Bureau of Meteorology Data

The following graphical information was extracted from Bureau of Meteorology (BoM) data on the internet at http://www.bom.gov.au/climate/averages in January 2005. The graphs contain comparisons in climate information between Arkaroola and Adelaide, Melbourne and Sydney.

Although the greatest of care was taken in preparing and graphing this data, please understand that whilst it contains official BoM data, it was not prepared by the Bom and is intended to be a guide only.

Data for each graph is based on long-term information gathered from each of the centres over the following periods:

  • Arkaroola: 66 years
  • Adelaide: 27 years (from the Kent Town location)
  • Melbourne: 96 years
  • Sydney: 146 years

Mean Daily Maximum Temperatures

Whilst Arkaroola is warmer during summer months than the other three centres, you will note that our winters are slightly milder. Note that the higher summer temperatures are usually accompanied by low Relative Humidity at Arkaroola (see separate graph below) – what we call a ‘clearer heat’ which is much more bearable than the high temperatures and high humidity often experienced in coastal centres.

Mean Daily Minimum Temperatures

As you can see, Arkaroola’s January mean minimum is about 20°C, only very slightly warmer than Sydney (at 18.6°C) and Adelaide at 16.8°C. Poor old Melbourne’s mean minimum during January is only 14.2°C.

During the dead of winter (July), Arkaroola’s mean minimum is about 3.2°C – but more often than not the sun will be shining brightly during the day! (Please see the graph on the number of clear days (i.e. cloud-free) further below.

Mean 0900 hours (9.00 am) Relative Humidity

During the summer months note that Arkaroola’s mean 9.00am relative humidity is around 40% compared to nearly 70% experienced by Sydney for the same period. As would be expected, Melbourne follows closely behind Sydney and Adelaide trails behind Melbourne because of their coastal locations.

Winter, of course, has high relative humidity in all centres – if it’s raining it’s got to be pretty close to 100% humidity!

Mean Rainfall (mm)

Arkaroola often receives more rain from thunderstorms during summer than winter. Perfect one day, even better the next!? Sydney well and truly takes the prize for the rainiest of the four centres. Interestingly, Melbourne is also pretty damp during winter but certainly drier than Sydney during the summer months.

Arkaroola often receives more rain from thunderstorms during summer than winter. Perfect one day, even better the next!?

Mean Number of Clear Days

This graph should convince everyone, particularly astronomers, from expert to beginner, why Arkaroola really is one of the best locations in Australia for tours of the universe! It’s just about perfect to enjoy all our other activities as well!

Mean Number of Cloudy Days

This graph also pretty much speaks for itself by comparing the mean number of cloudy days between Arkaroola and the other three centres.

Perfect for year round astronomical viewing at Arkaroola!  Our Summer night skies are spectacular!