When daytime highs don't rise above 70° F.
|The chart above shows Naples FL's|
daytime highs and nighttime lows
forecast for this Thanksgiving
and Thanksgivings past.
By that metric, South Florida was graced with three (3) consecutive Thanksgiving Days of winter-like (i.e. at or below 70°F) cool for the Thanksgivings of 2012, 2013 and 2014. The past two Thanksgivings have been warmer by comparison.
The good news: this year's won't be too warm.
A daytime high of 80 sounds perfect to me.