Tasmanian Monthly Climate Summary: June 2006
Record dry and record cold nights

Monday 3 July, 2006

In Brief

High pressure systems close to Tasmania meant that there was much less rain, and many more cold nights, than is normal for June.

Details

Record dry June in some areas: Rainfall was very low over most of the state during June, with totals below 10 mm common in the Midlands, the East Coast and the Derwent Valley. Several sites in the central north (including Launceston)  and some around Hobart (including Sorell and Mangalore, both with over 100 years of record)  had their driest-ever June and many more had their driest June for several decades.
Hobart's 6.6 mm was almost 50 mm less than normal for June. It was Hobart's second-driest June since observations began in 1882 (the driest was in 1979), and its driest month since November 2003.
There was rain scattered through the month in most areas, but falls were generally light. Apart from some falls in the northwest at the very start of the month, and through the north around the 23rd, most of the heavier rain was confined to the western highlands.

An extended "cold and dry spell": The spell of mostly patchy or light rain and cold temperatures in many areas extends back to about 11 May. The six or so weeks prior to that had been cold but very wet; some places had their wettest or coldest ever April or their coldest ever May. Rainfall totals for the first half of the year are below normal in almost all parts of the state, and especially so in the north and east.

Record cold nights: Minimum (overnight) temperatures were below normal in all but the far southwest, and by up to 2.5 degrees in the central north. Several sites, including Launceston, recorded their coldest-ever June mean daily minimum temperatures, sometimes by a significant margin.
Almost all nights were colder than normal, often by several degrees. Despite may cold mornings, only Wynyard recorded its coldest-ever June night.

Cool, but not cold, days: Most days were cooler than normal, but often by not very much. The first week was quite cold, but a few warmer days scattered through the month helped to balance these. Averaged across the month, maximum (daytime) temperatures were mostly between 0.1 and 0.5 degrees below normal. At just a handful of sites (Strathgordon, Grove, Maatsuyker Island and Ross) mean June maxima were the coldest they had been since 1995.

High pressure systems the cause: Since about mid-May, Tasmania's weather has often been under the influence of strong high pressure systems. These have suppressed the westerly winds and cold fronts that usually bring a great deal of our rain at this time of year. They have also allowed for light winds and clear skies overnight - especially in the north - and so provided the cold and frosty nights. The same highs have been at the heart of one of the coldest and driest Junes in many parts of Australia.

Included in this summary are a table of extremes, some new records, and summaries for sites across Tasmania.

Further information

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

Extremes

Weather extremes during June 2006

Highest temperature
Hottest day
18.2 °C Scamander on 15th
Highest mean daily maximum temperature
Warmest days on average
14.3 °C Bicheno (Council Depot)
Lowest mean daily maximum temperature
Coolest days on average
3.2 °C Mount Wellington
Lowest daily maximum temperature
Coldest day
0.0 °C Mount Read on 11th
Lowest temperature
Coldest night
−9.0 °C Liawenee on 7th
Lowest mean daily minimum temperature
Coldest nights on average
−2.9 °C Liawenee
Highest mean daily minimum temperature
Mildest nights on average
9.4 °C Hogan Island
Highest daily minimum
Warmest night
12.7 °C Eddystone Point on 23rd
Highest total rainfall
Wettest overall
213.8 mm Mount Read
Lowest total rainfall
Driest overall
2.8 mm Bothwell (Clyde River)
Highest daily rainfall
Wettest day
63.8 mm Stanley (Marine Parade) on 1st


Records

Record Lowest Total Rainfall for June


Total rainfall
for June 2006 (mm)
Previous lowest
for June
Years of
record
Sorell (Whitlea) 5.8 6.3
in 1966
119
Avoca (Railway House) 7.0 10.2
in 1944
110
Mangalore (Mangalore Farm) 4.8 7.1
in 1966
105
Lilydale Post Office 16.8 17.3
in 1930
104
York Plains (Handroyd) 6.8 10.2
in 2000
90
Bagdad Post Office 5.8 8.4
in 1999
81
Launceston Airport Comparison 10.6 11.7
in 1934
74
Lady Barron (Franklin Parade) 20.4 20.7
in 1914
73
Fort Direction 7.6 7.9
in 1967
59
Glenorchy (Glenorchy Reservoir) 7.6 8.0
in 1979
55
Pyengana (Forest Lodge Road) 28.2 39.3
in 1969
44
Devonport Airport 13.8 29.8
in 1967
43
Memana (Babel Farm) 14.2 29.9
in 1984
43
Scottsdale (West Minstone Road) 18.8 54.2
in 1984
35
Westbury (Birralee Road) 24.4 37.3
in 1978
29
Launceston (Ti Tree Bend) 10.4 21.2
in 1996
27
Risdon Vale (Poplar Road) 3.4 7.7
in 1965
25
Blackmans Bay Treatment Plant 5.2 16.6
in 1999
24
Bull Bay (Lauriston) 15.4 20.4
in 1997
23
Tea Tree (The Point) 5.8 13.2
in 1999
21


