What should be protected from low temps?

[GardenTheater]

My outdoor furniture have covers on them where rain water accumulates. The second floor balcony gets more wind than our garden below. Last night, the rain water on the balcony froze from the wind chill on the balcony but it did not freeze on the ground where there is less wind. The answer to your question about temps higher up versus lower is...it depends. Cold and windy is worse than just cold. Good luck!