| 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 | 74.7 | 7.8 | 1931-01-19 | 18 | 1 |
| February | 51.5 | 7.2 | 1931-02-21 | 18 | 0 |
| March | 148.5 | 10.2 | 1931-03-18 | 13 | 5 |
| April | 217.0 | 12.7 | 1931-04-25 | 8 | 10 |
| May | 314.1 | 14.3 | 1931-05-25 | 3 | 16 |
| June | 345.7 | 15.1 | 1931-06-28 | 1 | 14 |
| July | 364.0 | 14.9 | 1931-07-14 | 2 | 21 |
| August | 290.2 | 13.6 | 1931-08-05 | 3 | 16 |
| September | 115.2 | 11.1 | 1931-09-03 | 17 | 4 |
| October | 183.4 | 11.1 | 1931-10-06 | 7 | 10 |
| November | 115.9 | 9.5 | 1931-11-04 | 15 | 10 |
| December | 91.1 | 8.0 | 1931-12-08 | 15 | 4 |