Try to turn on snow mode then check the windows again, maybe skerfur got stuck under the map and snow mode can fix that. Kerfur will remain in the "meat dimension" until you see skerfur.
Viewing post in Voices of the Void 0.8.2 Bug Reports
I had heard that as well but i had the large white wisp event that makes it extremely foggy once when i was trying to run around and do a bunch of stuff, not wanting to deal with it i scraped it just to see what would happen. It turned instantly sunny and the wisp was gone. Maybe it was just perfect timing though, lol