BULLETIN No. 253. 



JANUARY, 19 10 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

 Height of Wind Itistniments 72 ft. 



MONTHLY SUMMARY. 



FreBSure, In inches. 



Maxmuun reduced to freezing, 30 53, 4th, 11 p. 

 Minimum reduced to freezing, 28.80, 2qth, 5 P. 

 Reduced! maximum reading, 30.87, 4th, 11 p. 

 Keducedt minimum reading, . 29.11, 2Qth, 5 p. 



Mean semi-daily reduced, 30.114 



Monthly range 1.76 



*Air Temperature. In Degrees Fahr. 



Highest, 56-0. 22d, 3:30 A. 



Lowest —90, 5tli. 5:30 A. 



Mean hourly, 25.5 



Mean of means of max. and min 26.2 



Mean sensible (wet bulb), 22.3 



Monthly range, 65-° 



Highest mean daily, 42.6, 22d 



Lowest mean daily, 0.0, 5th 



Mean maximum, 35-4 



Mean minimum, i7'i 



Mean daily range 1S.3 



Greatest daily range, 40.5, ist 



Least daily range, 2.5, 25th 



Hutniditi/. 



Mean dew point, 18.2 



Mean force of vapor, 142 



Mean relative humidity, 80.9 



Freeipitation. In inches. 



Total precipitation, 6.14 



Number of days on which .01 inch or more 



rain or melted snow fell, -13 



Total snow in inches i9-5 



• Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 57S6m. 



Greatest daily movement, .... 430m., 4th. 



Least daily movement, 28m., 17th. 



Mean daily movement i87ni. 



Mean hourly velocity, 7.8 m. 



Maximum pressure per square foot, 15.0 lbs.= 

 55m. per hour, 3d, 11 p., N.N.W. 



Maximum velocity for 5 minutes, 40m. per 

 hour 4th, 2 A., N.N.W. 



Prevailing Direction. North Northwest. 

 Summary. 



Northeast 16 percent. 



North 13 " " 



North Northeast 13 " " 



West Southwest 13 " " 



West 10 " " 



Other directions, 35 " " 



}yeather. 



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



Total cloudiness recorded by the Sun Ther- 

 mometer, i75hrs.=6o per cent. 



Number of clear days, 5 



Number of fair days, 12 



Number of cloudy days, 14 



Kright Sunshine, 



Number of hours recorded, . . 119 hrs. = 40^ 



Rain, 6th, 7th, 18th, 21st, 22d, 25th, 26th, 29th. 



Snow, 3d, 5th, 7th, 14th, ijth, iSth, 27th, 28th^ 



29th, 30th. 



Days Sleighing, 25. 



Gales, 35 miles or more per hour; 55ni. 



3d, N.N.W.; 51m, 4th, N.N.W.; 135m, 7th, N.; 



46m, loth, N.E.; 36m, 14th, N.E.; 44m, 15th, 



N.E.; 36m, i8th, W.; 39m, 21st, S.S.W.; 40m, 



22d, W.S.W. 



