BULLETIN No. 376. 



APRIL, 1920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

 Height oj Wind Instruments J 2 ft. I'ime used, y^thMer. 



MONTHLY SUMMARY. 



Pressnie. In inches. 



Maximum reduced to ffeezing, 29. S4, ist, S a; 



26th, S A. 

 Minimum reduced to freezing, 28.89, 5th, 5 p 

 Reduced maximum reading . 30.14, ist, 8 A 



26th, S A. 

 Reduced minimum reading, 29.20, 5th, 5 p 



Mean semi-daily reduced 29,823 



Monthly range 0.94 



♦Air Temperature. In Degrees Fahr. 



Highest 74-5. 20th, 3 p 



Lowest 22.0, 9th, 5 a; loth, 6 a 



Mean hourly 43-2 



Mean of means of max. and min 43.2 



Mean sensible (wet bulb) 3S.6 



Monthly range 52.5 



Highest mean daily 53-6. 20th 



Lowest mean daily 29.4, 8th 



Mean maximum 52-5 



Mean minimum 33 9 



Mean daily range 18.6 



Greatest daily range 43.0, 20th 



Least daily range 3.5, 2d 



Humidity. 



Mean dew point 33.2 



Mean force of vapor 277 



Mean relative humidity 72.5 



Precipitation. In inches. 



Total precipitation, in inches 4 



Total snow, in inches 1.5 



Number of days on which .01 inch or more 



rain fell 12 



Days of sleighing. None. 

 •Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 615S m 



Greatest daily movement 507m, 6th 



Least daily movement 63m, 22d 



Mean daily movement 205m 



Mean hourly velocity 8. 5m 



Maximnm pressure per square foot, 8.5 lbs = 



41m per hour, 6th, i p, W.N.W. 

 Maximum velocity for 5 minutes, 35m per 



hour, 6th, 1 p, W.N.W. 

 Prevailing direction, West Nort'iwest. 



Summary. 



West 13 per cent 



West Northwest 20 "' " 



South .Southwest 10 " " 



North 13 " " 



Northwest 13 " " 



Other directions 31 " 



Weather. 



Mean cloudiness observed .... 51 percent 

 Total cloudiness recorded by the Sun 



Thermometer . . 184 hours = 46 per cent. 



Number of clear days 13 



Number of fair days 5 



Number of cloudy days 12 



Bright Suusliine. 



Number hours recorded, 218 hrs, = 54 per cent. 

 Rain. 4th. 5th, 6th, 7th, 8th, 12th, 13th, 15th, 



2ist, 23d, 24th. 27th, 2Sth, 29th. 

 Snow. 4th, 6th, 7th, 8th. 

 Tiiunder and Liiihtninii, 23d. 

 Frost, after the 15th: iStli, 2ot]i, 26tli. 

 Gales. 41m. 6th, W.N.W.; 37111, 13th, S.S.W.: 



37m, 24tli, N. W. 



