| 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 |
| 1931. | m_ss | m_sx | m_sxd | m_dsf20 | m_dsf80 |
|---|---|---|---|---|---|
| January | 65.2 | 8.0 | 1931-01-28 | 18 | 1 |
| February | 44.8 | 8.2 | 1931-02-04 | 20 | 1 |
| March | 142.7 | 10.3 | 1931-03-31 | 11 | 4 |
| April | 198.6 | 13.3 | 1931-04-26 | 8 | 8 |
| May | 313.7 | 14.5 | 1931-05-24 | 3 | 11 |
| June | 321.8 | 15.2 | 1931-06-28 | 2 | 11 |
| July | 364.5 | 14.5 | 1931-07-13 | 1 | 16 |
| August | 283.1 | 13.2 | 1931-08-05 | 3 | 14 |
| September | 127.4 | 11.5 | 1931-09-03 | 13 | 3 |
| October | 163.5 | 9.7 | 1931-10-06 | 10 | 9 |
| November | 95.1 | 9.3 | 1931-11-03 | 16 | 5 |
| December | 96.7 | 7.4 | 1931-12-09 | 14 | 3 |