Annual Summary for 1915. 



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, 



30.26, Feb. 19th, 8 A. 



28.55. Dec. 26th, 9 A. 



30.58, Feb. 19th, 8 A. 



. 28.85, Dec. 26th, 9 A. 



29.992 



1-73 



*Air Temperature. In degrees Fahr. 

 Highest, .... 93.0, Sept. gth, 4P.; 15th, 1:30 p. 



Lowest, —4-0, Jan. 5th, 8 A. 



Mean hourly, 47-6 



Mean of means of max. and min., 48.4 



Mean sensible (v^fet bulb) , 43-3 



Annual range, 97-0 



Highest mean daily, 79-4. Sept. 15 



Lowest mean daily, 7-8, Jan. 30 



Mean maximum, 58.6 



Mean minimum, 38.3 



Mean daily range, 20.3 



Greatest daily range, 43-5. May 31 



Least daily range, 3.0, May 17 



Humidity. 



Mean dew point, 38.8 



Mean force of vapor, 381 



Mean relative humidity, 75.6 



Wind. 



Prevailing direction, West Northwest 



Summary. 



Northewst, 14 per cent. 



South Southwest 11 " " 



West, 10 " " 



South 10 " " 



West Northwest 10 " " 



North Northwest 10 " " 



Other directions, 33 " " 



Total movement, 50.486 m 



Greatest daily movement, .... 555 m., Mar. 3 



Least daily movement, i m., Jan. 4 



Mean daily movement, 141 m 



Mean hourly velocity, 5-9 m 



*Temperature in ground shelter. 



Ma.ximum pressure per square foot, 22.0 lbs. =66 

 m. per hour, Nov. 15, 8?., W.N.W. 



Maximum velocity for 5 minutes, 48 m. per 

 hour, July 5th, 10 A., S..S.E.; Sept. 26th, yp , 

 W.; Nov. 15th, 9P.,W.N.W., Dec.26th,2A.,S. 



Precipitation. In inches. 

 Total precipitation, rain or melted snow, . 5i-58 

 Number of days on which .01 or more rain 



or melted snow fell, 122 



Snow total in inches, 40.8 



Weather. 



Mean cloudiness observed, 43 per cent. 



Total cloudiness recorded by Sun Thermom- 

 eter, 2230 hrs.=5o per cent. 



Number of clear days, 82 



Number of fair days, . . 156 



Number of cloudy days, 127 



Bright Sunshine- 

 Number of hours recorded, 2224 hrs.=5o per cent. 



Dates of Frosts. 



Last, May 20th 



First, Sept. 23d 



Dates of Snow. 



Last April 3d 



First, Nov. 17th 



Total days of sleighing, 50 



Gales of 50 or More Miles Per Hour. 



Jan. 13th, 50m., N.; Mar 26th, 57m., W.: April 

 3d, 50m, N.; June 19th, 62m., S.S.W.; July 

 5th 57m., S S.E.: Sept. 26th, 54m, W.; Nov. 

 2d, 56 m, W.N.W.; 13th, 56m,W.N.W.; 15th. 

 66m W.N.W.; i6th 51m, W.N.W.; Dec. 

 25th, 51m. S. 



DAVID POTTER, 



Observer. 



J. E. OSTRANDER, 



Aleteorolasisi. 



