Paul,
Better than Australia – I live in Texas!!
The wind shirt and wind pants are sized for layering. On cool nights I also wear a WM Flight Jacket, MontBell Down Pants & Sierra Designs down booties. I seldom wake up covered in sweat (fairly low humidity in Texas) so I assume that the moisture is moving to the outside. I’ve used this down to the mid 40’s on several occassions with good results.
I don’t consider myself to be a “normal” backpacker. I’m more of a dayhiker that just lays over for the night. I carry clothing/gear that protects me from rain, wind, insects and UV rays – so I feel that a tent is redundant. I carry insulating clothing that is suitable for the range of expected temperatures – so I feel that a sleeping bag is also redundant. Remember that Adm. Byrd’s crew did not use sleeping bags. They slept in their down parkas (per R. Jardine in his Pacific Trail Handbook).
The difference between a day hike and an overnighter for me is a ground cloth, some tent stakes, some triptease line and a flashlight. Has worked well for me up to now. It makes hiking a very simple experience.