Tasmania in September 2017: a cool start to spring

Tasmania had a cool September, especially early in the month when there were several days with snow to low levels. The eastern third of the State had another relatively dry month, but rain was above average in the west.

A cool start to spring

  • Cold weather was dominant in Tasmania throughout the month, ensuring it was the State's coolest September since 2003
  • Cold outbreaks saw snow fall on the mountains several times during the month along with strong and gusty winds (including on the 30th), with snow settling to low levels from the 4th to the 6th, and again on the 8th and 9th
  • Some sites with relatively short record had their coldest September day on record on the 4th or 5th, and kunanyi / Mount Wellington had its coldest temperature of the year on the morning of the 5th
  • The main warm spells were on the 18th, and again from the 21st to the 23rd; although Tasmania escaped the heat that affected the eastern mainland Bridport did have its highest September temperature on record on the 23rd
  • The statewide mean maximum temperature was 0.74 °C below average (the coolest since 2010) and the mean minimum temperature was 0.64 °C below average (the coolest since 2003), giving a mean temperature 0.68 °C below average (the coolest since 2003)
  • Tasmania was the only State to record a below-average statewide mean temperature in September

Another dry month in eastern Tasmania

  • September was another month with below-average rain in the eastern third of Tasmania, with totals below 10 mm at some East Coast sites
  • Westerly winds and cold fronts meant rainfall totals were above average in the western highlands
  • Total rainfall for the State was about 16% above average

Cold nights for Hobart

  • The mean daily maximum temperature for Hobart (Ellerslie Road) was 15.1 °C, equal to the long-term average
  • After recording only 9.3 °C on the 5th, Hobart reached 21.4 °C on the 18th (the warmest day since autumn) then reached 22.3 °C on the 21st
  • The mean daily minimum temperature for Hobart (Ellerslie Road) was 5.8 °C, which is 0.6 °C below the long-term average and the coolest for September since 2003
  • Hobart's coldest temperature for the month was 1.0 °C on the morning of the 1st
  • Total rainfall for Hobart was 46.2 mm, a little below the long-term average of 53.2 mm

Further information

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Extremes in September 2017
Hottest day 24.6 °C at Flinders Island Airport on the 23rd
Warmest days on average 16.6 °C at Friendly Beaches
Coolest days on average 3.3 °C at Mount Read
Coldest day -3.0 °C at kunanyi (Mount Wellington Pinnacle) on the 8th
Coldest night -8.0 °C at Liawenee on the 1st
Coolest nights on average -2.2 °C at kunanyi (Mount Wellington Pinnacle)
Warmest nights on average 8.4 °C at Swan Island
Warmest night 13.2 °C at Flinders Island Airport on the 3rd
Warmest on average overall 11.6 °C at Bicheno (Council Depot)
Coolest on average overall 0.8 °C at kunanyi (Mount Wellington Pinnacle)
Wettest overall 461.4 mm at Mount Read
Driest overall 9.1 mm at Bicheno (Council Depot)
Wettest day 51.2 mm at Mount Read on the 24th
Strongest wind gust 159 km/h at Cape Grim BAPS (Comparison) on the 29th

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


Highest September total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
September
Butlers Gorge 305.0 451.8 in 1980* 169.5

* note: there is a 19-year gap in the historical record at Butlers Gorge from 1999 to 2007, so it is possible a higher value has gone unreported




Record highest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Bridport (Sea View Villas) 21.5 on the 23rd 20.5 on the 30th in 2001 22 14.9



Record lowest September daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Cape Grim BAPS (Comparison) 9.1 on the 4th 9.8 on the 22nd in 2015 25 13.5
Luncheon Hill (Forestry) 5.6 on the 4th 5.9 on the 15th in 1998 22 12.5
Cape Bruny (Cape Bruny) 8.4 on the 5th = 8.4 on the 15th in 2010 21 14.5
Mount Read -1.9 on the 4th -1.6 on the 19th in 2002 21 5.7
Sheffield School Farm 6.4 on the 5th 7.0 on the 9th in 2002 21 13.3
Smithton Aerodrome 9.2 on the 4th 9.7 on the 15th in 1998 21 14.9
Low Head 9.8 on the 5th = 9.8 on the 15th in 1998 20 14.1
Ouse Fire Station 7.4 on the 5th 8.0 on the 9th in 2002 20 15.8



