Tasmania in September 2018: A dry start to spring

September was dry right across Tasmania, with several sites observing either their driest September on record or in more than 20 years. Maximum temperatures were warmer than average in the east. Minimum temperatures were warmer than average in the far southeast but cooler than average in the northeast.

Drier than average across Tasmania

  • There were less rain-bearing cold fronts than is usual in September, with drier than average conditions experienced in all areas bar a small area of the northwest
  • Area-averaged rainfall was 37.0% of the long-term average and the lowest since 2015
  • Some locations had either their lowest total September rainfall on record, or their lowest total September rainfall for at least 20 years
  • In the east, Maria Island recorded only 6 mm which was 13% of average, and in the west Mount Read recorded 381.0 mm, 104% of its September average

A mix of cold and warm weather

  • There were a few cold periods in September with snow on the higher peaks, including at the start of the month, mid-month, around the 23rd to 25th and on the 29th when most locations observed their coldest temperatures of the month
  • The lowest temperature observed in Tasmania was -7.5 °C at Liawenee on the morning of the 3rd, and the coldest maximum temperature was -1.1 °C on the top of kunanyi (Mount Wellington) on the 1st
  • There was some warmer than average weather amongst the cold, including from the 10th and 14th, around the 18th and again towards the end of the month
  • The highest temperature observed was 22.7 °C at Dover on the 11th and at Friendly Beaches on the 18th, and the warmest night 13.5 °C at Flinders Island Airport on the 15th
  • Maximum temperatures tended above average in the east but close to average elsewhere
  • Minimum temperatures were above average in the far southeast but cooler than average in the northeast, and close to average elsewhere
  • Averaged across the state, the mean maximum temperature was 0.49 °C above average, the statewide mean minimum temperature 0.10 °C above average and the mean temperature 0.30 °C above average

Warmer and drier than average for Hobart

  • Total rainfall for Hobart (Ellerslie Road) was 17.4 mm, which is 33% of the long-term average of 53.0 mm
  • Precipitation was recorded on 14 days which was close to the average of 15 days, but only 3 of those days saw more than 1 mm of rain which is a third of the September average of 9 days
  • The mean daily maximum temperature for Hobart (Ellerslie Road) was 16.3 °C, which is 1.2 °C above average. The warmest day was 22.2 °C on the 14th, and the coolest day was on the 23rd when the temperature reached 11.5 °C
  • There were 6 days where the temperature exceeded 20 °C which was triple the September average of 2 days
  • The mean daily minimum temperature for Hobart (Ellerslie Road) was 6.9 °C, which is 0.5 °C above average. The coldest morning was 2.3 °C on the 3rd, and the warmest morning was on the 14th when the minimum temperature was 12.6 °C
  • The minimum temperature dropped below 5 °C on 10 days compared to an average of 9 days, and stayed above 10 °C on 3 days which is right on average for September

 

Further information

Media
(03) 9669 4057
Enquiries

Extremes in September 2018
Hottest day 22.7 °C at Dover on the 11th and at Friendly Beaches on the 18th
Warmest days on average17.1 °C at Friendly Beaches
Coolest days on average4.2 °C at Mount Read
Coldest day-1.1 °C at kunanyi (Mount Wellington Pinnacle) on the 1st
Coldest night-7.5 °C at Liawenee on the 3rd
Coolest nights on average-1.1 °C at kunanyi (Mount Wellington Pinnacle)
Warmest nights on average8.9 °C at Hogan Island
Warmest night13.5 °C at Flinders Island Airport on the 15th
Warmest on average overall11.9 °C at Friendly Beaches
Coolest on average overall2.0 °C at Mount Read
Wettest overall381.0 mm at Mount Read
Wettest day41.4 mm at Mount Read on the 13th
Strongest wind gust159 km/h at Maatsuyker Island Lighthouse on the 12th

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 September total rainfall
New record
(mm)
Old
record
Years of
record
Average for
September
Hobart Airport 8.2 10.5 in 1968 61 40.9
Rotherwood 19.0 20.8 in 1981 47 56.0
Tea Tree (The Point) 13.2 18.4 in 1995 33 48.8
Richmond (Strathayr) 11.4 16.0 in 1999 31 48.4
Yarlington (Blacks Pinnacle) 19.6 25.0 in 2015 24 66.0
Melton Mowbray (North Stockman) 12.2 13.6 in 2014 22 47.9
Woodsdale (Stalworth) 22.0 23.6 in 1999 20 58.2

