Those of us who live in snowy regions can at times find it difficult to bike outdoors but depending on how adventurous you are it can be done.
The proper wardrobe is crucial if one is to cycle outside during the colder months. Winter cycling gear can be expensive but do some searching around on places such as ebay or bikenashbar and you can find some good deals.
Ok, here is my list of cycling essentials for winter riding.
1. Good base layer clothing (Craft etc....)
2.Windproof tights (bib style will keep you warmer)
3.Winter weight long sleeve jersey
4.Windproof insulated jacket
5.Lobster type insulated and windproof gloves.
7.Neoprene insulated shoe covers
8.You may also want to invest in some bib knickers and an insulated vest for those not so cold days too.
Layering is important, I have found that a few lighter layers is much better than one heavy layer.
As far as you choice of bike, I feel that either a cyclocross style or mountain bike works best for me. The speeds are slower and tires have more traction for bad road conditions. A lighting system both front and rear are good ideas as well unless you plan on riding only during daylight hours.
Even with all of the gear above, some days its just too cold and miserable to get out and ride so thats where an indoor trainer comes in to play. You can go as simple or elaborate as you like in this department but it is a valuable training tool for a cold weather athlete.
I wish you luck in your training this winter season!