My son and I just came back from an early spring overnighter in the Ottawa On Greenbelt just several miles from my house. The temp was -8 C overnight. It felt like July wrapped up in my JRB Mt. Washington 4 quilt set. The only sound of civilization was the odd vehicle in the distance but that was soon drowned out by the coyote serenade.
It's always nice to be able to test winter gear close to home in case you have to bail in the middle of the night. Another reason to camp in the city.