No. 4. J MASSAC 11 US KITS WKATIlKli. 



XXVI 1 



MKTP^OROLOGirAF, OllSKItVATORV OF TIIK TlATfH KxPFJil- 



MENT Station (MAssACiiutsETTs Agricultural Col- 

 lege), Amherst. 



Annual Summary for 1903. 



Pressure (in fiiches). 



Maxiimini rerluct'd to freeziii};, 30.3f<, No- 

 voiibcr 21, 10 A.M. 



Mininuiin reducod to frcczinfr, -ISAW, Feb- 

 ruary 17, 3 A.M. 



!Maxiimun reduced to freezing and sea 

 level, 30.70, November 21, 10 A.M. 



Minimum reduced to freezing and sea 

 level, 2S.113, February 17, 3 A.M. 



Mean reduced to freezing and eca level, 

 2i).'.titfi. 



Annual range, 1.77. 



Air Tempvrdtnrc {in Degrees F.).* 

 Highest, '.17.0, July 'J, 4 P.M. 

 Lowest, — 12.0, January 20, 9 A.M. 

 Mean, 46.7. 



Mean of means of max. and niin., 47.0. 

 Mean sensilile (wet bulb), 43.0. 

 Annual range, lOD.O. 

 Iligliest mean daily, 79.6, July 9. 

 Lowest mean daily, — 3.0, January 19. 

 Mean maximum, 57.8. 

 ]Mean minimum, 36.1. 

 Mean daily range, 21.7. 

 Greatest daily range, 4.i.0, FeVtruary 21, 



March 14, May 12. 

 Least daily range, 3. .5, June 15, October 11. 



Humidity. 



Mean dew iioint, 37.6. 

 Mean force of vajior, .403. 

 Mean relative humidity, 73.5. 



Wind. — Prevailing Direction West, South- 

 west. 

 Summary {Per Cent). 

 West, 14. 



North, north-west, 10. 

 South, south-west, 12. 

 West, north-west, 9. 

 South, 9. 

 Other directions, 46. 



Total movement, 46,256 miles. 



(ireatest daily movement, 402 miles, Ai)ril 



17. 

 Least daily movement, 4 miles, August 27. 

 Mean daily movement, 126.7 miles. 

 Mean hourly velocity, 5.28 miles. 

 Maximum pressure, per sijuare foot, 22.0 



pounds = 66 miles per hour, February 



12, 12 M., W. 



Precipitation {in Inches). 

 Total precipitation, rain or melted snow, 



45.45. 

 Number of days on which .01 or more 



rain or melted snow fell, 116. 

 Snow total, in inches, 33.5. 



Weather. 

 Mean cloudiness observed, .53 per cent. 

 Total cloudiness recorded by sun ther- 

 mometer, 2,328 hours =52 per cent. 

 Number of clear days, 119. 

 Number of fair days, 98. 

 Number of cloudy days, 148. 



Bright Sunshine. 

 Number of hours recorded, 2,126 = 48 per 



cent. 

 ' Dates of Frosts. 



Last, May 2. 



First, September 25. 



Dates of Snoto. 



Last, April 4. 



First, October 26. 



Total days of sleighing, .52. 



Gales of 50 or More Miles per Hour. 

 January 31, 50 miles, "W.; February 9, 56 

 miles, S.AV. ; February 12, 66 miles, 

 W.; February 28, 58 miles, S.S.W.; 

 April 18, 50 miles, W.S. W. ; July 29, .56 

 miles, S.W.; December 13, 58 miles, 

 W.; December 22, 51 miles, W.N.W. 



* Temperature in ground shelter. 



J. E. (JsTKANUKK, Meteorologist. 

 F. F. Henshaw, Observer. 



