Most cameras are more weatherproof than their manufacturers let on. The problem is that most users expect that "weatherproof" means it'll be ok if left out in a rainstorm like a forgotten toy, which is very much not true.

In my experience, any camera will easily survive a light snowstorm or light misting rain while slung over your shoulder or around the neck for short durations without any trouble. I've also used several cameras that are not waterproof or weatherproof in very bad conditions simply by keeping them protected until I'm ready to take a photo, then putting it away -- and never had a problem.

Weatherproofing protects your camera just a little more: it's just a little extra insurance to let you shoot in less than ideal situations. Dusty conditions, in particular, are helped by weatherproofing because the seals keep out the tiny dirt that can make a button gritty, for example. Weatherproofing will technically help keep water out in adverse conditions, but if you have the ability to shield the camera in such storms you'll be well off, too.

Note that you've specifically asked about the camera body only. Consider your lenses, too, which actually have more area for water to get in around the rings, focus extension, zoom extension, etc. That's the thing to really be concerned with, IMO.