| 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 | 44.6 | 8.3 | 1977-01-28 | 24 | 1 |
| February | 75.6 | 7.4 | 1977-02-23 | 10 | 0 |
| March | 193.4 | 10.7 | 1977-03-16 | 8 | 7 |
| April | 173.3 | 12.8 | 1977-04-21 | 10 | 5 |
| May | 233.9 | 14.2 | 1977-05-30 | 4 | 7 |
| June | 289.1 | 14.5 | 1977-06-02 | 2 | 11 |
| July | 281.7 | 14.0 | 1977-07-13 | 4 | 8 |
| August | 242.2 | 12.7 | 1977-08-26 | 4 | 4 |
| September | 209.5 | 11.0 | 1977-09-12 | 5 | 5 |
| October | 165.6 | 10.2 | 1977-10-04 | 10 | 9 |
| November | 69.0 | 7.8 | 1977-11-11 | 18 | 2 |
| December | 52.3 | 8.0 | 1977-12-12 | 22 | 2 |