Friday, 1 May 2015 - Monthly Climate Summary for Tasmania - Product code IDCKGC17R0
Tasmania in April 2015: a dry, cool month
High pressure systems had a marked influence on Tasmania's weather during April, and the State had a relatively dry and cool month. Rainfall was well below average in the west and south, and temperatures were below average across the State.
- Rainfall well below average in the west and south
- Daytime and overnight temperatures below average overall
- Many cool days
- Several cold nights
In marked contrast to the generally wet March, Tasmania had a relatively dry April. With only a few rain-bearing cold fronts crossing the State the western half and the south recorded rainfall totals well below the monthly average, and a few sites in the northwest had their driest April since 1963. Even though Mount Read (on the West Coast) was the wettest spot in the State, its total of 126.2 mm was less than half of its long-term average. There were some moderate falls and thunderstorms as a cold front crossed on the morning of the 2nd, but most days saw little if any rain anywhere in the State. The wettest weather was in the northeast from the 24th to the 26th, as a complex area of low pressure brought some daily totals over 20 mm and ensured this was one of the few areas with near-average rain for the month. Hogan Island had the wettest single day, registering almost 35 mm in the 24 hours to 9 am on the 26th.
Daytime temperatures were below average overall, especially on the East Coast. Most days had below-average temperatures, with the only particularly warm days on the 1st (when several sites reached into the high 20s) and the 15th (where sites in the east reached into the low 20s). However, there were not any especially cold days: even on the generally cool 19th most areas reached over 12 °C. For many sites in Tasmania it was the coolest April since 2006, and in the east it was the coolest month since August last year.
Overnight temperatures were also below average, especially in the west. There was a mixture of relatively mild and quite cold nights scattered through the month. The coldest morning was on the 20th, when many inland sites reported temperatures well below zero, Liawenee dipped to -6.9 °C and a new low April temperature record was set on Flinders Island. The cool April follows on from a cool March.
Hobart's total rainfall was just 11.2 mm, well below the long-term average of 51 mm and the driest April since 2002 (when there was only 6 mm). The mean daily maximum of 16.7 °C was 0.6 °C below the long-term average. There were slightly more cool days than usual (9 days below 15 °C compared to a long-term average of about 8 such cool days) and slightly fewer mild days (5 days above 20 °C compared to a long-term average of about 6). It was the coolest April since the record-breaking 2006 (when Hobart's mean maximum was just 15.0 °C and there were 18 days below 15 °C). The mean overnight minimum temperature of 8.9 °C was just 0.1 °C below the long-term average.
|Extremes in April 2015|
|Hottest day||28.0 °C at Flinders Island Airport on the 1st|
|Warmest days on average||18.7 °C at Launceston (Ti Tree Bend)|
|Coolest days on average||7.3 °C at Mount Wellington|
|Coldest day||1.3 °C at Mount Wellington on the 19th|
|Coldest night||-6.9 °C at Liawenee on the 20th|
|Coolest nights on average||0.7 °C at Liawenee|
|Warmest nights on average||12.4 °C at Hogan Island|
|Warmest night||15.9 °C at Hogan Island on the 5th|
|Warmest on average overall||15.1 °C at Hogan Island|
|Coolest on average overall||4.4 °C at Mount Wellington|
|Wettest overall||126.2 mm at Mount Read|
|Wettest day||34.6 mm at Hogan Island on the 26th|
|Strongest wind gust||126 km/h at Hogan Island on the 2nd|
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|Record lowest April total rainfall|
|Butlers Gorge||41.2||44.3||in 1945||64||142.3|
|Savage River Mine||46.2||55.5||in 2002||47||154.6|
|Loongana (Serendipity)||28.6||28.8||in 2002||30||124.1|
|Lowest April total rainfall for at least 20 years|
|Yolla (Sea View)||23.0||21.4||in 1963||52||109.6|
|Frankford (Rossville)||16.6||8.7||in 1963*||51||83.7|
|Barrington Post Office||15.5||15.3||in 1967*||44||81.2|
|Forthside Research Station||18.2||12.0||in 1977||38||72.6|
|Wynyard Airport||14.2||13.4||in 1963*||27||72.0|
* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported.
