AVAILABLE ALL-SKY DATA IN 1993 observation hours per month STATION JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC films (*) OULU 0 0 0 0 0 0 0 0 0 0 0 0 0 SODANKYLA 423 267 230 119 0 0 0 0 106 289 30 182 25 MUONIO 231 263 133 62 0 0 0 17 124 186 109 119 21 IVALO 0 0 0 0 0 0 0 0 0 0 0 0 0 KEVO 0 205 139 57 0 0 0 4 155 172 226 166 17 HANKASALMI 0 0 0 0 0 0 0 0 0 0 0 0 0 KILPISJARVI 395 235 235 111 0 0 0 14 236 254 399 292 52 KIRUNA 0 0 0 0 0 0 0 0 0 0 0 0 0 TROMSO 0 0 0 0 0 0 0 0 0 0 0 0 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