McAllen, TX - true tropical winter - 77 average high, 65 average mean - hottest in U.S.?
someone else did a thread about SPI, so I did a little poking around the records to see if I could beat it.
Key west's average high was only 74 (same as South Padre Island) but its mean was higher because it has higher overnight lows owing to its humidty, so its mean was 69. There wasn't a day in McAllen that failed to reach the 60s, and it never dropped below mid 40s.
still, was this the hottest spot for winter in the continental U.S.?