Tuesday, 4 August 2009 - Monthly Climate Summary for Northern Territory - Product code IDCKGC12R0

Northern Territory in July 2009
Warm and Dry (for July!)

Average day time temperatures were higher than normal across almost all of the Northern Territory. Overnight temperatures were also warmer than normal in the south, but cooler than usual in the Roper-McArthur District and far eastern Arnhem District. Rainfall values were close to zero across most of the Northern Territory, with the exception of isolated coastal showers in the north and northeast, and showers associated with the passage of cloud bands in the Alice Springs District.

Darwin

Darwin experienced a warm month, with the average maximum temperature of 31.3°C being 0.8°C greater than the mean for July. Overnight temperatures were close to average however, with 19.0°C only 0.3°C below climatology for July.

Alice Springs

Alice Springs also experienced a warm month, with an average day time temperature of 20.6°C being 1°C greater than the July average. Minimum temperatures at Alice were also higher than usual. All daily overnight temperatures were above 0°C, with the monthly average minimum of 5.2°C being 1.2°C above the July mean.

Rainfall

July remained a typical dry season month with no rainfall across most of the Territory. Exceptions to this were about the north and northeast coasts where isolated showers were recorded, most notably on 7, 14 and 15 July. Further south in the Alice Springs District, the passage of a cloud band in mid-July saw rainfalls at various locations in the southwest on 13 July. Another cloud band toward the end of the month saw lighter falls, predominately in the southwest of the the Alice Springs District, around 25 July.

Over the Territory as a whole, the area-averaged rainfall was 0.4 mm, 6.5 mm below the long-term average of 6.9 mm.

The wettest overall was 7.0 mm at Cape Wessel, followed by 5.6 mm at Gove Airport, and 5.6 mm at Kulgera.

The wettest single day was 6.0 mm at Cape Wessel on the 7th, followed by 5.4 mm at Kulgera on the 13th.

Maximum temperature

Average maximum temperatures were greater than normal across the Northern Territory, with many stations close to one degree above their July average and some close to two degrees above their July average.

The area-averaged maximum temperature was 26.2°C, which was 1.1°C warmer than the long-term average.

The hottest day was 37.0°C at Noonamah AWS on the 1st, followed by 36.6°C at Bradshaw AWS on the 1st and again on the 2nd, then followed by 36.2°C at Douglas River on the 2nd.

The warmest days on average were 33.6°C at Noonamah AWS, followed by 33.2°C at Middle Point AWS, and by 33.0°C at Jabiru Airport AWS.

The coolest days on average were 20.0°C at Kulgera, followed by 20.1°C at Arltunga, and by 20.6°C at Alice Springs Airport.

The coldest day was 14.2°C at Kulgera on the 27th, followed by 15.0°C at Kulgera on the 13th and again on the 15th, thenfollowed by 15.2°C at Arltunga on the 28th.

Some sites had their highest July temperature on record.

Some sites had their highest July mean daily maximum temperature on record.

Minimum temperature

In the north, minimum temperatures remained within a one-degree range of climatology, except for the Roper-McArthur District and far eastern Arnhem District where minimum temperature anomalies were between one and two degrees lower than average. In the Alice Springs District, overnight temperatures were close to, and at some locations greater than two degrees higher than average. The warmest nights were generally associated with the passage of cloud bands and/or warmer northerly winds ahead of approaching troughs.

The area-averaged minimum temperature was 11.6°C, which was 0.7°C above the long-term average.

The coldest night was −1.5°C at Arltunga on the 16th, followed by −1.1°C at Arltunga on the 19th, by −1.0°C at Watarrka on the 14th and at Arltunga on the 18th.

The coolest nights on average were 4.9°C at Yulara Aero AWS, followed by 5.1°C at Arltunga, and by 5.2°C at Alice Springs Airport and Curtin Springs.

The warmest nights on average were 22.6°C at Cape Don AWS.

Some sites had their warmest July night (highest daily minimum temperature) on record.

Wind

The strongest wind gust was 69 km/h at Middle Point AWS on the 9th, followed by 63 km/h at McCluer Island AWS on the 16th and at Yulara Aero AWS on the 20th.