|Record lowest April temperature|
|Flinders Island Airport||-0.4||on the 20th||-0.3||on the 30th in 2009||53||10.7|
|Summary statistics for April 2015|
|Northern (district 91)|
|Bridport (Sea View Villas)||17.8||-0.3||20.0||22nd||8.2||-1.3||3.0||20th||32.8||60.8||low||54%|
|Burnie (Round Hill)||17.6||-0.1||20.2||15th||9.3||-0.7||4.2||13th||28.2||73.7||low||38%|
|Cape Grim BAPS (Comparison)||15.8||-0.7||22.3||1st||10.2||-1.2||6.4||20th||28.0||66.2||v low||42%|
|Cressy Research Station||17.9||-0.3||21.1||1st||3.9||-1.6||-5.4||20th||9.6||42.6||v low||23%|
|Launceston (Ti Tree Bend)||18.7||-0.2||22.6||1st||6.4||-1.1||-0.7||20th||25.8||52.0||low||50%|
|Luncheon Hill (Forestry)||15.8||+0.2||21.8||1st||6.8||-1.3||2.6||3rd||22.4||100.5||v low||22%|
|Scottsdale (West Minstone Road)||17.0||-1.0||21.0||15th||7.3||-0.6||1.9||20th|
|Sheffield School Farm||16.3||-0.2||19.0||22nd||5.8||-1.2||0.4||20th||16.4||66.1||v low||25%|
|Smithton Aerodrome||17.6||-0.2||21.9||15th||5.7||-2.0||-1.9||20th||15.8||58.6||v low||27%|
|Wynyard Airport||17.4||-0.1||20.4||5th||5.9||-1.3||0.1||20th||14.2||72.0||v low||20%|
|East Coast (district 92)|
|Bicheno (Council Depot)||17.7||-1.2||23.4||15th||10.0||-0.3||5.0||20th||45.7||59.3||average||77%|
|Fingal (Legge Street)||16.8||-1.5||23.9||1st||4.6||-0.8||-4.4||20th||31.2||51.6||average||60%|
|Lake Leake (Elizabeth River)||12.9||-1.3||19.1||1st||3.7||-0.4||-4.5||20th||32.6||68.8||low||47%|
|Larapuna (Eddystone Point)||17.9||-0.3||23.3||15th||11.5||0.0||6.9||20th||33.6||65.9||low||51%|
|Maria Island (Point Lesueur)||16.1||-1.6||21.3||15th||10.8||-0.4||6.8||20th||19.8||39.2||low||51%|
|St Helens Aerodrome||17.3||-1.6||25.1||1st||9.1||-0.7||1.5||20th||41.4||58.0||average||71%|
|Swansea (Francis Street)||17.0||25.2||15th||8.4||1.7||20th||30.5|
|Midlands (district 93)|
|Ross (The Boulevards)||16.9||-0.6||22.4||1st||4.9||-0.7||-4.1||20th||20.0||35.7||low||56%|
|Southeast (district 94)|
|Cape Bruny (Cape Bruny)||15.6||-0.8||23.2||15th||9.5||-0.4||6.3||14th||33.8||53.9||low||63%|
|Cape Bruny Lighthouse||15.1||-0.4||22.7||15th||9.7||+0.1||6.9||14th||33.6||79.3||v low||42%|
|Dunalley (Stroud Point)||16.5||24.9||15th||10.1||5.8||14th||26.6|
|Geeveston (Cemetery Road)||16.5||-0.8||23.8||1st||6.2||-0.1||-0.9||20th||19.6||63.7||v low||31%|
|Grove (Research Station)||16.7||-1.1||24.5||1st||5.6||-0.1||-2.9||20th|
|Hobart (Ellerslie Road)||16.7||-0.6||25.2||1st||8.9||-0.1||3.4||20th||11.2||50.8||v low||22%|
|Maatsuyker Island Lighthouse||13.4||-1.1||22.2||1st||9.3||-0.2||5.7||19th||45.6||107.8||v low||42%|
|Melton Mowbray (North Stockman)||16.6||-0.7||25.8||1st||5.4||-0.4||-1.8||20th||11.8||28.9||low||41%|
|Tunnack Fire Station||14.0||-1.3||19.9||1st||4.3||-0.9||-3.4||20th||25.2||43.7||low||58%|
|Derwent Valley (district 95)|
|Bushy Park (Bushy Park Estates)||18.1||+0.1||24.2||1st||5.4||-0.8||-0.6||20th||7.0||46.0||v low||15%|
|Ouse Fire Station||18.0||-0.3||26.1||1st||4.5||-0.4||-2.7||13th||6.4||29.7||v low||22%|
|Central Plateau (district 96)|
|Lake St Clair National Park||12.7||-0.3||20.4||2nd||1.9||-1.0||-3.5||13th||45.2||133.7||v low||34%|
|West Coast (district 97)|
|Cape Sorell||15.3||-0.2||20.2||1st||9.7||-0.6||7.0||20th||37.2||108.6||v low||34%|
|Hartz Mountain (Keoghs Pimple)||10.5||-0.5||18.2||1st||3.7||-0.8||-0.6||20th||44.2||68.8||low||64%|
|Low Rocky Point||15.3||23.6||1st||9.5||5.7||20th||73.8||109.3||low||68%|
|Mount Read||8.0||-0.9||13.9||1st||2.5||-0.9||-1.6||19th||126.2||274.4||v low||46%|
|Scotts Peak Dam||13.8||-0.9||24.0||1st||6.3||-0.4||2.7||19th||72.0||125.6||low||57%|
|King Island (district 98)|
|King Island Airport||16.8||-1.0||25.3||1st||9.3||-1.2||3.5||13th||34.4||57.2||low||60%|
|Flinders Island (district 99)|
|Flinders Island Airport||18.0||-0.7||28.0||1st||8.9||-1.8||-0.4||20th||16.2||58.5||v low||28%|
|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.
A Climate Summary is generally published on the first working day of each month.
This statement has been prepared based on information available at 10 am on Friday 1 May 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
Averages for individual sites 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.
The ACORN-SAT dataset is used for temperature area averages.