| 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 | 43.3 | 6.1 | 1957-01-18 | 21 | 0 |
| February | 88.8 | 9.5 | 1957-02-28 | 11 | 1 |
| March | 195.4 | 10.6 | 1957-03-27 | 5 | 6 |
| April | 214.2 | 13.0 | 1957-04-30 | 3 | 6 |
| May | 178.8 | 14.3 | 1957-05-30 | 13 | 6 |
| June | 342.1 | 15.1 | 1957-06-17 | 0 | 15 |
| July | 288.6 | 14.4 | 1957-07-05 | 5 | 10 |
| August | 278.9 | 13.5 | 1957-08-02 | 3 | 10 |
| September | 214.5 | 11.3 | 1957-09-07 | 2 | 4 |
| October | 228.0 | 9.8 | 1957-10-12 | 4 | 16 |
| November | 96.3 | 8.4 | 1957-11-14 | 15 | 5 |
| December | 36.8 | 5.8 | 1957-12-17 | 20 | 0 |