Tuesday 1 May 2007 - Monthly Climate Summary for Tasmania - Product code IDCKGC17R0

Tasmania in April 2007
A dry month despite some rains

Summary

Despite some rain toward the end of the month, most of the state received below average rainfall for April. Some sites in the west, north coast and Midlands had their driest April on record, while the only areas to receive near-average rain were on the east and southeast coastal fringes. Both daytime and overnight temperatures were above average across most of the state.

Details

Very dry across the state: A pattern of slow moving high pressure systems during the first half of the month ensured that most of the state remained dry: a few weak cold fronts brought only light and patchy rain to the south and west. More rain fell during the third week, but most of the action was in the last two days, as a complex low pressure system passed over Bass Strait, bringing significant falls to the north and southeast, with some locally heavy falls to the east. Despite this,  rainfall was still well below average at most sites, with record low April rain at some sites in the west, the north and the Midlands.

A few warm days: There were many warm days during the month, especially in the second and third weeks and particularly on the 9th and 10th, when temperatures approached 30°C and Burnie and Wynyard had their highest April temperature on record. There were also a few cool days, particularly around the beginning and end of the month. Overall, temperatures were about 1°C warmer than average over most of the state and 2°C warmer in parts of the southeast and northwest of the state: Wynyard had its warmest April on record.

Mainly warm overnight : The warm days of the second and third weeks were accompanied by mild nights, and in the last week overcast conditions and persistent easterlies helped to keep temperatures up overnight, at least in the eastern half. Mean minimum temperatures for the month were mostly above average, typically by around 1°C.  

Long term rainfall still well below average: This April is the latest in a long line of relatively dry months. Rainfall for the 16 months from January 2006 to April 2007 shows a broad swathe of record low rainfall for the entire north coast, the northeast, Midlands and parts of the southeast and Derwent Valley; all other areas are also below average. 
Rainfall for the first four months of 2007 is below average across most of the state, although  areas that were especially wet in January and March (notably  the southeast, Derwent Valley and East Coast) are closer to average.

Further information

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

Extremes

Hottest day
Highest temperature
27.4°C at Campania (Kincora) on the 9th
Warmest days on average
Highest mean daily maximum temperature
20.2°C at Launceston (Ti Tree Bend)
Coolest days on average
Lowest mean daily maximum temperature
8.9°C at Mount Wellington
Coldest day
Lowest daily maximum temperature
2.8°C at Mount Wellington on the 24th
Coldest night
Lowest temperature
−5.5°C at Liawenee on the 7th
Coolest nights on average
Lowest mean daily minimum temperature
1.4°C at Liawenee
Warmest nights on average
Highest mean daily minimum temperature
13.9°C at Hogan Island
Warmest night
Highest daily minimum temperature
17.3°C at Bicheno (Council Depot) on the 10th
Wettest overall
Highest total rainfall
112.6 mm at Mount Wellington
Driest overall
Lowest total rainfall
3.0 mm at Campbell Town (Elizabeth R)
and Oatlands Post Office
Wettest day
Highest daily rainfall
57.6 mm at St Marys (Clive Street) on the 29th
Highest wind gust
115 km/h at Mount Wellington on the 10th

Records

Record lowest total April rainfall
Total rainfall
for April 2007 (mm)
Previous lowest
for April
Years of
record
Normal for
April
Oatlands Post Office 3.0 5.8 in 1923 119 47.0
Lake Margaret Power Station 68.0 81.2 in 2002 62 249.1
Strathgordon Village 59.6 73.6 in 2002 39 203.9
Scottsdale (West Minstone Road) 16.2 19.0 in 1987 37 80.7
Launceston (Ti Tree Bend) 4.4 17.4 in 2002 27 51.0
Campbell Town (Elizabeth R) 3.0 3.6 in 1967 21 39.5

Lowest total April rainfall for at least 20 years
Total rainfall
for April 2007 (mm)
Most recent lower
for April
Years since
lower
Normal for
April
Lilydale Post Office 11.6 7.4 in 1927 78 78.1
Ringarooma (Fry Street) 10.6 9.8 in 1927 75 89.3
Waratah (Mount Road) 37.6 7.8 in 1923 65 173.9
Cape Sorell 28.6 13.3 in 1923 59 111.5
Burnie (Round Hill) 20.6 7.7 in 1963 44 75.3
Launceston Airport Comparison 11.2 4.6 in 1963 44 54.4
Ulverstone (Knights Road) 13.6 5.0 in 1963 42 73.6
York Plains (Handroyd) 9.2 7.5 in 1967 40 49.4
Woodbridge 25.8 18.0 in 1945 38 80.6
Forthside Research Station 14.0 12.0 in 1977 30 73.7



