It only snows when it's warm (say, -10 C). Plows smear the snow into a thin layer. Then a high moves in so the temperature drops and you get asphalt covered in

It only snows when it's warm (say, -10 C). Plows smear the snow into a thin layer. Then a high moves in so the temperature drops and you get asphalt covered in sheer ice that just gets polished by the sun and subsequent plowing. In some places there's Winter, not just the pause between autumn and spring.