| Description of elements in the header | |
|---|---|
| m_ss | amount of monthly sunshine duration |
| m_sx | the maximum sunshine duration in the month |
| m_sxd | the day with the maximum sunshine duration |
| m_dsf20 | number of days when the sunshine duration is less than 20 % of the astronomic sunshine duration |
| m_dsf80 | number of days when the sunshine duration is more than 80 % of the astronomic sunshine duration |
| 1991. | m_ss | m_sx | m_sxd | m_dsf20 | m_dsf80 |
|---|---|---|---|---|---|
| January | 91.8 | 8.9 | 1991-01-31 | 14 | 3 |
| February | 134.3 | 9.3 | 1991-02-18 | 8 | 5 |
| March | 120.4 | 10.8 | 1991-03-24 | 16 | 2 |
| April | 195.7 | 12.1 | 1991-04-22 | 5 | 2 |
| May | 181.0 | 12.9 | 1991-05-14 | 9 | 2 |
| June | 278.8 | 13.9 | 1991-06-09 | 2 | 9 |
| July | 261.5 | 13.8 | 1991-07-08 | 7 | 6 |
| August | 240.3 | 12.7 | 1991-08-08 | 6 | 8 |
| September | 221.1 | 10.9 | 1991-09-03 | 3 | 6 |
| October | 157.1 | 9.9 | 1991-10-04 | 10 | 9 |
| November | 89.4 | 8.5 | 1991-11-07 | 18 | 2 |
| December | 97.7 | 7.0 | 1991-12-15 | 13 | 1 |