It has been quite a while since the untethered jailbreak tool for iOS 6.x was released to public. Being the most popular jailbreak of all time, evasi0n brought along quite a few bugs. One of which was the annoying weather app crash.
After the bug was discovered, pod2g, the evaders team member, put out a short script to run on your Terminal while you had SHSH connection to your iOS device to fix the crashes. Surprisingly, this didn't work for most of the iDevices. A couple fixes also appeared in Cydia that promised to bring you back your stock weather app but they required a fresh restore and a re-jailbreak which sounded like a lot of hassle for most.