My friend and fellow sauna enthusiast Dan told me that there’s a thing called the 200-degree club. You become a member by taking a sauna with a 200 degree difference between the temperature of the sauna and the outside air temperature. I was intrigued, but sure I could pull that off, at least in this first year of real sauna (wood-fired) ownership. Well, Mother Nature decided to help out couple of weeks ago, when we had -17 F temps. I …