Wednesday, 1 July 2009 - Monthly Climate Summary for Tasmania - Product code IDCKGC27R0

Tasmania in June 2009: Very wet and foggy in the east, but drier than usual in the west

The "normal" June weather pattern dominated by westerly winds over Tasmania was supplanted for June 2009 by slow-moving high pressure systems over the Tasman Sea and troughs in easterly winds. This led to well above average rainfall in the east but below average falls in the west. The easterly weather patterns also led to relatively mild nights, frequent foggy mornings, a lack of thunderstorms and strong winds, and less snow than is usual for this time of the year.

An archive of previous monthly summaries for Tasmania is also available, as are summaries for other states and many other climate summaries and diagnostics.

Details

Some heavy rain events: From the 3rd to the 7th a complex easterly trough formed over Tasmania bringing extraordinary rainfall totals to the east of the state, and much the same occurred again on the 25th and 26th. Both Copping (on the 5th) and Nugent (on the 26th) had their wettest day on record, with totals of over 130 mm in 24 hours. Several other sites in the southeast had their highest June daily rainfall on record on either the 5th or 26th (or both in the case of Mount Wellington), and Deal Island's 79.0 mm on the 7th is its highest June daily rainfall in 113 years. Totals of 50 to 80 mm were widespread in the east and southeast during both events. The heavy rain caused minor to moderate flooding of several rivers in the east.

A wet month in the east: Heavy rainfall in the east at the start and end of the month meant that June was much wetter than normal along in the east of Tasmania. Totals in most areas reached 100 mm, several sites had more than 200 mm, and over 400 mm fell at Gray and on Mount Wellington. Many sites in the southeast and a few in the east had their wettest June on record, including St Marys, Premaydena (on the Tasman Peninsula) and Lunawanna (on Bruny Island), all of which have been recording rainfall since the early 1900s. It was the wettest June in over 20 years for most remaining sites in the east, and for some it was the wettest month for decades. Hobart, for example, had its wettest June since 1954, and its wettest month since April 1996, whilst Orford had its wettest month since December 1970.

It was a different story in the west where many sites had only half of their normal June rain. Although the normally wet Mount Read received 161 mm, this is less than the rain from just the first week at several sites in the east. In a typical June, westerly winds are dominant and cold fronts cross the state at regular intervals bringing rainfalls of over 200 mm to the west and around 50 mm to the east. This month, however, there were only eight or so days of westerly winds and only three cold fronts. The only significant snow falls of the month were behind a cold front on the 9th when snowfalls settled to around 300 metres in some southern areas. Rainfall in the central north was mostly near normal.

In the area around Hobart, June was the fifth consecutive "wet" month. Hobart received 401 mm for the first half of 2009, which is the wettest start to a year since 1996. However only the southeast, southern Midlands and lower east have received this consistent wet weather, and it comes after a long series of very dry seasons.

Warm and foggy mornings: Winds were predominately easterly during June, dragging moist air from the Tasman Sea over Tasmania. Along with the rain this brought, it also ensured overnight temperatures remained above average on most nights. Mean minima for the month were one to two degrees warmer than usual at most sites in the east and northwest and slightly warmer than usual elsewhere (except for the Bass Strait Islands which were slightly cooler than usual). On average, nights at Fingal were three degrees warmer than usual and it, along with Launceston and Scamander, had its highest June mean daily minimum temperature on record. The rainy nights were the warmest, including the 4th, 5th, 6th, 21st and 27th when many sites in the north and east had double-digit minima. Tarraleah had its warmest June night on record when it didn't fall below 8.6°C in the 24 hours to 9 am on the 5th. The high moisture content in the air also led to many foggy mornings, with fog lasting well into the afternoon in the Derwent Valley on several days.

Mostly near average daytime temperatures: There were no very warm days during June — the highest temperature was just 18.2°C at Eddystone Point on the 4th - and the last day of the month was the warmest for many sites. There were a few cold days between the 9th and 15th when winds were mostly southerly, but otherwise maxima were mostly near or slightly warmer than usual. Ouse and Bushy Park were two exceptions; they had several cold days when fog persisted for most or all of the day. The coldest was the 23rd when Ouse only reached 4.6°C. Except for Ouse (which was a degree and a half cooler than usual), mean maxima for the month were generally within half a degree of normal; mostly warmer than usual but a little cooler than usual near the east coast. 

