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
1977.m_ssm_sxm_sxdm_dsf20m_dsf80
January52.17.11977-01-08221
February88.98.81977-02-27111
March164.910.11977-03-1685
April166.511.81977-04-21113
May248.813.71977-05-2946
June284.914.01977-06-09310
July270.114.91977-07-1629
August230.512.81977-08-0878
September182.310.61977-09-0384
October145.39.91977-10-0883
November76.98.21977-11-04151
December42.97.01977-12-04221