If you use hot melt, and I have absolutely nothing to go by except my gut feeling, I think the glue just gets brittle and doesn't hold as well in cold weather. I also think the glue just gets old and quits holding as well as it used to, so I reglue my points several times a year - assuming my arrows last that long.[&:]

Epoxy eliminates the problem, but you're pretty well stuck ([8D]) with whatever points you put on the arrows.