Tasmania in August 2018: wet in the west and windy

Westerly winds dominated Tasmania's weather for much of August, ensuring the western highlands had more rain than usual. Temperatures were mostly above average in the first half of the month but below average in the second half.

Wet in the west, dry in the central north and northeast

  • Westerly winds and cold fronts brought rain to much of Tasmania several times during August, with the highest falls in the western highlands
  • Total rainfall was above average in the west, but below average in the central north and the northern East Coast
  • Tasmania's total rainfall for August was 12.5 % above average
  • Rain falling onto very wet soils led to river rises and some minor flooding several times during August

Mild start and cold towards the end

  • Minimum temperatures were mostly above average in the first half of the month and below average in the second half
  • Most areas had their coldest night of the month (and coldest night of winter) in the last few days of the month
  • Some sites, including Smithton, Strahan and King Island had their lowest August temperature on record on the 29th or 30th
  • Mount Read's -5.3 °C on the 28th was its lowest temperature on record for any month
  • Daytime temperatures were mild around the 10th, 14th and 25th, but colder than average around the 19th and 27th when many sites had their coldest day of winter
  • The State's mean minimum temperature was 0.26 °C below average, the mean maximum temperature right on average and the overall mean temperature 0.12 °C below average

Strong winds, high tides and flooding

  • Strong and gusty winds associated with cold fronts and low pressure systems caused damage several times during August
  • Especially strong and gusty winds were recorded on the 15th: every site (apart from Launceston) registered a gust over 80 km/h and Maatsuyker Island reached 163 km/h
  • Low atmospheric pressure and strong onshore winds, coupled with high astronomical tides, caused localised inundation between the 10th and 15th
  • Very wet upper soil layers in many areas meant rainfall from cold fronts frequently led to river rises and flooding in several catchments many times during the month

Hobart (Ellerslie Road)

  • Total rainfall for Hobart (Ellerslie Road) was 53.4 mm, which is right on average
  • Rain was recorded on 19 days, just above the August average of 15 days
  • The mean daily maximum temperature for Hobart (Ellerslie Road) was 13.9 °C, which is 0.8 °C above the long-term average of 13.1 °C. The warmest day was 17.8 °C on the 14th, and the coolest day was on the 19th when the temperature reached 9.0 °C
  • The temperature stayed below 10.0 °C on 4 days which is average for August, with all of those days in the last third of the month
  • The mean daily minimum temperature for Hobart (Ellerslie Road) was 5.5 °C, which is 0.3 °C above the long-term average of 5.2 °C. The coldest morning was 0.6 °C on the 20th, and the warmest morning was on the 14th when the minimum temperature was 10.2 °C
  • The minimum temperature dropped below 2.0 °C on 2 days, just below the August average of 3 days

 

Further information

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Extremes in August 2018
Hottest day19.8 °C at Friendly Beaches on the 10th
Warmest days on average 14.4 °C at Bicheno (Council Depot) and Friendly Beaches
Coolest days on average2.6 °C at kunanyi (Mount Wellington Pinnacle)
Coldest day-3.1 °C at kunanyi (Mount Wellington Pinnacle) on the 27th
Coldest night-8.4 °C at Liawenee on the 23rd
Coolest nights on average-1.9 °C at Liawenee
Warmest nights on average7.9 °C at Swan Island
Warmest night12.1 °C at Flinders Island Airport on the 5th
Warmest on average overall10.6 °C at King Island Airport
Coolest on average overall0.4 °C at kunanyi (Mount Wellington Pinnacle)
Wettest overall516.7 mm at Lake Margaret Dam
Wettest day65.4 mm at Mount Read on the 14th
Strongest wind gust 163 km/h at Maatsuyker Island Lighthouse on the 15th

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 August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Strahan Aerodrome -2.5 on the 29th -1.8 on the 24th in 2015 26 5.7
King Island Airport -0.1 on the 29th 0.0 on the 26th in 2006 23 7.7
Friendly Beaches -0.3 on the 30th -0.1 on the 2nd in 2004 22 6.1
Smithton Aerodrome -3.1 on the 29th -2.2 on the 7th in 2010 22 5.1
Mount Read -5.3 on the 28th -5.0 on the 27th in 2017 21 0.0



