Well duh, no road tyres are any good on ice, so the 888s wouldn't be any different
Well, duh, I'm pretty sure that -9 deg C would suggest the roads might be icy in the OP's post, otherwise what's the point they're trying to make!? You can now use 888s between 7 deg C and 3 deg C, whoop-ti-doo
Actually, you get ice with moisture. If there is no moisture, then there is no ice at sub zero temperatures. This is possible on days when the dew point is is far away from the outside air temperature. In layman's terms, a dry day. However, the colder the surface, the less grip you have.
Hope this wasn't too sarcastic