Record lowest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Ouse Fire Station -4.8 on the 1st -4.3 on the 8th in 2003 20 4.0



Lowest September mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
September
Burnie (Round Hill) 5.5 4.5 in 1970 6.9
Cape Grim BAPS (Comparison) 7.8 7.0 in 1992* 8.6

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




Lowest September mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
September
Burnie (Round Hill) 9.6 8.6 in 1970 10.6
Cape Grim BAPS (Comparison) 10.2 9.5 in 1992* 11.1

* 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 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
September
2017
Diff
from
average
Highest for
September
2017
Mean for
September
2017
Diff
from
average
Lowest for
September
2017
Total for
September
2017
Average
for
September
Rank of
September
2017
Fraction of
September
average
Northern (district 91)
Burnie (Round Hill) 13.7 -0.7 16.6 23rd 5.5 -1.4 2.1 5th 119.2 88.7 high 134%
Cape Grim 12.4   15.2 21st 7.9   3.5 5th 108.6
Cape Grim BAPS (Comparison) 12.6 -0.9 15.9 21st 7.8 -0.8 3.5 5th 114.2 78.8 high 145%
Cressy Research Station 13.7 -1.2 16.9 18th 2.5 -1.6 -2.9 1st 61.2 63.1 average 97%
Devonport Airport 13.7 -0.6 17.4 23rd 5.4 -0.8 0.9 17th 92.0 75.2 average 122%
Launceston (Ti Tree Bend) 14.7 -1.0 17.6 18th 4.0 -1.3 -1.2 9th        
Launceston Airport 13.9 -1.4 17.5 21st 2.3 -1.9 -3.4 8th 50.4 58.1 low 87%
Low Head 13.0 -1.1 17.2 23rd 8.0 -0.5 3.1 17th 49.6 61.3 low 81%
Luncheon Hill (Forestry) 10.3 -2.2 15.2 22nd 4.4 -1.1 0.1 5th 239.0 173.6 high 138%
Marrawah 12.7 -1.0 15.2 22nd 7.1 -0.4 3.0 5th 140.4 104.4 high 134%
Scottsdale (West Minstone Road) 13.3 -1.0 20.8 23rd 3.6 -1.2 -2.2 9th 60.0 95.9 low 63%
Sheffield School Farm 11.3 -2.0 14.5 10th 3.4 -1.4 -0.4 5th 116.2 125.3 low 93%
Smithton Aerodrome 13.6 -1.3 17.5 21st 5.5 -0.7 0.9 17th 128.0 101.0 high 127%
Wynyard Airport 13.6 -0.9 16.6 21st 3.7 -1.3 -0.5 9th 132.6 98.0 high 135%
East Coast (district 92)
Bicheno (Council Depot) 16.4 +0.2 19.9 23rd 6.7 -0.8 2.6 20th 9.1 44.4 v low 20%
Fingal (Legge Street) 14.9 -0.5 20.8 23rd 1.8 -1.5 -3.9 5th 19.0 49.6 low 38%
Friendly Beaches 16.6 -0.2 22.6 21st 6.2 -1.4 1.8 5th 14.2 41.2 v low 34%
Lake Leake (Elizabeth River) 10.9 -0.6 15.9 22nd 1.0 -1.1 -5.1 1st 45.2 70.7 low 64%
larapuna (Eddystone Point) 15.2 +0.4 18.1 22nd 6.8 -1.1 1.6 8th 27.6 62.9 low 44%
Maria Island (Point Lesueur) 14.5 -0.7 18.5 3rd 7.2 -1.3 3.2 5th 24.8 48.3 low 51%
Orford (Aubin Court) 15.4 -0.4 21.7 3rd 4.8 -0.8 -1.2 1st 27.0 52.4 low 52%
St Helens Aerodrome 16.0 -0.1 20.0 23rd 5.4 -1.3 0.2 8th 13.2 52.3 v low 25%
Swan Island 14.0 -0.7 17.4 23rd 8.4 -0.8 4.1 17th 23.4 55.0 v low 43%
