And if I was NORDO, what would I do?
If it was severe clear, I'd land.
If it was cloudy, I'd shoot the approach and try and land?

I haven't read any FAR that indicates that the latest weather obs must be hourly. And, I have landed at several airports with ATIS 2-4 hours old.

I can't depart without knowing the current obs and forecast, so, I just don't think diverting on a severe clear day is the appropriate response in general.
At FedEx, we'd be on the carpet tap-dancing if we diverted in this situation.