Fishin Guy said "This is the only province that I have seen close roads as much as they do. Why don't they salt or beet juice the roads instead? "
It's also Manitoba's geography. With a north wind you get lake effect anywhere on that whole section between Brandon and Winnipeg. Plus, the escarpment influences it too (elevation change). And the Red River Valley (giant funnel).
You don't deal with those geographic quirks in other places that influences the weather like that.