This is pretty impressive, i wonder what the update interval and source is.

http://www.mapbox.com/labs/forecast/temperature/ I really like the interface, even the zoom buttons could be removed or hidden as you can scrool-zoom.

Make the temperature in Celsius please!

EDIT: There seem to be a problem with the algorithms, the largest zoom displays colder temperatures( look at the temperature map ).

Largest zoom,

http://i.imgur.com/GVt3iSy.jpg

Normal zoom, picture was resized by me

http://i.imgur.com/t1GgrOM.jpg