BULLETIN No. 375. 



MARCH, I920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATIOIM. 



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



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

 Height oj Wind Instruments 22 ft. Time tised, y^thMer. 



MONTHLY SUMMARY. 



Pressnie. In inches. 

 Maximum reduced to freezing, 30 24, 4th, 9 a 

 Minimum reduced to freezing, 28.72, 13th, 5 P 

 Reduced maximum reading . 30.55, 4th, 9 a 

 Reduced minimum reading, 29.03, 13th, 5 p 



Mean semi-daily reduced 29.972 



Monthly range 1 



♦Air Temperature. In Degrees Fahr. 



Highest 70.5,25th, 3.30 p 



Lowest -i.o, 2d, 7:30 A 



Mean hourly 34 



Mean of means of max. and min 34 3 



Mean sensible (wet bulb) 30.; 



Monthly range 71.5 



Highest mean daily 47.1.28th 



Lowest mean daily 14.5, 2d 



Mean maximum 45.4 



Mean minitnum 23 2 



Mean daily range 22.2 



Greatest daily range 43.5,25th 



Least daily range 4.0, 5th 



Humidity. 



Mean dew point 26.6 



Mean force of vapor 202 



Mean relative humidity 78.2 



Precipitation. In inches. 



Total precipitation, in inches 2.90 



Total snow, in inches 5.75 



Number of days on which .01 inch or more 



rain fell 11 



Days of sleighing, 22. 



•Temperature in ground shelter. 

 '•Reduced to freezing and sea-level. 



Wind. 



Total movement 6263 m 



Greatest daily movement ..... 537m, 6th 



Least daily movement 54ni, iit>i 



Mean daily movement 202m 



Mean hourly velocity 8.4m 



Maximum pressure per square foot, 16.0 lbs= 



57m per hour, 6th, 10:30 A, N.W. 

 Maximum velocity for 5 minutes, 36m per 



hour, 6th, 11 A, N.W. 

 Prevailing direction, West. 



Summary. 



West 19'per cent 



West Northwest 16 •' 



South Southwest 16 ' 



West Southwest 13 ' 



Northwest 13 " 



Other directions 23 " 



Weather. 



Mean cloudiness observed .... 41 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 129 hours = 35 per cent. 



Number of clear days 16 



Number of fair days 10 



Number of cloudy days 5 



Bright Sunshine. 



Number hours recorded, 242 hrs, = 65 per cent. 

 Rain. 5th. nth, I2tli, 13th, 17th, 26th, 27th, 



29th, 30th, 31st. 

 Snow. 19th, 20th. 

 Gales, 57111 6th, N.W.; 36m, 7th, W.; f4om, 



14th, W. N. W.; 36m, 17th, W.N. W.; 35m, 



iSth. N.W. 