Summary statistics for August 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2018
Diff
from
average
Highest for
August
2018
Mean for
August
2018
Diff
from
average
Lowest for
August
2018
Total for
August
2018
Average
for
August
Rank of
August
2018
Fraction of
August
average
Northern (district 91)
Cape Grim 12.3   15.5 3rd 7.6   2.5 28th 152.4
Cape Grim BAPS (Comparison) 12.7 0.0 16.3 3rd 7.5 -0.7 2.5 28th 149.2 99.7 high 150%
Devonport Airport 13.1 0.0 15.1 14th 4.5 -0.5 -0.8 29th 66.6 90.3 average 74%
Launceston (Ti Tree Bend) 13.6 -0.2 16.3 5th 3.2 -0.4 -2.2 30th 42.8 85.2 low 50%
Launceston Airport 12.4 -0.5 15.0 5th 2.1 -0.7 -2.8 20th 48.0 77.9 average 62%
Low Head 12.8 -0.3 14.2 9th 6.8 -0.4 1.6 20th 44.2 79.5 low 56%
Luncheon Hill (Forestry) 10.4 -0.8 15.1 24th 4.4 -0.5 0.3 27th 253.8 212.4 high 119%
Marrawah 12.7 0.0 15.2 24th 6.7 -0.3 0.5 28th 192.6 134.5 v high 143%
Scottsdale (West Minstone Road) 11.8 -0.8 14.4 25th 3.5 -0.4 -0.9 20th 101.2 119.7 average 85%
Sheffield School Farm 10.9 -0.7 13.3 24th 2.9 -0.8 -2.3 29th 92.4 131.6 low 70%
Smithton Aerodrome 13.3 -0.3 15.6 5th 4.5 -0.6 -3.1 29th 186.0 124.7 high 149%
Wynyard Airport 13.0 -0.3 15.5 14th 3.6 -0.3 -2.9 28th 126.6 117.2 average 108%
East Coast (district 92)
Bicheno (Council Depot) 14.4 -0.3 18.9 14th 6.5 +0.2 1.4 30th 33.5 49.8 average 67%
Fingal (Legge Street) 12.9 -0.4 17.8 25th 1.4 +0.2 -3.4 30th 26.0 59.5 low 44%
Friendly Beaches 14.4 -0.3 19.8 10th 5.9 -0.2 -0.3 30th 41.6 51.2 average 81%
larapuna (Eddystone Point) 13.8 +0.3 16.1 24th 6.5 -0.4 1.1 20th 35.2 70.5 low 50%
Maria Island (Point Lesueur) 12.9 -0.5 16.7 14th 7.1 -0.3 3.7 30th 36.8 39.5 average 93%
Orford (Aubin Court) 13.8 -0.2 18.8 14th 4.4 +0.2 -1.6 30th 60.4 60.5 average 100%
St Helens Aerodrome 13.8 -0.4 17.4 10th 5.0 -0.2 0.1 30th 29.8 58.0 average 51%
Swan Island 13.1 -0.4 15.3 10th 7.9 -0.4 2.6 20th 48.4 62.1 average 78%
Swansea (Francis Street) 14.0   18.5 25th 4.4   -1.8 30th 40.2
Midlands (district 93)
Ross (The Boulevards) 11.8 -0.7 15.2 14th 1.4 -0.7 -3.4 2nd 41.6 45.7 average 91%
Southeast (district 94)
Campania (Kincora) 13.7 -0.5 18.4 25th 4.0 +0.1 -1.9 30th 48.2 50.4 average 96%
Cape Bruny (Cape Bruny) 12.7 -0.1 17.8 10th 6.3 -0.3 3.0 30th 92.6 88.1 average 105%
Cape Bruny Lighthouse 12.3 +0.4 17.7 10th 6.5 +0.2 3.7 30th 100.6 92.8 average 108%
Dennes Point 13.0   18.0 14th 6.4   2.0 30th 39.4
Dover 12.8 -0.3 18.7 10th 3.3 -0.6 -1.0 20th 111.2 90.6 high 123%
Dunalley (Stroud Point) 13.2   18.0 10th 6.3   1.7 30th 48.8
Grove (Research Station) 13.1 -0.3 17.0 25th 2.4 -0.3 -2.3 2nd 42.2 82.6 low 51%
