No. 4.] MASSACHUSETTS WEATHER. 



XXIX 



Meteorological Observatory of the Hatch Experi- 

 ment Station (Massachusetts Agricultural Col- 

 lege), Amherst. 



[Latitude, 42° 23' 48.5" N. ; longitude, 72' 31' 10 " W. Ileiglit of Ijaroiueter aljove ground, 

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



Annual Summary for 1904. 



Pressure {in Inches). 



Maximum reduced to freezing, 30.&3, 

 March 5, 10 A.M. 



Minimum reduced to freezing, 28.42, No- 

 vember 13, 10 P.M. 



Maximum reduced to freezing and sea 

 level, 30.96, March 5, 10 a.m. 



Minimum reduced to freezing and sea 

 level, 28.73, November 13, 10 p.m. 



Mean reduced to freezing and sea level, 

 30.034. 



Annual range, 2.23. 



Air Temjierature (in Degrees F.).* 

 Highest, 94.5, July 19, 3 P.M. 

 Lowest, — 26.0, January 5, 7.30 A.M. 

 Mean, 43.9. 



Mean of means of max. and min., 44.0. 

 Mean sensible (wet bulb), 39.5. 

 Annual range, 120.5. 

 Highest mean daily, 79.5, June 20. 

 Lowest mean dail}', — 12.7, January 5. 

 Mean maximum, .54.9. 

 Mean minimum, 33.1. 

 Mean daily rauge, 21.8. 

 Greatest daily range, 49.0, October 17. 

 Least daily range, 3.5, March 22. 



Humidity. 



Mean dew point, 35.5. 

 Mean force of vapor, .354. 

 Mean relative humidity, 77.0. 



Wind. — Prernilinrf Direction, West. 

 Summari/ (Per Cent). 

 South, 20. 

 North-west, 12. 

 North, north-west, 12. 

 North, 10. 

 West, 10. 

 Other directions, 36. 



Total movement, 46,994 miles. 



Greatest daily movement, 450 miles, No- 



vemlter 14. 

 Least daily movement, miles, January 6. 

 Mean daily movement, 128 miles. 

 Mean hourly velocity, 5.3 miles. 

 Maximum pressure, per square foot, 23.5 



pounds = 69 miles per hour, February 



8, 2 A.M., W.N.W., October 21, 12 M., 



S.S.E. 



Precipitation (in Inches) . 

 Total precipitation, rain or melted snow, 



45.30. 

 Number of days on which .01 or more 



rain or melted snow fell, 126. 

 Snow total, in inches, 59^. 



Weather. 

 Mean cloudiness observed, 51 per cent. 

 Totiil cloudiness recorded by sun ther- 

 mometer, 2,053 hours = 46 per cent. 

 Numljer of clear days, 142. 

 Number of fair days, 96. 

 Number of cloudy days, 128. 



Bright Sunshine. 



Number of hours recorded, 2,401 = 54 per 



cent. 



Dates of Frosts. 



Last, April 23. 

 First, September 22. 



Dates of Snow. 

 Last, April 20. 

 First, 0<-tober 12. 

 Total days of sleighing, 85. 



Gales of SO or More Miles per Ilour. 

 February 8, 69 miles, W.N.W.; IMan-h 3, 

 54 miles, N.W. ; April 2, 56 miles, 

 N.E.; September 30, .54 miles, W.N. W.; 

 October 21, 69 miles, S.S.E. 



* Temperature in ground shelter. 



J. E. OSTRANDEK, Meteorologist. 

 G. W. Patch, Observer. 