Lowest Total Rainfall for at least 20 years for June


Total rainfall
for June 2006 (mm)
Most recent lower
for June
Eddystone Point 14.4 14.3
in 1914
Bushy Park (Bushy Park Estates) 7.2 3.2
in 1930
Lake Leake (Elizabeth River) 18.0 17.8
in 1934
Frankford (Rossville) 32.2 29.4
in 1937
Ringarooma (Fry Street) 27.4 18.3
in 1934
Gladstone (Old Post Office) 18.4 17.7
in 1934
Burnie (Round Hill) 29.6 27.3
in 1949
Flinders Island Airport 18.8 12.9
in 1948
Victoria Valley (Glenrowan) 12.8 11.4
in 1950
Cape Barren Island (Cape Barren School) 16.4 10.9
in 1948
Swansea Post Office 5.6 2.5
in 1965
Forthside Research Station 32.8 29.0
in 1969
Latrobe (Coal Road) 26.8 24.9
in 1969
Ulverstone (Knights Road) 34.3 32.4
in 1969
Barrington Post Office 47.8 36.2
in 1969
Deal Island 12.1 8.0
in 1972
Cape Bruny Lighthouse 36.2 33.4
in 1979
Cape Sorell 68.8 56.2
in 1955
Grove (Comparison) 13.2 8.6
in 1979
Hobart (Ellerslie Road) 6.4 1.8
in 1979
Hobart Airport 6.0 5.2
in 1979
Levendale 16.6 7.2
in 1979
Lewis Hill (St Pauls River) 13.6 5.8
in 1979
Taroona (Taroona Crescent) 4.6 3.8
in 1979
Nugent (Twilight Valley) 21.2 19.8
in 1984
Premaydena Hatchery 27.8 24.6
in 1984
Copping 27.2 25.0
in 1984
Huonville (Tutton Avenue) 15.4 7.4
in 1979
Mole Creek 57.6 56.0
in 1986
Lorinna 57.0 54.3
in 1951
Woodbridge 20.8 20.7
in 1966



Record Lowest Mean Daily Minimum Temperature for June


Mean daily minimum
temperature
for June 2006 (°C)
Previous lowest
for June
Years of
record
Launceston Airport Comparison 0.2 0.8
in 1973
68
Flinders Island Airport 4.6 5.4
in 1995
44
Bicheno (Council Depot) 5.1 5.3
in 1986
32
Launceston (Ti Tree Bend) 0.2 1.3
in 1983
23
Wynyard Airport 1.4 2.6
in 1997
21
Fingal (Legge Street) −1.5 −1.2
in 1993
20


Lowest Mean Daily Minimum Temperature for at least 20 years for June


Mean daily minimum
temperature
for June 2006 (°C)
Most recent lower
for June
Swansea Post Office 3.2 3.1
in 1985
Burnie (Round Hill) 5.9 5.5
in 1986
Eddystone Point 6.7 6.6
in 1986



Record Lowest Temperature for June


Lowest temperature
in June 2006 (°C)
Previous lowest
for June
Years of
record
Wynyard Airport −3.5
on 11th
−3.3
on 18th in 2002
21



Summaries

Summary statistics for June 2006


Maximum temperatures
for June
(°C)
Minimum temperatures
for June
(°C)
Rainfall
for June
(mm)
Mean for 2006 Difference from normal Highest for 2006 Mean for 2006 Difference from normal Lowest for 2006 Total for 2006 Normal total Ranking
Hobart 11.9 −0.1 15.0 4.9 −0.3 0.8 6 54 very low
Launceston 13.0 −0.1 16.5 0.2 −2.7 −3.0 10 68 lowest
Burnie 13.4 0 16.2 5.9 −0.8 1.7 30 105 very low
Devonport
12.8 −0.5 15.5 3.4 −1.8 −1.9 14 81 lowest
Swansea 13.6 −0.3 16.6 3.2 −1.2 −1.7 6 57 very low
Strahan
12.4 −0.2 15.5 5.3 −0.5 −0.7 81 169 very low
Strathgordon
9.2 −0.3 12.3 4.1 +0.3 0.2 167 219 normal
King Island Airport 13.3 −0.6 14.7 6.5 −1.9 1.7 53 97 very low
Flinders Island Airport 13.4 −0.7 15.8 4.6 −2.5 −0.9 19 73 very low
Bicheno 14.3 −0.2 17.7 5.1 −1.6 0.8 34 60 normal
Bridport 13.5 −0.5 15.7 5.0 −1.4 0.0 12 95 lowest
Bull Bay 12.4 −0.3 15.5 5.5 −0.9 2.4 15 45 lowest
Bushy Park 12.4 +1.2 15.9 1.2 −0.9 −3.8 7 49 very low
Campania 13.2
16.2 2.3
−2.4 4

