[QUOTE=BushcraftHanger;853306]I would only plan to go on trips with 40 degrees or above nights.
Just for what it is worth, be careful, when thinking about minimal temperatures you might find yourself in. You might expect something around 40 F. however weather is a little fickle, you might end up in something colder, be sure you know how to take care of yourself if you find yourself in a colder enviroment than you expected.
The two places I live, we are always having people get into trouble when they are out enjoying nature and the temperature drops suddenly and totally unexpectedly. We all need to be prepared for the unexpected, one never knows what might happen. Snow and such can show up in the oddest places.
I remember the Cub Scouts that all drowned in their sleeping bags, while camped next to a lake in Montana. Nature is tricky sometimes. Be prepared.