Annual Summary for 1917. 



Pressure. In inches. 



Maximum reduced to freezing, . . 30.53, Dec. 17th, 10 a. 



Minimum reduced to freezing • . 28.61. Feb. 5th, 11 a. 



Maximum reduced to freezing and sea-level, 30.S6, Dec. 17th, lOA. 



Minimum reduced to freezing and sea-level, 2S.Q3, Feb. 5th, 11 A. 



Mean reduced to freezing and sea-level, 30.010 



Annual range, 1.93 



*Air Temperature. In degrees Fahr. 



Highest, gS.S.July 31st, 5 p. 



Lowest —22.5, Dec. 30th, 7:30 a. 



Mean hourly, 44-4 



Mean of means of max. and min., 44.S 



Mean sensible (wet bulb), 40.2 



Annual range, 121.0 



Highest mean daily S6.4, July 31 



Lowest mean daily, —12.7, Dec. 30 



Mean maximum, 55.2 



Mean minimum, 34-6 



Mean daily range, 20.6 



Greatest daily range 43-°. Mar. 7 



Least daily range, 3-o- Jan. 5 



Humidity. 



Mean dew point, 36.4 



Mean force of vapor, 352 



Mean relative humidity, 78.1 



Wiatl. 



Prevailing direction, West. 



Summary. 



Total movement, 44.653 m 



Greatest daily movement 6iim., April 11 



Least daily movement, . i m., Sept. 26; Nov. 30 



Mean daily movement 122 m 



Mean hourly velocity, 5.1 m 



Maximum pressure per square foot, 35.0 lbs.=84 



m. per hour, April 10, 3 p., N.W. 

 Maximum velocity for 5 minutes, 40 m. per 



hour, Apr. 10th, 3 P., N.W. 



North Nortliwest, 10 per cent 



West Northwest 10 " 



West 10 " 



Northwest 10 " " 



Other directions, 59 " 



Precipitation. In inches. 

 Total precipitation, rain or melted snow, . 43.56 

 Number of days on which .01 or more rain 



or melted snow fell, 117 



Snow total in inches, .... 58.0 



Weather. 



Mean cloudiness observed 48 per cent. 



Total cloudiness recorded by Sun Thermom- 

 eter, 1770 hrs. =40 per cent. 



Number of clear days, 129 



Number of fair days, 137 



Number of cloudy days, 99 



Bright Siinshiiie- 



Number of hours recorded, 2684 hrs.^ 



=60 per cent- 



Dates of Frosts. 



Last May iSth 



First Sept. nth 



Dates of Snow. 



Last, April 27th 



First Nov. 24th 



Total days of sleighing 95 



Gales of 50 or More Miles Per Hour. 



Jan. 14th, 57m., S.S.W.; Feb. 5th. 5im., S.W.; 

 Feb. loth, S2m, N.W.; April loih, 84m., 

 N.W.; Oct. 24th, 51m., S.: 30th, L58ni, S.W. 



* I'emperature in ground shelter. 



A. L. CH.\NDLER, 



O/'senrr. 



J. E. OSTRANDER, 



Meteorolos'ist. 



