AVAILABLE ALL-SKY DATA IN 1976 observation hours per month STATION JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC films (*) OULU 303 151 205 71 0 0 0 22 131 150 164 0 29 SODANKYLA 255 106 259 134 0 0 0 15 160 154 146 111 32 MUONIO 140 75 131 46 0 0 0 0 78 47 60 34 18 IVALO 129 87 154 47 0 0 0 0 59 73 124 46 18 KEVO 152 162 165 56 0 0 0 8 92 126 127 112 30 HANKASALMI 0 0 0 0 0 0 0 0 0 0 0 0 0 KILPISJARVI 0 0 0 0 0 0 0 0 0 0 0 0 0 KIRUNA 0 0 0 0 0 0 0 0 0 0 0 0 0 TROMSO 0 0 0 0 0 0 0 0 61 257 166 324 0 HORNSUND 0 0 0 0 0 0 0 0 0 0 0 0 0 ANDOYA 0 0 0 0 0 0 0 0 0 0 0 0 0 GEORG FORSTER 0 0 0 0 0 0 0 0 0 0 0 0 0 (*) analyzed films per year