Just had a quick look. I believe the continental man was quoting average monthly minimum figures which indeed for the uk would cover October through to May. However this can becountered by saying the maximums figures would be more suitable for March through to December. Poetic licence i would accept.Even the official site claims "With temperatures dipping below 7°C from October through to March, waiting for the first snowfall before switching to winter tyres may be too late. Using cold weather tyres throughout autumn and winter could help you avoid becoming another accident statistic." Which would indicate that probably a 50/50 split is more likely. Even then it can be muddied further by the fact its probably not based on daylight time. I concede the guys info is probably highly biased towards the winter tyres
You've also go to remember that before daylight savings kicks in and darkness comes an hour earlier, that temps on your drive home will still be quite high. Once daylight savings hits and you're driving home in the dark, winter tyres come into their own