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Phoenix or Miami for the mainland. Some skilled statistician would be required to tell which is more likely and I suspect it is close. In fact it may well be that Miami is more likely to make it on January 1 but Phoenix will be hotter by a week or so in.
Honolulu of course for the US - 80 there virtually every day in January.
Moreover, that 81 degree day on January 7th was the only dayin the entire month of January when the high in Phoenix reached 80+.
You of all people should know better than anecdotes.
Try ten years of first ten days with some analysis of the variability.
And I would bet I can find a year when Miami did not get over 80 for the first week of the year.
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