Further information

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

Extremes

Hottest day
Highest temperature
18.2°C at Eddystone Point on the 4th
Warmest days on average
Highest mean daily maximum temperature
14.4°C at Eddystone Point
Coolest days on average
Lowest mean daily maximum temperature
4.7°C at Mount Wellington
Coldest day
Lowest daily maximum temperature
−0.4°C at Mount Wellington on the 14th
Coldest night
Lowest temperature
−6.2°C at Mount Wellington on the 10th
Coolest nights on average
Lowest mean daily minimum temperature
−0.7°C at Liawenee
Warmest nights on average
Highest mean daily minimum temperature
10.2°C at Hogan Island
Warmest night
Highest daily minimum temperature
13.6°C at Flinders Island Airport on the 4th
Wettest overall
Highest total rainfall
481.8 mm at Gray (Dalmayne Rd)
Driest overall
Lowest total rainfall
54.6 mm at Kimberley (Mersey River)
Wettest day
Highest daily rainfall
137.0 mm at Nugent (Twilight Valley) on the 26th
Highest wind gust
124 km/h at Mount Read on the 30th

Records

Record highest June daily rainfall
Highest daily rainfall
in June 2009 (mm)
Previous highest
for June
Years of
record
Deal Island 79.0 on the 7th 69.9 on the 12th in 1891 113
Dover 77.2 on the 5th 63.0 on the 1st in 1964 62
Grove (Comparison) 70.8 on the 26th 59.7 on the 7th in 1956 58
Taroona (Taroona Crescent) 53.4 on the 5th 39.9 on the 1st in 1964 47
Copping ** 134.8 on the 5th 33.4 on the 3rd in 1981 40
Risdon Vale (Poplar Road) 58.2 on the 26th 41.4 on the 22nd in 2005 30
Mount Wellington 114.2 on the 26th 89.8 on the 22nd in 2005 29
Blackmans Bay Treatment Plant 56.2 on the 5th 34.8 on the 25th in 1998 28
Nugent (Twilight Valley) ** 137.0 on the 26th 58.4 on the 25th in 1998 27
Tea Tree (The Point) 47.4 on the 26th 33.4 on the 14th in 1988 24

** These daily totals for Copping and Nugent and their highest daily totals for any month.


Record highest total June rainfall
Total rainfall
for June 2009 (mm)
Previous highest
for June
Years of
record
Average for
June
St Marys (Clive Street) 357.6 356.0 in 1922 104 99.3
Premaydena Hatchery 182.4 173.7 in 1923 102 72.6
Lunawanna ** 295.0 250.5 in 1954 99 83.0
Dover 192.0 180.4 in 1956 74 80.1
Orford (Aubin Court) 230.0 194.8 in 1954 57 53.6
Hobart Airport 134.8 71.2 in 1998 52 32.1
Memana (Babel Farm) 130.5 126.0 in 2002 46 75.3
Taroona (Taroona Crescent) 156.2 92.0 in 1981 44 42.9
Huonville (Tutton Avenue) 141.9 132.6 in 2002 40 57.5
Copping ** 320.0 109.6 in 1981 39 60.5
Rotherwood 135.0 114.0 in 1981 38 43.9
Risdon Vale (Poplar Road) 175.8 67.2 in 1998 28 39.5
Nugent (Twilight Valley) ** 359.8 132.2 in 1998 27 66.8
Mount Wellington ** 411.4 155.6 in 2005 25 77.2
Tea Tree (The Point) 137.4 63.2 in 2004 24 38.7

** These sites also had their highest monthly total on record for any month (however, there may be gaps in the records).

Highest total June rainfall for at least 20 years
Total rainfall
for June 2009 (mm)
Most recent higher
for June
Years since
higher
Average for
June
Oatlands Post Office 134.8 221.2 in 1889 115 47.6
York Plains (Handroyd) 119.0 140.6 in 1947 62 44.7
Bagdad Post Office 128.3 156.2 in 1952 56 44.6
Bothwell (Cluny) 120.8 175.8 in 1952 56 46.8
Mangalore (Mangalore Farm) 133.6 159.8 in 1952 56 43.5
Grove (Comparison) 158.6 199.5 in 1954 55 62.1
Hobart (Ellerslie Road) 144.2 238.3 in 1954 55 54.5
Glenorchy (Glenorchy Reservoir) 141.8 236.8 in 1954 54 61.4
Fort Direction 124.4 145.3 in 1954 49 42.4
Deal Island 143.0 151.0 in 1961 47 78.3
Bicheno (Council Depot) 171.4 201.6 in 1956 46 61.3
Eaglehawk Neck (Jetty Road) 255.4 255.8 in 1954 46 91.3
Eddystone Point 131.2 132.0 in 1964 44 74.8
Tooms Lake (Tooms River) 185.6 219.5 in 1970 30 47.3
Woodbridge 194.4 200.0 in 1956 29 81.0
Fingal (Legge Street) 108.2 194.8 in 1981 28 64.6
Lake Leake (Elizabeth River) 178.4 317.6 in 1981 28 86.9
Lewis Hill (St Pauls River) 158.8 237.0 in 1981 28 61.0
Swansea Post Office 132.6 178.4 in 1981 28 57.5
Cape Bruny Lighthouse 181.4 225.0 in 1983 26 90.7
Mauriceton (Jordan River) 85.0 96.6 in 1981 20 40.7


