There's a reason why they're called storm doors. Not only do they help to insulate the house, but you don't end up with wind-driven snow doing this sort of thing. This was in North Dakota, where 300 miles of the I94 freeway are shut down, but it's mostly due to wind. Further east is a bit worse: Davenport, Iowa, one of the Iowa-Illinois Quad Cities, got over ten inches of snow, while Chicago hasn't seen so much snow this early in the year since 1940.
Here, we have temperatures of as much as 32 degrees F, but we also have winds running 30 mph at the moment, with gusts to 50 mph. This makes it seem somewhat colder than 32. Nonetheless, there was an Anna's hummingbird dining at one of our fuchsias just a bit ago. How they manage remains a mystery.