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
1939.m_ssm_sxm_sxdm_dsf20m_dsf80
January42.16.01939-01-09200
February107.58.81939-02-15102
March121.39.91939-03-21133
April259.012.81939-04-2739
May168.013.51939-05-17103
June298.714.71939-06-03110
July352.114.51939-07-05317
August248.813.21939-08-02712
September239.311.41939-09-05210
October71.48.61939-10-25161
November36.36.21939-11-09210
December58.37.11939-12-04201