Thank you for sharing this nifty work of yours. I wonder if it's possible to give a score based on all-year-round and a few specific criteria that the user care about.

For example, I personally found that I'm the most comfortable when the temperature is 23-26 C and humidity around 30-40%. If I could search for cities in the US which meets the above criteria (temperature and humidity) for as many month as possible in a year, that'd be a very useful addition to this already-impressive work.

Again, this is just a suggestion in case you pick this up again to develop more features. :) Thank you for sharing.