Many moons ago when I first got my Eunos, it had winter tyres on (september-ish) and in the hot sun they were great . . really sticky and tons of grip . I had a few surprises in the wet with the higher temperature . . I chewed through a few pairs of pants I can tell you
I did keep them on for the following winter . . and in the lower temps again very good
Ergo . . winter tyres are good in the cold crappy weather, but go real steady when its mild, not that cold and wet