Winter Weather - Florida v. Northern U.S. - 1939: On average, Florida has the mildest winters in the Continental United States. Average lows range from 65 °F (18 °C) in Key West to near 41 °F (5 °C) degrees Fahrenheit at Tallahassee, while daytime highs range from 64 °F (18 °C) at Tallahassee to 77 °F (25 °C) at Miami. This Linen Era postcard, published in 1939, seeks to play up this contrast by showing Florida's beach-friendly winter versus the snow shoveling North. The postcard is in good condition. Genuine Curteich-Chicago. “C.T. Art Colortone”. No. 9A-H1682. Thomas B. West. Miami. No. M-150.