| 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 | 54.1 | 6.2 | 1931-01-19 | 19 | 0 |
| February | 40.0 | 8.1 | 1931-02-09 | 20 | 1 |
| March | 130.6 | 9.1 | 1931-03-05 | 10 | 1 |
| April | 160.0 | 12.5 | 1931-04-26 | 12 | 2 |
| May | 291.5 | 14.2 | 1931-05-28 | 5 | 10 |
| June | 274.0 | 14.6 | 1931-06-28 | 4 | 6 |
| July | 271.0 | 13.9 | 1931-07-23 | 3 | 5 |
| August | 185.7 | 12.9 | 1931-08-05 | 10 | 2 |
| September | 111.8 | 9.9 | 1931-09-03 | 14 | 0 |
| October | 141.9 | 8.9 | 1931-10-06 | 12 | 0 |
| November | 48.8 | 7.9 | 1931-11-03 | 22 | 0 |
| December | 84.1 | 7.2 | 1931-12-09 | 14 | 1 |