It appears that this fix may not work for those who have AppSync installed. Please remove it and reboot before attempting the fix. If you have already installed the updated packages please try to remove AppSync then reboot.
Launch Cydia from your SpringBoard.
Press to select Changes from the list of tabs at the bottom of the screen.
Make sure evasi0n 6.0-6.1 Untether and UIKit Tools are selected then click the Upgrade button at the top right of the device.
Click the Confirm button to begin installation.
Once installation has completed make sure to click the large Reboot button and not the home button. Once your device has rebooted you should no longer have issues with the Weather app or long reboot.
*For those who are still experiencing this issue after following these steps, expect another similar update to appear in Cydia shortly.