It wasn't just the '60s that suffered from snow induced flameouts. I lost both engines in snow in NI (with a fully modded Mk2 - mod 1051 nose door with air heating of the nose door intake panels*) even though above the limits for flight in snow, and I understand that other crews on task also checked their ac on hearing of my predicament and found a number of them nearly blocked! It seemed it was 'the wrong kind of snow'.
* - not an anorak - I have the Mk2 FRCs in front of me!