| 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 |
| 1939. | m_ss | m_sx | m_sxd | m_dsf20 | m_dsf80 |
|---|---|---|---|---|---|
| January | 68.3 | 7.3 | 1939-01-19 | 19 | 2 |
| February | 112.2 | 8.9 | 1939-02-25 | 9 | 4 |
| March | 88.5 | 9.5 | 1939-03-05 | 18 | 1 |
| April | 241.0 | 12.8 | 1939-04-12 | 2 | 8 |
| May | 176.8 | 13.6 | 1939-05-17 | 11 | 4 |
| June | 296.5 | 15.2 | 1939-06-03 | 1 | 6 |
| July | 371.0 | 14.7 | 1939-07-05 | 2 | 22 |
| August | 265.6 | 13.5 | 1939-08-13 | 5 | 11 |
| September | 239.9 | 11.9 | 1939-09-01 | 1 | 11 |
| October | 98.1 | 9.3 | 1939-10-25 | 16 | 2 |
| November | 57.5 | 8.8 | 1939-11-09 | 21 | 2 |
| December | 66.2 | 7.2 | 1939-12-22 | 18 | 3 |