Tasmania in September 2013: a mild start to spring

There was some unseasonably warm weather at the start of September 2013, and despite some very cold temperatures in the middle of the month it was warmer than usual overall, especially at night. Some heavy rain affected the north and northeast, and in most areas it was wetter than usual.

  • above-average temperatures overall
  • record low September temperatures and snow to low levels on the 12th and 13th
  • wetter than usual in most areas
  • strong and gusty winds

Mild days predominate

It was unseasonably warm at the start of September, with temperatures in the low to mid-20s reported at several sites across Tasmania. Dover and Geeveston reached 24.8 °C on the 1st, and several other sites had their warmest day in the first few days of the month. There was over a week of cold weather around the middle of the month, with daytime temperatures hovering in the low teens and some snow down to low levels on the 11th and 12th. This gave way to further mild days at the end of the month. Overall, daytime temperatures were above average for the month, typically by about half to one degree. In general September in Tasmania was warmer than 2012, but not as warm as 2001.

Record cold temperature, but nights mild overall

After the mild start, a burst of cold weather from the 11th to the 14th saw some very low temperatures. Liawenee dropped to -8.8 °C on the morning of the 13th, and a few sites registered their lowest September temperature on record on either the 12th or 13th. There were many more mild nights than cold ones, and the mean daily minimum temperature was over a degree above average across the state. For most sites it was their highest mean daily minimum temperature since at least 2001, and a few (including Launceston) had their highest September mean daily minimum temperature on record.

Some wet days

There were several wet days in different parts of Tasmania during September, especially from the 9th to the 11th and again from the 17th to the 19th. The wettest single day was at Gray (Dalmayne Rd) with 114.0 mm in the 24 hours to 9 am on the 18th. Following the wet August this rain brought some moderate flooding to the upper South Esk River, and some minor flooding in the North Esk.

The western half of the state saw rain on most days, with some moderate to heavy falls. This ensured the wettest confirmed total was 351.8 mm at Lake Margaret Power Station (nearby Mount Read had at least 443 mm but was affected by snow and its true total is not known).

Most sites had more rain than usual during September, although only in patches was it markedly higher than the long-term average.

Windy spring weather

Strong and gusty winds are a common feature of spring in Tasmania, and September 2013 was no exception. On the 26th Hogan Island (in Bass Strait) reported gusts to 161 km/h, Cape Grim (in the northwest) 141 km/h and Flinders Island Airport 120 km/h. The windy weather continued to the end of the month, with Mount Wellington reporting gusts to 120 km/h late on the 29th and Hobart gusting to 81 km/h early on the 30th.

A mild September in Hobart

Despite some cold weather in the middle of the month, Hobart had a very mild September. The mean daily minimum temperature was the warmest it had been since 1988, and at 8.2 ° was 1.8 °C above the long-term average. There were 11 nights when the temperature did not drop below 10 °C in Hobart, the greatest number of such mild September nights recorded and well above the long-term average of about 3 nights. The lowest temperature was a chilly 0.6 °C on the morning of the 13th.

In common with several other places in Tasmania, Hobart's warmest day was on the 1st, when it reached 23.4 °C in the city. Hobart exceeded 20 °C on 9 days, the first time there have been so many such mild days recorded in September. At the other extreme, Hobart managed only 10.1 °C on the 11th and 10.6 °C on the 13th. Overall, the daily maximum temperature averaged to 16.7 °C (1.6 °C above the long-term average).

There were 17 days with at least some rain in Hobart during September, a little above the long-term average of 15 rainy days. Most of these saw only slight falls, and the 40.0 mm total for the month is below the average of 53 mm. East of the city, Hobart Airport recorded only 24 mm for the whole month, against a long-term average of 42 mm.

Strong and gusty winds occurred several times during the month, with gusts over 70 km/h recorded in the city on 6 days, reaching a peak of 81 km/h early on the 30th. These values are fairly typical for the time of year.

