We generally let ours run thru all conditions except a known/forecast hurricane event. When we first put it up I would shut it down more frequently. What I've found is if your getting temps. where it is rain, turning to freezing rain, ...the blades will coat, but it will at least be even.
If, on the other hand, it has been stopped - either because there was no wind prior, or in this case it was shut down due to high winds - I'd favor letting it thaw. This event is probably past by now, but some of the scariest "whole lot of shakin' goin' on" I've ever seen is when, on rare occasion, you have one or two of the blades loaded up; one or two not. Couple that with a natural frequency with your tower and you can be running for cover.
~ks