Record highest June daily minimum temperature
Highest daily minimum
temperature
in June 2009 (°C)
Previous highest
for June
Years of
record
Average for
June
Tarraleah Village 8.6 on the 5th 8.5 on the 2nd in 1999 25 0.6



Record highest June mean daily minimum temperature
Mean daily minimum
temperature
for June 2009 (°C)
Previous highest
for June
Years of
record
Average for
June
Scamander 7.4 6.7 in 2008 26 5.5
Launceston (Ti Tree Bend) 4.8 4.6 in 2004 25 2.8
Fingal (Legge Street) 4.1 2.9 in 1991 22 1.0



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 June 2009
Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(millimetres)
Mean for
June
2009
Diff
from
average
Highest for
June
2009
Mean for
June
2009
Diff
from
average
Lowest for
June
2009
Total for
June
2009
Average
for
June
Rank of
June
2009
Fraction of
June
average
Northern (district 91)
Bridport 13.8 −0.3 16.1 2nd 6.9 +0.7 3.6 9th 64.7 85.4 average 76%
Burnie 13.9 +0.5 16.0 22nd 8.4 +1.7 3.3 10th 88.0 103.3 average 85%
Cape Grim BAPS 13.2 +0.3 15.8 27th 8.9 +0.2 4.4 10th 82.4 80.1 average 103%
Cressy Research Station 12.4 +0.1 15.3 30th 3.6 +2.0 −2.5 16th 90.4 59.0 high 153%
Devonport Airport 13.4 +0.1 17.2 2nd 6.3 +1.3 0.1 10th 67.2 79.1 average 85%
Launceston 13.2 +0.2 17.5 21st 4.8 +2.0 −0.2 16th 77.4 66.0 average 117%
Launceston Airport 12.2   16.0 30th 3.9   −1.5 16th 67.0
Low Head 13.2 −0.3 15.7 30th 7.7 +0.2 4.3 10th 57.2 71.6 average 80%
Luncheon Hill 11.6 +0.4 16.6 5th 6.5 +0.9 0.3 10th 109.4 142.6 low 77%
Marrawah 13.2 +0.4 16.0 21st 8.2 +0.8 4.0 10th 99.2 122.9 average 81%
Scottsdale 12.9 +0.3 16.1 4th 5.0 +0.9 0.7 11th 72.6 102.3 low 71%
Sheffield School Farm 11.8 +0.2 14.0 30th 4.8 +0.9 0.8 24th 125.8 108.9 average 116%
Smithton Aerodrome 13.7 0.0 16.4 29th 6.0 +1.1 0.6 9th 66.6 94.3 low 71%
Wynyard Airport 13.6 +0.3 15.9 30th 5.5 +1.4 0.0 10th 92.8 110.6 average 84%
East Coast (district 92)
Eddystone Point 14.4 +0.7 18.2 4th 8.9 +0.9 4.6 11th 131.2 74.8 high 175%
Fingal 12.6 −0.2 15.7 30th 4.1 +3.1 −2.3 19th 108.2 64.6 high 167%
Lake Leake 9.2 +0.2 12.4 20th 2.4 +1.9 −3.6 16th 178.4 86.9 high 205%
Maria Island 12.7   15.7 30th 8.4   5.2 16th 178.0
Orford 12.9 −0.4 15.8 21st 5.9 +1.8 0.4 16th 230.0 53.6 highest 429%
Scamander 14.3 −0.1 17.2 29th 7.4 +2.0 3.5 16th 164.4 52.9 very high 311%
St Helens Aerodrome 14.0   17.7 4th 6.9   2.4 16th 157.8
Swan Island 14.0   17.5 4th 9.5   4.3 10th 96.2
Swansea Post Office 13.6 −0.2 16.9 30th 5.7 +1.3 0.4 19th 132.6 57.5 very high 231%
Midlands (district 93)
Ross 12.0 +0.3 15.9 30th 4.0 +2.2 −2.0 16th 78.8 38.1 high 207%
