Well they are supposed to come into their own below 7degrees Celsius, so depends where you live but here in Kent we get snow every year and some pretty cold temperatures!! Also, I just had a quick look on Wikipedia and surprised to see that Englands average cold temp is below 7degress from October through to May!! with only June to Sept having average coldest temp above 7degreess! http://en.wikipedia.org/wiki/Climate_of ... ed_Kingdom Apparently, winter tyres have a higher Silica content than summer tyres which keeps them soft and pliable at colder temperatures, whereas summer tyres go hard and lose grip. Even on clear roads today, the difference in grip was noticeable. before i had them fitted i did some brake tests, stamping the stop pedal to see how easy it was to get the ABS to kick in. I then tried with the new winter tyres, and the grip level were a lot higher with ABS much harder to tigger. I then went and searched for snow to drive through and they were great - no problems climbing hills on uncleared, un-gritted roads... Im converted!!