Lowest September total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
September
Fort Direction 11.1 6.9 in 1951* 40.2
Seven Mile Beach (Royal Hobart Golf Club 9.4 8.4 in 1968 43.1
Opossum Bay 14.6 9.6 in 1978 42.1
Wattle Hill 16.8 11.4 in 1981 50.8
Orford (Aubin Court) 11.8 11.3 in 1981* 51.7
City of Melbourne Bay 48.2 31.4 in 1985 98.9
Huonville (Tutton Avenue) 33.4 23.2 in 1978* 78.3
Fingal (Legge Street) 13.8 4.2 in 1994 49.4

* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported




Summary statistics for September 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
September
2018
Diff
from
average
Highest for
September
2018
Mean for
September
2018
Diff
from
average
Lowest for
September
2018
Total for
September
2018
Average
for
September
Rank of
September
2018
Fraction of
September
average
Northern (district 91)
Cape Grim 13.0   17.3 11th 8.3   3.6 24th 41.2
Cape Grim BAPS (Comparison) 13.4 -0.1 16.9 11th 8.3 -0.3 4.0 24th 37.4 77.5 low 48%
Cressy Research Station 15.0 +0.2 19.1 30th     -2.7 29th 14.6 60.7 lowest 24%
Devonport Airport 14.6 +0.3 18.6 10th 5.8 -0.3 0.3 24th 33.0 74.6 low 44%
Launceston (Ti Tree Bend) 15.9 +0.2 18.5 30th 4.4 -0.8 -1.2 2nd 34.6 65.4 low 53%
Launceston Airport 14.8 -0.4 17.7 30th 3.1 -1.0 -1.8 20th 34.6 56.6 low 61%
Low Head 13.8 -0.2 15.7 14th 8.4 -0.1 3.0 2nd 37.2 60.1 low 62%
Luncheon Hill (Forestry) 12.1 -0.3 16.4 11th 5.0 -0.4 0.2 24th 122.0 171.3 low 71%
Marrawah 13.6 -0.1 17.2 14th 7.4 -0.1 2.5 24th 60.4 103.5 low 58%
Scottsdale (West Minstone Road) 14.0 -0.3 17.3 30th 3.8 -1.0 -1.4 16th 58.4 95.2 low 61%
Sheffield School Farm 12.8 -0.4 17.2 30th 3.9 -0.8 -1.3 24th 55.6 122.1 low 46%
Smithton Aerodrome 14.8 0.0 18.0 27th 5.5 -0.7 -0.4 24th 64.2 99.4 low 65%
Wynyard Airport 14.8 +0.3 17.6 10th 4.0 -1.0 -1.4 24th 43.6 96.8 v low 45%
East Coast (district 92)
Bicheno (Council Depot) 16.5 +0.3 20.8 11th 7.0 -0.4 2.8 20th 21.2 44.1 low 48%
Fingal (Legge Street) 15.7 +0.3 20.2 21st 1.9 -1.4 -4.4 20th 13.8 49.4 v low 28%
Friendly Beaches 17.1 +0.3 22.7 18th 6.8 -0.7 1.5 20th 18.6 40.0 low 47%
Lake Leake (Elizabeth River) 11.8 +0.3 16.2 30th 1.4 -0.6 -3.6 20th 47.6 70.5 low 68%
larapuna (Eddystone Point) 15.8 +1.0 18.7 14th 7.7 -0.2 3.4 16th 31.6 62.6 low 50%
Maria Island (Point Lesueur) 15.2 0.0 20.1 21st 8.4 0.0 4.9 24th 6.0 45.5 v low 13%
Orford (Aubin Court) 16.5 +0.7 21.3 21st 5.3 -0.3 0.0 21st 11.8 51.7 v low 23%
St Helens Aerodrome 15.9 -0.2 19.8 21st 5.9 -0.7 1.4 20th 29.8 51.0 low 58%
Swan Island 14.7 0.0 17.3 27th 8.7 -0.5 4.7 2nd 31.0 53.4 low 58%
Swansea (Francis Street) 16.3   21.2 27th 5.0   0.1 3rd 16.8
