Remember that as the temp goes down in a sealed item the humidity goes up. I pack my ammo during the winter on a cold dry day. In AZ, that meant 40ish degrees and less than 10% humidity. My Radway 5.56 was packed at 39degrees and 6% humidity, why did I have nose bleeds again... Haven't done it yet here in Texas so I will have to dig out my humidity probe this winter and try to find a good day. Probably be a lot harder. I also don't reload ammo when it is humid either. I know some folks don't have much choice though.