Thursday, 1 July 2010 - Monthly Climate Summary for Tasmania - Product code IDCKGC17R0
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.
|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|
-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|
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 overall||379.4 mm at Mount Read|
3.8 mm at Hobart Airport|
85.0 mm at Mount Victoria (Una Plain) on the 17th|
|Highest wind gust||
144 km/h at Swan Island on the 18th|
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)
|Campbell Town (Elizabeth R)||30.0||on the 17th||29.7||on the 30th in 1967||23|
|Record lowest total June rainfall|
for June 2010 (mm)
|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
for June 2010 (°C)
Most recent June
at least this cool
|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|
|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%|
|Launceston (Ti Tree Bend)||13.4||+0.4||16.8||1st||2.8||-0.1||-2.4||13th||105.2||67.5||high||156%|
|Luncheon Hill (Forestry)||11.1||-0.1||14.9||1st||5.5||-0.2||1.7||10th||160.6||143.8||average||112%|
|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%|
|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%|
|Fingal (Legge Street)||12.4||-0.3||15.8||2nd||0.4||-0.7||-4.9||13th||44.4||64.5||average||69%|
|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%|
|St Helens Aerodrome||13.9||17.0||4th||4.7||0.5||28th||56.2||55.5||average||101%|
|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%|
|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%|
|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%|
|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%|
|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%|
|Central Plateau (district 96)|
|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%|
|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%|
|Scotts Peak Dam||10.2||+0.5||14.3||4th||4.1||+0.1||0.3||10th||185.2|
|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%|
|Antarctica and Macquarie Island (district 300)|
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
(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.