Listen to potter water! Certainly boating is do-able at Powell in the winter, but I doubt that rental houseboats are to be out past the end of November or before the first of March. We have only boated May thru Oct. Had bad weather in the
Summer, but usual short duration. Usually we spend a month, and at least once or twice see 40 to 50 knots of wind and some rain during our stay in thunder squalls.
We enjoy the Sept thru Oct weather the best; The water is warmer than the Spring. The evenings tend to be cooler in Sept on, and we have never needed air-conditioning, but do use a fan at night.
We have several sources of weather--VHF Marine Radio weather bands are available in most coves. We get satellite weather from Phoenix--and that gives you a good idea of what is coming. AM radio stations are available, and again they can give weather conditions in nearby towns. Temperatures at Page, AZ are pretty close to those at Shasta in the summer--the "official lake" temps are cooler. But on land, in the shade in the mid to high 90's is not unusual.
Frequent Sea (C Dory 25,) was sold to a gentleman who keeps her in the Marina year around. She was still there last Oct.
Dangling Rope officially:
Seasonal staff are here from March through October. A couple of these hearty souls live here year-round to ensure that Dangling Rope Marina is open every day.
We talked to a "Caretaker" lady who said she was the only person there during the months of Dec thru Feb. So I would suspect that any services were minimal.