I record partially clear nights based on whether some observing is possible, so it could be the sky is partially clear during the night or the sky is completely clear for a period then overcast.
2019 was definitely down on my average of 155 recorded over the last 16 years.
Clear and partly clear nights for 2019 – 142
Away on holiday for 10 nights
Worst month November 6 nights
Best May and July 15 nights
I made observations on 78 nights which is 59% of observable nights.
Rob Januszewski