METEOROLOGICAL OBSERVATORY 



llalch Experinieiit Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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

 Height of Wind Instruments 72 ft. 



BULLETIN No. 157. 



JANUARY, 1902. 



MONTHLY SUMMARY. 



I're.isiirp. In inches. 



Maximum reduced to freezing, 30.34. 29th. 2 A 

 Mininuim reduced to freezins;, 28.85, i2tli, 7 A 

 Reducedt maximum reading, 30.66, 29th, 2 A 

 Keducedt minimum reading, 29.17, 12th, 7 A 



Mean tri-daily reduced, 30.042 



Monthly range • 1.49 



L 



*Ait' Temperature. In Degrees Fahr. 



Higliest, 47-0, 22d, 8 A 



Lowest -0.5, 20th, 8 A. 



Mean hourly, 22.9 



Mean of means of max. and min., .... 22.2 



Mean sensible (wet bulb), 20.4 



Monthly range 4 



Highest mean daily, 4i-9, 22d 



Lowest mean daily, S.o. 4th 



Mean maxinuim, 31.4 



Mean minimum, .... 13.0 



Mean daily range, 18.4 



Greatest daily range, 34.0.18th. 



I-east daiiy range, 7.5. Stli. 



Miimitliti/. 



Mean dew point 12.3 



Mean force of vapor 134 



Mean relative humidity, 66.2 



Precipitfitioii. In inches: 



Total precipitation, . • 1.72 



.N'unilxjr of days on which 01 inch or more 



rain or melted snow fell 11 



.Smow, total in inclies 11 



Snow on ground at end of month, . . i inch. 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Total movement 4078m. 



Greatest daily movement, .... 369 ni., 2Slh. 



Least daily movement, ijm., lotli. 



Mean daily movement 131.5 ni. 



Mean hourly velocity, 5.5 m. 



Maximum pressure per square foot, i2.olbs.:= 

 49 m. per hour, 28th, 7 A., N.N.E. 



Prevailing Direction, North. 

 Summary. 



Xortheast, 13 per cent. 



North Northeast, 19 " " 



West, 16 " " 



Northwest, 10 " " 



North Northwest, 13 *' " 



East Northeast, 16 " " 



Other directions 13 " " 



Weather. 



Mean cloudiness observed, .... 60 per cent. 



Total cloudiness recorded by the Sun 'Ther- 

 mometer, 174 hrs.=59 per cent. 



Number of clear days, S 



Number of fair days, 6 



Number of cloudy days 17 



Urifflit Sunshine. 



Number of hours recorded, . . . 120 lirs.=4H( 



Hain, 2ist, 22d, 26th, 27th. 



Snoir, 3d. 7th, 8th, loth, nth, 12th, 21st, 

 26th. 30th, 31st. 



Oalvs, 35 miles or more per liour, 45m., 

 ist, N.W.: 36m., 2d, W.: 41m., 3d, N.N.E.; 

 35111., 22d, S.S.E.: 36m., 27th, N.N.E.; 

 49ni., 2Sth, N.N.E. 



No. days sleighing, 11 