Midlands (district 93)
Ross (The Boulevards) 14.2 -0.4 17.7 30th 2.8 -0.9 -3.8 24th 38.6 51.5 average 75%
Southeast (district 94)
Campania (Kincora) 16.2 0.0 21.4 14th 4.9 -0.5 -0.8 29th 12.2 46.0 v low 27%
Cape Bruny (Cape Bruny) 15.1 +0.7 20.9 18th 7.3 -0.2 4.3 16th 39.6 70.5 low 56%
Cape Bruny Lighthouse 14.5 +1.2 20.3 11th 7.6 +0.6 4.0 16th 42.0 80.9 v low 52%
Dennes Point 15.1   20.3 14th 7.4   3.6 26th 13.6
Dover 15.6 +0.9 22.7 11th 5.2 +0.2 0.0 3rd 40.4 83.0 low 49%
Dunalley (Stroud Point) 15.9   21.8 14th 7.7   4.1 29th 8.2
Grove (Research Station) 15.4 0.0 21.4 14th 4.3 -0.1 -1.9 3rd 24.6 77.1 v low 32%
Hobart (Ellerslie Road) 16.3 +1.2 22.2 14th 6.9 +0.5 2.3 3rd 17.4 53.0 v low 33%
Hobart Airport 16.2 +0.8 21.3 14th 6.3 +0.2 0.5 26th 8.2 40.9 lowest 20%
kunanyi (Mount Wellington Pinnacle) 5.5 +0.9 12.4 10th -1.1 0.0 -4.6 16th
Maatsuyker Island Lighthouse 12.1 -0.1 20.3 11th 7.0 +0.1 4.2 2nd 71.6 108.3 low 66%
Melton Mowbray (North Stockman) 14.6 -0.1 19.5 27th 4.0 -0.4 -1.2 3rd 12.2 47.9 lowest 25%
Tasman Island 12.7 0.0 17.9 13th 7.0 0.0 2.9 16th 48.0 77.2 low 62%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 16.4 +0.9 22.0 14th 3.1 -0.9 -1.6 3rd 21.0 53.9 low 39%
Maydena Post Office 13.6 -0.1 20.8 27th 3.3 -0.2 -1.9 26th 72.5 132.9 low 55%
Ouse Fire Station 15.6 -0.1 20.3 14th 3.3 -0.7 -2.3 24th 22.4 67.4 low 33%
Central Plateau (district 96)
Butlers Gorge 10.0 -0.2 15.7 27th 1.5 +0.5 -2.9 27th 125.2 168.8 low 74%
Lake St Clair National Park 9.8 -0.4 15.2 27th 1.5 +0.6 -3.3 3rd 144.2 211.1 low 68%
Liawenee 8.5 -0.5 14.9 30th -0.8 -0.3 -7.5 3rd 90.6 113.7 average 80%
West Coast (district 97)
Cape Sorell 13.9 +0.7 17.1 27th 8.2 +0.3 4.1 26th 76.4 120.9 low 63%
Hartz Mountain (Keoghs Pimple) 8.2 -0.5 17.5 11th 1.3 -0.6 -2.1 16th 67.8 97.7 low 69%
Low Rocky Point 13.6   21.4 11th 7.5   3.1 26th 104.2 130.1 low 80%
Mount Read 4.2 -1.4 10.2 27th -0.3 -0.8 -4.0 24th 381.0 366.9 average 104%
Scotts Peak Dam 12.3 -0.1 21.5 27th 4.0 -0.4 0.4 16th 168.8 215.0 low 79%
Strahan Aerodrome 14.5 +0.1 20.0 27th 6.6 +0.3 0.1 26th 125.8 151.5 low 83%
Warra 11.4 -0.1 18.6 27th 2.5 -1.0 -3.3 26th 134.2 196.0 low 68%
King Island (district 98)
King Island Airport 14.5 -0.2 21.1 11th 8.1 -0.3 2.2 26th 39.2 85.5 v low 46%
Flinders Island (district 99)
Flinders Island Airport 15.2 +0.1 21.0 27th 7.7 +0.1 -0.6 26th 26.6 62.4 low 43%
Hogan Island 14.5 0.0 19.0 14th 8.9 -0.3 4.7 16th 36.8 54.2 average 68%
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 1 October 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