What is considered a "weather" issue?
A few years ago my mom shipped some packages to me via FedEx about 10 days before Christmas. There was weather in the Midwest and everything was delayed. It finally arrived at the facility closest to my house and was loaded onto the truck for delivery 3 days in a row but was never delivered. Their reason: the driver timed out every day. I finally drove down to the facility (60 miles away) on Christmas Eve so my kids would have their presents the next day. Compensation? Nope! Reason? Weather!
If FedEx can't hire extra drivers during their busiest season then how does it make sense to hire extra crews to stand by in random cities year round?