59° 58° 57° 56° 55' 



53° 52° 51° 50° 49° 48° 47° 46° 45° 44° 



59° 58' 



56° 55° 54° 53° 52° 51° 50° 49° 48° 47° 46° 45° 44° 43° 



Figure U. — Ice conditions, March 1961. Figures indicate day of month ice was sighted or reported. 



