21°S 140°E The Brothers – Queensland by Degrees

THE POINT

Degree confluence 21°S 140°E, Google Earth

sit

 

IN THE DEGREE SQUARE

loc

Climate: The closest representative weather station is at Mount Isa, which is 60 km to the north-west of the degree confluence, and has an elevation of 340 m.

 

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

Mean max
(ºC)

36.3

35.3

34.3

31.9

27.9

24.8

24.7

27.2

31.2

34.6

36.4

37.1

31.8

Mean min
(ºC)

23.8

23.4

21.8

18.5

13.9

10.1

8.6

10.3

14.3

18.6

21.4

23.1

17.3

Mean rain
(mm)

118.8

99.4

62.6

15.9

12.6

6.3

6.1

4.0

6.7

19.7

35.2

70.0

459.6

The highest temperature recorded was 45.9°C in January 1990, and the lowest was -2.9°C in both July 1984. The highest rainfall in a year was 917.0 mm in 1997, and the lowest was 161.1 mm in 1970. These and other climate statistics for Mount Isa can be found at: Australian Bureau of Meteorology, http://www.bom.gov.au/climate/averages/tables/cw_029127_All.shtml.

Extremes of Nature: Since 1906 there has not been any tropical cyclones to pass within 50 km of the degree confluence, although 11 have passed within 200 km, despite the area's relatively inland location. Cyclone information for this area and all of Australia can be found at the Australian Bureau of Meteorology website, http://www.bom.gov.au/cgi-bin/silo/cyclones.cgi.

cyc

Cyclone tracks within 200 km of point 1906 to 2006 (Bureau of Meteorology web site)

The area experiences extreme heat for much of the year, with an average of 121 days annually that have maximum temperatures equal to or over 35°C. Despite Mount Isa's substantial average rainfall, the area only experiences 49 days a year with rain, most of which occur in the summer months. Very dry conditions prevail from April to October.

Today:

The total population of the degree square at the 2011 national Census was 10,121, most of it within the part of Mt Isa that falls within the square.

MEASURE

1996

2001

2006

2011

Total population

10,076

9642

9185

10,121

Total males

5234

4945

4652

5248

Total females

4842

4697

4533

4873

Under 5 years

1057

993

984

997

65 years and over

419

543

440

626

Indigenous

1492

1665

2018

1846

References to Come

Information: Ken Granger

Climate information:  Jo Grant

Edited by:  Hayley Freemantle