Riley Cruise surface data (summer)
 Yr Month Day Temp(C) 
1952  7 15  20.2 
1953  7 15   NaN 
1954  7 15  21.4 
1955  7 15  21.6 
1956  7 15  21.6 
1957  7 15  21.9 
1958  7 15  21.0 
1959  7 15  21.3 
1960  7 15   NaN