Annual Summary for 1911. 



Pressure. In inches. 



Maximum reduced to freezing, 



Minimum reduced to freezing, 



Maximum reduced to freezing and sea-level, . . 

 Minimum reduced to freezing and sea-level, . . 



Mean reduced to freezing and sea-level, 



Annual range, 



*Air Temperature. In degrees Falir. 



Highest, i04-0i July 4th, 3:30 p. 



Lowest —3-0, Feb. i6th, 7:30 P- 



Mean hourly, 47-6 



Mean of means of max. and min 48.0 



Mean sensible (wet bulb) , 42.7 



Annual range, io7-o 



Highest mean daily, 87.0, July 4 



Lowest mean daily, 5-8, Feb. 6 



Mean maximum, 58-6 



Mean minimum, 37-3 



Mean daily range 21.3 



Greatest daily range, 44.0, Feb.i6, Mar.26, Apr.29 

 Least daily range, 2.5, Dec. 15 



Humidity. 



Mean dew point, 38-3 



Mean force of vapor, 387 



Mean relative humidity, 75-2 



Wind. 



Prevailing direction, West 



Summary. 



West, 13 per cent. 



South, 12 '' I' 



Northwest 12 " 



North 10 " '' 



Other directions, 53 " 



Total movement, 58.242 m 



Greatest daily movement, .... 605 m., Mar. 16 



Least daily movement i4 m., Feb. 9 



Mean daily movement, 160 m 



Mean hourly velocity, 6.7 m 



*Temperature in ground shelter. 



R. N. HALLOWELL, 



Observer. 



. 30.41, Apr. i3th,9 A. 



28.64. Mar. 30th, 6 a. 



. 30.72, Mar. 7th, 10 A. 



. 28.95, Mar. 30th, 6 A. 



30.060 



1-77 



Maximum pressure per square foot, 30.5 lbs. =79 

 m. per hour, Dec. 28th, 10:30 A., N.N.W. 



Maximum velocity for 5 minutes, 50 m. per 

 hour, Jan. 30th, 5 P., W. 



Precipitation. In inches. 



Total precipitation, rain or melted snow, . 44.21 

 Number of days on which .01 or more rain 



or melted snow fell, 120 



Snow total in inches, 35.0 



Weather. 



Mean cloudiness observed, 55 per cent. 



Total cloudiness recorded by Sun Thermom- 

 eter, 2023 hrs.=45 per cent. 



Number of clear days, 106 



Number of fair days, 131 



Number of cloudy days, 12S 



Bright Sunshine- 

 Number of hours recorded,243i hrs.:=55 per cent 



Dates of Frosts. 



Last May 5th 



First Sept. 14th 



I>ates of Snow. 



Last April 19th 



First Nov. 14th 



Total days of sleighing, 23 



Gal 8 of 50 or More Miles Per Hour. 



Jan. 30th, 62m., N.; March i6th. 65m., N.N.W. ; 

 Nov. i2th, 55 m., S.W.; Dec. 2Sth, 79 m., 

 W.N.W. 



J. E. OSTRANDER, 



Meteorologist. 



