BULLETIN No. 265. 



JANUARY. I9lp 



Meteorological Observations 



AT THE . 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, ^TS-S f^- 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxinuuii leduced to freezing, 30.34, 24th, 8 A. 

 Minimum lecUiced to freezing, 28.85,30th, 7 a. 

 lieduced! maximum reading, 30.66, 24th, 8 a. 

 Reducedf minimum reading, 29.16, 30th, 7 A 



Mean semi-daily reduced. 30.139 



Monthly range, 1.50 



*Air Temperature. In Degrees Fahr. 



Highest, 50.5, 2d, 7:30 P. 



Lowest, 1.5, 18th, 7 A. 



Mean hourly, 27.4 



Mean of means of max. and min., .... 27.5 



Mean sensiljle (wet bulb), 24.5 



Monthly range 49.0 



Highest mean daily 44.3, 2d 



Lowest mean daily, 10.5, i6th 



Mean maximum, 35.8 



Mean minimum 19.2 



Mean daily range, 16.6 



Greatest daily range, 31.0,30th 



Least daily range 4-o, 14th, 27th 



Huini<lit.v. 



Mean dew point, i9-7 



Mean force of vapor 154 



Mean relative humidity 78-8 



Precipitation. In inches. 



Total precipitation, 2.36 



Number of days on which .01 inch or more 



rain fell ■ M 



Total snow in inches i-7; 



♦Temperature in ground shelter. 

 Keduced to freezing and sea-level. 



Wind. 



Total movement, 6085m 



Greatest daily movement, .... 5o5ni. ,30th 



Least daily movement, 25m., 14th 



Mean daily movement 196 ni 



Mean hourly velocity, 8.2 m 



Maximum pressure per square foot, 19.0 lbs. = 



62m. per hour, 30th, 5 p., W. 

 Maximum velocity for S minutes, 50m. per 



hour 30th, 5 P., W. 

 Prevailing Direction. West. 



Summary. 



Northwest 19 per cent 



South Southwest 10 " " 



South 10 " " 



West Northwest 23 " " 



West 13 " " 



Northeast, 10 " " 



Other directions 15 " " 



Weather. 



Mean cloudiness observed, .... 62 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, i49hrs.=5i per cent. 



Number of clear days, 9 



Number of fair days, 10 



Number of cloudy days, 12 



Bright Sunshine. 



Numl)er of hours recorded, . . 145 hrs.=49* 



Rain, ist, 2d, 3d, 4th, Sth, 9th, nth, I2th,i3th, 

 14th, 2ist, 26th, 27th, 28th, 29th. 



Snow 4th, 6th, 9th, 14th, ijth, 26th, 27th, 

 29th, 30th. 



Days Sleighingr, None. 



Gales, 35 or more miles per hour : 41m, 9th, 

 W.N.W.; 40m, loth, N.N.W.; 40m, i6th, 

 W.N.W.; 57m, 28th, W.N.W.; 62m, 30th, 

 \V.: 39m, 31st, W.N.W. 



