Index for total cloud cover as observed (FMI synoptic observations) at Kilpisjärvi twice a day: 06 UT and 18UT. Cloudiness varies from 0 (clear) to 8 (cloudy, when clouds cannot be observed e.g. due to fog the index is 9), and these are monthly averages. Curve plots are for the months of the optical observation season, and the histograms at the bottom are for the full years of 1996 and 2008.
