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Monday, 1 February 2010 - Monthly Climate Summary for Northern Territory - Product code IDCKGC12R0
Heavy rains saturated the Alice Springs district and Top End with some sites recording their wettest January on record. Active monsoonal bursts and a low pressure system, along with ex-Tropical Cyclone Olga at the end of the month, contributed to the above average rainfall. Meanwhile, the heavy rain and cloud cover contributed to much cooler days across the Territory.
Active troughs over the Top End during the month contributed to the high rainfall in that region, with a few sites in the Darwin and rural areas and coastal Arnhem land receiving over 200 mm more than their average for January. Darwin Airport had 623 mm which has only been exceeded eight times since records began there in 1941, while Oenpelli's total of 533 mm has been higher just six times since 1911. A low pressure system over the Top End moved south into the western Alice Springs district on the 6th, bringing heavy rains over the next three days to most sites. Alice Springs had 122 mm during this time, which is more than the average rainfall it receives in the first four months of the year. On the 7th, the Todd river flowed for the first time in over a year with some flooding in the town and surrounding areas. Some sites had their highest total January rainfall on record. There were some small pockets near Victoria River Downs and the north-eastern Alice Springs district that received below average rainfall. Heavy rain near Katherine at the end of the month associated with ex-TC Olga produced falls of over 100 mm in that area, however no major flooding occurred with Katherine River peaking at just 12 metres.
The wettest overall was 819.0 mm at Channel Island, followed by 791.0 mm at The Chase and 772.1 mm at Wagait Beach.
The wettest single day was on the 29th associated with ex Tropical Cyclone Olga with 251.0 mm at Favenc Range, 213.0 mm at Mallapunyah and 201.5 mm at Baileys Grave GS.Some sites also had their highest January daily rainfall on record, mostly in the Alice Springs District on the 7th.
Daytime temperatures were 1 °C cooler than average across the Territory, with the south and east up to 2 °C cooler. The presence of heavy cloud during active monsoonal bursts throughout the month, the presence of the low that moved south from the Top End into the Alice Springs district in the second week and ex-TC Olga in the last week of the month contributed to these lower than average temperatures. Small patches of the Territory in the northwest were slightly above average, including Kidman Springs and Delamere Weapons Range. These were up to 1 °C warmer. The warmest days were around the middle of the month over the Top End with a low in the Gulf directing warm south-easterlies over this region. Warm days also occurred during the last week of the month in southern parts.
The hottest day was 43.9 °C at Curtin Springs on the 27th, followed by 43.2 °C at Rabbit Flat on the 26th, then 43.1 °C at Yulara Aero AWS on the 26th and again on the 27th.
The warmest days on average were 37.4 °C at Rabbit Flat, followed by 37.1 °C at Curtin Springs and 37.0 °C at Wave Hill.
The coolest days on average were 30.7 °C at Central Arnhem Plateau AWS, followed by 30.8 °C at McCluer Island AWS, then 31.1 °C at Black Point.
The coldest day was 23.4 °C at Alice Springs Airport and 23.6 °C at Arltunga on the 7th, followed by 24.5 °C at Yulara Aero AWS on the 12th (which was also its coldest January day (lowest maximum temperature) on record.)
Overnight temperatures were close to average across the Territory, with some warmer spots in the Victoria River district (Victoria River Downs was up to 1 °C above average) and cooler in the Barkley district (Tennant Creek was almost 1 °C below average).
The coldest night was 6.6 °C at Papunya on the 7th, followed by 13.9 °C at Arltunga on the 20th and 14.0 °C on the 21st.
The coolest nights on average were 21.4 °C at Alice Springs Airport, followed by 21.5 °C at Arltunga and 21.8 °C at Kulgera.
The warmest nights on average were 27.8 °C at Northern Endeavour AWS, 26.7 °C at Centre Island and 25.9 °C at Cape Don AWS
The warmest night for the month was 30.1 °C at McArthur River Mine on the 26th, followed by 30.0 °C at Northern Endeavour AWS on various nights throughout the month.January had a mixed bag of very warm and very cool nights in some places; Oenpelli had its lowest January temperature on record on the 30th while Boroloola had its warmest January night (highest daily minimum temperature) on record on the 26th.
The strongest wind gust recorded for the month was 91 km/h (49 kts) at McCluer Island on the 30th, associated with a squall line south of Timber Creek that moved north towards the coast. A squall line on the 17th that spanned the Darwin and rural areas generated gale force wind gusts at Dundee Downs, Bynoe Harbour and Annaburroo. The line weakened rapidly after it passed Middle Point, with Darwin Airport reporting sustained 20kt winds for at least 40 minutes.
