Annual Summary for 1921. 



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 semi-daily reduced to freezing and sea-level, 



Annual range, 



30.56, Jan. 19th, 10 A. 



29.03, Oct. 20th, 3 p. 



30.90, Jan. 19th, 10 A. 

 29.33, Oct. 20th, 3 p. 



30.040 



1-57 



*Air Teiuperatiire. In degrees Fahr. 



Highest, 96.0, June 22d, 3:00 p. 



Lowest, — 6.0, Jan. igth, 7 a. 



Mean hourly, 49.5 



Mean of means of max. and min., 49.S 



Mean sensible (wet bulb) , 44.4 



Annual range, 102.0 



Highest mean daily 80.6, July 8 



Lowest mean daily, 4.0, Jan. 19 



Mean maximum, 60.5 



Mean minimum, 39.0 



Mean daily range, 21.5 



Greatest daily range, 48.5, Oct. i? 



Least daily range, 3.0, Nov. iQth. 



Humidity. 



Mean dew point, 40.4 



Mean force of vapor, 405 



Mean relative humidity, 76.0 



Wind. 



Prevailing direction, West Southwest 



Summary. 



South Southwest 22 per cent 



North 10 " 



Northwest 10 " " 



Other directions, 58 " " 



Total movement 52.373 m 



Greatest daily movement, .... 465 ni., Jan. 25 



Least daily movement, 13 m., July 4 



Mean daily movement, 143 m 



Mean hourly velocity, 6.0 m 



Maximum pressure per square foot, 29.0 lbs., = 



76 m. per hour, Dec. i8th, 5:0 A., W.S.W. 

 Maximum velocity for 5 minutes, 36 rn. per 



hour, Nov. 5th, 7 A. N.W.; Dec. iSthi 7 A. 



W.S.W. 



Precipitation. In inches. 

 Total precipitation, ram or melted snow, . 42.22 



Snow total in inches, 37.5 



Number of days on which .01 or more rain 

 or melted snow fell, 131 



Weather. 



Mean cloudiness observed, 50 per cent. 



Total cloudiness recorded by Sun Thermom- 

 eter, 1819 hrs.=40 per cent. 



Number of clear days, 126 



Number of fair days, 141 



Number of cloudy days 98 



Bright .Sunshine- 

 Number of hours recorded, 2695 lus.=6o per cent. 



Waes of Frosts. 



Last, 

 First, 



May 12th 

 . ODt. gth 



Dates of Snow. 



Last, April iSth 



First, Nov. 7th 



Total days of sleighing, 28 



Gales of 50 or More Miles Per Hour, 



Mar. 29th, 50m., N.; Nov, 5th, 6in>., N.W.; 

 Dec. 3d, 54m., W.N.W.; i8th, 76m., W.S. W. 



Temperature in ground shelter. 



G. E. LINDSKOG, 

 Observer. 



J. E. OSTRANDER, 



Meteorologist. 



