National Weather Service United States Department of Commerce

 

Reduced to Sea Level

 

MONTH HIGHEST PRESSURE DATE LOWEST PRESSURE DATE
January 30.97 in. January 15, 1972 28.93 in. January 25, 1975
February 30.97 in. February 16, 1989 28.95 in. February 9, 1960
March 30.83 in. March 5, 1948 28.89 in. March 11, 1923
April 30.79 in. April 15, 1981 28.94 in. April 3, 1982
May 30.56 in. May 4, 1966 29.10 in. May 27, 1973
June 30.57 in. June 10, 1913 29.30 in. June 1, 1936
July 30.42 in. July 30, 1936 29.45 in. July 9, 1926
August 30.45 in. August 31, 1967 29.53 in. August 30, 1956
September 30.63 in. September 30, 1947 29.33 in. September 25, 1941
October 30.69 in. October 6, 1935 28.98 in. October 26, 2010
November 30.91 in. November 13, 1986 29.04 in. November 28, 1918
December 31.01 in. December 20, 1924 28.99 in. December 15, 1971
December 15, 1987

HIGHEST PRESSURE:  31.01 inches on December 20, 1924.
LOWEST PRESSURE:  
28.89 inches on March 11, 1923.

 

Since 1905.