Where about in Australia is Penrith? I'm just back from Western Australia and found the climate awesome compared to here in north east Scotland. I arrived in 39C which took a wee bit of getting used to but now the temps are down to 20s/30s. My eldest daughter lives there. She said winter is like our summer lol except sometimes not so cold but last winter it was particularly wet. My youngest spent her summer holidays there and was mortified that she missed our very unusually fabulous summer. My understanding is that the climate in Oz is so diverse from tropical to just like UK climate it really will depend on where Penrith is. Good luck to your son.