You'll want winter tires on well before the air temperature hits freezing for water. Forecasts aren't that predictable, and bridges (no earth heat sink underneath) will ice over before roads do.
40 F is a good time for getting winter tires on.
As someone who lives in a humid, wet area that goes from -40 at night in winter to 100+ F in summer, I also vastly prefer Fahrenheit.
The difference between 60, 70, 80 and 90 is pretty profound with humidity, and the same is true in winter. I don't think I've ever set a thermometer to freezing or boiling, ever. All of my kitchen appliances have numbers representing their power draw.
40 F is a good time for getting winter tires on.
As someone who lives in a humid, wet area that goes from -40 at night in winter to 100+ F in summer, I also vastly prefer Fahrenheit.
The difference between 60, 70, 80 and 90 is pretty profound with humidity, and the same is true in winter. I don't think I've ever set a thermometer to freezing or boiling, ever. All of my kitchen appliances have numbers representing their power draw.