| 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 | 53.3 | 7.1 | 1977-01-28 | 20 | 0 |
| February | 73.6 | 8.3 | 1977-02-13 | 13 | 1 |
| March | 165.3 | 10.6 | 1977-03-24 | 10 | 4 |
| April | 177.5 | 12.8 | 1977-04-21 | 8 | 1 |
| May | 244.5 | 13.4 | 1977-05-25 | 3 | 3 |
| June | 298.2 | 15.1 | 1977-06-13 | 2 | 12 |
| July | 276.7 | 14.6 | 1977-07-13 | 5 | 9 |
| August | 233.4 | 12.2 | 1977-08-07 | 4 | 5 |
| September | 208.6 | 11.4 | 1977-09-14 | 6 | 8 |
| October | 170.9 | 10.0 | 1977-10-04 | 8 | 7 |
| November | 72.7 | 7.0 | 1977-11-12 | 16 | 0 |
| December | 43.9 | 6.5 | 1977-12-12 | 22 | 0 |