Description of elements in the header
m_ssamount of monthly sunshine duration
m_sxthe maximum sunshine duration in the month
m_sxdthe day with the maximum sunshine duration
m_dsf20number of days when the sunshine duration is less than 20 % of the astronomic sunshine duration
m_dsf80number of days when the sunshine duration is more than 80 % of the astronomic sunshine duration
1917.m_ssm_sxm_sxdm_dsf20m_dsf80
January39.87.11917-01-22230
February81.38.11917-02-28120
March88.99.61917-03-16181
April117.711.01917-04-30120
May306.813.81917-05-22212
June356.014.41917-06-25012
July305.214.41917-07-04010
August305.513.51917-08-04215
September268.611.61917-09-0619
October111.89.41917-10-01141
November73.58.31917-11-22173
December29.87.41917-12-16261