You should take into account humidity, seeing as the best humidity level at say 80ºF or even 70ºF is very much more pleasant than the worst.
Also, IMO your minimum temperature criterion is probably a mistake. Nobody cares that it's a little chilly at 4am, and meanwhile you're selecting for more humid climates (because those have less diurnal variation).
If you wanted to make the selection criteria user-adjustable, though, I'd be really interested to see the results. (Also, nice job on the visualization, discretizing every grid square to a town is particularly cute.)
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You should take into account humidity, seeing as the best humidity level at say 80ºF or even 70ºF is very much more pleasant than the worst.
Also, IMO your minimum temperature criterion is probably a mistake. Nobody cares that it's a little chilly at 4am, and meanwhile you're selecting for more humid climates (because those have less diurnal variation).
If you wanted to make the selection criteria user-adjustable, though, I'd be really interested to see the results. (Also, nice job on the visualization, discretizing every grid square to a town is particularly cute.)