No. 4.] MASSxVCHUSETTS WEATHER. xxxiii 



Meteorological Observatory of the Hatch Experi- 

 ment Statio^^t (Massachusetts Agricultural Col- 

 lege), Amherst. 



Annual Summary for 1902. 



Pressure (in Inches). 



Maximum reduced to freezing, 30.42, De- 

 cemljer 1,7, 10 A.M. 



Minimum rediiced to freezing, 28.54, Feb- 

 ruary 17, 11 P.M. 



Maximum reduced to freezing and sea 

 level, 30.75, December 15, 10 a.m. 



Minimum reduced to freezing and sea 

 level, 2S.S6, February 2, 6 p.m., Feb- 

 ruary 17, 11 P.M. 



Mean reduced to freezing and sea level, 

 29.954. 



Annual range, 1.S9. 



Air Temperature (in Degrees F.).* 

 Highest, 91.0, May 23, 4 p.m. 

 Lowest, — 15.0, December 10, 1 a.m. 

 .Mean, 47.3. 



Mean of means of max. and min., 47.2. 

 Mean sensible (wot bulb), 43.1. 

 Annual range, 10(5.0. 

 Highest mean daily, 79.0, July 9. 

 Lowest mean daily, —6.0, December 9. 

 Mean maximum, .57.6. 

 Mean minimum, 36.9. 

 Mean daily range, 20.7. 

 Greatest daily range, 54.0, December 10. 

 Least daily range, 3.0, November 27. 



niunidity. 



Mean dew point, 37.7. 

 Mean force of vapor, .402. 

 Mean relative humidity, 71.6. 



Wind. — Prevailing Direction North-west. 



Summary (Per Cent). 

 West, 12. 



East, north-east, 10. 

 West, south-west, 10. 

 North, 9. 

 North-west, 9. 

 Other directions, 50. 

 Total movement, 48,438 miles. 



Greatest daily movement, 596 miles, March 

 19. 



Least daily movement, 3 miles, Decem- 

 ber 7. 



Mean daily movement, 132.7 miles. 



Mean hourly velocity, 5.53 miles* 



Maximum pressure, per square foot, 24.0 

 pounds = 69 miles per hour, February 

 3, 4 P.M., N.N.W.; March 19, 3 p.m., 

 'E.N.E. 



Precix>itation (in Inches). 

 Total precipitation, rain or melted snow, 



46.99. 

 Number of days on which .01 or more 



rain or melted snow fell, 144. 

 Snow total, in inches, .57.0. 



Weather. 

 Mean cloudiness observed, 60 per cent. 

 Total cloudiness recorded by sun ther- 

 mometer, 2,589 hours = 58 per cent. 

 Number of clear daj'S, 73. 

 Number of fair days, 113. 

 Number of cloudy days, 179. 



Bright Sunshine. 

 Number of hours recorded, 1,864 = 42 per 

 cent. 



Dates of Frosts. 



Last, May 14. 

 First, September 6. 



Dates of Snow. * 

 Last, April 2. 

 First, October 29. 

 Total days of sleighing, 44. 



Gales of SO or More Miles x>er Hour. 

 February 2, 60 miles, N.N.W. ; February 

 3, 69 miles, N.N.W. ; March 19, 69 miles, 

 E.N.E. ; April 27, 53 miles, N.W. ; -June 

 3, 50miles, E.N.E.; June 26,55 miles, 

 N.; December 8, 50 miles, AV.S.W. 



* Temperature in ground shelter. 



.J. E. Ostrander, Meteorologist. 

 S. G. Bacon, Observer. 



