Yes they can... our latest pluss degrees with rain, which melted all the snow and ruined ice tracks, was supposed to be -15 all the time, forecast changed 5/6 days before. On the plus side it was supposed to last for a week, but only lasted 5 days (again changed). But hopefully it won`t happen again, nice winter is back and February is supposedly the coldest month of the year/winter. About time too to get some normal winter weather. Hasn`t happened for 4 years now, let`s hope 5. is the real one again. Started a bit late, but March is also still ahead.