Your 10-20 in Florida, and Yuma, AZ, may be the only areas that regularly survived the extensive cold snaps this winter past.
Wish we was there, too!!!
We just got back from a 15 day route that took us to Atlanta, Baton Rouge, then northwest to Amarillo and on to the 4 Corners, where we stopped at Mesa Verde NP, and then west to Monument Valley. Both were spectacular and worth the time. From there we headed slightly farther west to northern and southern AZ, and southern UT at Bryce Canyon, then north and home along I-70/I-76 through Colorado, and back along a typically windblown I-80. We added a last minute side trip southeast to Indianapolis, to check it off the State Capitols list, and then back north to Sarnia from there.
Although the temps yesterday in Port Huron. MI and Sarnia were probably the lowest we saw in the 15 day excursion, there weren't many relatively warm evenings or nights anywhere we stopped, except near Baton Rouge. It only got down into the mid 50F range overnight there. Just about every other stop got down much closer to freezing overnight. It got low enough one or two times that it caused us to use the furnace to keep ourselves and the tanks and lines warm, which was surprising since temperatures seemed to be rising here, just before we left.