Tasmania in September 2019: a month of contrasts

September was a month of contrasts in Tasmania. While some areas in the east had a record wet day, it was a relatively dry month across much of the State. There were some cold and frosty nights and snow in elevated areas, but also some very warm days, particularly during the third week of the month. The passage of several cold fronts brought strong, gusty and damaging winds.

Heavy rain in the east, but below average totals elsewhere

  • A low pressure system brought moderate to locally heavy rainfall to the Northwest Coast on the 6th, and heavy falls to parts of the East Coast from the 6th to the 7th
  • Thunderstorms associated with the low brought localised flash flooding in the north, and a handful of sites in the east had their highest September daily rainfall on record; marked river rises and some minor flooding was reported in northeast river basins
  • Rainfall was below average over most of the State, and very much below average in a few patches, but close to average in the western highlands
  • Cape Bruny had its driest September since 1999, but for most of the State it was wetter than September last year
  • Tasmania's total rainfall for the month was about 25% below average
  • Rainfall totals for the year remain below average in the eastern half of the State, tending to very much below average in some areas, with totals in the west being close to or above average

A mix of cold and warm; temperatures above average overall

  • Cold, cloudy and wet weather from a low that passed over the State on the 6th saw many sites struggling to reach 10 °C, and gave Fingal and Friendly Beaches their coldest September day on record
  • There was a spell of mild weather from the 10th, before a cold change on the 16th, followed by clear skies and light winds under a high pressure system, resulted in several sites in the north reporting their lowest September temperature on record on either the 17th or 18th
  • The warmest days in most areas were from the 19th to the 21st in northerly winds between a high over the Tasman Sea and a cold front approaching from the west
  • The morning of the 20th was quite warm (Strahan had its highest September daily minimum temperature on record), and that afternoon a few sites had their highest September temperature on record
  • Mean maximum temperatures were above average at most sites, with the State mean maximum temperature 0.56 °C above average
  • Mean minimum temperatures were above average for most of Tasmania, but up to a degree below average in the northeast quarter; the State mean minimum temperature was 0.11 °C above average
  • Temperatures for the year so far are very much above average for most of the State, with maximum temperatures particularly warm

Strong winds and snow

  • There were several days with strong and gusty westerly winds, particularly overnight from the 11th to the 12th when gusts in excess of 100 km/h were reported in and around Hobart, causing structural damage, downed trees and power outages
  • A cold front that crossed late on the 8th brought snow to elevated areas, another front on the 16th brought snow to low levels, and there was more snow in elevated areas on the 21st and 22nd

A mixed month for Hobart

  • Total rainfall for Hobart (Ellerslie Road) was 34.6 mm, which is about two-thirds of the long-term average
  • The mean daily maximum temperature for Hobart (Ellerslie Road) was 16.7 °C, which is 1.6 °C above the long-term average
  • The warmest day was 27.2 °C on the 20th (the warmest day since April), whilst the coolest day was on the 7th when the temperature reached just 9.9 °C
  • The mean daily minimum temperature for Hobart (Ellerslie Road) was 7.2 °C, which is 0.8 °C above the long-term average
  • The coldest morning was 1.4 °C on the 17th (the coldest September morning since 2017), and the warmest morning was on the 15th when the minimum temperature was 12.8 °C
  • Hobart registered a wind gust to 113 km/h early on the 12th, its strongest September gust since 1995 (although a stronger gust occurred on 20 August this year)

 

Further information

Media
(03) 9669 4057
Enquiries

Extremes in September 2019
Hottest day 27.2 °C at Hobart (Ellerslie Road) on the 20th
Warmest days on average 17.0 °C at Friendly Beaches
Coolest days on average 6.2 °C at kunanyi (Mount Wellington Pinnacle)
Coldest day -1.2 °C at kunanyi (Mount Wellington Pinnacle) on the 16th
Coldest night -6.8 °C at Liawenee on the 17th
Coolest nights on average -0.7 °C at kunanyi (Mount Wellington Pinnacle)
Warmest nights on average 9.1 °C at Hogan Island
Warmest night 15.5 °C at Strahan Aerodrome on the 20th
Warmest on average overall 12.0 °C at Hobart (Ellerslie Road) and Friendly Beaches
Coolest on average overall 2.7 °C at kunanyi (Mount Wellington Pinnacle)
Wettest overall 342.8 mm at Mount Read
Wettest day 158.6 mm at Gray (Dalmayne Rd) on the 7th
Strongest wind gust 154 km/h at kunanyi (Mount Wellington Pinnacle) 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 highest September daily rainfall
New record
(mm)
Old
record
Years of
record
Fingal (Legge Street) 74.0 on the 7th 67.8 on the 30th in 2016 121
Lewis Hill (St Pauls River) 84.2 on the 7th 79.8 on the 4th in 1975 90
Friendly Beaches 73.0 on the 7th 52.2 on the 23rd in 2009 23



