BOARD OF AGRICULTURE. [P. D.Xo.4. 



Meteorological Observations at the Massachusetts 

 Agricultural Experiment Station. 



[Latitude, 42 ' 23' 48.5" N.; longitude, 72° 31' 10" W. Height of barometer above ground, 

 51 feet; above sea level, 273.5 feet. Height of wind instruments, 72 feet.] 



Annual Summary for 1907. 



Pressure (in Inches). 

 Maximum reduced to freezing, 30.44, 



February 24, 1 a.m. 

 Minimum reduced to freezing, 28.68, April 



9,12 p.m. 

 Maximum reduced to freezing and sea 



level, 30.78, February 24, 1 A.M. 

 Minimum reduced to freezing and sea 



level, 28.99, April 9, 12 p.m. 

 Mean reduced to freezing and sea level, 



30.018. 

 Annual range, 1.79. 



Air Temperature (in Degrees F.)A 

 Highest, 96.0, August 12, 4.00 P.M. 

 Lowest, — 23.5, January 24, 7 a.m. 

 Mean, 45.2. 



Mean of means of max. and min.,"45.4. 

 Mean sensible (wet bulb), 40.S. 

 Annual range, 119.5. 

 Highest mean daily, 78.fi, July 18. 

 Lowest mean daily, —8.0, January 24. 

 Mean maximum, 55.8. 

 Mean minimum, 35.1. 

 Mean daily range, '.'0.7. 

 Greatest daily range, 43.0, May 14. 

 Least daily range, 2.0, June 2. 



Humidity. 



Mean dew point, 36.9. 

 Mean force of vapor, .355. 

 Mean relative humidity, 77.9. 



Wind. — Prevailing Direction, West. 

 Summary {Per Cent). 

 North, northwest, 10. 

 West, lo. 



South, southeast, 10. 

 Northwest, 11. 

 South, a. 



West, northwest, 9. 

 Other directions, 41. 

 Total movement, CO. 016 miles. 

 Greatesl daily movement, 529 miles, 

 February 3. 



Least daily movement, 18 miles, Decem- 

 ber 8. 



Mean daily movement, 164 miles. 



Mean hourly velocity, 6.8 miles. 



Maximum pressure per square foot, 32.5 

 pounds = 81 miles per hour, July 20, 

 8 P.M., W. 



Maximum velocity for 5 minutes, 44 miles 

 per hour, March 24, 3 a.m., X.N.W. 



Precipitation (in Inches). 

 Total precipitation, rain or melted snow, 



42.27. 

 Number of days on which .01 or more rain 



or melted snow fell, 122. 

 Snow total in inches, 54.5. 



Weather. 



Mean cloudiness observed, 49 per cent. 

 Total cloudiness recorded by sun ther- 

 mometer, 2,137 hours = 48 per cent. 

 Number of clear days, 95. 

 Number of fair days, 155. 

 Number of cloudy days, 115. 



Bright Sunshine. 

 Number of hours recorded, 2,317 = 52 per 

 cent. 



Dates of Frosts. 

 Last, May 22. 

 First, September 27. 



Dates of Snow. 

 Last, May 11. 

 First, November 24. 

 Total days of sleighing, 67. 



Gales of 50 or More Miles per Hour. 

 January 9, 53 miles; W.N.W. 

 February 3, 63 miles; N.X.W. 

 March 29, 74 miles; W.N.W. 

 July 20, 81 miles; W. 



December 10, 61 miles; S.S.E.; 31, 50 

 miles; N.W. 



Temperature in ground shelter. 



J. E. OSTRANDER, Meteorologist. 

 T. A. BARRY, Observer. 



