Aberdeen is considered the coldest city in South Dakota according to Google.
Average Weather in Aberdeen, South Dakota, United States, Year Round - Weather Spark
Honestly, it doesn't look THAT bad. Summers are long and warm. Precipitation isn't excessive in the winter so no mountains of snow, but you'll likely get some of the white stuff.
A set of studded tires should keep the dart on the road through the winter.
But any non-desert place risks massive rust issues. Start planning for some sort of corrosion protection! I'd be looking at a backpack sprayer full of something like liquid film or LPS3 to spray the entire underside of the car and all the suspension and trunk interior every season, and a pressure washer to get any road grime and salts or snow-melt chemicals off the car. Even if you don't drive in the snow/rain, that stuff is in all the road dust and causes a lot more undercar corrosion than us southwestern inhabitants are used to - especially in spring when the weather suddenly looks nice and you just can't help yourself.