Lowest September total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
September
Cape Bruny (Cape Bruny) 37.0 24.2 in 1999 69.0

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




Record highest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Lake Leake (Elizabeth River) 22.1 on the 20th 21.2 on the 14th in 2015 30 11.5
Ross (The Boulevards) 22.6 on the 20th 22.4 on the 14th in 2015 26 14.5
Cressy Research Station 22.0 on the 20th = 22.0 on the 15th in 2002 21 14.8



Record lowest September daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Fingal (Legge Street) 8.5 on the 7th 8.6 on the 18th in 1992 34 15.4
Friendly Beaches 9.3 on the 7th 9.9 on the 12th in 2005 23 16.8



Record highest September daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Strahan Aerodrome 15.5 on the 20th 13.7 on the 9th in 2005 28 6.3
Cape Sorell 14.1 on the 20th 13.5 on the 24th in 2014 23 7.9



Record lowest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Ross (The Boulevards) -6.4 on the 17th -6.2 on the 13th in 2013 26 3.7
King Island Airport -0.7 on the 18th 0.2 on the 11th in 2006 25 8.4
Sheffield School Farm -2.1 on the 17th -1.8 on the 3rd in 2008 23 4.7
Low Head 1.4 on the 17th 1.9 on the 1st in 2003 22 8.5
Cressy Research Station -4.8 on the 17th -4.4 on the 4th in 2008 21 3.9



