Riley Cruise surface data (winter) Yr Month Day Temp(C) 1952 2 15 NaN 1953 2 15 NaN 1954 2 15 4.9 1955 2 15 1.5 1956 2 15 2.0 1957 2 15 2.8 1958 2 15 1.2 1959 2 15 1.1 1960 2 15 2.3