I agree with SUIScide. You definitely need to move to a warmer location. Either that or warm it over the campfire before you shoot. No problems here in Arizona!!! Just have to shoot early morning in the summer (3-4 months).
just work it back and forth a bunch. I've got a scope that does the same thing...once I give it a dozen twists, it loosens up significantly. On those cold days, I'll work the dial, set it where I like it and leave it.