Location in Weather Widget is Wrong

The location in the weather widget of the notification center is permanently wrong since September 2014. I was in Ampus for vacation. But today I'm at home and the location is not changing!

If I click on the i in the upper right corner, I can't change it manually.

Does somebody know a solution?

Press the i icon in the top right of the screenshot you provided. There you can change the location for weather. Edit

Did a quick search and it seems to be a bug in yosemite. Found a french website with a solution, link . it seems that the location for you weather is stored in ~/Library/Containers/com.apple.ncplugin.weather. I don't know if this is a temporary fix

Go System Preferences > Security & Privacy > Privacy [tab]
Uncheck and recheck 'Weather' and it's back to normal

See below img