| Description of elements in the header | |
|---|---|
| y_ss | amount of yearly sunshine duration |
| y_sx | the maximum sunshine duration in the year |
| y_sxd | the day with the maximum sunshine duration |
| y_dsf20 | number of days when the sunshine duration is less than 20 % of the astronomic sunshine duration |
| y_dsf80 | number of days when the sunshine duration is more than 80 % of the astronomic sunshine duration |