A question for the all weather bikers out there....

So far I've managed to commute too and from work on the CG 5 days a week, every week, since March, but now the weather has turned (and we have snow!) I was wondering at what point you guys decide it's time to put the bike away? :-/

Luckily I live very close to the A4 so as long as I can get out of my road I'm on main roads all the way to work, and I've got good tyres with lots of tread, but when should I stop listening to the bit that loves being out on the bike (even in the freezing cold with 6 layers on!) and listen to the sensible mum voice telling me it's time to put two wheels away?