I know you were teasing (presumably owing to the
smiley...) but just incase...
Actually if it's sub 10C (or up to 7C can't remember) then winter tyres are actually more effective than summer tyres as the compound doesn't solidify like summer tyres do in low temperatures, therefore stay grippy at low temperatures. You can improve your traction
significantly in the cold and wet with winter tyres. Of course if it becomes mild then you'll just wear the winter tyres away and increase your mpg and actually winter tyres on a hot summers day are awful and just rip to pieces (I exaggerate a little).
It's not just about ice and snow, they are just more effective at low temperatures and wet conditions. It's been proven time and again that winter tyres in cold wet weather and in snow and ice, do perform significantly better, to the degree that I don't know why it is not a legal requirement in this country as it is in other European countries!