The freezing, and in my case (stuck in reboot loop) may depend on if data can be being gathered and if it is all valid.
I was using CapeCoral Florida as the weather site and one day started getting no data for future days. (4 days out, and then 4 and 3 days out, and then 4 & 3 & 2 days out) When the days that had weather data passed, It was reboot city until I did a boot in R&D mode and cleared the flags.
I dont know if weather app uses a central weather data repository or gets it direct from a participating weather station.
It would also be cool it if could get Weather Bouy data.
http://ndbc.noaa.gov/maps/Florida.shtml