Boomer’s advice is great for when it is bitterly cold – think less than 25F / -4C. The same lessons I learned from going skiing in 15F weather apply then.
The corollary of the dress warmly advice is don’t dress too warmly!
When it is not quite so frigid, bar mitts and lighter weight gloves are enough to protect your fingers. Wear layers, including a windproof outer layer, but don’t break out the ski parka if it’s only 45F / 7C. Thermal tights are great. If the temperature is variable, carrying 2 different weights of gloves and a hat and lightweight balaclava can often be enough to keep you comfortable, since you can remove and change up these things easily.