|Extremes in January 2010|
43.9 °C at Curtin Springs on the 27th
|Warmest days on average||
37.4 °C at Rabbit Flat
|Coolest days on average||
30.7 °C at Central Arnhem Plateau AWS
23.4 °C at Alice Springs Airport on the 7th
6.6 °C at Papunya on the 7th
|Coolest nights on average||
21.4 °C at Alice Springs Airport
|Warmest nights on average|| 26.7 °C at Centre Island AWS
30.1 °C at McArthur River Mine on the 26th
819.0 mm at Channel Island
251.0 mm at Favenc Range on the 29th|
|Highest wind gust||
91 km/h at McCluer Island AWS on the 30th
|Record highest January daily rainfall|
Highest daily rainfall
|Vaughan Springs||140.0||on the 7th||98.2||on the 22nd in 1974||49|
|Mount Skinner||121.6||on the 7th||118.6||on the 4th in 2005||46|
|Mallapunyah||213.0||on the 29th||140.0||on the 19th in 1979||44|
|Papunya||76.2||on the 8th||70.0||on the 23rd in 1974||37|
|Wollogorang||167.8||on the 29th||=167.8||on the 11th in 2003||33|
|Palm Valley||81.4||on the 9th||42.8||on the 11th in 1984||27|
|Territory Grape Farm AWS||111.0||on the 7th||95.4||on the 18th in 1995||15|
|Wallace Rock Hole||109.6||on the 9th||69.6||on the 30th in 2001||22|
|Gemtree Park||84.0||on the 7th||83.2||on the 18th in 1995||19|
|Record highest total January rainfall|
|Palm Valley||170.6||162.7||in 1995||27||27.2|
|Territory Grape Farm AWS||280.4||158.4||in 1995||15||46.9|
|Wallace Rock Hole||168.6||143.4||in 2001||22||23.0|
|Gemtree Park||188.7||158.5||in 2007||19||57.0|
|Tilmouth Well||151.6||150.7||in 2007||14||41.8|
|Walker Creek||756.6||712.6||in 1997||14||383.4|
|Dum In Mirrie AWS||573.8||489.2||in 2004||12||328.1|
|Record lowest January daily maximum temperature|
Lowest daily maximum
|Yulara Aero AWS||24.5||on the 12th||25.0||on the 17th in 1995||22||38.5|
|Record highest January daily minimum temperature|
Highest daily minimum
|Borroloola AWS||29.2||on the 26th||28.8||on the 7th in 2007||13||24.9|
|Record lowest January temperature|
|Oenpelli||15.5||on the 30th||17.5||on the 15th in 1979||40||24.5|
|Summary statistics for January 2010|
|Maximum temperatures (°C)||Minimum temperatures (°C)||Rainfall (mm)|
|Darwin-Daly (district 14GA)|
|Batchelor Aero AWS||31.9||-1.0||35.0||16th||23.9||-0.1||21.5||28th||422.4||286.0||high||148%|
|Cape Don AWS||31.4||32.6||16th||25.9||23.5||5th||261.4||221.9||high||118%|
|Central Arnhem Plateau AWS||30.7||34.5||16th||23.0||20.3||19th||503.8|
|Delamere Weapons Range AWS||35.3||+1.0||38.9||26th||24.4||+0.6||22.2||30th||137.8||200.6||average||69%|
|Douglas River||33.1||-0.6||35.3||16th||24.1||+0.3||22.1||28th||463.4||272.3||v high||170%|
|Dum In Mirrie AWS||31.2||-0.4||32.8||1st||25.3||-0.4||22.4||28th||573.8||328.1||highest||175%|
|Jabiru Airport AWS||32.5||-1.1||36.1||16th||24.5||-0.1||22.9||19th||471.4||356.5||high||132%|
|Katherine Aviation Museum||34.0||-0.8||36.5||23rd||24.4||+0.2||22.9||29th||342.8||262.6||high||131%|
|McCluer Island AWS||30.8||32.6||20th||25.8||22.9||14th||347.4||221.5||high||157%|
|Middle Point AWS||33.2||35.6||16th||24.3||22.2||19th||304.2|
|Pine Creek Council||32.5||34.9||16th||24.1||21.6||28th||507.2|
|Point Fawcett AWS||31.1||-0.6||33.1||19th||25.8||0.0||22.5||28th||424.0||339.0||high||125%|
|Tindal RAAF AWS||33.5||-0.5||35.8||20th||24.7||+0.5||22.7||29th||315.4||266.8||high||118%|
|Arnhem (district 14BC)|
|Groote Eylandt Airport AWS||32.8||36.5||20th||24.9||23.6||13th||180.4|
|Maningrida Aero AWS||32.0||34.2||14th||24.8||22.5||19th||607.0|
|Roper-Mcarthur (district 14DE)|
|Centre Island AWS||33.4||-0.2||38.4||24th||26.7||0.0||24.2||3rd||228.6||218.2||average||105%|
|Daly Waters AWS||34.8||-1.0||38.7||26th||23.9||-0.1||18.1||20th||176.4||150.5||average||117%|
|McArthur River Mine||35.1||-0.9||40.5||22nd||25.5||+0.7||21.5||20th||328.8||198.1||high||166%|
|Victoria (district 14F)|
|Victoria River Downs||36.6||-0.1||39.6||1st||25.8||+0.9||24.0||11th||107.4||150.5||average||71%|
|Barkly (district 15A)|
|Tennant Creek Airport||35.8||-1.0||41.0||26th||24.2||-0.8||20.2||21st||173.6||107.5||high||161%|
|Alice Springs (district 15B)|
|Alice Springs Airport||35.2||-1.2||41.3||1st||21.4||0.0||16.0||20th||140.8||37.5||v high||375%|
|Territory Grape Farm AWS||36.4||-1.2||41.4||1st||22.4||+0.8||16.8||20th||280.4||46.9||highest||598%|
|Yulara Aero AWS||36.8||-1.7||43.1||27th||22.4||-0.2||18.1||18th||55.0||26.2||high||210%|
A Monthly Climate Summary is prepared to list 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, usually published in the fourth week of the month.
This statement has been prepared based on information available at 11 am on Monday 1 February 2010. 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.