Cape Bruny 11.7 −0.8 15.4 6.7 −0.6 3.9 38

Cape Bruny Lighthouse 11.6 0 14.9 6.6 −0.1 4.1 36 90 very low
Cape Grim
12.8 −0.2 14.3 7.8 −1.0 3.1 67 80 low
Cressy11.7
15.3 −1.7
−6.1 14

Dover 12.4 −0.2 15.7 3.3 −0.6 −1.1 39 79 low
Eddystone Point 14.0 +0.3 16.5 6.7 −1.3 2.6 14 75 very low
Fingal 12.0 −0.8 15.4 −1.5 −2.6 −5.6 20 65 very low
Friendly Beaches 13.8 −0.5 16.6 4.4 −2.3 0.5 16

Geeveston 12.0 −0.3 15.2 2.2 0 −3.2 29 72 very low
Grove 12.4 +0.2 15.6 1.8 −0.6 −2.6 13 61 very low
Grove 12.3
15.7 1.3
−3.1 13

Hartz Mountain 5.8 −1.6 9.4 1.4 −1.0 −1.9 50

Hobart Airport 13.2 +0.4 16.6 4.2 −0.4 −0.7 6 31 very low
Hogan Island 13.2
14.4 9.4
7.1 21

Lake Leake 8.5 −0.5 10.7 −1.2 −2.0 −5.7 18 87 very low
Lake St Clair 7.2 −0.5 9.6 −0.9 −1.3 −6.2 91 181 low
Launceston Airport 11.8
15.9 0.0
−4.9 9

Launceston Airport Comparison 11.3 −0.1 15.3 0.2 −2.7 −3.8 11 63 lowest
Liawenee 6.3
9.4 −2.9
−9.0 32

Low Head 12.7
14.1 5.5
2.4 15

Luncheon Hill 10.6 −0.5 13.0 5.1 −0.8 0.0 138 154 normal
Maatsuyker Island
10.8 −0.7 13.9 7.4 +0.2 4.3 83 120 low
Maria Island 12.8
16.3 6.9
4.0 9

Macquarie Island4.9−0.17.61.2−0.3−4.57976normal
Marrawah 12.7 −0.1 14.8 7.0 −0.4 3.5 92 126 low
Maydena10.4 −0.5 13.1 2.4 −0.1 −4.2 47 106 low
Melton Mowbray 11.4 −0.7 13.9 1.0 −1.4 −6.8 6 35 lowest
Moogara 8.6 −0.4 11.2 2.2 −0.3 −2.0 28 71 low
Mount Read 3.8 −0.9 8.1 0.3 −0.8 −3.8 214 381 low
Mount Wellington 3.2 −0.3 6.8 −1.0 −0.2 −4.6 37 64 normal
Orford 12.7 −0.7 16.3 3.3 −0.8 −2.0 13 51 very low
Ouse 11.9
15.3 0.1
−6.1 5

Powranna 11.5 −0.4 15.5 0.3 −2.2 −4.8 13 50 lowest
Ross 11.0 −0.8 14.5 −1.3 −3.4 −6.4 9 39 lowest
Scamander 14.0 −0.5 18.2 4.1 −1.3 0.8 24 49 low
Scottsdale 12.2 −0.5 14.3 2.6 −1.6 −1.1 19 107 lowest
Sheffield11.5 −0.2 14.8 2.2 −2.0 −1.6 48 120 lowest
Smithton
13.2 −0.6 14.9 2.9 −2.5 −1.9 78

St Helens
13.4
17.3 3.2
0.0 15

Swan Island 13.0
15.2 7.6
3.6 16

Tarraleah
8.5 −0.3 11.4 −0.4 −1.0 −5.6 59 103 low
Tasman Island 10.5
13.0 6.7
2.5 38

Tunnack
9.3
12.1 0.6
−4.8 11

Warra 8.6
11.7 2.9
−0.9 88

Wynyard
13.1 −0.1 15.5 1.4 −2.9 −3.5 38 114 very low

Note

This statement has been prepared based on information available at 9 am on Monday 3 July 2006 . Although every effort has been made to check them, it is possible that results will change as new information becomes available.

"Normals" are based on all available years of record, which vary widely from site to site . Sites without normals shown do no have sufficient record for them to be calculated reliably.

The "Ranking" indicates about where rainfall this time ranks in the climate record for the site.


Further information

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