OK!
It works with airport codes instead of zip-codes... So the users has to enter a 4-letter airportcode instead of the us zipcode...
These airport codes are not logic, so a scrollmenu were one can preset names that correspond to the codes would make this usefull...

(empty menues that we could populate ourself...) Possible?
My nearest airport is Sogndal-Haukasen - the code is ENSG and the weather is:
http://www.weatherroom.com/forecast/ENSG.html