Only have made like $20 off Adsense, but I've got a lot more work to try and get this tool into passive mode:
* working on selecting a date range
* style up the site a bit more
* maybe have users so you can save searches etc
I get very valuable data that the travel industry would probably consider great leads, but I'm just figuring out what to do with it all.
Edit - and fill out these graphs: http://www.averageweather.io/monthly/boston/ma/12/