| 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 | 54.4 | 7.8 | 1931-01-22 | 20 | 4 |
| February | 91.3 | 9.1 | 1931-02-24 | 13 | 4 |
| March | 143.0 | 10.1 | 1931-03-21 | 11 | 3 |
| April | 233.6 | 12.9 | 1931-04-16 | 5 | 10 |
| May | 322.7 | 15.0 | 1931-05-29 | 1 | 11 |
| June | 322.5 | 14.9 | 1931-06-29 | 1 | 11 |
| July | 304.7 | 14.8 | 1931-07-16 | 4 | 11 |
| August | 271.0 | 14.0 | 1931-08-04 | 3 | 9 |
| September | 129.9 | 11.2 | 1931-09-09 | 14 | 2 |
| October | 160.9 | 9.3 | 1931-10-07 | 9 | 5 |
| November | 101.7 | 8.6 | 1931-11-04 | 13 | 5 |
| December | 77.8 | 7.6 | 1931-12-01 | 16 | 5 |