METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51 ft. Above sea level, 2^3.5 ft. 

 Height of Wind histrianents J 2 ft. 



JANUARY, 1904. 



BULLETIN No. 181. 



MONTHLY SUMMARY. 



freasiire. In inches. 

 Maximum reduced to freezing, 30.56, 19th, 9 A. 

 Minimum reduced to freezing, 



29.09, 9th, 2 P., 14th, I P. 

 Reducedt maximum reading, 30.90, 19th, 9 A 

 Reducedt minimum reading, 



29.40, 9th, 2 p., 14th, I P. 



Mean semi-daily reduced, 3o.o!S-) 



Monthly range i-5o 



*Air Temperature. In IDegrees Fahr. 



Highest, 40.0, 23d, 3 P. 



Lowest —26.0, 5th, 7:30 A. 



Mean hourly, i4-3 



Mean of means of max. and min 14.3 



Mean sensible (wet bulb), 12.0 



Monthly range 66.0 



Highest mean daily, 33-3, 23d 



Lowest mean daily, —12.7,15th 



Mean maximum, 23.7 



Mean minimum, 4-9 



Mean daily range 18.8 



Greatest daily range, 32.5,11th 



Least daily range, 6.5, 14th, i8th 



H Httiid'ity , 



Mean dew point 9-3 



Mean force of vapor, 093 



Mean relative humidity, 85.- 



Precipitation. In inches. 



Total precipitation, 4.74 



Number of days on vvliich .01 inch or more 



rain or melted snow fell, 12 



Snow, total in inches 23^ 



Snow on ground at end of month, . 13 inches 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



JVind. 



Total movement, 4112 m. 



Greatest daily movement, 3i5ni., 3d 



Least daily movement, om., 7th 



Mean daily movement, ^23^- 



Mean hourly velocity, • j-Sni. 



.Maximum pressure per square foot, 11. lbs.= 



47 ni. per hour, 17th, 5 A., W. 

 Prevailing Direction, North, Northwest. 

 Sumniary. 



North, 29 per cent. 



Northwest, 19 " " 



North, Northwest, '3 " " 



South, 10 " " 



Other directions, 32 " " 



Weather. 

 Mean cloudiness observed, .... 55 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 150 hrs.=5i per cent. 



Number of clear days, 12 



Number of fair days, 5 



Number of cloudy days, 14 



Bright Sitnahine. 

 Number of hours recorded, . . . 144 hrs.=49)t 

 Rain, 13th, 22d,23d. 

 Snow, 2nd, 3rd, 7th. 8th, 9th, 13th, i6th, 20th, 



21st, 22d, 23d, 26th, 29th. 



Liffhtning, .... • . . . • 22d 



Qales, 35 miles or more per hour, 44ni. 3d, 



N.; 35 m. 4th, N.W.: Z7 m- Mth, W.S.W.; 



47 m. 17th, \V.; 43 m. 25th, VV. 

 Day* of sleighing, 31 



