METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



LaLitiide, 42° 23' 48.5" N. Longitude, 72° 31' 10" VV. 



Height of instruments above ground, 51ft. Above sea level, 273.5 ft. ** 



BULLETIN No. 101. 



MAY, 1897. 



MONTHLY SUMIVIARY. 



Pvessure. In inches. 

 M:ixinuun reduced to freezing, 30.05, Stti,10A. 

 Minimum reduced to freezing, iO.S'i, 10th, 4 P. 

 Reducedt maximum reading, 30.36, 8th, 10 a. 

 Reiluccdt min. reading, . . . 29.60, 10th, 4 P. 



Mean reducedf, 29.924 



Montlily range, 0.76 



*Air Temperature. In Degrees Fahr. 



Higliest 79.5; 10th 



Lowest 31.5, Sth 



Mean, 57.1 t t 



Mean of means of max. and min., .... 56.7 



Mean sensible(wet bulb), 52.4 



Monthly Range 48.0 



Highest mean daily 



Lowest mean daily, 46.9, 2d 



Mean maximum 67.6 



Mean minimum 45.9 



Mean daily range, 21.7^ 



Greatest daily range, 40.0, 9th 



Least daily range, 7.5, 2di 



Humidity. \ 



Mean dew point, 48.0 



Mean force of vapor, 496 



Mean relative humidity, 71.5 



Wind. 



Prevailing Direction, West. 



Summary. 



North West 10 per cent. 



West. 10 " " 



North 10 " " 



North North West, 16 " " 



South 26 " " 



Other directions 28 " " 



Total movement, 5603 ni. 



Greatest daily movement, . . . 307 ni., 20th. 



Least daily movement, 8Im. ,28th. 



Mean daily movement, 180.7 m. 



Mean hourly velocity 7.5 m. 



Maximum pressure per square foot,22.0 lbs.= 



66 m. per hour, 2 P. M. 10th, W.S.W. 

 Precipitation. In inches. 



Total precipitation 4.38 



Number of days on which .01 inch or more 



rain or melted snow fell, 14 



Weather. 



Mean cloudiness observed, ... 47 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 217.5 hours or 48 per cent. 



Number of clear days, . 11 



Numberof fair days, II 



Number of cloudy days, 9 



Bright Sunshine. 



Number of Hours recorded, 236 hours or 525( 



KaJH,lst, 2<l,3d,4th, 10th, 12th, 13th, l.-ith, 

 21st, 24th, 25th, 27th, 28th, 31st. 



Last Frost 8tli. 



Gales, of 35 or more miles per hour, 35m., 

 6th, N.N.E.;36m., 7th, N. ; 66m., 10th, 

 W.S.W. ; .39m., I3th, S.S.W.; 40m., 20th, 

 S.S.W.; 42m., 23d, S.S.W. ; 40m., 26th, N. 

 36m., 30th, S. 



Til under and Ziightning, 10th. 



• Temperature in ground shelter. 



t Reduced to freezing and sea level. 



* * Determined from levels of P.. & M. 11. R. 



t t Mean of tri-daily readings. Draper Thermometer record broken for several days. 



