| 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 | 61.7 | 8.1 | 1977-01-18 | 20 | 1 |
| February | 66.0 | 7.9 | 1977-02-09 | 17 | 0 |
| March | 176.7 | 10.8 | 1977-03-25 | 10 | 10 |
| April | 168.6 | 12.4 | 1977-04-21 | 11 | 4 |
| May | 233.2 | 13.8 | 1977-05-26 | 6 | 4 |
| June | 277.6 | 13.7 | 1977-06-02 | 3 | 6 |
| July | 263.5 | 14.8 | 1977-07-13 | 4 | 4 |
| August | 194.8 | 11.9 | 1977-08-30 | 10 | 6 |
| September | 221.2 | 11.3 | 1977-09-02 | 6 | 9 |
| October | 186.4 | 10.1 | 1977-10-01 | 6 | 7 |
| November | 52.0 | 6.9 | 1977-11-21 | 20 | 0 |
| December | 45.3 | 7.0 | 1977-12-04 | 22 | 1 |