Tonight's low around the lake will be in the upper teens. The wind chill will be in the singe numbers. Wind chill is the overall affect on exposed skin. Therefore, your boat will see the upper teens, not the single numbers.
I suggest you bundle it up as good as you can. If you can safely place a 60W drop light near the engine, that will also help. You can also wrap your lower unit in heat tape, the stuff that is used to keep exposed pipes from freezing.
Good luck!
R2B
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