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Extremes in September 2013
Hottest day 24.8 °C at Dover and at Geeveston (Cemetery Road) on the 1st
Warmest days on average 17.5 °C at Friendly Beaches
Coolest days on average 6.4 °C at Mount Wellington
Coldest day -3.1 °C at Mount Wellington on the 11th
Coldest night -8.8 °C at Liawenee on the 13th
Coolest nights on average 0.3 °C at Mount Wellington
Warmest nights on average 10.5 °C at Swan Island
Warmest night 14.7 °C at Flinders Island Airport on the 24th
Warmest on average overall 13.0 °C at King Island Airport
Coolest on average overall 3.4 °C at Mount Wellington
Wettest overall 351.8 mm at Lake Margaret Power Station*
Driest overall 24.2 mm at Hobart Airport (Office)
Wettest day 114.0 mm at Gray (Dalmayne Rd) on the 18th
Highest wind gust 161 km/h at Hogan Island on the 26th

* note: Mount Read recorded at least 443 mm but was affected by snow and its true total is not known


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 highest total September rainfall
Total rainfall
for September 2013 (mm)
Previous wettest
for September
Years of
record
Average for
September
Three Hummock Island 125.8 106.4 in 2009* 21 77.4
* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.


Record lowest September daily maximum temperature
Lowest daily maximum
temperature
in September 2013 (°C)
Previous coolest
for September
Years of
record
Average for
September
Cape Grim BAPS (Comparison) 10.0 on the 11th = 10.0 on the 28th in 2010 21 13.4



Record highest September mean daily maximum temperature
Mean daily maximum
temperature
for September 2013 (°C)
Previous warmest
for September
Years of
record
Average for
September
Cape Sorell 15.2 14.6 in 1961* 72 13.1
* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.


Record lowest September temperature
Lowest temperature
in September 2013 (°C)
Previous coolest
for September
Years of
record
Average for
September
Bushy Park (Bushy Park Estates) -3.7 on the 13th = -3.7 on the 4th in 2008 52 3.9
Butlers Gorge -6.0 on the 12th = -6.0 on the 4th in 1993 40 1.0
Geeveston (Cemetery Road) -4.6 on the 13th -3.6 on the 9th in 1992 27 4.5
Lake Leake (Elizabeth River) -6.9 on the 13th -6.3 on the 4th in 2008 24 2.0
Bull Bay (Lauriston) 0.4 on the 12th 0.8 on the 5th in 1995 21 6.7
Ross (The Boulevards) -6.2 on the 13th -5.2 on the 8th in 2003 20 3.7



Record highest September mean daily minimum temperature
Mean daily minimum
temperature
for September 2013 (°C)
Previous warmest
for September
Years of
record
Average for
September
Launceston (Ti Tree Bend) 6.9 6.5 in 2001 30 5.2
Wynyard Airport 6.8 6.6 in 2001 25 4.9
Devonport Airport 7.7 7.5 in 2001 21 6.1
Maydena Post Office 4.8 4.2 in 2000 20 3.4

Highest September mean daily minimum temperature for at least 20 years
Mean daily minimum
temperature
for September 2013 (°C)
Most recent September
at least this warm
Years since
warmer
Average for
September
Cape Sorell 9.1 9.4 in 1937* 36 7.9
Bushy Park (Bushy Park Estates) 5.1 5.5 in 1987 26 3.9
Flinders Island Airport 9.5 9.8 in 1988 25 7.6
Hobart (Ellerslie Road) 8.2 8.3 in 1988 25 6.4

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




Record highest September mean temperature
Mean daily
temperature
for September 2013 (°C)
Previous warmest
for September
Years of
record
Average for
September
Cape Sorell 12.1 11.9 in 1921* 72 10.5
Butlers Gorge 6.9 6.8 in 1972 52 5.5
Launceston (Ti Tree Bend) 11.8 11.6 in 2001 30 10.4
Devonport Airport 11.4 = 11.4 in 2001 21 10.1

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


Highest September mean temperature for at least 20 years
Mean daily
temperature
for September 2013 (°C)
Most recent September
at least this warm
Years since
warmer
Average for
September
Flinders Island Airport 12.9 13.0 in 1988 25 11.3