Record highest April temperature
Highest temperature
in April 2007 (°C)
Previous highest
for April
Years of
record
Normal for
April
Burnie (Round Hill) 26.2 on the 10th 25.6 on the 13th in 1973 43 17.7
Wynyard Airport 27.2 on the 10th 26.5 on the 1st in 2005 22 17.2



Record highest April mean daily maximum temperature
Mean daily maximum
temperature
for April 2007 (°C)
Previous highest
for April
Years of
record
Normal for
April
Wynyard Airport 19.2 19.0 in 2005 23 17.2


16-month rainfall records

Record lowest total 16-month January to April rainfall
Total rainfall
for January 2006
 to April 2007 (mm)
Previous lowest
for the 16 months
January to April
Years of
record
Normal for
the 16 months
January to April
Oatlands Post Office 406.5 481.0 in 1967 115 721.7
Sorell (Whitlea) 475.0 479.0 in 1979 111 726.7
Frankford (Rossville) 700.8 860.5 in 1914 109 1303.9
Pioneer (Main Road) 665.0 785.8 in 1914 98 1193.9
Ulverstone (Knights Road) 625.8 737.4 in 1919 97 1166.1
Yolla (Sea View) 997.8 1207.9 in 1919 97 1768.6
Waratah (Mount Road) 1873.8 1896.5 in 1891 96 2695.9
Ringarooma (Fry Street) 946.2 1025.4 in 1987 95 1484.1
Latrobe (Coal Road) 647.3 740.6 in 1914 93 1163.1
Irishtown 931.2 1014.5 in 1940 92 1458.7
Eddystone Point 537.2 540.6 in 1997 91 984.9
York Plains (Handroyd) 463.8 506.4 in 1979 87 734.1
Mole Creek 657.0 766.3 in 1950 86 1380.8
Elliott Research Station 810.6 902.8 in 1919 70 1438.0
Bagdad Post Office 486.4 488.1 in 1999 67 756.9
Burnie (Round Hill) 522.3 767.4 in 1987 54 1180.3
Grove (Comparison) 687.4 700.6 in 1999 52 953.3
Lady Barron (Franklin Parade) 642.5 713.2 in 1997 51 953.9
Fort Direction 432.2 483.7 in 1982 45 700.8
Lorinna 959.2 1144.7 in 1919 43 1635.0
Devonport Airport 433.5 678.4 in 1994 41 964.3
Pyengana (Forest Lodge Road) 1031.8 1056.0 in 1967 38 1564.3
Barrington Post Office 708.8 972.2 in 1987 37 1391.5
Taroona (Taroona Crescent) 538.0 554.2 in 1979 37 848.5
Forthside Research Station 603.2 860.0 in 1987 34 1219.3
Rotherwood 503.4 603.9 in 1979 34 768.1
Scottsdale (West Minstone Road) 728.4 822.6 in 1987 34 1226.3
Memana (Babel Farm) 583.0 817.5 in 1967 33 1004.5
Wynyard Airport 641.8 980.8 in 2002 31 1192.9
King Island Airport 808.6 867.2 in 1997 27 1032.0
Launceston (Ti Tree Bend) 479.6 642.6 in 1987 25 833.0
Bull Bay (Lauriston) 570.5 593.4 in 1987 23 792.3
Scamander 530.6 610.7 in 1979 21 865.7

Lowest total 16-month January to April rainfall for at least 20 years
Total rainfall
for January 2006
to April 2007 (mm)
Most recent lower
for the 16 months
January to April
Years
since
lower
Normal for
the 16 months
January to April
Maatsuyker Island Lighthouse 1105.3 1057.4 in 1908 98 1580.1
Deal Island 536.9 462.3 in 1914 86 900.7
Lake Leake (Elizabeth River) 710.8 652.0 in 1919 85 1067.7
St Marys (Clive Street) 779.6 757.2 in 1919 84 1336.9
Yambacoona 817.2 778.4 in 1925 74 1068.0
Bicheno (Council Depot) 557.9 499.6 in 1922 68 924.5
City of Melbourne Bay 978.2 949.8 in 1941 65 1265.3
Bushy Park (Bushy Park Estates) 495.0 488.3 in 1961 44 740.6
Fingal (Legge Street) 500.0 457.8 in 1961 43 789.4
Levendale 685.2 621.2 in 1919 43 981.6
Avoca (Railway House) 480.4 443.4 in 1961 41 709.3
Gladstone (Old Post Office) 768.8 741.7 in 1966 34 1065.0
Hobart (Ellerslie Road) 542.2 512.2 in 1979 27 802.7
Hobart Airport 468.2 443.8 in 1979 27 657.4
Orford (Aubin Court) 565.4 559.0 in 1979 27 874.5
Eaglehawk Neck (Jetty Road) 879.8 828.5 in 1968 24 1148.5
Lewis Hill (St Pauls River) 527.4 468.6 in 1979 24 820.3