Summary statistics for September 2019
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
September
2019
Diff
from
average
Highest for
September
2019
Mean for
September
2019
Diff
from
average
Lowest for
September
2019
Total for
September
2019
Average
for
September
Rank of
September
2019
Fraction of
September
average
Northern (district 91)
Cape Grim 12.7   17.0 20th 8.6   3.8 17th 72.0
Cape Grim BAPS (Comparison) 13.1 -0.4 17.4 20th 8.6 0.0 4.3 17th 74.0 77.4 average 96%
Cressy Research Station 15.6 +0.8 22.0 20th 2.9 -1.0 -4.8 17th 34.8 59.5 low 58%
Devonport Airport 14.5 +0.2 18.7 20th 5.5 -0.6 -0.9 17th 47.0 74.2 low 63%
Launceston (Ti Tree Bend) 16.6 +0.9 23.8 20th 4.8 -0.4 -0.8 10th 42.6 65.0 low 66%
Launceston Airport 15.5 +0.4 23.4 20th 3.1 -0.9 -3.2 17th 40.6 55.6 low 73%
Low Head 13.8 -0.2 16.7 20th 7.7 -0.8 1.4 17th 33.4 58.9 low 57%
Luncheon Hill (Forestry) 12.8 +0.4 21.1 20th 5.5 +0.1 0.7 17th 117.0 169.1 low 69%
Marrawah 13.8 +0.1 19.3 20th 7.9 +0.4 2.7 17th 141.2 104.3 high 135%
Scottsdale (West Minstone Road) 14.6 +0.3 21.3 20th 3.8 -1.0 -2.3 17th 52.8 94.2 low 56%
Sheffield School Farm 13.6 +0.4 19.3 20th 4.1 -0.6 -2.1 17th 57.2 119.3 low 48%
Smithton Aerodrome 14.7 -0.1 20.5 20th 6.0 -0.2 -1.5 17th 86.2 98.8 average 87%
Wynyard Airport 15.0 +0.5 18.3 11th 4.5 -0.4 -2.2 17th 45.6 95.7 low 48%
East Coast (district 92)
Fingal (Legge Street) 16.2 +0.8 22.2 21st 2.5 -0.7 -5.1 17th 107.2 49.8 v high 215%
Friendly Beaches 17.0 +0.2 22.7 11th 7.2 -0.3 1.9 10th 100.2 42.9 v high 234%
Lake Leake (Elizabeth River) 12.7 +1.2 22.1 20th 1.6 -0.4 -6.3 17th 86.2 70.6 high 122%
larapuna (Eddystone Point) 15.8 +1.0 20.1 12th 7.6 -0.3 4.0 17th 116.2 63.1 v high 184%
Maria Island (Point Lesueur) 14.8 -0.4 18.9 11th 8.2 -0.2 4.3 17th 57.0 46.2 high 123%
Orford (Aubin Court) 16.1 +0.3 23.2 11th 5.5 -0.1 0.7 10th 74.8 52.1 high 144%
St Helens Aerodrome 16.4 +0.3 20.9 12th 6.1 -0.5 -0.3 17th 113.6 54.5 high 208%
Swan Island 14.5 -0.2 18.4 19th 8.9 -0.3 4.5 17th 55.4 53.5 average 104%
Swansea (Francis Street) 16.2   22.8 11th 5.9   -0.6 17th 73.4
Midlands (district 93)
Ross (The Boulevards) 15.2 +0.7 22.6 20th 2.7 -1.0 -6.4 17th 30.2 50.6 low 60%
Southeast (district 94)
Campania (Kincora) 16.9 +0.7 25.7 20th 5.5 +0.1 -0.8 6th 16.8 44.5 v low 38%
Cape Bruny (Cape Bruny) 14.7 +0.3 23.0 20th 7.5 0.0 4.1 17th 37.0 69.0 v low 54%
Cape Bruny Lighthouse 14.2 +0.9 22.5 20th 7.9 +0.9 4.0 9th 37.4 80.6 v low 46%
Dennes Point 15.0   22.0 11th 7.7   3.5 19th 21.8
Dover 15.6 +0.8 26.0 20th 5.3 +0.3 -1.0 17th 54.8 82.7 low 66%
Dunalley (Stroud Point) 15.1   21.0 11th 8.0   4.2 17th 32.4
Grove (Research Station) 15.7 +0.3 25.9 20th 4.4 +0.1 -2.8 17th 45.4 75.4 low 60%
Hobart (Ellerslie Road) 16.7 +1.6 27.2 20th 7.2 +0.8 1.4 17th 34.6 52.8 average 66%
Hobart Airport 16.5 +1.1 26.5 20th 6.6 +0.5 2.3 6th 15.6 40.5 v low 39%
kunanyi (Mount Wellington Pinnacle) 6.2 +1.6 16.4 20th -0.7 +0.4 -5.2 17th 61.6 72.4 average 85%
Maatsuyker Island Lighthouse 11.8 -0.4 22.4 20th 7.5 +0.6 2.9 17th 73.0 108.1 low 68%
Melton Mowbray (North Stockman) 15.2 +0.5 23.9 20th 4.4 0.0 -1.1 6th 26.2 47.0 low 56%
Tasman Island 12.4 -0.3 19.1 11th 7.2 +0.2 3.4 17th 19.6 74.0 v low 26%
Tunnack Fire Station 13.3 +0.8 20.2 20th 2.6 -0.7 -3.6 17th 50.0 58.0 average 86%
Derwent Valley (district 95)
Bushy Park (Bushy Park Estates) 16.3 +0.8 25.6 20th 4.3 +0.4 -2.1 17th 22.2 53.7 low 41%
Maydena Post Office 13.6 -0.1 23.8 20th 4.0 +0.5 -1.6 19th 95.4 131.5 average 73%
Ouse Fire Station 15.8 +0.1 23.6 20th 4.2 +0.3 -2.2 19th 25.0 65.5 low 38%
Central Plateau (district 96)
Butlers Gorge 10.5 +0.3 18.0 21st 1.9 +0.9 -4.4 19th 155.8 168.7 average 92%
Lake St Clair National Park 10.8 +0.7 18.5 20th 1.5 +0.5 -4.1 17th 154.2 209.2 average 74%
Liawenee 9.9 +0.9 16.7 20th 0.0 +0.5 -6.8 17th 55.8 110.5 low 50%
West Coast (district 97)
Cape Sorell 14.1 +0.9 19.7 20th 8.8 +0.9 4.4 17th 83.4 120.5 low 69%
Hartz Mountain (Keoghs Pimple) 8.4 -0.2 19.1 20th 2.0 +0.1 -1.7 16th 81.0 96.9 low 84%
Low Rocky Point 13.4   24.4 20th 8.0   3.5 17th
Scotts Peak Dam 12.4 0.0 22.3 21st 4.4 0.0 0.0 10th 168.4 212.7 low 79%
Strahan Aerodrome 14.5 +0.1 25.8 20th 6.9 +0.6 1.5 17th 114.4 150.4 low 76%
Warra 11.3 -0.2 22.0 20th 4.4 +1.0 0.1 8th 152.4 193.1 average 79%
King Island (district 98)
King Island Airport 14.3 -0.4 21.1 20th 8.4 0.0 -0.7 18th 62.2 85.0 low 73%
Flinders Island (district 99)
Flinders Island Airport 15.0 -0.1 20.1 20th 7.3 -0.3 -1.3 17th 59.6 62.4 average 96%
Hogan Island 14.6 +0.1 20.3 21st 9.1 -0.1 6.3 17th 55.2 54.3 average 102%
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 Tuesday 1 October 2019. 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