Summary statistics for September 2013
Maximum temperatures
for September
(°C)
Minimum temperatures
for September
(°C)
Rainfall
for September
(millimetres)
Mean for
September
2013
Diff
from
average
Highest for
September
2013
Mean for
September
2013
Diff
from
average
Lowest for
September
2013
Total for
September
2013
Average
for
September
Rank of
September
2013
Fraction of
September
average
Northern (district 91)
Bridport (Sea View Villas) 15.2 +0.5 18.1 1st 7.6 +0.8 1.6 12th 76.1 74.4 average 102%
Burnie (Round Hill) 15.1 +0.8 19.1 1st 8.5 +1.7 2.8 12th 153.8 88.9 v high 173%
Burnie NTC AWS 14.2   17.4 5th 9.0   4.1 12th
Cape Grim 13.9   17.3 4th 9.6   3.0 13th 98.0
Cape Grim BAPS (Comparison) 14.2 +0.8 17.4 2nd 9.5 +0.9 3.2 13th 93.4 77.9 average 120%
Cressy Research Station 15.5 +0.8 20.0 3rd 6.0 +2.0 -3.7 13th 90.6 65.4 high 139%
Devonport Airport 15.0 +0.8 18.8 20th 7.7 +1.6 1.2 12th 98.6 75.4 high 131%
Launceston (Ti Tree Bend) 16.7 +1.2 20.9 2nd 6.9 +1.7 -0.3 13th 90.8 67.1 high 135%
Launceston Airport 15.8   19.8 2nd 5.5   -2.0 13th 76.6 59.3 high 129%
Low Head 14.4 +0.4 17.0 1st 9.7 +1.2 4.2 12th 67.6 65.3 average 104%
Marrawah 14.4 +0.7 18.2 1st 8.9 +1.5 2.5 12th 107.0 105.3 average 102%
Scottsdale (West Minstone Road) 15.0 +0.8 19.2 3rd 6.3 +1.6 0.6 13th 131.6 98.9 high 133%
Sheffield School Farm 13.7 +0.6 18.4 2nd 5.9 +1.2 -0.7 12th 176.2 128.3 high 137%
Smithton Aerodrome 15.4 +0.6 19.1 22nd 7.9 +1.7 0.0 13th 100.4 103.6 average 97%
Wynyard Airport 15.0 +0.6 18.6 1st 6.8 +1.9 -0.4 12th 142.4 97.3 high 146%
East Coast (district 92)
Bicheno (Council Depot) 17.2 +1.1 24.3 30th 8.6 +1.2 1.6 13th 53.6 44.5 high 120%
Fingal (Legge Street) 16.0 +0.7 20.9 24th 4.8 +1.6 -5.7 13th 52.2 49.5 average 105%
Friendly Beaches 17.5 +0.8 23.8 30th 8.3 +0.8 -1.0 13th
Lake Leake (Elizabeth River) 12.2 +0.9 17.7 30th 3.2 +1.2 -6.9 13th 83.7 71.0 average 118%
Larapuna (Eddystone Point) 16.3 +1.4 19.5 30th 9.6 +1.6 3.5 13th 72.6 63.3 average 115%
Maria Island (Point Lesueur) 15.6   21.4 24th 9.2   2.8 12th 49.4 50.1 high 99%
Orford (Aubin Court) 16.5 +0.8 22.7 30th 7.1 +1.5 -1.5 13th 63.4 51.8 high 122%
Spring Bay NTC AWS 15.8   21.1 24th 8.8   1.2 13th
St Helens Aerodrome 16.7 +0.8 20.3 5th 8.0 +1.4 0.1 13th 54.4 52.8 average 103%
Swan Island 14.9 +0.4 18.0 2nd 10.5 +1.5 5.3 12th 58.4 59.5 average 98%
Swansea (Francis Street) 17.0   23.2 30th 7.1   -2.1 13th 38.0
Midlands (district 93)
Ross (The Boulevards) 15.2 +0.8 20.7 3rd 4.9 +1.2 -6.2 13th 40.2 53.9 average 75%
Southeast (district 94)
Bull Bay (Lauriston)     21.0 24th 8.1 +1.4 0.4 12th 74.8 56.3 high 133%
Campania (Kincora) 16.6 +0.5 22.2 30th 6.4 +1.1 -3.5 13th 37.4 48.9 average 76%
