After running the Evasi0n Jailbreak all users have a problem with the stock Weather app. pod2g has just announced a way to solve it, but it is only for advanced users, and soon everyone will be able to solve this problem by simply installing a package from Cydia.
In an article published on his own blog(check here), Pod2G provides an explanation for the problem and a script that must be run to resolve, but only those who know how to connect via SSH to iDevice, or those who know how to work with Mobile Terminal can use that script.
An update will be published soon in Cydia for evasi0n and it will automatically repair weather application for everyone, so we only need to be patient for a few hours so you can fix your application on all terminals.
Update : Team Evad3rs just pushed two new updates of evasi0n 6.0-6.1 untethered and UIKit Tools to fix the long reboot issue and Weather app issue. The fixes can be applied easily by updating the evasi0n 6.x untether and UIKit Tools packages in Cydia.