| 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 |
| 1981. | m_ss | m_sx | m_sxd | m_dsf20 | m_dsf80 |
|---|---|---|---|---|---|
| January | 93.0 | 7.5 | 1981-01-09 | 11 | 2 |
| February | 116.1 | 9.8 | 1981-02-25 | 9 | 3 |
| March | 132.7 | 11.5 | 1981-03-29 | 15 | 3 |
| April | 194.1 | 12.1 | 1981-04-17 | 7 | 7 |
| May | 217.3 | 11.9 | 1981-05-10 | 7 | 1 |
| June | 250.7 | 13.1 | 1981-06-28 | 4 | 2 |
| July | 238.2 | 13.1 | 1981-07-02 | 6 | 3 |
| August | 281.1 | 12.7 | 1981-08-06 | 1 | 7 |
| September | 169.6 | 10.8 | 1981-09-04 | 8 | 1 |
| October | 134.5 | 9.6 | 1981-10-09 | 11 | 3 |
| November | 59.9 | 8.4 | 1981-11-03 | 20 | 3 |
| December | 14.3 | 3.2 | 1981-12-21 | 28 | 0 |