BULLETIN No. 386. 



FEBRUARY. 192 1 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



Latitude, 42° 23' 4S.5" N. Longitude 72* 31' 10" VV. 



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

 Height oj Wind Instruments y 2 ft. I'ime used, y^th Mer. 



MONTHLY SUMMARY. 



Pressure. In inclies. 

 Maximum reduced to freezing,3o.20, ist, lo A 



19th, S A. 

 Minimum reduced to freezing, 29.12, nth, 6 p 

 Reduced maximum reading . 30.52, ist, loA, 



19th, 8 A. 

 Reduced minimum reading, 29.43, nth, 6 p 



Mean semi-daily reduced 30.083 



Monthly range 1.09 



*Air Temperature. 



Highest 



In Degrees Fahr. 

 55.0, i6th, 4 p 



Lowest -4.0, 25th, 7 A 



Mean hourly 27.7 



Mean of means of max. and min 27.5 



Mean sensible (wet bulb) 23.0 



Monthly range ;g.o 



Highest mean daily 40.1. 16th 



Lowest mean daily ii.o, 25th 



Mean maximum 36.9 



Mean minimum 1S.2 



Mean daily range 18.7 



Greatest daily range 37.0, 26th 



Least daily range 6.0, iitli 



Humidify. 



Mean dew point 16.2 



Mean force of vapor 149 



Mean relative humidity 68.4 



Precipitation. In inches. 



Total precipitation, in inches 2.38 



Total snow, in inches 2oi 



Number of days on which .01 inch or more 



rain fell 9 



Days of Sleighing, 16 

 •Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 3835 m 



Greatest daily movement 337m, 17th 



Least daily movement 27m 26th 



Mean daily movement I37ni 



Mean hourly velocity 5.7 m 



Maximum pressure per square foot, 10.5 lbs= 



46m per hour, 14th, 5 p, N.N.W. 

 Maximum velocity for 5 minutes, 27m per 



hour, 17th, 2 P, N.W. 

 Prevailing direction. Northwest. 



Summary. 



North Northeast 18 per cent. 



West Northwest 14 



South Southwest 14 



Northwest 14 



North 21 



Other directions 19 



Weather. 



Mean cloudiness observed .... 63 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 119 hours = 40 per cent. 



Number of clear days 10 



Number of fair days 10 



Number of cloudy days 8 



Bright Sunshine. 



Number hours recorded, 177 hrs, = 60 per cent. 

 Rain, 5th.6th, 23d, 27th, 2Stii. 

 Snow, 2d, 7th, 9th, nth, iSth, 20th, 23d, 27th 

 Gales, 46m. 14th, N.N.W.; 40m, i7tli, N.W. 



