SEA LEVEL ATMOSPHERIC PftESevfC 

 (MONTHLY MEAN) 



JANUARY 1964 



FROM U.8.W.B. CHARTS 



Figure 56. — Mean sea level pressure, January 1964. 



SEA LEVEL ATMOSPHERIC PRESSURE 

 (MONTHLY MEAN) 



FEBRUARY 1964 



FROM U.S.W.B. CHARTS 



Figure 57. Mean sea level i)ressure, February 1964. 



64 



