I also love running in the cold, especially when its crisp and clear 
Only problem is now...... it is snowy/icy! Doubt i'll be getting a PB if i'm on my bum!
I remember running whilst it was snowing ans very windy last year it was burning my face but still carried on and felt great after! got some funny looks but really felt liked i'd acheived something for the rest of the day. (probably was a bad idea on the windy roads in the brecon beacons tho!)