Adequate because it holds up to 5 inches, and here in the Sierra Nevada foothills we can get that much in 24 hours. It's on a post about 30 feet from a window and I can read it clearly when my glasses are clean. I had a 4" version of this very model but lost part of it when we moved here but that one was at least 10 years old and looked as good as new. Well; almost. Close enough anyway. So I assume this one will last at least another generation.