Try this if you updated the pkg (UIKit tools) in cydia and rebooted and the weather app still crashes. @planetbeing : https://twitter.com/planetbeing/status/299205571507257344 Guide: 1) Install iFile in cydia or use any filesystem manager for your idevice. 2) Navigate to \private\var\mobile\Library\Caches 3) Delete com.apple.mobile.installation.plist 4) iFile may unexpectedly quit but reopen iFile 4) Delete com.apple.LaunchServices-045.csstore 5) Reboot 6) You may notice some app icons on your springboard is gone 7) Wait patiently and the app icons will gradually reappear. 8) Try opening the weather app. This fix helped me and I hope it will for you too.