Cape Bruny (Cape Bruny) 15.3 +1.0 23.4 1st 8.3 +0.9 1.7 12th 113.8 74.6 high 153%
Cape Bruny Lighthouse 14.8 +1.6 22.9 1st 8.2 +1.2 1.8 12th 112.8 81.7 high 138%
Dennes Point 15.6   21.3 30th 8.8   1.2 12th 65.8
Dover 15.7 +1.1 24.8 1st 6.5 +1.6 -1.8 13th 105.2 84.4 high 125%
Dunalley (Stroud Point) 15.6   21.7 30th 8.6   2.0 12th 64.4
Geeveston (Cemetery Road) 15.8 +1.1 24.8 1st 5.1 +0.6 -4.6 13th 87.4 93.9 average 93%
Grove (Research Station) 16.0   23.4 1st 5.6   -2.4 13th 53.4 88.6 low 60%
Hobart (Ellerslie Road) 16.7 +1.6 23.4 1st 8.2 +1.8 0.6 13th 40.0 53.4 average 75%
Hobart Airport 16.5 +1.2 22.6 30th 7.6 +1.6 0.0 13th 24.4 41.9 low 58%
Maatsuyker Island Lighthouse 13.6 +1.4 23.6 4th 8.5 +1.7 2.5 11th 111.8 109.5 average 102%
Melton Mowbray (North Stockman) 15.3 +0.8 21.9 1st 5.4 +1.0 -4.2 13th 41.4 53.0 average 78%
Mount Wellington 6.4 +2.0 13.3 1st 0.3 +1.6 -6.1 12th
Tasman Island 13.3 +0.8 18.6 30th 8.0 +1.3 0.6 12th 96.2 88.8 average 108%
Tunnack Fire Station 13.3 +0.9 19.3 30th 4.1 +0.8 -6.5 13th 55.4 65.5 average 85%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 16.7 +1.3 24.4 1st 5.1 +1.2 -3.7 13th 39.4 54.4 average 72%
Maydena Post Office 14.3 +0.7 22.9 1st 4.8 +1.4 -2.1 13th 124.0 142.5 low 87%
Ouse Fire Station 16.1 +0.5 23.4 1st 5.3 +1.5 -4.1 13th 85.6 74.1 average 116%
Central Plateau (district 96)
Butlers Gorge 11.4 +1.3 18.5 1st 2.4 +1.4 -6.0 12th 201.8 171.0 average 118%
Lake St Clair National Park 11.2 +1.2 18.2 3rd 2.4 +1.5 -5.9 13th 255.4 221.6 average 115%
Liawenee 9.6 +0.9 17.1 3rd 1.0 +1.6 -8.8 13th
West Coast (district 97)
Cape Sorell 15.2 +2.1 19.6 4th 9.1 +1.2 2.7 12th 96.0 122.8 low 78%
Hartz Mountain (Keoghs Pimple) 9.7 +1.2 18.2 4th 2.7 +0.9 -3.4 11th
Low Rocky Point 15.1   24.3 4th 8.1   1.1 12th 106.0 138.6 low 76%
Mount Read 6.7 +1.3 15.5 3rd 1.4 +1.1 -5.1 12th
Scotts Peak Dam 14.0 +1.9 23.1 4th 5.2 +0.9 -1.4 12th 228.6 226.8 average 101%
Strahan Aerodrome 15.7 +1.4 23.5 1st 7.3 +1.1 -1.0 13th 149.2 156.1 average 96%
Warra 12.3   20.8 1st 4.0   -4.3 13th 212.2
King Island (district 98)
King Island Airport 16.0 +1.4 23.0 1st 10.1 +1.8 4.1 13th 106.8 88.0 high 121%
Flinders Island (district 99)
Flinders Island Airport 16.3 +1.2 23.2 4th 9.5 +1.9 -1.2 13th 69.4 63.9 average 109%
Antarctica and Macquarie Island (district 300)
Macquarie Island 5.2 -0.2 7.4 28th 1.6 +0.1 -5.0 13th 63.8 74.6 average 86%

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.

This statement has been prepared based on information available at 10 am on Tuesday 1 October 2013. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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.

 

Further information

Media
(03) 9669 4057
Enquiries