Northern Territory in September 2016: Very wet start to the build up

Rainfall across the Northern Territory was the highest ever observed in September. Warm conditions were again a feature, although below average daytime temperatures were observed in the southern half of the NT. Overnight temperatures were well above average throughout.

Wettest September on record

  • The Northern Territory observed more rainfall than any previous September on record. Territory-wide, nearly seven times the average rainfall was recorded
  • Rainfall in the southern half of the NT was due to rain-bearing cloudbands which moved across the region several times during the month
  • The bulk of the rain in the north fell on the 19th and 20th as tropical moisture from the north combined with a deep low-pressure trough
  • Many sites in the north had their highest September daily rainfall on record during this two-day period. Many sites also had their highest total September rainfall on record or highest in several decades

Warm conditions continue

  • Territory-wide, daytime temperatures were 0.10 °C above average, although maximum temperatures were significantly above average in the northern half of the NT
  • Overnight temperatures were well above average in all districts, apart from the far south. Overall, the mean minimum temperature was 2.19 °C above average, the ninth-warmest on record
  • Several sites had their highest September mean daily minimum temperature on record or highest for several decades, including Darwin, with 24.7 °C, second only to 1992 when the mean daily minimum was 24.9 °C
  • A few sites had their coldest September day (lowest maximum temperature) on record on the 19th, as a result of the exceptional rain which affected the Top End.
  • Further information

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    Extremes in September 2016
    Hottest day 40.7 °C at Victoria River Downs on the 28th
    40.7 °C at Bradshaw on the 30th
    Warmest days on average 37.8 °C at Bradshaw
    Coolest days on average 24.8 °C at Curtin Springs
    Coldest day 11.8 °C at Arltunga on the 14th
    Coldest night 1.0 °C at Watarrka on the 30th
    Coolest nights on average 10.0 °C at Curtin Springs
    Warmest nights on average 26.0 °C at McCluer Island
    Warmest night 28.1 °C at Dum In Mirrie Airstrip on the 26th
    Warmest on average overall 31.3 °C at Bradshaw
    Coolest on average overall 17.4 °C at Curtin Springs
    Wettest overall 253.8 mm at Leaders Creek
    Wettest day 168.2 mm at Mainoru Outstation Store on the 19th
    Strongest wind gust 76 km/h at Yulara Airport on the 28th

    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
    Warruwi Airport 26.6 on the 20th 15.8 on the 15th in 1993 93
    Black Point 27.0 on the 20th 8.9 on the 16th in 1992 51
    Jervois 43.0 on the 20th 42.6 on the 18th in 2010 51
    Camfield 64.2 on the 19th 33.0 on the 29th in 1979 48
    Kidman Springs 24.0 on the 19th 21.8 on the 24th in 1998 48
    Riveren 40.0 on the 20th 26.0 on the 25th in 1995 48
    Wave Hill 79.2 on the 20th 48.0 on the 25th in 1995 43
    Jabiru Airport 107.8 on the 19th 62.0 on the 14th in 1984 40
    Nhulunbuy 35.0 on the 19th 22.6 on the 20th in 1998 40
    Labelle Downs 44.0 on the 19th 38.0 on the 30th in 2012 29
    Mount Sanford 23.0 on the 19th 19.0 on the 30th in 1992 28
    Gemtree Park 55.0 on the 20th 36.0 on the 10th in 2010 25
    Ban Ban Springs 67.0 on the 4th 15.0 on the 22nd in 2013 23
    Territory Wildlife Park 38.6 on the 19th 32.6 on the 15th in 2002 23
    Walker Creek 56.5 on the 22nd 56.0 on the 30th in 2012 23
    Batchelor Airport 36.0 on the 28th 29.0 on the 19th in 2013 22
    Bing Bong Port 13.0 on the 29th 2.6 on the 25th in 1998 20
    Bonalbo 23.0 on the 19th 15.0 on the 14th in 2005 20



