20 MASS. EXPERIMENT STATION BULLETIN 367 



Summary for the Fifty Years 1889 - 1938, Inclusive 



Barometer (Pressure in Inches) 



[Readings reduced to sea level] 



Maximum, Feb. 1, 1920, 10 a.m 31.0?0 



Minimum, Sept. 21, 1938, 5:0? p.m 28.410 



Mean 30.014 



Total range 2.640 



Greatest annual range, 1938 2.470 



Least annual range, 1933 1.380 



Mean annual range 1.850 



Greatest monthly range, January 1913 2.180 



Least monthly range, August 1894 .440 



Mean monthly range 1.087 



Air Temperature (in Degrees F.) 



Highest, July 4, 1911, 3:30 p.m 104.0 



Lowest, Jan. 5, 1904, 7:30 a.m —26.0 



Mean 47.4 



Total range 130.0 



Greatest annual range, 1918 122.5 



Least annual range, 1937 90.0 



Mean annual range 107.8 



Greatest monthly range, Mar. and Nov. 1938 79.0 



Least monthly range, July 1889 31.0 



Mean monthly range 54.4 



Greatest daily range, Dec. 10, 1902 54.0 



Least daily range, Nov. 20, 1937 1.0 



Humidity 



Mean relative humidity, percent 67.6 



Precipitation (in Inches) 



Greatest annual precipitation, 1938 59.00 



Least annual precipitation, 1908 30.68 



Mean annual precipitation 43.70 



Greatest monthly precipitation, September 1938 14.55 



Least monthly precipitation, October 1924 .01 



Mean monthly precipitation 3.64 



Greatest annual snowfall, 1893 89.00 



Least annual snowfall, 1919 24.50 



Mean annual snowfall 47.78 



Wind (in Miles) 



Greatest annual movement, 1908 63,571 



Least annual movement, 1894 36,257 



Mean annual movement 52,223 



