Working outdoors in cold conditions doesn't need to be uncomfortable, there are only a few things that need to be considered for you to survive like a Finn. The main thing is to keep your head and toes warm and dry.
Layered clothing is the key to comfortable shooting day outdoors, whatever the weather. The function of layered clothing is to transfer moisture, provide warmth, and protect from wind and rain.
When moving around, there are three layers involved: Inner layer, Mid layer and Shell layer. When standing, one more layer is added on top. Usually this layer is of fluff jacket and warm trousers. Do not wear cotton as it absorbs moisture and makes you cold very quick.
Also, remember to wear a warm hat that covers your ears against the cold. Warm shoes are equally important. Snow can also be slippery, so make sure that you wear solid winter boots with grooved (or even spiked) soles.
Snow can be a surprising element at times and preparations can never be taken too light-heartedly. Local production team members know their way in working in extreme conditions so that both you and your gear will be protected in changing weather.
If in doubt of what to wear and how to prepare, local businesses rent out winter gear and clothing and are happy to give advice. A good place to shop for winter clothing is the sporting goods store nearest to your hotel, as they have the best quality garments and the expertise to attire you and your crew.
To ease your preparations, here's a checklist for surviving a wintery shoot: