Melvern You bring up an excellent point Yes X mas of 1988 Miami had Frozen pipes. I know because My Sister in Law's house had exposed PVC pipe that I thawed out with her hair drier. Over the years we have had a few winter blasts. When I lived in Boca Grande we had a super warm winter (1994 or 95??) and everything flushed. The last week of Feb and first week of March we had 3 freezes a few days a part on a Tropical Island mimi climate. Needless to say it took two years to recover. My area has had 3 years running with Freezes. I personally lost struggling Mango trees in the second year of freezes. After 3 years in a row it is time to rethink more cold hardy plants. However the Market is still demanding Tropical Disneyland in my area. I am now semi retired but I did have a nursery blown away by Hurricane Charlie. Freeze protection started by moving tender vegetation into shady houses covered each winter with Visqueen. But I would run my sprinklers heavy all day long before the expected freeze. I would then turn them off at night fall and hope for the best. Water holds heat and the heavy water on the ground helped to keep my stock from freezing. I was luck and did not lose very much to freezes. As for your spotty freeze damage. The direction and speed of the wind is what cause that. If you look close you can see a Patten on which side of the house etc was up wind (little damage) or down wind (more damage). No wind will freeze or frost quicker.