Facing a 10 meters per second wind (20 knots) at 0 C equals a windchill factor of -15 C. Meaning that at -15 C and no wind, you would feel equally chilled. Struggling against the wind, this young lady could not even put her leather clad hand in her pocket, as her wool hat needed assistance in order not to become airborne. I just went for a walk. A short one. Brrrrr.
Not surprising, really, that Denmark has such a large wind power industry, given the fact that we're so windblown.