    Record highest September total rainfall
    New record
    (mm)
    Old
    record
    Years of
    record
    Average for
    September
    Katherine Council 111.2 90.9 in 1895 136 6.6
    Avon Downs 99.6 73.7 in 1947 106 6.4
    Warruwi Airport 41.6 15.8 in 1993 94 1.4
    Mount Skinner 120.4 83.4 in 2010 53 11.6
    Black Point 41.4 16.0 in 1992 51 1.7
    Camfield 79.4 41.6 in 1979 48 7.5
    Centre Island 27.6 23.0 in 1978 48 1.9
    Douglas River 64.8 37.6 in 1986 47 5.4
    Pirlangimpi Airport 139.0 124.6 in 1984 45 28.6
    Wave Hill 234.2 65.2 in 1995 43 13.5
    Jabiru Airport 242.2 81.2 in 1984 40 12.6
    Nhulunbuy 64.0 53.5 in 2010 40 5.2
    Alcan Minesite 64.4 49.7 in 1973 39 7.0
    Tindal RAAF 68.2 65.4 in 1986 34 9.1
    Yirrkala Tropical Gardens 59.0 46.0 in 2010 33 5.3
    Nathan River 28.2 24.0 in 1998 32 1.9
    Elizabeth Valley 140.8 84.8 in 2009 29 22.0
    Mount Sanford 32.1 19.0 in 1992 28 3.3
    Gemtree Park 116.6 99.0 in 2010 26 13.7
    Ban Ban Springs 76.0 21.0 in 2010 23 7.5
    Batchelor Airport 39.4 29.8 in 2013 22 8.8
    Borroloola Airport 37.8 22.6 in 2012 22 3.7
    Walker Creek 78.5 60.6 in 2002 22 17.1
    CSIRO Berrimah 87.6 46.2 in 2002 21 13.7
    Bing Bong Port 40.0 2.6 in 1998 20 2.2
    Bonalbo 38.0 15.0 in 2005 20 4.1
    Delamere Weapons Range 25.0 20.0 in 1998 20 4.0
    Thorak Cemetery 52.6 35.4 in 2002 20 10.5

    Highest September total rainfall for at least 20 years
    Observed
    (mm)
    Most recent
    higher
    Average for
    September
    Austral Downs 66.8 90.2 in 1947* 6.0
    Mount Denison 48.8 76.6 in 1975* 8.7
    Victoria River Downs 39.2 68.2 in 1979 4.4
    Coniston 80.5 114.8 in 1975* 8.8
    McArthur River Mine Airport 37.2 89.6 in 1978* 5.2
    McMinns Lagoon 54.6 71.7 in 1981* 17.0
    Darwin Airport 64.8 66.6 in 1984 15.8
    Kurundi 64.1 114.8 in 1984* 7.1
    Larrimah 45.2 61.0 in 1984* 4.0
    Lajamanu Airport 31.2 32.9 in 1984* 4.7
    Howard Springs Nature Park 70.5 123.4 in 1988 20.4
    Adelaide River Post Office 38.0 81.2 in 1986* 15.1
    Brunette Downs 16.8 19.4 in 1992 5.8
    Broadmere 23.0 36.0 in 1985* 3.2
    Tanumbirini 13.0 15.5 in 1994* 5.5

    * note: there are gaps in the historical record at this site, 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
    Victoria River Downs 40.7 on the 28th = 40.7 on the 27th in 2013 51 35.6



    Record lowest September daily maximum temperature
    New record
    (°C)
    Old
    record
    Years of
    record
    Average for
    September
    Jabiru Airport 28.8 on the 19th 30.9 on the 1st in 2004 39 36.2
    Tindal RAAF 27.1 on the 19th 28.0 on the 23rd in 1998 29 35.8
    Borroloola Airport 25.6 on the 19th 28.5 on the 7th in 1996 23 35.0



    Record highest September mean daily maximum temperature
    New record
    (°C)
    Old
    record
    Years of
    record
    Average for
    September
    Gove Airport 31.5 = 31.5 in 1998 37 30.3



    Record highest September mean daily minimum temperature
    New record
    (°C)
    Old
    record
    Years of
    record
    Average for
    September
    Victoria River Downs 23.1 22.9 in 1992 49 18.1
    Wave Hill 22.3 22.1 in 1992 42 17.8
    Douglas River 22.4 22.1 in 2010 29 18.5
    Lajamanu Airport 21.0 20.8 in 2005 22 16.4
    Batchelor Airport 23.2 = 23.2 in 2010 20 20.5

