Northern Territory in September 2017: Hot days continue

Well above average daytime temperatures were again a feature in the Northern Territory during September. Overnight temperatures, in contrast, were generally cooler than average in nearly all parts of the NT. Rainfall was below average.

Very warm days

  • No part of the NT experienced below average daytime temperatures during September; Territory-wide, the mean daily maximum temperature was 2.05 °C above the long-term average
  • The Top End was especially warm, having its warmest September on record at 2.02 °C above average; several sites had their highest September mean daily maximum temperature on record
  • Very warm temperatures affected the central NT in the last week of the month with some sites recording their highest September temperature on record
  • Overnight temperatures were average or below average in most districts; the September mean daily maximum temperature was 0.23 °C below average

Southern NT sees first useful rain for months

  • Apart from the southern third and far northeast of the Northern Territory, all parts had average to below average rainfall during the month
  • Rainfall in the southern NT in the last days of the month was the first significant rainfall in that region for more than 6 months; Curtin Springs had its highest September daily rainfall on record
  • Many rainfall recording sites in the NT observed no rain during the month; overall, Territory rainfall was 25% below average

Darwin Airport

  • Total rainfall for Darwin Airport was 0 mm, which is 0% of the long-term average of 15.8 mm; the most recent year Darwin had no rain during September was 2014
  • The mean daily maximum temperature for Darwin Airport was 34.1 °C, which is 1.5 °C above the long-term average of 32.6 °C and the highest on record. The warmest day was 36.9 °C on the 16th, and the coolest day was on the 3rd when the temperature reached 32.1 °C.
  • The mean daily minimum temperature for Darwin Airport was 22.5 °C, which is 0.5 °C below the long-term average of 23.0 °C. The coldest morning was 17.0 °C on the 8th, and the warmest morning was on the 30th when the minimum temperature was 26.1°C

Alice Springs Airport

  • Total rainfall for Alice Springs Airport was 5.2 mm, which all fell on the 30th; this was 60% of the long-term average of 8.6 mm. Prior to the rainfall of 30 September, the most recent date Alice Springs recorded a daily rainfall total of more than 1 mm was 7 February, 2017
  • The mean daily maximum temperature for Alice Springs Airport was 29.7 °C, which is 2.4°C above the long-term average of 27.3 °C. The warmest day was 38.3 °C on the 27th, and the coolest day was on the 30th when the temperature reached 16.1 °C
  • The mean daily minimum temperature for Alice Springs Airport was 9.8 °C, which is 0.5 °C below the long-term average of 10.3 °C. The coldest morning was 0.7 °C on the 15th, and the warmest morning was on the 23rd when the minimum temperature was 25.4 °C

Further information

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Extremes in September 2017
Hottest day 40.9 °C at Daly Waters Airstrip on the 27th
40.9 °C at Lajamanu Airport on the 29th
Warmest days on average 38.1 °C at Bradshaw
Coolest days on average 29.1 °C at Arltunga
29.1 °C at McCluer Island
Coldest day 16.1 °C at Alice Springs Airport on the 30th
Coldest night 0.0 °C at Arltunga on the 2nd
0.0 °C at Arltunga on the 15th
Coolest nights on average 7.1 °C at Arltunga
Warmest nights on average 25.4 °C at McCluer Island
Warmest night 27.3 °C at Charles Point on the 29th
Warmest on average overall 29.6 °C at Jabiru Airport
Coolest on average overall 18.3 °C at Arltunga
Wettest overall 45.5 mm at Curtin Springs
Wettest day 30.5 mm at Curtin Springs on the 30th
Strongest wind gust 70 km/h at Alice Springs Airport on the 25th

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
Curtin Springs 30.5 on the 30th 23.0 on the 12th in 2010 63



Record highest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Daly Waters Airstrip 40.9 on the 27th = 40.9 on the 27th in 2012 49 34.8
Tennant Creek Airport 39.4 on the 27th 39.0 on the 24th in 2013 49 31.7
Point Fawcett 35.5 on the 16th = 35.5 on the 22nd in 2015 20 32.0



Record highest September mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Darwin Airport 34.1 34.0 in 2010 76 32.6
Daly Waters Airstrip 37.2 37.1 in 2013 48 34.8
Jabiru Airport 37.4 = 37.4 in 2009 39 36.2
Gove Airport 31.5 = 31.5 in 2016 38 30.4
McArthur River Mine Airport 37.0 = 37.0 in 2013 38 35.4
Borroloola Airport 36.2 35.9 in 2009 23 35.0



Record highest September daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Channel Point 27.0 on the 30th = 27.0 on the 22nd in 2009 23 21.5



