Weather

[TiggerCCW UK]

How do you represent the effects of weather and temperature in Twilight? The next stage of my campaign is going to be Armies Of The Night and I'm planning on putting in some very cold, icy and snowy weather. How would you recommend representing this in game? I'm thinking of minuses to movement in snowy or icy conditions, minuses to agility where appropriate but I'm not sure about how to play extreme cold. Minuses to agility and movement for bulky clothes? Any suggestions welcome.