WHOLE VOL. 



LAT. 40 N. 



545 



SEA-LEVEL PRESSURE AT 10° INTERSECTIONS 



Lat. 40° N. Long. 90° W. 



950 mb. + 



Sate Jan. Fell. Uar. Apr. May June July Aug. Sept. Oct. Not. Dec. Year 



67.4 67.9 68.5 68.2 70.7 69.2 



66.3 67.3 65.8 



64.2 67.7 66.7 



64.3 65.8 69.5 



66.2 66.6 63.8 

 64.7 66.4 66.2 



66.3 66.0 67.7 

 64.2 65.5 66.4 

 65.5 67.2 68.8 

 64.7 66.7 67.0 



70.0 

 68.6 

 65.8 

 69.8 

 68.9 



70.0 

 69.6 

 72.2 

 68.7 

 67.6 



70.0 

 69.6 

 70.9 

 70.0 

 70.7 



71.6 70.4 72.0 



68.5 71.8 71.5 



67.6 70.8 71.7 



69.7 68.4 68.8 



67.8 



67.7 

 67.5 

 67.4 

 66.6 

 68.0 



68.1 

 67.5 

 67.6 

 67.0 



Kean 69.6 69.7 66.2 65.6 66.8 64.4 65.4 66.7 67.0 68.8 70.0 70.4 67.6 



Lat. 40° N. Long. 80° 

 950 mb. + 



W. 



1929 66.5 68.6 63.6 62.4 69.9 64.6 68.0 65.9 69.6 67.9 -67.9 67.8 



1930 78.7 68.4 59.2 66.7 65.5 67.1 



1931 63.9 64.9 60.0 66.8 65.6 64.6 



1932 70.4 65.4 57.9 62.9 67.8 63.9 

 1938 65.1 64.7 61.8 65.3 65.6 64.1 

 1984 69.1 67.7 71.3 66.7 66.9 64.0 



1935 69.5 67.0 68.3 60.6 65.6 65.3 



1986 64.7 67.5 64.1 67.3 68.0 68.8 



1937 74.6 63.6 62.0 65.7 65.5 63.5 



1938 67.7 71.4 66.6 68.0 64.0 67.1 



1939 65.6 69.8 67.6 64.3 65.0 66.1 



63.5 

 64.2 

 61.6 

 66.2 

 65.7 



66.3 

 66.7 

 66.1 

 66.1 

 67.6 



67.4 66.7 



62.6 67.2 



65.8 69.4 



67.4 66.9 



66.4 

 66.4 

 67.4 

 63.1 

 69.9 



67.9 

 68.8 

 67.1 

 67.7 



66.3 

 67.7 

 68.1 

 69.5 

 65.4 



71.6 

 73.3 

 70.8 

 66.3 

 70.3 



65.0 

 68.7 

 70.7 

 68.4 

 66.8 



72.3 67.7 62.9 



69.2 67.7 73.7 



68.0 68.4 68.5 



67.7 71.0 67.5 



Mean 68.2 67.2 63.8 65.2 66.3 64.9 66.2 66.8 67.4 68.2 69.4 68.0 



66.9 



66.6 

 66.1 

 66.1 

 65.4 

 67.6 



66.8 

 67.1 

 66.8 

 67.7 



66.7 



