Here is Woife's weapon against cold fingers:
"Hi everyone, in the winter season I have about 30 winter surfing days in Bavaria, with air temperatures between -2° and +5° and water at 2-5°C, which results in a wind chill of -20°C or more, depending on the wind strength.
That's why my motto is: double is better! I use thin, closed finger gloves (2 mm thick in my case) and cut them out on the palm for a better grip. Ideally, they should fit snugly and be one size smaller.
The fingers are completely protected by neoprene, the mitten on top keeps the wind and water out and you still have a good grip on the boom. I can windsurf for up to two or three hours in the snow and cold.
A few more winter tips from me:
Greetings from Lake Chiemsee, your Woife