| 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 | 61.9 | 6.7 | 1939-01-09 | 17 | 0 |
| February | 120.6 | 9.0 | 1939-02-15 | 8 | 2 |
| March | 135.1 | 9.7 | 1939-03-17 | 7 | 1 |
| April | 234.8 | 12.4 | 1939-04-27 | 4 | 9 |
| May | 168.9 | 12.5 | 1939-05-03 | 11 | 3 |
| June | 269.8 | 15.1 | 1939-06-08 | 5 | 11 |
| July | 311.8 | 14.4 | 1939-07-03 | 4 | 13 |
| August | 266.0 | 13.1 | 1939-08-07 | 4 | 12 |
| September | 210.8 | 10.9 | 1939-09-11 | 5 | 7 |
| October | 59.7 | 7.1 | 1939-10-25 | 17 | 0 |
| November | 37.2 | 8.8 | 1939-11-07 | 24 | 1 |
| December | 69.4 | 7.6 | 1939-12-22 | 18 | 2 |