Hope so Donrae !
I'm in Australia - Canberra. One of the southern cities. Temp ranges from -6C on a few winter nights to a couple of 40C days in summer and we found that the Australorp (Bruno) from a batch of 4 different breed pullets we purchased 8 years ago coped with the temperature ranges well.
I purchased 6 fertilised pure breed eggs from a small property out of town when Bruno went broody (a couple of weeks after her only remaining companion died) - so no, not hatchery eggs as such. All six hatched out but 2 showed their true colours at about 10 weeks (attempted crowing and very developed combs and wattles) so they were returned to the breeder :( . The remaining 4 (1 out of the pictures) still have not started to lay whereas bruno started to lay at 20 weeks so I was starting to have my doubts.
Bruno was purchased as a six week old from a hatchery and we couldn't fault her. She has hatched out clutches of 6 twice and is such a great mother. She still gives us 3 - 4 eggs each week . Can't wait until I'm collecting more!