Don't know about those folks, but down here we have a "120 rule". If air temperature and water temperature combined don't equal 120 F. conditions are considered too extreme!!!! <img src="http://www.catsailor.com/forums/images/graemlins/laugh.gif" alt="" />
I'm serious! <img src="http://www.catsailor.com/forums/images/graemlins/shocked.gif" alt="" />
I have a thud and a push rule.
If there is too much snow / ice to get the plates in the boat, it too cold (the push rule)
If I push the boat down the slipway and it goes thud (and not splash) it is too cold to sail......(the thud rule).
