Thursday, 1 October 2009 - Monthly Climate Summary for Northern Territory - Product code IDCKGC22R0
September was warmer than usual overall, with both maximum and minimum temperatures above the long-term average. Rainfall values were close to normal across the Territory, but wetter than usual in the northwest due to a wet start to the month. Severe thunderstorms and dust storms were observed in the Alice Springs District.
Darwin had a wet start to September, with afternoon showers about from the 5th to the 12th. Overall, Darwin Airport recorded a total rainfall of 34.4 mm for the month, which is 20.6 mm above its long-term September mean. Darwin also experienced a warm September this year, with the mean maximum temperature of 33.4°C being 0.9°C greater than the long-term September mean, and the mean minimum temperature of 24.0°C being 1.0°C above the long-term September mean.
Alice Springs Airport recorded a total rainfall of 6.0 mm for September, which is 2.1 mm below its long-term mean. These rain events were due to shower and thunderstorm activity ahead of troughs over WA. It was quite windy ahead of one of these troughs on the 15th and 16th, with a maximum wind gust of 81km/h recorded on the 16th. Alice Springs was much warmer than normal this September, with a mean maximum temperature of 29.7°C being 2.5°C greater than climatology, and a mean minimum temperature of 14.2°C being 3.9°C above climatology!
The northwest Darwin-Daly District experienced a wet start to the month, with afternoon showers about from the 5th to the 12th, and a few isolated storms. The highest rainfall amount recorded within this period was 62 mm at Elizabeth Valley on the 8th.
Thundery showers were about in the southwest Alice Springs District on the 14th, 15th and 16th ahead of a trough over Western Australia. No rainfall was recorded in any rain gauges on the 14th or 15th, but Watarrka recorded 0.8 mm of rain on the 16th. More showers and thunderstorms were about on the 17th, 18th and 19th ahead of another trough over WA, with widespread falls recorded at several stations.
Some areas of the northern Darwin-Daly, western Arnhem and southern Alice Springs districts had slightly more rainfall than usual for the month of September. The rest of the Territory was just under the long-term September average.
The average rainfall over the whole of the Territory was 3.7 mm which is 3.2 mm less than the long-term average of 6.9 mm.
The wettest overall was 86.6 mm at Noonamah AWS, followed by 84.8 mm at Elizabeth Valley, and then by 66.4 mm at Darwin River Ridge.
Some sites had their highest total September rainfall on record.
The wettest single days were all on the 8th with 62.2 mm at Elizabeth Valley, followed by 61.2 mm at Noonamah AWS, and then by 39.8 mm at Humpty Doo Fire Station.
Some sites had their highest September daily rainfall on record.
All stations across the Territory recorded mean maximum temperatures warmer than their long-term mean for September, with several stations recording their warmest September on record. Stations across the Territory recorded maximum temperatures of between 1 to 3°C greater than climatology, with areas in the southwest recording maximum temperatures of around 3 to 4°C above climatology.
The area-averaged maximum temperature was 33.6°C, which was 2.2°C warmer than the long-term average of 31.4°C.
The hottest days were all on the 23rd, with 41.5°C at Bradshaw AWS, followed by 41.1°C at Port Keats Aero, and then by 40.6°C at Mango Farm.
The warmest days on average were 38.3°C at Bradshaw AWS, followed by 38.2°C at Douglas River, and then by 38.1°C at Timber Creek.
The coolest days on average were 27.5°C at Kulgera, followed by 29.6°C at Arltunga, and then by 29.7°C at Alice Springs Airport.
The coldest day was 18.8°C at Kulgera on the 26th, followed by 20.2°C at Alice Springs Airport on the 26th, and then by 20.4°C at Kulgera on the 27th.
Some sites had their highest September temperature on record.
Some sites had their highest September mean daily maximum temperature on record.
Average minimum temperatures have been much warmer than usual across the Territory this month, apart from a small area in the eastern Roper-McArthur District. Almost all stations recorded mean minimum temperatures of 1 to 3°C above climatology, with some sites in the south recording mean minimums of up to 5°C warmer than the long-term average. Some sites had their warmest September minimums on record.
The area-averaged minimum temperature was 18.0°C, which was 2.1°C above the long-term average of 15.9°C.
The coldest night was 3.0°C at Curtin Springs on the 11th, followed by 3.1°C at Yulara Aero AWS on the 8th, and then by 3.2°C at Arltunga on the 9th and on the 28th.
The coolest nights on average were 11.8°C at Yulara Aero AWS, followed by 12.3°C at Curtin Springs, and then by 12.3°C at Kulgera.
