I've been to Munich in mid-September (I left the day before Oktoberfest started) and even then, no pair of tights could even begin to keep me warm....the Wolford tights will probably do a better job of it than most, though.
More generally, I do love Wolford, but not for the opaque tights, which I would only wear when on holiday somewhere frrrreezing. I wear the everyday, low dernier stockings or hold-ups in off-black and skin colours for work, but have been having some bad experiences with them recently - they keep running, and developing holes, particularly around the toes, on the first or second wear, which is incredibly annoying given how expensive they are.
I tried Falke for the first time recently, and think I might be a convert. They are slightly cheaper but have so far been much more durable than the Wolford.