    Highest September mean daily minimum temperature for at least 20 years
    Observed
    (°C)
    Most recent
    higher
    Average for
    September
    Elliott 20.8 20.9 in 1986* 17.3
    Darwin Airport 24.7 24.9 in 1992 23.0
    Tindal RAAF 23.5 23.9 in 1992 19.9

    * 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
    New record
    (°C)
    Old
    record
    Years of
    record
    Average for
    September
    Victoria River Downs 30.1 29.9 in 1992 49 26.8

    Highest September mean temperature for at least 20 years
    Observed
    (°C)
    Most recent
    higher
    Average for
    September
    Tindal RAAF 29.8 30.6 in 1992 27.9



    Summary statistics for September 2016
    Maximum temperatures
    (°C)
    Minimum temperatures
    (°C)
    Rainfall
    (millimetres)
    Mean for
    September
    2016
    Diff
    from
    average
    Highest for
    September
    2016
    Mean for
    September
    2016
    Diff
    from
    average
    Lowest for
    September
    2016
    Total for
    September
    2016
    Average
    for
    September
    Rank of
    September
    2016
    Fraction of
    September
    average
    Darwin-Daly (district 14GA)
    Batchelor Airport 35.9 -0.1 38.4 11th 23.2 +2.7 20.9 7th 39.4 8.8 highest 448%
    Black Point 32.4 +0.8 33.7 26th 24.4 +1.5 22.5 2nd 41.4 1.7 highest 2435%
    Bradshaw 37.8 +0.4 40.7 30th 24.8 +3.0 19.9 8th 1.0 2.1 average 48%
    Central Arnhem Plateau 33.1 -0.7 35.2 27th 22.2 +3.2 18.0 7th 4.4 6.2 high 71%
    Charles Point 32.1   33.9 29th 25.6   23.4 6th 9.2
    Croker Island Airport 33.2   35.0 26th 24.0   21.9 2nd 0
    Darwin Airport 33.2 +0.6 35.5 22nd 24.7 +1.7 22.8 7th 64.8 15.8 v high 410%
    Delamere Weapons Range 36.3 +0.6 38.8 29th 23.8 +3.2 19.5 8th 25.0 4.0 highest 625%
    Douglas River 36.8 +0.1 39.8 11th 22.4 +3.9 16.1 8th 64.8 5.4 highest 1200%
    Dum In Mirrie Airstrip 32.4 +0.7 33.9 5th 25.2 +2.3 22.8 11th 32.4 13.3 high 244%
    Jabiru Airport 35.7 -0.5 38.1 11th 23.8 +2.3 21.2 22nd 242.2 12.6 highest 1922%
    Katherine Country Club 36.5   39.0 27th 23.4   17.5 7th 58.0
    McCluer Island 30.0 +0.8 31.7 25th 26.0 +1.4 24.6 10th 25.0 1.6 v high 1563%
    Middle Point 36.4 0.0 38.4 11th 22.1 +3.3 19.6 7th 35.2 17.9 average 197%
    Murganella Airstrip 32.7   34.6 16th 22.6   20.3 2nd 161.0
    Noonamah Airstrip 35.5   38.0 11th 23.8   21.6 7th 74.4
    Oenpelli Airport 36.4   38.5 12th 22.9   19.8 6th 95.8
    Pirlangimpi Airport 33.8 +0.5 35.0 6th 23.4 +2.1 22.6 9th 139.0 28.6 highest 486%
    Point Fawcett 32.7 +0.7 35.1 6th 23.1 +2.0 21.1 10th 16.6 10.2 high 163%
    Point Stuart 32.4   34.5 6th 24.4   22.2 6th 142.4 12.3 v high 1158%
    Port Keats Airport 33.7 +0.1 36.4 28th 23.6 +2.9 19.6 7th 15.8 3.2 v high 494%
    Tindal RAAF 36.2 +0.4 38.7 25th 23.5 +3.6 17.5 7th 68.2 9.1 highest 749%