Swansea (Francis Street) 16.1   21.8 18th 4.9   -0.6 20th 9.3
Midlands (district 93)
Ross (The Boulevards) 13.9 -0.7 18.1 21st 2.7 -1.1 -4.2 1st 32.2 52.0 average 62%
Southeast (district 94)
Campania (Kincora) 15.4 -0.8 21.6 21st 4.3 -1.1 -2.3 1st 35.2 48.0 average 73%
Cape Bruny (Cape Bruny) 13.5 -1.0 20.8 18th 6.0 -1.6 1.8 5th 103.0 71.9 high 143%
Cape Bruny Lighthouse 12.9 -0.4 20.2 18th 5.9 -1.1 0.8 30th 107.6 81.1 high 133%
Dennes Point 13.8   21.8 21st 6.4   3.0 8th 45.8
Dover 13.8 -1.0 21.2 21st 3.9 -1.2 -1.5 1st 114.0 83.5 high 137%
Dunalley (Stroud Point) 14.6   21.3 3rd 6.6   2.9 1st 34.8
Grove (Research Station) 14.1 -1.4 21.8 21st 3.4 -1.0 -2.5 1st 74.6 80.7 average 92%
Hobart (Ellerslie Road) 15.1 0.0 22.3 21st 5.8 -0.6 1.0 1st 46.2 53.2 average 87%
Hobart Airport 15.3 -0.1 22.2 21st 5.3 -0.8 0.1 1st 30.8 41.4 average 74%
kunanyi (Mount Wellington Pinnacle) 3.8 -0.8 10.8 21st -2.2 -1.1 -6.4 5th 40.0 72.8 low 55%
Maatsuyker Island Lighthouse 11.1 -1.1 17.8 18th 6.0 -0.9 2.2 5th 106.0 108.6 average 98%
Melton Mowbray (North Stockman) 13.7 -1.0 21.9 21st 3.3 -1.1 -3.2 1st 46.2 49.6 average 93%
Tasman Island 11.8 -0.9 18.1 3rd 5.5 -1.5 1.1 8th 63.0 79.1 average 80%
Tunnack Fire Station 11.4 -1.2 15.4 22nd 2.1 -1.3 -3.3 20th 35.0 61.0 low 57%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 14.5 -1.0 21.5 21st 3.6 -0.4 -3.6 1st 77.6 54.1 high 143%
Maydena Post Office 11.8 -2.0 20.5 21st 2.4 -1.2 -1.9 1st 192.0 135.3 high 142%
Ouse Fire Station 13.8 -2.0 20.7 21st 3.4 -0.6 -4.8 1st 112.2 69.6 high 161%
Central Plateau (district 96)
Butlers Gorge 8.2 -2.0 15.1 22nd 0.7 -0.3 -4.8 1st 305.0 169.5 v high 180%
Liawenee 7.4 -1.7 14.7 22nd -1.3 -0.9 -8.0 1st 109.4 115.1 average 95%
West Coast (district 97)
Cape Sorell 13.0 -0.2 16.7 22nd 7.5 -0.4 4.5 9th 140.0 121.4 average 115%
Hartz Mountain (Keoghs Pimple) 6.5 -2.3 14.6 18th 0.4 -1.6 -3.1 5th 141.0 99.3 v high 142%
Low Rocky Point 12.6   17.7 18th 6.8   3.1 1st 150.6 131.4 average 115%
Mount Read 3.3 -2.4 8.9 22nd -1.1 -1.7 -4.8 5th 461.4 366.1 average 126%
Scotts Peak Dam 10.5 -2.0 20.2 2nd 3.0 -1.5 -0.7 1st 332.8 217.6 v high 153%
Strahan Aerodrome 13.4 -1.0 18.9 2nd 6.2 -0.1 1.1 1st 200.8 152.4 high 132%
Warra 10.1 -1.6 18.8 18th 2.1 -1.5 -3.7 1st 327.8 200.8 v high 163%
King Island (district 98)
King Island Airport 14.2 -0.5 18.3 23rd 8.1 -0.3 4.4 5th 84.2 86.5 average 97%
Flinders Island (district 99)
Flinders Island Airport 15.1 0.0 24.6 23rd 7.6 0.0 1.0 17th 58.4 62.9 average 93%
Hogan Island 14.2 -0.4 23.3 23rd 8.0 -1.3 2.2 5th 113.4 55.4 v high 205%
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 2 October 2017. 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