I have a collection of similar sites, each with pros and cons. It would be wonderful if they can be integrated into one.

http://travel.usnews.com/New_York_NY/When_To_Visit/

Pros: Comments on festivals, etc. Cons: Limited to large cities.

http://www.thebesttimetovisit.com/we...icherville.php

Pros: With filters to search by time, etc. Cons: Search results are by month only.

https://www.timeanddate.com/sun/new-zealand/queenstown

Pros: Sunrise and sunset, tidal, etc. for photographers.

These sites have both metric and US/UK units.