We are expecting a few hours of freezing rain tonight. The last time this happened we had widespread power outages. Ours was out 48 hours. I think our tub was at 102 that day, or maybe cooler as we were planning on going out of town. 2 days later when the power came back on, it was still at 95. I decided to put it at 104, as that might give me a couple extra days of freezing protection.
