GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project
 National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970

 Site No. 131, Approximate Location: 45.77 N. Latitude, 84.14 W. Longitude
 Site Name  Spectacle Reef                 on Lake Huron        
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 Year Mo Da   T1   T2   C1  T1C1 T2C1  C2  T1C2 T2C2  C3 T1C3 T2C3  IMAGE   Supplemental Information
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 1915  3 23   -1   -1   OW   -1   -1        -1   -1       -1   -1  108.TIF                                   

 1947  2 19   -1   -1   OW   -1   -1        -1   -1       -1   -1  324.TIF   TO A LINE EAST OF HARBOR BEACH  

 1951  3 26   -1   -1   IP   -1   -1        -1   -1       -1   -1  363.TIF                                   

 1959  3 23   -1   -1   FD   -1   -1   SI   -1   -1   SW  -1   -1  427.TIF   TO THUNDER BAY                  

 1961  2 27   -1   -1   SO   -1   -1   BV   -1   -1       -1   -1  440.TIF   WESTWARD                        
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 Ice thickness is in inches, -1 = no thickness reported, see report for ice conditon codes.
 T1 = ice thickness or part of a range if T2 is present,  C1 = primary condtion of ice.
 T1C1 = thickness of C1 or part of range if T2C1 is presnet.
 C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.