Если по английски можешь то читай вот это, самый адекватный гайд на мой взгляд (градусы в фаренгейтах, чтобы перевести в цельсий (0 градусов цельсия = 32 по фаренгейту)
What to wear as it gets colder (in Fahrenheit)
60 degrees +: tank top or singlet and shorts
50-59 degrees: T-shirt and shorts
40-49 degrees: long sleeved T, shorts or tights or wind pants, sock or mittens and gloves
30-39 degrees: long sleeved T and T-shirt, tights and shorts, socks or mittens or gloves, and hat over ears
20-29 degrees: Polypro top or thick long sleeved T, another T-shirt layer, tights and shorts, mittens or gloves, and hat over ears.
10-19 degrees: Polypro top and thick long long sleeved T, tights and shorts, wind suit (top and pants), thick mitten, thick hat over ears.
0-9 degrees: Two polypro tops, thick tights and shorts (and thick underwear or supporter for men), Gore-Tex or similar thickness warm-up, gloves and thick mittens, ski mask and hat over ears, and Vaseline covering any exposed skin.
minus 15 to minus 1: Two thick Polypro tops, tights and thick polypro tights and thick underwear (and supporter for men), thick warm-up, gloves, thick (arctic) ski mask and thick hat over ears, Vaseline covering any exposed skin, thicker socks on feet and other measures for feet, as needed.
minus 20 and below: Add layers as needed. Stay in touch with the outdoor and ski shops for the warmest clothing which is thin. Watch your feet. There are some socks which heat up...and other innovations.