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 April 2007
Maximum temperatures
for April
(°C)
Minimum temperatures
for April
(°C)
Rainfall
for April
(millimetres)
Mean for
April
2007
Diff
from
normal
Highest for
April
2007
Mean for
April
2007
Diff
from
normal
Lowest for
April
2007
Total for
April
2007
Normal
for
April
Rank of
April
2007
Fraction of
April
normal
Northern (district 91)
Bridport 19.3 +1.3 23.5 15th 10.5 +1.3 6.4 3rd 15.4 52.8 very low 29%
Burnie 19.1 +1.5 26.2 10th 12.0 +2.1 7.4 7th 20.6 75.3 very low 27%
Cape Grim 17.6 +1.3 21.5 15th 12.2 +0.9 8.5 24th 74.4 67.0 normal 111%
Cressy 19.9 26.4 10th 5.9 −0.5 7th 9.8
Devonport Airport 19.1 +1.7 23.5 10th 9.7 +1.4 6.3 6th 13.8 61.0 very low 23%
Launceston 20.2 +1.4 24.6 15th 7.9 +0.5 3.1 7th 4.4 51.0 lowest 9%
Launceston Airport 19.5 25.7 10th 7.2 2.6 7th 9.6
Launceston Ap Comparison 18.8 +1.4 25.0 10th 7.4 +0.8 2.1 7th 11.2 54.4 very low 21%
Low Head 18.9 +1.4 21.5 22nd 11.6 +0.9 8.3 3rd 11.0 54.5 very low 20%
Luncheon Hill 17.6 +2.3 24.8 15th 9.3 +1.5 5.1 6th 36.0 99.5 very low 36%
Marrawah 18.3 +1.5 23.3 15th 10.9 +0.7 7.2 12th 34.4 86.0 very low 40%
Powranna 19.2 +1.6 25.8 10th 6.2 +0.2 0.6 7th 14.8 44.4 very low 33%
Scottsdale 19.0 +1.1 24.1 10th 8.3 +0.5 3.0 3rd 16.2 80.7 lowest 20%
Sheffield 18.5 +2.1 25.0 10th 7.6 +0.8 2.8 24th 31.0 56.4 low 55%
Smithton 19.1 +1.6 25.8 10th 9.0 +1.8 3.1 13th 31.2 56.2 low 56%
Wynyard 19.2 +1.9 27.2 10th 8.5 +1.7 3.3 4th 27.0 74.2 low 36%
East Coast (district 92)
Bicheno 19.1 +0.2 26.0 10th 11.3 +1.1 7.4 12th 36.3 60.6 normal 60%
Eddystone Point 19.6 +1.6 25.2 10th 12.9 +1.5 9.6 12th 8.6 65.5 very low 13%
Fingal 18.2 −0.1 24.2 15th 6.2 +0.8 −1.0 7th 12.0 52.4 low 23%
Friendly Beaches 18.9 +0.3 26.8 10th 10.3 +0.8 5.4 4th
Lake Leake 14.9 +0.8 21.6 15th 4.5 +0.4 −1.2 4th 23.6 70.4 low 34%
Maria Island 17.9 23.2 10th 11.8 8.7 12th 34.8
Orford 18.0 −0.4 24.8 9th 9.4 +1.1 4.0 8th 33.0 59.1 low 56%
Scamander 19.1 +0.3 26.8 10th 10.9 +1.5 6.4 12th 47.4 69.3 normal 68%
St Helens 18.9 25.8 10th 10.5 5.7 12th 36.0
Swan Island 18.8 21.7 15th 13.3 10.7 3rd 29.0
Swansea Post Office 18.5 −0.2 26.7 10th 9.3 +1.1 3.7 12th 39.2 51.6 normal 76%
Midlands (district 93)
Ross 19.1 +1.9 26.6 10th 6.9 +1.4 −0.1 7th 5.6 38.7 very low 14%
Southeast (district 94)
Bull Bay 17.6 +0.4 26.0 9th 9.7 +0.2 6.5 13th 36.0 47.4 normal 76%
Campania 19.0 27.4 9th 7.7 1.6 12th 21.4
Cape Bruny 16.7 +0.5 24.8 9th 10.3 +0.7 6.8 26th 60.6 53.1 normal 114%
