METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Lati tilde, 42° 23' 48.5" N. Lougitude, 72° 31' 10" W. 



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



BULLETIN No- 100. 



APRIL, 1897. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.30, 13th, 7A. 

 Minimum reduced to freezing, 29.-2-i, 2t)th, 5 P. 

 Ileducedt maximum reading, 30.61, 13th, 7 a. 

 lleducedt min. reading, . . . 29.51, 26th,. 5 P. 



Mean reducedf, 30.042 



Monthly range, 1.10 



*Air Temperature. In Degrees Fahr. 



Highest 80.5; 25th 



Lowest, 20.5, 20th 



Mean, 46.5 



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



Mean sensible(wet bulb) 42.2 



Monthly llange, 60.0 



Highest mean ilaily 62.7, 25th 



Lowest mean daily 30.5, 20th 



Mean maximum, 59.4 



Mean minimum, 34.7 



Mean daily range, . 24.7 



Greatest daily range, 43.5, 29th 



Least daily range, 4.5, 9th 



Hutnldity. 



Mean dew point, 35.7 



Mean force of vajior, 3.56 



Mean relative humidity 6S.2 



Wind. 



Prevailing Direction, West. 



Summary. 



South West, 10 per cent. 



We.st. 10 " 



West South West, 10 " " 



North in " " 



North North West, 13 " " 



Soutli 17 " " 



Other directions 30 " " 



Total movement 5523 m. 



Greatest daily movement, . . . 380 ni., 19th 



Least daily movement, 57m., 8th 



Mean daily movement 184.1 m. 



Mean hourly velocity, 7.7 m. 



Maximum pressure per square f oot,14.0 lbs.= 



53 m. per hour, 6-30 P. M. 19th, N.W. 

 Precipitation. In inches. 



Total precipitation 2.42 



Number of days on which .01 inch or more 



rain or melted snow fell, 10 



Snow total in inches, T. 



IVenther. 



Mean cloudiness observed, . . . 40 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, ... 164 hours or 49 per cent. 



Number of clear days 13 



Numberof fair days, 5 



Number of cloudy days 12 



Bright Sunshine. 



Number of Hours recorded, 239 hours or 595t 



Rain, 4th, .5th,6th,7th, 8th, 9th, 10th, 14th, 1.5th, 

 17th, 19th, 26th, 28th. 



Gtilrs, of 35 or more miles per hour, 43m., 

 13th,S.S.W. ; 45m., 17th, N.W.; 53m., 19th, 

 N.W.; 35m., 20th, N.W.; 3Sm.. 2.5th, 

 S.W.;47m.,2Gth,S.S.W.; 40m., 27th, N.W. 



Snotv, -7th. 



• Temperature in ground shelter. 



t Reduced to freezingand sea level. 



* * Determined from levels of B. & M. K. K . 



