No. 1.] MASSACHUSETTS WEATHER. 



X X X 1 1 1 



Meteorological Observatory of the Hatch Experi- 

 - ment Station (Massachusetts Agricultural Col- 

 lege), Amherst. 



Annual Summary for 1901. 



Pressure (in indies). 



Maximum reduced to freezing, 30.36, Jan- 



uai \ :;, lo a.m., January 20, u a.m. 



Minimum reduced to freezing, 28.69, Jan- 

 uary 28, 1 A.M. 



Maximum reduced to freezing and sea 

 level, 30.69, January 3, 10 a.m., Jan- 

 uary 20, 9 A.M. 



Minimum reduced to freezing and sea 

 level, 29.01, January 28, 1 A.M. 



Mean reduced to freezing and sea level, 

 •29.955. 



Annual range, 1.68. 



Air Temperature (in Degrees /•'.). * 



Highest, 100.5, July •-», 1.30 P.M. 



Lowest, — 10.5, December 7, 7.30 a.m. 



Mean, 46.9. 



Mean of means of max. and min., 4t', S. 



Mean sensible (wet bulb), 43.4. 



Annual range, 11 1.0. 



Highest mean daily, 83.9, July 1. 



Lowest mean daily, 2.5, January 19. 



Mean maximum, 57.1. 



Mean minimum, 36.6. 



Mean daily range, 20.5. 



Greatest daily range, 50.0, April 29. 



Least daily range, 3.5, March 12. 



Humidity. 



Mean dew point, 37.6. 

 Mean force of vapor, .421. 

 Mean relative humidity, 71.0. 



trim/. — Prevailing Direction West. .s'»»(- 



ma/ry ( Per Cent). 

 North-west, 11. 

 North, in. 

 South, 15. 

 West, 12. 



Other directions, 52. 

 Total movement, 50,353 miles. 

 Greatest daily movement, 520 miles, De- 

 cember 15. 



Least daily movement, 3 miles, Decem- 

 ber li). 



Mean daily movement, 138.0 miles. 



Mean hourly velocity, 5.75 miles. 



Maximum pressure, per square foot, 24.0 

 pounds =69 miles per hour, Septem- 

 ber 11, 5 P.M., S. 



Precipitation (in Inches). 



Total precipitation, rain or melted snow, 



4'J.72. 

 Number of days on which .01 or more 



rain or melted snow fell, 135. 

 Snow total, in inches, 52.3. 



Weather. 



Mean cloudiness observed, 60 per cent. 

 Total cloudiness recorded by sun ther- 

 mometer, 2,590 hours = 58 per cent. 

 Number of clear days, 81. 

 Number of fair days, 105. 

 Number of cloudy days, 179. 



Bright Sunshine. 



Number of hours recorded, 1,866 = 42 per 

 cent. 



Dates of Frosts. 



Last, May 6. 



First, September 26. 



Dates of Snmo. 



Last, April 3. 



First, November 11. 



Total days of sleighing, 46. 



dales of 60 or More Miles per Hour. 



April 15, 52 miles, N.K.; Julj 2, 54 miles, 

 W.; September 11, tin miles, s.; No- 

 vember 24, 5ii miles, K. ; December 14, 

 50 miles, S.W.; December 15, 54 miles, 

 8.W.; December 31, 51 miles, N.W. 



• Temperature in ground shelter. 



