My parents are still out there, and farm, so phone conversations frequently revolve around weather.
Previous weather patterns can't be relied upon. November can be chilly and wet - by Aussie standards. It can also have successive days of +34C. December usually has 1-2 weeks where the temperature is over 37C every day, dropping to 26 at night.
This last summer, my parents found they were lighting their stove into December, which is unheard of.
Just like England's winter, Australian temperatures can swing rapidly. Three weeks ago, we had +14C during the day, 9C at night. Then it plummeted to -8C at night, -2 during the day. A 'chilly Aussie November day is 20C - perfect for cycling, so no need to worry about that. You just need to plan how to cope with the other extreme. At it's worst, cycle early morning and sit out the middle of the day's heat. It is very debilitating.
Oh, one more thing. The coastal regions of WA get a strong easterly wind every morning in summer. About 2pm this changes to a westerly. Every day.