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
Darwin-Daly (district 14GA)
Batchelor Airport 36.8 +0.8 37.9 25th 20.3 -0.3 14.6 8th 0 8.5 lowest 0%
Black Point 32.2 +0.6 33.9 18th 23.5 +0.5 21.7 9th 0 1.7 lowest 0%
Bradshaw 38.1 +0.6 40.3 25th 20.5 -1.5 13.3 1st 0 2.0 v low 0%
Central Arnhem Plateau 34.5 +0.7 36.6 28th 18.9 -0.3 13.8 10th 0 5.8 v low 0%
Croker Island Airport 32.6   33.9 26th 22.8   20.6 17th 0
Darwin Airport 34.1 +1.5 36.9 16th 22.5 -0.5 17.0 8th 0 15.6 lowest 0%
Delamere Weapons Range 36.2 +0.5 39.0 27th 19.9 -0.8 14.6 1st 0 3.8 lowest 0%
Douglas River Research Farm 37.6 +0.9 39.5 22nd 17.6 -1.1 10.9 1st 0 5.3 lowest 0%
Dum In Mirrie Airstrip 33.0 +1.3 36.6 16th 22.6 -0.5 15.6 8th 0 12.6 lowest 0%
Jabiru Airport 37.4 +1.2 39.0 23rd 21.8 +0.2 17.3 1st 2.0 12.3 average 16%
Katherine Country Club 36.7   39.5 28th 18.5   12.1 9th 0
McCluer Island 29.1 -0.1 30.6 30th 25.4 +0.7 23.7 8th 0 1.5 lowest 0%
Middle Point 37.3 +0.9 38.5 20th 18.9 -0.1 11.2 8th 0 16.8 v low 0%
Murganella Airstrip 33.7   35.3 30th 18.9   13.4 9th 0
Noonamah Airstrip 36.8   38.3 20th 20.3   12.0 8th 0
Oenpelli Airport 37.3   38.4 14th 20.1   16.4 16th 0
Pirlangimpi Airport 34.8 +1.5 36.7 16th 21.7 +0.4 18.5 9th 1.4 28.0 low 5%
Point Fawcett 33.6 +1.6 35.5 16th 20.3 -0.9 16.9 1st 0 9.7 lowest 0%
Point Stuart 34.3   36.1 15th 21.6   17.0 16th 0.6 10.8 average 6%
Port Keats Airport 34.0 +0.4 37.6 16th 20.4 -0.5 13.9 1st 0.4 3.1 average 13%
Tindal RAAF 36.7 +0.9 39.7 28th 18.7 -1.3 12.6 8th 0 8.8 lowest 0%
Arnhem (district 14BC)
Cape Wessel 33.0   34.0 30th 24.7   23.4 27th 0.6 6.6 average 9%
Gove Airport 31.5 +1.1 33.3 28th 21.3 +1.6 18.3 3rd 0.2 6.8 average 3%
Groote Eylandt Airport 33.0 +0.5 36.1 26th 19.0 +1.1 16.5 2nd 0 8.2 v low 0%
Maningrida Airport 32.9 +0.7 35.0 7th 20.3 -0.2 16.1 9th 0 7.5 v low 0%
Milingimbi Airport 32.6 +0.8 35.3 7th 21.7 +0.3 18.6 9th 0 4.4 v low 0%
Ngayawili 32.9 +1.1 34.3 17th 21.5 +0.9 18.6 11th 2.6 6.9 high 38%
Warruwi Airport 31.3 +0.4 32.8 25th 24.1 +0.5 20.7 2nd 0 1.4 lowest 0%
Roper-Mcarthur (district 14DE)
Borroloola Airport 36.2 +1.2 38.3 28th 17.6 0.0 12.2 7th 0 3.6 lowest 0%
Bulman 36.5 +0.2 38.9 28th 17.8 0.0 12.1 9th 0 17.9 v low 0%
Centre Island 31.0 +0.4 34.1 30th 22.2 0.0 20.2 1st 1.4 1.9 high 74%
Daly Waters Airstrip 37.2 +2.4 40.9 27th 14.5 -2.4 7.5 17th 0 2.0 lowest 0%
McArthur River Mine Airport 37.0 +1.6 40.2 28th 17.9 +0.6 12.8 6th 0 5.0 lowest 0%
Ngukurr Airport 36.9   40.4 28th 17.9   11.5 7th 0
Victoria (district 14F)
Lajamanu Airport 36.0 +1.4 40.9 29th 14.8 -1.8 7.6 1st 0 4.6 lowest 0%
Victoria River Downs 36.6 +1.0 40.4 26th 15.9 -2.3 8.2 1st 0 4.4 lowest 0%
Wave Hill 35.9 +0.8 39.2 30th 17.4 -0.5 9.0 1st 0 13.2 lowest 0%
Barkly (district 15A)
Elliott 35.4 +0.1 39.9 27th 16.6 -0.8 8.8 1st 0 5.7 lowest 0%
Tennant Creek Airport 33.6 +1.9 39.4 27th 18.7 +0.3 13.8 15th 0 7.7 lowest 0%
Alice Springs (district 15B)
Alice Springs Airport 29.7 +2.4 38.3 27th 9.8 -0.5 0.7 15th 5.2 8.6 average 60%
Arltunga 29.1 +1.5 39.0 27th 7.1 -3.5 0.0 2nd 3.0 7.7 average 39%
Curtin Springs 29.5 +1.7 36.6 22nd 10.2 +0.2 1.0 4th 45.5 10.1 v high 450%
Jervois 30.9 +1.2 40.8 27th 11.4 0.0 3.0 1st 0 10.8 lowest 0%
Rabbit Flat 34.9 +0.5 40.8 29th 11.7 -2.7 4.2 16th 0 5.3 lowest 0%
Territory Grape Farm 31.4 +1.2 37.9 26th 9.5 -2.5 3.8 2nd 3.0 10.3 average 29%
Walungurru Airport 32.6 +0.9 37.4 22nd 16.1 -0.6 10.2 4th 5.8 7.5 high 77%
Yulara Airport 29.5 +0.8 37.1 21st 10.5 -0.2 1.9 4th 42.8 9.0 v high 476%

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Northern Territory 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 10 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