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METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE 



.a.i^h:eir,st. 



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



Height of barometer above ground^ 5^ ft- Above sea level, ^yj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 205. 



JANUARY, 1906. 



MONTHLY SUMMARY. 



I'ressure, In inches. 



Maximum reduced to freezing, 30.46,25th, 9 A. 

 Minimum reduced to freezing, 28.94, 4th, 12 m. 

 Keducedt maximum reading, 30.7S, 25th, 9 A. 

 Reduced! minimum reading, 29.25, 4th, 12 m 



Mean semi-daily reduced, 30.094 



Monthly range 1.53 



*Air Temperature. In Degrees Fahr. 



Highest 60.0, 2ist, 4 p. 



Lowest 3-5. loth, 7:30 A. 



Mean hourly, 29.6 



Mean of means of max. and min 30.2 



Mean sensible (wet bulb), 26.2 



Monthly range, 56.5 



Highest mean daily 52.6,23d 



Lowest mean daily, 11.5, loth 



Mean maximum 38.1 



Mean minimum, 22.3 



Mean daily range 15. S 



Greatest daily range, 32.0,30th 



Least daily range, 6.5, 14th 



Hniniditi/. 



Mean dew point, 20.8 



Mean force of vapor, . . 168 



Mean relative humidity, 74. 8 



Precipitation. In inclies. 



Total precipitation, 2.18 



Number of days on which .01 inch or more 



rain or melted snow fell, 10 



Total snow in inches, 5 



Snow on ground at end of month, . . . none 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5706 m. 



Greatest daily movement, .... 433 m., 17th 



Least daily movement, 2 m., nth 



Mean daily movement 1S4 m. 



Mean hourly velocity, 7.7 m. 



Maximum pressure per square foot, 8.0 Ibs.= 

 45 m. per hour, 28th, 10 P., N. 



Maximum velocity for 5 minutes, 30 m. per 

 hour 7th, 3 P., W.N.W. 



Prevailing Direction, West, Northwest. 



Summary. 



West, Northwest, 19 percent. 



North 13 " " 



North, Northwest, 13 " " 



South, 10 " " 



Southwest 10 " " 



South, Southeast, 10 " " 



Other directions, 25 " " 



WentJier. 



Mean cloudiness observed, .... 51 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . - . 168 hrs. = 57 per cent. 



Number of clear days, 6 



Number of fair days, 10 



Number of cloudy days, 15 



Bright Sunshine. 



Number of hours recorded, . . 126 hrs. =43* 



Rain, 3d, 4th, 12th. 15th, i6th, 20th, 23d, 24th. 



Hales, 35 miles ormore per hour, 39m. 6th, 



W.N.W. ; 36m. 7th, W.; 35m., 17th, W. : 



35m. 24th, N.N.W. ; 45m. 2Sth, N. 



Snow, ist,3d, 5th,6th,Stli, 14th, 17th, i8tli, 20th. 



Sleet, 3d 



Days of Sleighing, 8 



