I got a set of studded tires two years ago but I doubt that I will ever put much mileage on them. I've ridden them twice in two years. Our snow storms here are more intense than your's (20 cm is common and up to a meter is not unheard of) but the snow is of low moisture content (powder) and doesn't stick around for long either. For the last 30+ years, I've just used mountain bike knobs without problems. The studs are nice in those rare instances when the snow does stick around and turn to ice but, with a little skill, you can get by with a knobbed tire fairly easily. I keep my studded tires mounted on a spare set of rims and only change to the studs if the forecast calls for snow.