Hobart (Ellerslie Road) 13.9 +0.8 17.8 14th 5.5 +0.3 0.6 20th 53.4 53.5 average 100%
Hobart Airport 13.7 +0.2 17.6 25th 5.1 +0.4 0.3 30th 40.0 46.1 average 87%
kunanyi (Mount Wellington Pinnacle) 2.6 -0.2 6.8 25th -1.8 -0.1 -5.7 20th 25.2 81.4 low 31%
Maatsuyker Island Lighthouse 11.1 -0.1 15.7 10th 6.5 0.0 3.3 27th 120.2 123.7 average 97%
Melton Mowbray (North Stockman) 12.3 -0.3 17.0 25th 2.7 +0.2 -3.9 30th 46.6 50.0 average 93%
Tasman Island 11.0 -0.4 15.4 25th 6.1 -0.3 1.8 27th 94.0 75.7 high 124%
Tunnack Fire Station 10.3 -0.2 14.7 14th     -4.2 2nd 33.6 58.7 low 57%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 13.6 +0.5 18.2 25th 1.7 -0.6 -3.1 30th 20.4 54.1 v low 38%
Maydena Post Office 11.3 -0.5 16.3 10th 2.6 +0.1 -2.0 28th 151.6 152.4 average 99%
Ouse Fire Station 13.1 -0.4 17.6 25th 1.7 -0.2 -4.4 30th 59.6 63.8 average 93%
Central Plateau (district 96)
Butlers Gorge 8.2 +0.2 12.6 30th 0.2 +0.2 -5.8 30th 277.6 185.0 high 150%
Lake St Clair National Park 7.6 -0.5 12.6 25th -0.2 -0.4 -5.7 28th 283.6 238.9 average 119%
Liawenee 6.0 -0.5 13.2 25th -1.9 -0.6 -8.4 23rd 122.8 132.8 average 92%
West Coast (district 97)
Cape Sorell 12.8 +0.6 15.6 24th 7.3 0.0 2.4 28th 165.2 148.5 average 111%
Hartz Mountain (Keoghs Pimple) 5.7 -0.9 11.5 30th 0.7 -0.6 -2.4 20th 144.4 119.7 high 121%
Low Rocky Point 12.5   16.1 3rd 6.7   0.9 29th 185.4 149.3 high 124%
Mount Read 3.1 -0.9 7.6 24th -0.8 -0.8 -5.3 28th 466.6 348.9 high 134%
Scotts Peak Dam 10.0 -0.4 14.4 30th 3.1 -0.3 -0.6 28th 308.2 224.6 high 137%
Strahan Aerodrome 13.0 0.0 17.2 3rd 5.4 -0.3 -2.5 29th 238.6 181.2 high 132%
Warra 9.2 -0.3 14.2 10th 1.8 -0.7 -3.9 30th 286.2 236.8 high 121%
King Island (district 98)
King Island Airport 13.5 -0.2 16.1 5th 7.6 -0.1 -0.1 29th 132.4 116.1 average 114%
Flinders Island (district 99)
Flinders Island Airport 13.4 -0.4 17.2 5th 6.1 -0.5 -2.2 30th 65.0 75.9 average 86%
Hogan Island 13.1 -0.2 17.5 10th 7.7 -1.1 5.0 7th 116.0 73.9 high 157%
Note: From 2017, information about Macquarie Island can be found in the climate summary for the Remote Islands and Antarctica

Notes

The Monthly climate summary, generally published on the first working day of each month, lists 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. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This statement has been prepared based on information available at 9 am on Monday 3 September 2018. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

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.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
Enquiries