xl 



BOARD OF AGRICULTURE. [Pub. Doc. 



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.] 



Bulletin No. 240. December, 1908. 

 Annual Hummary for 1908. 

 Pressure {in Inches). 

 Maximum reduced to freezing, 30.49, 



February 9, 8 a.m. 

 Minimum reduced to freezing, 28.56, Jan- 

 uary 8, 1 A.M. 

 Maximum reduced to freezing and sea- 

 level, 30.83, February 9, 8 a.m. 

 Minimum reduced to freezing and sea- 

 level, 28.86, January 8, 1 A.M. 

 Mean reduced to freezing and sea-level, 



30.044. 

 Annual range, 1.97. 



Air Temperature (in Degrees J^.)i 

 Highest, 9G.0, July 12, 1.30 p.m. 

 Lowest — 12.0, February 5, 7 a.m. 

 Mean, 47.6. 



Mean of means of max. and min., 48.0. 

 Mean sensible (wet bulb), 42.6. 

 Annual range, 108.0. 

 Highest mean daily, 80.0, July 7. 

 Lowest mean daily, 0.3, February 5. 

 Mean maximum, 59.1. 

 Mean minimum, 36.9. 

 Mean daily range, 22.1. 

 Greatest daily range, 49.0, October 17. 

 Least daily range, 4.0, November 11. 



Humidity. 

 Mean dew point, 38.5. 

 Mean force of vapor, 387. 

 Mean relative himiidity, 75.8. 



Wind. — Prevailing Direction, West, 

 Southwest. Summary (Per Cent.). 

 South, southwest, 9. 

 West, 11. 



South, southeast, 9. 

 Southwest, 9. 

 South, 11. 



West, northwest, 11. 

 Other directions, 40. 

 Total movement, 63.571 miles. 

 Greatest daily movement, 594 miles, Feb- 

 ruary 2. 



Least daily movement, 10 miles, October 



16. 

 Mean daily movement, 174 miles. 

 Mean hourly velocity, 7.2 miles. 

 Maximum pressure per square foot, 30.0 



pounds = 80 miles per hour, April 11, 



6 P.M., N.N.W. 

 Maximum velocity for 5 minutes, 48 miles 



per hour, July 18, 12 M., S.S.W. 



Precipitation (in Inches) . 

 Total precipitation, rain or melted snow, 



30.68. 

 Number of days on which .01 or more rain 



or melted snow fell, 109. 

 Snow total in inches, 38.5. 



Weather. 

 Mean cloudiness observed, 41 per cent. 

 Total cloudiness recorded by sun ther- 

 mometer, 1,711 hours = 39 per cent. 

 Number of clear days, 143. 

 Number of fair days, 130. 

 Number of cloudy days, 93. 



Bright Sunshine. 

 Number of hours recorded, 2,743 hours = 

 61 per cent. 



Dates of Frosts. 

 Last, June 3. 

 First, September 16. 



Dates of Snow. 

 Last, April 20. 

 First, November 3. 

 Total days of sleighing, 41. 



Gales of SO or More Miles per Hour. 

 January 22, 53 miles; W.N.W.; 27, 56 



miles; S.W. 

 February 2, 68 miles; N.W.; 7, 51 miles; 



N.N.W. 

 April 9, 67 miles; W.N.W.; 11, 80 miles; 



N.N.W.; 12, .^^ miles; N.N.W. 

 May 2, 51 miles; S. 



1 Temperatui-e in ground shelter. 



J. E. OSTRANDER, Meteorologist. 

 R. C. LINDBLAD, Observer. 



