A couple of weeks ago on a clear morning after days of moisture, there was much dew to be found around. I was a little surprised to see this window with condensation (on the outside) leaving the clear circle in the middle. It’s a north-facing window (and wouldn’t have seen any direct sunlight that morning). It’s mysterious to me how/why this happened. I’ll try to remember to check for it on future mornings with heavy dew.
If you have some ideas on what happened, I would be happy to hear them – please leave a comment below!