The warmest nights on average were 25.0°C at Warruwi AWS.
The warmest night was 28.5°C at Kidman Springs on the 22nd, followed by 28.0°C at Kidman Springs on the 6th and 26th, and then by 27.9°C at Dum In Mirrie AWS on the 23rd.
Some sites had their warmest September night (highest daily minimum temperature) on record.
Some sites had their highest September mean daily minimum temperature on record.
The strongest wind gust was 117 km/h at Yulara Aero AWS on the 16th, followed by 81 km/h at Alice Springs Airport on the 16th, and then by 80 km/h at Yulara Aero AWS on the 2nd.
Severe thunderstorms were observed on radar in the Alice Springs District from the 16th to the 19th ahead of a trough over WA. On the 16th, these storms were observed near Yulara and Curtin Springs, with a 117km/h wind gust recorded at Yulara AWS and a dust storm reported. Wind gusts were estimated to 111km/h at Curtin Springs, with large trees uprooted, and a very thick dust storm reported. Several other severe thunderstorms were observed on radar, in the northeast Alice Springs District on the 17th, and in the southern Alice Springs District on the 18th and 19th. A 117km/h was recorded at Oodnadatta (in South Australia) on the 19th.
On the 21st a dust storm was reported at Kulgera ahead of a strong cold front moving in from the west. This cold front brought fresh to strong and gusty westerlies over the Alice Springs District on the 22nd with more areas of raised dust. This front continued east through NSW and Queensland, with dust reducing visibility across NSW and southern QLD on the 23rd. This dust eventually reached the north Island of New Zealand on the 24th, after the front carried this dust across the Tasman Sea.
41.5°C at Bradshaw AWS on the 23rd *
|Warmest days on average
Highest mean daily maximum temperature
38.3°C at Bradshaw AWS *
|Coolest days on average|
Lowest mean daily maximum temperature
27.5°C at Kulgera
Lowest daily maximum temperature
18.8°C at Kulgera on the 26th
3.0°C at Curtin Springs on the 11th
|Coolest nights on average
Lowest mean daily minimum temperature
11.8°C at Yulara Aero AWS
|Warmest nights on average|
Highest mean daily minimum temperature
25.0°C at Warruwi AWS
Highest daily minimum temperature
28.5°C at Kidman Springs on the 22nd
Highest total rainfall
86.6 mm at Noonamah AWS
Highest daily rainfall
62.2 mm at Elizabeth Valley on the 8th
|Highest wind gust
117 km/h at Yulara Aero AWS on the 16th|
|Record highest September daily rainfall|
Highest daily rainfall
|Palm Valley||19.0||on the 17th||18.2||on the 1st in 1997||26|
|Elizabeth Valley||62.2||on the 8th||53.0||on the 29th in 1986||23|
|Karama||35.0||on the 8th||17.7||on the 29th in 2007||21|
|Record highest total September rainfall|
|Elizabeth Valley||84.8||53.0||in 1986||23|
|Batchelor Aero AWS||26.6||14.0||in 1999||12|
|Record highest September temperature|
|Mango Farm||40.6||on the 23rd||40.5||on the 27th in 1997||28|
|Black Point||34.7||on the 25th||34.4||on the 25th in 2008||17|
|Lajamanu AWS||40.3||on the 21st||40.0||on the 30th in 2005||14|
|Groote Eylandt Airport AWS||36.4||on the 25th||36.0||on the 23rd in 2007||10|
|Record highest September mean daily maximum temperature|
Mean daily maximum
|Previous highest||Years of
|Jabiru Airport AWS||37.5||37.4||in 2008||31|
|Mango Farm||37.8||37.5||in 1997||28|
|Timber Creek||38.1||37.7||in 2005||28|
|Pirlangimpi AWS||34.6||33.9||in 2008||24|
|Douglas River||38.2||37.6||in 1997||18|
|Borroloola AWS||35.9||35.8||in 1997||13|
|Channel Point||31.8||31.3||in 2004||11|
|Delamere Weapons Range AWS||36.7||36.4||in 2005||12|
|Point Fawcett||32.7||32.6||in 1998||11|
|Dum In Mirrie AWS||32.1||32.0||in 2004||10|
|Groote Eylandt Airport AWS||33.3||33.2||in 2001||10|
|Record highest September daily minimum temperature|
Highest daily minimum
|Previous highest||Years of
|Darwin Airport||27.2||on the 22nd||26.7||on the 27th in 1998||68|
|Alice Springs Airport||27.4||on the 21st||26.0||on the 24th in 1971||67|
|Curtin Springs||22.4||on the 21st||= 22.4||on the 28th in 2006||44|
|Mango Farm||25.6||on the 24th||24.5||on the 16th in 1998||28|
|Territory Grape Farm AWS||26.2||on the 21st||24.0||on the 23rd in 2003||16|
|Lajamanu AWS||27.5||on the 21st||27.2||on the 24th in 1971||14|
|Channel Point||27.0||on the 22nd||26.7||on the 30th in 1996||12|
|Batchelor Aero AWS||24.9||on the 24th||24.2||on the 29th in 1997||12|
|Kidman Springs||28.5||on the 22nd||28.2||on the 20th in 2008||13|
|Point Fawcett||27.7||on the 23rd||26.9||on the 23rd in 2003||11|
|Dum In Mirrie AWS||27.9||on the 23rd||27.0||on the 25th in 2003||10|
|Record highest September mean daily minimum temperature|
Mean daily minimum
|Previous highest||Years of
|Alice Springs Airport||14.2||13.7||in 1996||67|
|Jervois||14.4||= 14.4||in 1997||41|
|Channel Point||23.5||22.9||in 2005||14|
|Batchelor Aero AWS||22.5||21.9||in 1992||13|
|Dum In Mirrie AWS||24.7||24.2||in 2005||10|
|McCluer Island AWS||25.4||25.2||in 2000||10|
This table is very wide and may not fit if printed.
