Australia is a huge country and has different climate zones.
First of all, don’t forget Australia is on the Southern Hemisphere, which means that summer and winter is opposite from the Northern Hemisphere.
Spring = start September
Summer = start December
Autumn = start March
Winter = start June
The Australian ‘Alps’ and the Tasmanian mountains have a mountain climate and the highest peaks are usually covered by snow all year-round.
The northern part of Australia
There is a tropical climate, which is hot and humid in Summer (December/January) and quite warm and dry in Winter (July/August)
The ‘middle’ part of Australia
Here you have the outback that exists of desert and bush. In summer temperatures can reach up to 50 degrees Celsius and sometimes there is no rain for months/years.
The ‘southern’ part of Australia
In summer daytime temperatures are usually between 25 and 30 degrees Celsius
In winter daytime temperatures are usually between 5 and 10 degrees Celsius
There is a cooler climate, which is cool and mild in Summer (December/January) and cool and rainy in Winter (July/August)
ACT = Australian Capital Territory
This territory has a continental climate. Relatively mild and wet in summer and cold winters.
Highest temperature – January 1939 = 42.8 degrees Celsius (Acton)
Lowest temperature – July 1971 = -14.6 degrees Celsius (Gudgenby)
NSW = New South Wales
The state has a temperate, humid subtropical and oceanic climate. In the South East cool to cold weather all year round and snow in winter.
In the southern half of NSW generally warm to hot in summer and cool in winter.
North West NSW very hot summers and cooler and drier winters.
Bordering to QLD hot and humid summers and mild winters with sunshine.
The coldest region is the Snowy Mountains.
Highest temperature – January 1939 = 49.8 degrees Celsius (Menindee)
Lowest temperature – July 1994 = -23 degrees Celsius (Charlotte’s Pass)
NT = Northern Territory
The territory has two climate zones.
In the Northern part (including Darwin) - a tropical savannah climate (high humidity and wet season (Nov-Apr) and dry season (May-Oct).
In dry season it is warm and sunny nearly every day.
In wet season there can be tropical cyclones and monsoon rains.
The Central region is arid/semi-arid, with very hot summers and relatively cool winters.
Highest temperature – January 1960 = 48.3 degrees Celsius (Finke)
Lowest temperature – July 1976 = -7.5 degrees Celsius (Alice Springs)
QLD = Queensland
Due to the size of the state there are different climate zones in the state.
Far north and coastal – hot humid summers
Hinterlands and south east coast – warm humid summers
Central West – hot dry summer, mild winters
Southern West – hot dry summer, cold winters
Inland South East – warm summer, cold winter
Highest temperature – December 1972 = 49.5 degrees Celsius (Birdsville)
Lowest temperature – June 1961 = -10.6 degrees Celsius (Stanthorpe)
SA = South Australia
Most of the state has an arid/semi-arid climate.
The couther coastal parts have a Mediterranean climate (mild wet winters and hot dry summers).
Highest temperature – January 1960 = 50.7 degrees Celsius (Oodnadatta)
Lowest temperature – July 1976 = -8 degrees Celsius (Yongala)
TAS = Tasmania
This state has a climate with four seasons.
Highest temperature – January 2009 = 42.2 degrees Celsius (Scamander)
Lowest temperature – June 1983 = -13 degrees Celsius (Butlers Gorge)
VIC = Victoria
In Victoria there is a semi-arid, hot (North West) and mild climate (along the coast).
Highest temperature – February 2009 = 48.8 degrees Celsius (Hopetoun)
Lowest temperature – June 1965 = -11.7 degrees Celsius (Omeo)
WA = West Australia
The south west corner of WA has a Mediterranean climate and the rest a hot arid/semi-arid climate.
The Kimberley has an extremely hot climate (monsoon) and a very long dry season.
Highest temperature – February 1998 = 50.5 degrees Celsius (Mardie Station)
Lowest temperature – August 2008 = -7.2 degrees Celsius (Eyre Bird Observatory)
Below info is from the website of Bureau of Meteorology (http://www.bom.gov.au)
October to April - maximum and minimum temperatures
May to September - maximum and minimum temperatures