| 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 |
| 1957. | m_ss | m_sx | m_sxd | m_dsf20 | m_dsf80 |
|---|---|---|---|---|---|
| January | 65.5 | 7.1 | 1957-01-03 | 19 | 1 |
| February | 114.0 | 9.0 | 1957-02-26 | 10 | 4 |
| March | 201.8 | 11.0 | 1957-03-28 | 6 | 6 |
| April | 218.0 | 12.6 | 1957-04-30 | 6 | 5 |
| May | 170.6 | 13.7 | 1957-05-30 | 13 | 4 |
| June | 341.2 | 15.0 | 1957-06-16 | 0 | 16 |
| July | 315.9 | 14.0 | 1957-07-14 | 2 | 12 |
| August | 294.9 | 13.3 | 1957-08-18 | 3 | 14 |
| September | 206.2 | 11.0 | 1957-09-09 | 3 | 6 |
| October | 185.2 | 10.1 | 1957-10-09 | 9 | 11 |
| November | 102.6 | 8.5 | 1957-11-05 | 11 | 4 |
| December | 45.3 | 5.0 | 1957-12-04 | 20 | 0 |