Extremes

Hottest day
Highest temperature
37.0°C at Noonamah AWS on the 1st
Warmest days on average
Highest mean daily maximum temperature
33.6°C at Noonamah AWS
Coolest days on average
Lowest mean daily maximum temperature
20.0°C at Kulgera
Coldest day
Lowest daily maximum temperature
14.2°C at Kulgera on the 27th
Coldest night
Lowest temperature
−1.5°C at Arltunga on the 16th
Coolest nights on average
Lowest mean daily minimum temperature
4.9°C at Yulara Aero AWS
Warmest nights on average
Highest mean daily minimum temperature
22.6°C at Cape Don AWS
Wettest overall
Highest total rainfall
7.0 mm at Cape Wessel
Wettest day
Highest daily rainfall
6.0 mm at Cape Wessel on the 7th
Highest wind gust
69 km/h at Middle Point AWS on the 9th

Records

Record highest July temperature
Highest temperature (°C) Previous highest (°C)
Years of
record
Average
Victoria River Downs 35.8 on the 1st =35.8 on the 15th in 1995 41 29.2
Centre Island AWS 32.3 on the 2nd 31.2 on the 31st in 2006 32 26.2
Jabiru Airport AWS 36.1 on the 1st 36.0 on the 28th in 1998 29 31.8
McArthur River Mine 35.2 on the 2nd 35.0 on the 20th in 2008 28 29.9
Lajamanu AWS 33.9 on the 21st =33.9 on the 31st in 2008 14 26.6
Batchelor Aero AWS 35.8 on the 1st 35.2 on the 9th in 2005 11 31.8



Record highest July mean daily maximum temperature
Mean daily maximum
temperature (°C)
Previous highest (°C)
Years of
record
Average
Lajamanu AWS 28.5 = 28.5 in 2005 14 26.6

Record highest July daily minimum temperature
Highest daily minimum
temperature
(°C)
Previous highest
(°C)
Years of
record
Average
Jervois 20.6 on the 22nd 19.8 on the 13th in 1995 40 5.1
Territory Grape Farm AWS 19.0 on the 22nd 16.0 on the 24th in 2005 12 5.0
Rabbit Flat 19.7 on the 22nd 19.6 on the 7th in 2005 12 6.7


Summaries

This table is very wide and may not fit if printed.

