| 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 |
| 1977. | m_ss | m_sx | m_sxd | m_dsf20 | m_dsf80 |
|---|---|---|---|---|---|
| January | 40.7 | 6.6 | 1977-01-17 | 23 | 0 |
| February | 88.3 | 7.7 | 1977-02-17 | 12 | 0 |
| March | 174.3 | 10.8 | 1977-03-16 | 7 | 5 |
| April | 170.9 | 13.0 | 1977-04-17 | 9 | 4 |
| May | 238.3 | 14.5 | 1977-05-21 | 7 | 7 |
| June | 268.0 | 15.0 | 1977-06-02 | 4 | 7 |
| July | 244.0 | 14.1 | 1977-07-03 | 4 | 7 |
| August | 186.7 | 12.9 | 1977-08-05 | 7 | 3 |
| September | 165.8 | 11.4 | 1977-09-15 | 11 | 4 |
| October | 142.2 | 10.5 | 1977-10-04 | 11 | 8 |
| November | 83.8 | 7.9 | 1977-11-11 | 14 | 3 |
| December | 30.3 | 7.0 | 1977-12-12 | 25 | 1 |