The average temperature in Sydney the average temperature is 36.63 degrees in summer, with precipitation around 9.0 mm , Mount Isa, QLD's temperatures reach 41.69 during the hot season, with 9.0 average of rain rate . In winter, however, weather indicators show around 2.71 degrees in Mount Isa, QLD, compared to the 2.8 average degrees reported in Sydney. During the winter period, Sydney can register 3.0 mm precipitation, while Mount Isa, QLD have an average of 2.3 mm rain level.