Summary statistics for July 2009
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean Diff
from
average
Highest Mean Diff
from
average
Lowest Total Average
Rank Fraction of
average
Darwin-Daly (district 14GA)
Batchelor Aero AWS 32.3 +0.6 35.8 1st 16.3 +0.3 11.7 5th 0 0 lowest
Black Point 30.3 +0.7 32.2 28th 20.4 −0.3 17.8 10th 0 4.2 lowest 0%
Bradshaw AWS 32.2   36.6 2nd 14.9   8.7 17th 0
Cape Don AWS 29.5   31.0 3rd 22.6   20.0 17th 0 0.7 lowest 0%
Central Arnhem Plateau AWS 29.5   32.7 1st 14.3   10.2 9th 0
Channel Point 29.2 +0.3 30.9 19th 16.9 −0.1 13.5 18th 0 0.2 lowest 0%
Darwin Airport 31.3 +0.8 34.0 1st 19.0 −0.3 15.1 30th 0 1.3 lowest 0%
Delamere Weapons Range AWS 30.0 +0.5 34.9 1st 14.6 +0.1 9.2 17th 0 0.6 lowest 0%
Douglas River 32.1 +0.4 36.2 2nd 12.7 +0.2 5.8 17th 0 3.1 lowest 0%
Dum In Mirrie AWS 30.1   31.8 15th 17.5   13.3 10th 0 0 highest
Jabiru Airport AWS 33.0 +1.3 36.1 1st 18.2 −0.2 14.3 17th 0 3.2 lowest 0%
Katherine Aviation Museum 30.3 −0.2 34.8 1st 12.2 −0.8 7.1 10th 0 1.3 lowest 0%
Mango Farm 32.0 +0.5 35.6 21st 13.9 −1.1 6.4 17th 0 2.5 lowest 0%
McCluer Island AWS 27.8   29.9 28th 23.2   20.9 17th 0 1.6 lowest 0%
Middle Point AWS 33.2   36.1 1st 13.6   5.9 17th 0.2
Noonamah AWS 33.6   37.0 1st 15.4   10.5 6th 0
Pine Creek Council 31.1   35.1 21st 16.7   10.6 17th 0
Pirlangimpi AWS 31.7 +0.7 33.7 3rd 18.6 +0.5 14.6 9th 0 3.3 lowest 0%
Point Fawcett AWS 30.1   32.8 2nd 16.8   12.4 10th 0 0.2 lowest 0%
Port Keats Aero 32.0   35.2 2nd 16.9   9.9 18th 0
Tindal RAAF AWS 30.6 +0.7 35.0 2nd 13.3 −0.5 7.4 17th 0 3.9 lowest 0%
Arnhem (district 14BC)
Alyangula Police 27.9 −0.1 31.0 14th 17.9 +0.2 14.0 17th 0 2.9 lowest 0%
Gove Airport 28.6 +0.8 30.2 2nd 19.4 −0.8 16.1 9th 5.6 19.8 low 28%
Groote Eylandt Airport AWS 29.0   31.3 23rd 14.2   9.0 16th 0.8
Maningrida Aero AWS 30.7   33.7 27th 17.4   14.1 5th 0
Milingimbi AWS 30.5   32.1 27th 18.2   14.9 9th 0
Ngayawili AWS 29.9   31.2 27th 19.3   15.3 16th 0.8
Warruwi AWS 29.1 +0.6 31.3 28th 21.4 +0.3 19.4 17th 0 2.0 lowest 0%
Roper-Mcarthur (district 14DE)
Borroloola AWS 30.5 +0.2 35.4 2nd 11.1 −1.1 5.9 18th 0 0.7 lowest 0%
Bulman AWS 31.3   34.5 1st 12.5   6.8 17th 0
Centre Island AWS 27.1 +0.9 32.3 2nd 18.8 +0.3 16.7 17th 1.6 1.9 average 84%
Daly Waters AWS 29.8 +1.0 34.6 2nd 10.8 −1.5 4.4 17th 0.2 2.0 high 10%
Larrimah 30.0 +0.6 34.7 2nd 11.2 −1.2 5.2 16th 0 2.7 lowest 0%
McArthur River Mine 30.4 +0.5 35.2 2nd 12.3 +0.2 5.7 17th 0.2 2.8 high 7%
Ngukurr 30.6 +1.1 34.8 1st 16.0 +1.0 11.4 17th 0 1.2 lowest 0%
Wollogorang 29.6 +0.3 35.1 2nd 9.8 −1.8 3.0 17th 0 1.5 lowest 0%
Victoria (district 14F)
Kidman Springs 31.0 +0.6 35.1 2nd 12.0 −0.5 4.8 17th 0 2.8 lowest 0%
Lajamanu AWS 28.5 +1.9 33.9 21st 11.7 +3.0 2.2 17th 0 4.2 lowest 0%
Timber Creek 31.4 +0.9 36.0 22nd 13.6 −1.2 6.7 18th 0 2.0 lowest 0%
Victoria River Downs 30.8 +1.6 35.8 1st 10.9 −0.1 4.6 17th 0 2.9 lowest 0%
Wave Hill 29.1 +0.7 35.0 1st 10.9 +0.2 4.4 16th 0 4.7 lowest 0%
Barkly (district 15A)
Brunette Downs 26.6 −0.1 33.7 22nd 10.7 +0.2 4.3 30th 0 4.6 lowest 0%
Elliott 28.5 +0.1 35.0 1st 11.4 +0.2 5.8 18th 0 3.2 lowest 0%
Tennant Creek Airport 25.6 +1.1 33.6 1st 13.0 +0.8 8.0 17th 0 4.7 lowest 0%
Alice Springs (district 15B)
Alice Springs Airport 20.6 +1.0 28.5 20th 5.2 +1.2 0.2 17th 0 14.7 lowest 0%
Arltunga 20.1   27.8 21st 5.1   −1.5 16th 0 9.4 lowest 0%
Curtin Springs 21.5 +1.4 28.0 20th 5.2 +1.5 −0.9 16th 3.0 12.9 average 23%
Jervois 22.2 +0.3 31.5 21st 7.5 +2.5 1.0 17th 0 13.2 lowest 0%
Kulgera 20.0 +1.1 27.8 20th 5.9 +1.0 −0.6 28th 5.6 12.5 average 45%
Rabbit Flat 27.1 +1.0 33.4 25th 8.4 +1.6 0.5 16th 0 3.7 lowest 0%
Territory Grape Farm AWS 22.8 +0.2 29.0 21st 7.1 +2.1 1.7 16th 0 4.9 lowest 0%
Watarrka 22.3 +0.6 28.7 24th 5.8 −0.5 −1.0 14th 0.9 16.6 average 5%
Yuendumu 23.6 +1.7 29.5 25th 8.4 +2.1 2.0 18th 0 13.1 lowest 0%
Yulara Aero AWS 21.2 +0.8 27.0 20th 4.9 +0.4 −0.9 17th 2.4 22.4 average 11%

Further information

NT Climate Services Centre
Bureau of Meteorology
Phone (08) 8920 3813
Email climate.nt@bom.gov.au