I suspect I am among the majority of central N.H. car owners who just go all year driving the same all-season tires, all year long, and do not make the switch to winter snow tires.
A set of four winter tires, installed, costs about $550 and up, plus you need to store the non-winter tires, somewhere.
Driving the paved asphalt roads in central N.H. comes with incredibly excellent snow removal and road ice melt treatment that really makes driving the same all-season tires very doable for me.
How often do I drive on snow or ice covered roads? Not very much, maybe a couple percent, like 2% or something. I simply slow it down, slow it way down or stay home and do not drive when a snow storm hits the area. One day later the snow has been removed, and the roads are good to go. I figure there's maybe 5-days per year when a snow/ice storm blows in here and it's best to simply stay home, stay off the roads, and do not drive until the next day.
One can always go take a long walk somewhere, and wait till tomorrow to drive that car.
If you have a long steep driveway, or live down a remote unpaved road that requires more aggressive winter snow tires, you probably know what's best for you. ......