Formulas are nearly useless
Posted by: Bnystrom on Jan-12-13 11:49 AM (EST)
In the spring around her, the water can be 40 degrees or less on days when the air temp is in 70 or more. Using that formula, you'd be dangerously under-dressed in the event of a swim. That's why I consider spring to be the most dangerous time of the year for paddlers; warm air lulls them into thinking that they can paddle in T-shirts and shorts, but the water is cold enough to kill.