|Summary statistics for September 2009|
|Darwin-Daly (district 14GA)|
|Batchelor Aero AWS||36.6||+0.6||38.0||23rd||22.5||+2.1||16.6||29th||26.6||highest||719%|
|Black Point||32.4||+0.9||34.7||25th||24.1||+1.2||21.4||29th||2.1||very high||233%|
|Cape Don AWS||31.6||33.4||28th||24.9||23.5||3rd||0||lowest||0%|
|Central Arnhem Plateau AWS||34.5||36.2||7th||20.4||13.4||29th||23.8|
|Delamere Weapons Range AWS||36.7||+1.2||39.8||23rd||21.5||+0.8||15.6||30th||0.4||average||10%|
|Dum In Mirrie AWS||32.1||+0.7||33.5||16th||24.7||+1.8||21.4||29th||31.6||very high||343%|
|Jabiru Airport AWS||37.5||+1.4||38.7||26th||23.0||+1.5||20.1||29th||24.2||high||384%|
|Katherine Aviation Museum||36.7||+0.9||39.0||23rd||21.5||+1.5||14.0||29th||0.2||average||3%|
|McCluer Island AWS||29.7||+0.6||31.3||23rd||25.4||+0.8||23.8||1st||1.6||very high||800%|
|Middle Point AWS||37.2||38.4||15th||21.0||18.0||19th||35.8|
|Pine Creek Council||36.4||38.4||23rd||22.9||18.4||29th||6.8|
|Point Fawcett AWS||32.7||+0.8||34.4||27th||22.0||+0.6||18.2||19th||0.4||average||7%|
|Tindal RAAF AWS||37.0||+1.4||39.5||23rd||22.2||+2.2||17.3||29th||1.2||average||16%|
|Arnhem (district 14BC)|
|Groote Eylandt Airport AWS||33.3||+0.7||36.4||25th||18.4||+0.9||14.4||12th||0.2||low||11%|
|Maningrida Aero AWS||32.5||36.2||27th||21.6||17.4||29th||0|
|Roper-Mcarthur (district 14DE)|
|Daly Waters AWS||36.5||+2.0||39.3||22nd||17.8||+0.7||7.9||29th||0||lowest||0%|
|McArthur River Mine||36.8||+1.6||39.3||26th||19.3||+2.3||13.7||30th||0.2||average||4%|
|Victoria (district 14F)|
|Victoria River Downs||37.7||+2.2||39.8||22nd||19.0||+0.8||11.7||29th||0||lowest||0%|
|Barkly (district 15A)|
|Tennant Creek Airport||33.5||+1.9||38.6||22nd||19.5||+1.1||13.6||27th||5.8||average||72%|
|Alice Springs (district 15B)|
|Alice Springs Airport||29.7||+2.5||37.4||21st||14.2||+3.9||4.0||28th||6.0||average||74%|
|Territory Grape Farm AWS||31.3||+0.8||37.1||20th||13.1||+0.9||4.7||28th||2.2||average||27%|
|Yulara Aero AWS||29.9||+1.1||35.9||19th||11.8||+1.1||3.1||8th||6.8||high||121%|
This statement has been prepared based on information available at 10 am on Thursday 1 October 2009. 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
the years 1800 to 2008.
They are not shown for sites with less than 10 years of record in that time, 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
(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.