I have taken this bag from New Mexico to Montana during every season of the year. I have over 150 nights in this sleeping bag ranging from -17° to 85° and I have zero complaints. The materials used to construct this bag are very comfortable and it has kept me comfortably warm on some pretty cold nights. Obviously it does get warm on hot summer nights but during those times I use it as more of a blanket than a sleeping bag.
Definitely worth the money.