On 2006-04-04 12:10:45 -0400, "Bob" said:

The weather has little to do with it since you'll be in the water. If I
remember correctly water conducts heat about 400 times more than air.
Water temp is easy to determine. Get the surface temprature in the area
you plan on sailing. If 10 miles off get that temp not the temp at the
beach where it is shallow and much watmer. Several places may have the
temp. Talk to any of the State Fish & Wild life biologist or USCG Aux
who give cold water survival classes.

Actually, it's only about 25x better than air... if it was 400x better
than air, it would heat up a hell of a lot faster than it does.