2018 was not an unusual year here in Scotland, as astronomical observing and associated note-making are concerned.
Total number of nights where observations were made in 2018: 137
Percentage of nights available for observation in 2018: 37.5 per cent.
This is in accord with the claims of several British historical observers; T.W Webb, William F. Denning & Charles Grover.
For more details on this interesting topic, see my new book: Chronicling the Golden Age of Astronomy.