.5 15.2 2nd 4.0 -0.2 -0.5 28th 156.6 103.7 high 151%
Sheffield School Farm 11.3 -0.3 14.2 5th 3.2 -0.7 -2.1 27th 113.0 109.2 average 103%
Smithton Aerodrome 13.8 +0.1 16.5 1st 4.2 -0.8 -0.7 27th 76.4 92.9 low 82%
Wynyard Airport 13.8 +0.5 16.3 2nd 3.4 -0.8 -1.8 27th 102.2 110.5 average 92%
East Coast (district 92)
Bicheno (Council Depot) 15.1 +0.6 17.5 2nd 6.7 +0.1 2.9 8th 20.4 60.8 low 34%
Eddystone Point 14.6 +0.9 18.0 4th 7.7 -0.3 1.8 10th 68.6 74.7 average 92%
Fingal (Legge Street) 12.4 -0.3 15.8 2nd 0.4 -0.7 -4.9 13th 44.4 64.5 average 69%
Friendly Beaches 14.1 0.0 17.6 4th 5.8 -0.7 1.6 15th 18.0 34.7 low 52%
Lake Leake (Elizabeth River) 8.7 -0.3 11.6 24th -0.6 -1.3 -5.8 27th 63.8 86.5 average 74%
Maria Island (Point Lesueur) 13.4   16.6 2nd 7.8   4.2 10th 8.8
Orford (Aubin Court) 13.2 -0.1 17.2 25th 3.2 -0.9 -1.0 23rd 16.6 53.0 low 31%
Scamander 14.5 +0.1 17.1 1st 5.3 -0.2 1.8 28th 54.5 53.0 average 103%
St Helens Aerodrome 13.9   17.0 4th 4.7   0.5 28th 56.2 55.5 average 101%
Swan Island 14.0   16.9 24th 8.7   2.8 27th 48.0
Swansea Post Office 14.3 +0.5 18.3 2nd 2.4 -2.0 -1.7 28th 16.4 57.1 low 29%
Midlands (district 93)
Ross (The Boulevards) 11.8 +0.1 15.4 1st 0.0 -1.9 -6.3 27th 51.4 38.9 high 132%
Southeast (district 94)
Bull Bay (Lauriston) 13.2 +0.6 17.0 2nd 6.1 0.0 3.2 10th 17.0 47.2 v low 36%
Campania (Kincora) 14.1 +0.5 17.8 2nd 2.4 -1.5 -2.7 15th 6.2 38.2 low 16%
Cape Bruny (Cape Bruny) 12.7 +0.3 16.1 25th 7.1 -0.1 4.8 12th 44.2 75.3 average 59%
Cape Bruny Lighthouse 12.4 +0.8 15.8 25th 7.2 +0.5 5.0 8th 59.8 90.5 low 66%
Dover 13.1 +0.5 16.6 3rd 3.3 -0.5 -0.9 27th 32.0 78.7 low 41%
Geeveston (Cemetery Road) 12.8 +0.5 15.5 4th 1.7 -0.5 -2.8 16th 38.8 71.2 low 54%
Grove (Research Station) 13.3   17.2 25th 0.5   -4.1 27th 21.8
Hobart (Ellerslie Road) 13.4 +1.4 17.5 25th 5.0 -0.2 1.2 27th 10.6 54.2 v low 20%
Hobart Airport 13.9 +1.0 17.7 2nd 4.4 -0.2 0.3 13th 3.8 31.6 lowest 12%
Maatsuyker Island Lighthouse 11.6 +0.2 15.5 24th 8.0 +0.8 4.0 10th 96.6 118.2 average 82%
Melton Mowbray (North Stockman) 12.3 +0.4 15.8 2nd 1.0 -1.2 -6.0 27th 8.0 33.9 v low 24%
Mount Wellington 3.2 -0.4 8.4 3rd -0.8 0.0 -5.0 10th 31.0 72.3 low 43%
Tasman Island 11.3   14.6 2nd 7.2   2.2 10th 58.2
Tunnack Fire Station 9.8 -0.2 14.5 2nd 1.0 -1.3 -5.7 27th 16.0 54.8 v low 29%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 12.3 +1.1 17.6 2nd 0.7 -1.4 -2.9 30th 17.4 48.4 v low 36%
Maydena Post Office 10.9 +0.1 13.6 25th 2.5 0.0 -1.6 27th 67.9 97.3 low 70%
Ouse Fire Station 12.3 +0.4 16.2 2nd 0.7 -0.7 -3.8 30th 14.8 45.5 low 33%
Tarraleah Village 8.9 +0.1 12.0 25th 1.5 +0.9 -2.5 7th 78.6 102.4 average 77%
Central Plateau (district 96)
Butlers Gorge 8.2 +0.6 11.5 22nd 0.0 -0.2 -5.1 16th 125.2 152.7 average 82%
Lake St Clair National Park 7.6 -0.1 10.2 3rd 0.2 0.0 -3.7 16th 173.4 169.4 average 102%
Liawenee 6.1   11.1 3rd -1.2   -5.5 15th 99.2 109.2 average 91%
West Coast (district 97)
Hartz Mountain (Keoghs Pimple) 6.2 -1.0 9.5 23rd 1.9 -0.3 -2.1 10th 45.6 92.9 low 49%
Mount Read 4.0 -0.7 7.3 22nd 0.6 -0.4 -3.1 10th 379.4 346.3 average 110%
Scotts Peak Dam 10.2 +0.5 14.3 4th 4.1 +0.1 0.3 10th 185.2
Strahan Aerodrome 12.9 +0.3 15.9 24th 5.9 +0.4 0.9 7th 208.4 140.2 high 149%
Strathgordon Village 9.7 +0.2 13.1 24th 3.8 0.0 0.5 27th 222.4 214.4 average 104%
Warra 8.9   11.6 4th 3.0   -2.0 27th 112.6
King Island (district 98)
King Island Airport 14.0 +0.1 16.2 4th 7.5 -0.6 3.8 27th 125.0 98.7 high 127%
Flinders Island (district 99)
Flinders Island Airport 14.2 +0.1 17.0 3rd 6.0 -1.0 -1.7 27th 41.0 71.4 low 57%
Hogan Island 13.7   16.8 1st 9.9   6.9 10th 67.2
Antarctica and Macquarie Island (district 300)
Macquarie Island 5.7 +0.7 7.4 17th 2.5 +1.0 -3.4 12th 60.4 76.1 average 79%


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 9 am on Thursday 1 July 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