- 
                        1. Average total and low cloudy weather 
- 
                        2. Repeatability of cloudless sky (0-2 points), variable cloud cover (3-7 points), cloudy (8-10 points) 
- 
                        3. Number of cloudless and cloudy days within 1 month 
- 
                        4. Number of cloudless and cloudy days during 1 year 
 
                         
                        