I don't protect from wind and rain, except that the pelargoniums are under a slight porch overhang. It is only on cold nights I use the plastic containers and have found them effective down to about -3. Any lower than that and I lug the all plants into the garage.
Works for me ... but, as I say, I am almost as south as you can get. It can be pretty windy, but we only get a sprinkling of snow about once a decade and scrapping frost off the car windows is not a regular chore.
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