Cape Bruny Lighthouse 16.0 +0.5 24.3 9th 10.5 +0.9 6.9 26th 70.2 80.4 normal 87%
Dover 17.3 +0.6 25.9 9th 7.0 −0.1 1.2 26th 35.6 67.2 low 53%
Geeveston 17.8 +0.8 26.1 13th 6.7 +0.6 −0.5 26th 25.4 63.3 low 40%
Grove Comparison 18.3 +0.8 27.0 13th 6.1 −0.2 −0.2 12th 28.6 62.1 low 46%
Grove 18.2 26.5 13th 5.4 −0.9 12th 29.0
Hobart 17.5 +0.2 26.0 9th 9.7 +0.8 5.7 3rd 25.8 51.4 low 50%
Hobart Airport 18.3 +0.3 27.2 9th 9.1 +0.4 1.8 12th 20.4 43.6 low 47%
Maatsuyker Island 15.0 +0.6 21.0 9th 10.6 +1.2 8.5 25th 47.6 109.3 very low 44%
Melton Mowbray 18.0 +1.0 25.7 9th 6.7 +1.3 0.7 12th 12.6 30.3 low 42%
Mount Wellington 8.9 +0.6 16.3 14th 3.3 +1.2 −0.8 7th 112.6 86.1 high 131%
Tasman Island 15.2 21.5 9th 10.2 8.2 7th 33.0
Tunnack 16.1 +1.1 23.8 9th 5.4 +0.5 −0.3 3rd 13.6 45.7 low 30%
Derwent Valley (district 95)
Bushy Park 19.6 +1.7 27.1 9th 6.4 +0.2 0.8 13th 10.6 47.2 very low 22%
Maydena 17.2 +1.4 24.5 9th 5.7 +0.5 0.0 26th 32.1 88.8 very low 36%
Moogara 15.4 +2.0 22.2 13th 6.5 +1.4 0.4 4th 20.8 60.9 very low 34%
Ouse 19.4 26.4 9th 5.8 −0.9 8th
Tarraleah 14.8 +1.0 21.2 9th 3.6 −0.4 −1.8 12th 34.1 96.2 very low 35%
Central Plateau (district 96)
Lake St Clair 14.5 +1.7 21.0 13th 2.6 0 −2.6 12th 41.6 137.4 very low 30%
Liawenee 13.5 19.2 15th 1.4 −5.5 7th 24.8
West Coast (district 97)
Hartz Mountains 12.6 +1.9 21.3 13th 5.5 +1.3 2.3 26th 55.6 65.3 low 85%
Mount Read 10.9 +2.2 17.5 15th 4.4 +1.3 0.2 6th 90.8 256.8 very low 35%
Scotts Peak Dam 16.1 22.7 14th 7.0 1.6 26th 42.8
Strahan Aerodrome 17.8 +1.4 24.4 9th 8.2 0 2.8 27th 36.4 111.9 very low 33%
Strathgordon 15.2 +1.2 21.4 13th 6.7 −0.2 2.1 25th 59.6 203.9 lowest 29%
Warra 14.1 21.8 9th 6.7 1.4 26th 47.2
King Island (district 98)
King Island Airport 19.0 +1.6 24.8 9th 10.7 +0.5 3.0 13th 39.2 56.0 low 70%
Flinders Island (district 99)
Flinders Island Airport 19.6 +1.0 23.4 10th 10.5 −0.2 3.1 7th 48.2 59.7 normal 81%
Hogan Island 18.9 23.6 14th 13.9 11.8 7th 51.0
Macquarie Island (district 300)
Macquarie Island 6.8 −0.2 8.1 24th 3.5 −0.1 −1.0 13th 89.4 93.6 normal 96%

Notes

This statement has been prepared based on information available at 10 am on Tuesday 1 May 2007. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Normals 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 "normal" 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, normal in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of normal shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

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