Southeast (district 94)
Campania 12.8   16.1 30th 4.3   0.2 2nd 118.2 41.4 very high 286%
Cape Bruny 12.2 −0.2 15.9 21st 7.5 +0.3 3.8 16th 193.2 77.9 very high 248%
Cape Bruny Lighthouse 12.0 +0.4 15.5 21st 7.4 +0.7 4.1 16th 181.4 90.7 very high 200%
Dover     14.9 16th 4.2 +0.4 −0.5 2nd 192.0 80.1 highest 240%
Geeveston 12.6 +0.3 17.1 30th 3.0 +0.8 −2.2 2nd 130.4 72.2 very high 181%
Grove 12.5 +0.3 17.7 30th 3.6 +1.2 −2.3 16th 158.6 62.1 very high 255%
Grove 12.1   17.5 30th 3.0   −3.0 16th 152.2
Hobart 12.4 +0.5 16.7 30th 5.8 +0.7 2.1 16th 144.2 54.5 very high 265%
Hobart Airport 12.7 −0.2 16.8 30th 5.7 +1.2 2.1 3rd 134.8 32.1 highest 420%
Maatsuyker Island Lighthouse 12.1 +0.7 16.1 30th 8.5 +1.3 4.2 10th 106.4 118.4 average 90%
Melton Mowbray 11.3 −0.6 15.3 30th 3.1 +1.0 −3.0 1st 80.8 35.9 very high 225%
Mount Wellington 4.7 +1.2 8.3 23rd 0.4 +1.2 −6.2 10th 411.4 77.2 highest 533%
Tunnack Fire Station 9.9 0.0 13.5 4th 3.0 +0.7 −1.0 16th 178.4 58.1 very high 307%
Derwent Valley (district 95)
Bushy Park 11.2 0.0 17.0 30th 3.1 +1.0 −2.3 16th 70.6 48.6 high 145%
Maydena Post Office 10.6 −0.2 14.6 30th 3.4 +1.0 −1.1 20th 90.3 99.0 average 91%
Ouse Fire Station 10.7 −1.3 17.4 30th 2.5 +1.2 −2.8 1st 70.0 48.3 high 145%
Tarraleah Village 9.3 +0.5 13.6 30th 1.7 +1.1 −2.1 1st 131.4 102.7 high 128%
Central Plateau (district 96)
Butlers Gorge 9.0 +1.3 12.5 30th 0.9 +0.7 −5.0 19th 94.4 153.2 low 62%
Lake St Clair National Park 8.3 +0.7 11.0 20th 0.3 +0.1 −4.0 1st 77.8 169.1 low 46%
Liawenee 7.0   9.5 22nd −0.7   −5.1 23rd 114.4
West Coast (district 97)
Hartz Mountain 7.6 +0.4 12.0 23rd 3.2 +1.0 −2.2 10th 210.6 97.1 very high 217%
Mount Read 5.4 +0.8 11.1 23rd 1.8 +0.9 −4.0 10th 161.0 343.5 very low 47%
Scotts Peak Dam 10.2 +0.6 13.8 20th 4.3 +0.3 0.4 2nd 104.8
Strahan Aerodrome 13.3 +0.7 16.8 21st 5.5 +0.1 1.2 15th 103.4 160.4 low 64%
Strathgordon Village 10.2 +0.7 16.0 30th 4.2 +0.4 0.5 20th 97.0 214.3 very low 45%
Warra 9.4   12.7 30th     −1.3 16th
King Island (district 98)
King Island Airport 14.4 +0.5 17.4 30th 7.9 −0.3 2.9 27th 142.8 97.6 high 146%
Flinders Island (district 99)
Flinders Island Airport 14.4 +0.4 17.6 30th 6.5 −0.5 0.6 16th 72.4 71.9 average 101%
Hogan Island 13.9   17.4 30th 10.2   5.4 10th 63.2
Antarctica and Macquarie Island (district 300)
Macquarie Island 5.0 0.0 7.4 8th 2.0 +0.5 −6.1 15th 52.4 76.0 low 69%


Notes

This statement has been prepared based on information available at 9 am on Wednesday 1 July 2009. 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

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