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.

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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

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window


Record lowest April total rainfall
New record
(mm)
Old
record
Years of
record
Average for
April
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
Observed
(mm)
Most recent
lower
Years since
lower
Average for
April
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
New record
(°C)
Old
record
Years of
record
Average for
April
Flinders Island Airport -0.4 on the 20th -0.3 on the 30th in 2009 53 10.7



Summary statistics for April 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
April
2015
Diff
from
average
Highest for
April
2015
Mean for
April
2015
Diff
from
average
Lowest for
April
2015
Total for
April
2015
Average
for
April
Rank of
April
2015
Fraction of
April
average
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 15.4   21.6 1st 9.9   6.2 20th 23.4
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%
Devonport Airport 17.4 -0.3 20.1 22nd 7.3 -1.4 1.0 20th 29.4 60.2 low 49%
Launceston (Ti Tree Bend) 18.7 -0.2 22.6 1st 6.4 -1.1 -0.7 20th 25.8 52.0 low 50%
Launceston Airport 17.5 -0.7 22.5 1st 5.4 -1.3 -3.3 20th 21.4 46.0 low 47%
Low Head 17.4 -0.3 19.9 22nd 10.1 -1.0 4.9 20th 42.8 56.5 average 76%
Luncheon Hill (Forestry) 15.8 +0.2 21.8 1st 6.8 -1.3 2.6 3rd 22.4 100.5 v low 22%
Marrawah 16.4 -0.4 22.0 1st 9.0 -1.3 4.3 20th 36.4 84.1 v low 43%
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%
Friendly Beaches 17.3 -1.4 23.2 15th 9.5 -0.3 4.5 20th 42.4 51.0 average 83%
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%
Swan Island 17.4 -0.8 21.6 15th 11.7 -1.1 6.8 3rd 56.6 51.4 high 110%
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)
Campania (Kincora) 17.7 -1.3 25.3 1st 7.2 -0.2 0.4 20th 10.4 33.4 low 31%
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%
Dennes Point 16.5   23.4 1st 9.5   6.1 14th 21.0
Dover 16.1 -0.7 24.0 15th 6.3 -0.8 0.6 20th 36.0 66.8 low 54%
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%
Hobart Airport 17.1 -1.0 25.4 1st 8.3 -0.5 3.4 14th 13.6 41.7 low 33%
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%
Mount Wellington 7.3 -1.1 12.7 15th 1.2 -1.0 -3.1 19th 51.0 87.7 low 58%
Tasman Island 13.8 -1.2 21.2 1st 9.2 -0.6 5.4 19th 51.0 67.4 average 76%
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)
Butlers Gorge 13.1 0.0 21.2 1st 2.7 -0.7 -3.3 13th 41.2 142.3 lowest 29%
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%
Liawenee 11.6 -0.5 19.5 1st 0.7 -1.0 -6.9 20th 10.0 66.8 v low 15%
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%
Strahan Aerodrome 16.0 -0.7 23.6 1st 7.3 -1.1 1.4 13th 69.8 113.7 low 61%
Warra 12.6 -0.9 21.9 1st 4.6 -1.2 -0.1 14th 62.8 131.4 low 48%
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%
Hogan Island 17.9   26.6 1st 12.4   9.5 21st 47.6 54.7 average 87%
Antarctica and Macquarie Island (district 300)
Macquarie Island 7.0 0.0 8.7 18th 3.4 -0.3 -0.5 13th 94.2 93.4 average 101%

Notes

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 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.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
(03) 9669 4057
Enquiries