Okta

I like precision in all things, even in cloudiness. It's therefore terribly useful to know the word okta, which is the standard unit of measurement of cloud cover. It goes from 0 oktas (clear blue sky) to 8 oktas (completely overcast). I think we can all guess the etymology. Unusually, there is an occasional 9 okta measurement, which means something like too cloudy to see the clouds, although I'm a bit hazy on the subject.

It's curious that this should come to mind while I'm staying in the Lake District.

In the Lake District all of these are possible simultaneously.