METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude. 42° 23' 48.5" N. Longitude, 72° 31' 10" W. 



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



BULLETIN No. 97. 



JANUARY, 1897. 



MONTHLY SUMMARY. 



Fi'ettsiive. In inches. 

 Ma.viniiini reiluced to freezing, 30. 45, 1st, 10 a. 

 Minimum reduced to freezing, iS.Sfi, '28th,'2 i'. 

 Reducedf maximum reading, 30.77. lst,lo a. 

 Reducedf min. reading, . . . 29.20, 28ll),2 p. 



Mean reducedf, 30.041 



Monthly range \.fu 



*Air Temperature. In Degrees Fahr. 



Highest .51.0; 5th 



Lowest 0., 19th, 20th 



Mean, 24.2 



Mean of means of max. and min., . . . .24.7 



Mean senslble( wet bulb) 23.0 



Monthly Range, .51. 



Highest mean daily 42.1, .">th 



Lowest mean dailj', 5.0, 19ili 



Mean maximum, 3-'.*> 



Mean minimum, 16.6 



Mean daily range 16.2 



Greatest daily range, .52.0, 20th 



Least daily range, 6.0, 24th 



Htimidity. 



Mean dew point, . . . . ; \$S] 



Mean force of vapor, 147 



Mean relative humidity 77.1 



Wind. 

 Prevailing Direction, we.st. 



Summary. ! 



North West 29 per cent. 



West 23 " " 



South West 10 " " ! 



South 10 " "I 



Other direction.^, 28 " " I 



Total movement, 5501 m. 



Greatest dally movement, . . . 400 m., 26th 



Least daily movement, 32ni., 14th 



Mean daily movement 177.5 m. 



Mean hourly velocity, 7.4 m. 



Maximum pressure per square footilS.S lbs.= 

 01 m. per hour, 18th 3-30 P. W. 



I'recipitation. In inches. 



Total precipitation 3. 00 



jNumlierof days on which .01 inch or more 

 rain or melted snow fell, 9 



jSnow total in inches 21. 



I Weather. 



I Mean cloudiness observed, ... 46 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . .151 hours or 51 per cent. 



Number of clear days, 7 



Number of fair days, 11 



Number of cloudy days, 13 



Bright Sminhine. 



Number of Hours recorded, 144 hours or 49«1 



Rain, 4th, 5th, 17th, 18th, 21st. 



dales, of 35 or more miles per hour, 39m., 

 6th, W. ; 35m., 9th, S. ; 35m.,17th,S. ; 61m., 

 18th,W.;.S9m., 19th, N.W.; 41m., 22d,W.; 

 or>m., 23d, W.N.W.; 3Sm., 24th, W.N.W.; 

 .52m., 25th, W.N.W.; .55m., 26th, N.N.W.; 

 40m., 28th, N. 



Snow, . 6th, 10th, 11th, 16th, 17th, lSth,21st, 

 22d, 27th, 28th. 



Days of sleighitifi , 10 



• Temperature in grounil shelter. 



t Reduced to freezing and .sea level. 



* * Determined from levels of B. .S: M. K. R. 



