The data is from The Argonne National Laboratory's Advanced Powertrain Research Facility https://www.sciencedirect.com/science/article/abs/pii/S0360319908011439?via%3Dihub
There's just as much chance of me driving on the motorway in the snow with 1% charge as someone driving with 1% of liquid fuel - not much. In a comparable situation, the BEV would last longer.
Anyway, how many times a year do you get stuck on the motorway in snow? I've been driving for 30 years and it's never even been close once?
While you're worrying about something that'll never happen, I've driven 36k miles virtually emission free and for ~1.5p/mile 👍