METEOROLOGICAL OBSERVATORY 



OF THI-: 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, ^i ft. Above sea level, 2'jj.^ ft. 



Height of Wind Instruments 72 ft. 



FEBRUARY, 1902. 



BULLETIN No. 158. 



MONTHLY SUMMARY. 



Pressure, In inches. 

 iMaxinium reduced to freezing, 29.95, ist, 11 A. 

 Minimum reduced to freezing, 28.54, 17th, 11 p- 

 Reducedt maximum reading, 30.27, ist, 11 A. 

 Reducedt minimum reading, . 2S.86, 2d, 6 p., 



17th, IIP. 



Mean tri-daily reduced, 29.782 



Montiily range • 1.41 



*Air Temperature. In Degrees Fahr 



Highest, ■• - .54-0, 27th, 2 P. 



Lowest, 5-0, 6th, 6 a. 



Mean hourly, 25.5 



Mean of means of max. and min., .... 25.3 



Mean sensible (wet bulb), 23.1 



Monthly range 49° 



Highest mean daily, 42.3, 27th 



Lowest mean daily 13.3, 5th. 



Mean maximum, 33.3 



Mean minimum, 17.2 



Mean daily range 16. i 



Greatest daily range, 33.0.23d. 



Least daily range 3.5, 17th. 



Ilutnidlty. 



Mean dew point, 15. i 



Mean force of vapor, 152 



Mean relative humidity, 66.8 



Frecipitation. In inches. 



Total precipitation, 3.54 



Number of days on which .01 inch or more 



rain or melted snow fell, 10 



Snow, total in inclies, 8.25 



Snow on ground at end of month, .... o 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Total movement 5199m. 



Greatest daily movement, 505 m., 3d. 



Least daily movement 35m., 12th. 



Mean daily movement 185.7 m- 



Mean hourly velocity, 7-7 m. 



Maximum pressure per square foot, 24.0 lbs.= 



69 m. per hour, 3d, 4 P., N.N.W. 

 Prevailing Direction, Northeast. 



Summary. 



Northeast 14 per cent. 



North Northeast, 21 " " 



East Northeast 29 " " 



Other directions 36 " " 



Wenther. 



Mean cloudiness observed, . . . . 63 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . ... 158 hrs.=53 per cent. 



Number of clear days, 10 



Number of fair days, 6 



Number of cloudy days, 12 



Bright Sunshine. 



Number of hours recorded, . . . 138 hrs.=47)( 



Rain, ist, 2d, 25th, 26th, 28th. 



Snow, 1st, 2d, 3d, 4th, 13th, 17th, 21st, 22d. 



Gales, 35 miles or more per hour, 60m., 

 2d, N.N.W.: 69m., 3d, N.N.W.; 44m., 8th, 

 N.; 40m., 17th, E.; 43m., iSth, N.N.E.; 

 38m., 19th, N.N.E. 



No. days sleighing, 3 



