I think my T and marriage counselor technically charge for missed appointments, but I think that's more for just not showing up and not calling. Or if someone is chronically cancelling at the last minute without a good reason. I know we had to cancel at the last minute on our marriage counselor once because our daughter was sick, and he confirmed he wouldn't charge us, like, "Of course I wouldn't charge you for that."

To add more in terms of weather, they both live considerably further from the office than me, so chances are, if I couldn't get there (like a bad snowstorm or ice storm), they couldn't either. And occasionally it's not so much that I wouldn't want to drive in the weather, but that the condo association hadn't plow our parking lot yet, so I literally couldn't get out.