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
1931.m_ssm_sxm_sxdm_dsf20m_dsf80
January74.77.81931-01-19181
February51.57.21931-02-21180
March148.510.21931-03-18135
April217.012.71931-04-25810
May314.114.31931-05-25316
June345.715.11931-06-28114
July364.014.91931-07-14221
August290.213.61931-08-05316
September115.211.11931-09-03174
October183.411.11931-10-06710
November115.99.51931-11-041510
December91.18.01931-12-08154