    Arnhem (district 14BC)
    Cape Wessel 32.5   34.6 26th 25.0   22.2 2nd 22.0 6.8 high 324%
    Gove Airport 31.5 +1.2 33.1 26th 22.2 +2.6 18.8 2nd 62.4 6.9 v high 904%
    Groote Eylandt Airport 32.6 +0.1 36.0 27th 21.0 +3.3 16.3 1st 76.4 8.6 v high 888%
    Maningrida Airport 32.6 +0.4 35.4 5th 22.9 +2.6 20.3 1st 55.4 8.1 v high 684%
    Milingimbi Airport 32.6 +0.8 35.2 5th 23.8 +2.6 21.3 11th 20.4 4.7 high 434%
    Ngayawili 32.1 +0.3 34.0 23rd 22.5 +2.0 19.7 1st 26.6 7.2 high 369%
    Warruwi Airport 31.7 +0.8 33.9 25th 25.2 +1.6 23.4 20th 41.6 1.4 highest 2971%
    Roper-Mcarthur (district 14DE)
    Borroloola Airport 35.3 +0.3 39.7 25th 20.4 +2.9 16.0 6th 37.8 3.7 highest 1022%
    Bulman 36.2 -0.1 39.2 27th 22.3 +4.8 17.6 7th 230.8 19.2 v high 1202%
    Centre Island 31.7 +1.1 35.3 28th 23.9 +1.7 20.8 1st 27.6 1.9 highest 1453%
    Daly Waters Airstrip 36.8 +2.0 40.3 30th 19.9 +3.1 12.9 7th 14.2 2.0 v high 710%
    McArthur River Mine Airport 35.7 +0.3 40.1 27th 21.3 +4.1 16.4 7th 37.2 5.2 v high 715%
    Ngukurr Airport 36.3   39.8 28th 22.9   18.5 6th 49.0
    Victoria (district 14F)
    Lajamanu Airport 35.8 +1.3 39.4 26th 21.0 +4.6 13.3 3rd 31.2 4.7 v high 664%
    Victoria River Downs 37.1 +1.5 40.7 28th 23.1 +5.0 16.0 8th 39.2 4.4 v high 891%
    Wave Hill     39.2 28th 22.3 +4.5 15.8 3rd 234.2 13.5 highest 1735%
    Barkly (district 15A)
    Brunette Downs 33.4 -0.1 38.3 26th 18.5 +1.9 14.0 3rd 16.8 5.8 v high 290%
    Elliott 35.2 -0.2 39.2 28th 20.8 +3.5 16.8 12th 11.9 5.8 high 205%
    Tennant Creek Airport 32.4 +0.7 37.1 13th     13.9 3rd 4.4 7.3 average 60%
    Alice Springs (district 15B)
    Alice Springs Airport 24.9 -2.4 33.5 8th 10.2 -0.1 4.0 10th 48.6 8.7 v high 559%
    Curtin Springs 24.8 -3.1 31.5 28th 10.0 0.0 2.2 30th 11.5 9.6 high 120%
    Jervois 24.9 -4.9 33.8 8th 12.4 +1.1 7.6 30th 146.0 11.0 v high 1327%
    Rabbit Flat 33.9 -0.5 39.3 26th 17.5 +3.3 10.7 30th 6.0 5.6 high 107%
    Territory Grape Farm 27.0 -3.4 34.3 8th 12.7 +0.8 7.4 5th 25.8 10.5 high 246%
    Walungurru Airport 29.4 -2.5 35.3 23rd 15.1 -1.7 8.3 29th 3.0 7.6 high 39%
    Watarrka 25.5 -4.0 32.2 12th 11.5 -1.6 1.0 30th 10.8 10.3 high 105%
    Yulara Airport 25.1 -3.7 32.4 23rd 10.5 -0.2 2.7 30th 15.6 7.8 high 200%

    Notes

    The Monthly climate summary 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. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

    A climate summary is generally published on the first working day of each month.

    This statement has been prepared based on information available at 8 am on Monday 3 October 2016. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

    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.

    The ACORN-SAT dataset is used for temperature area averages.

    Further information

    Media
    (03) 9669 4057
    Enquiries