BULLETIN No. 401. 



MAY. 1922 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGRICULTUIUL EXPERIMENT 



STATION. 



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



Heij^ht of barometer above ground, 51 ft. Aboi'e sea level, 2jj.^ ft. 

 Height oj Wind Instrutnents 72 ft. Time used, j^th Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing, 30.18, ist, 8 a 

 Minimum reduced to freezing, 29.24, 19th, 9 a 

 Reduced maximum reading 30.48; ist, 8 a 



Reduced minimum reading, 29.53, i9th, 9 x 



Mean semi-daily reduced 30.016 



Monthly range 0.95 



Air Temperature. 



In Degrees Fahr. 



Higliest 87.5, 30th, 4 p 



Lowest 28.0, ist, 6 A 



Mean hourly 59. 8 



Mean of means of max. and min 60.0 



Mean sensible (wet bulb) 53. 8 



Monthly range 59.5 



Highest mean daily 69.2. 30th 



Lowest mean daily 44.9, 5th 



Mean maximum 74.5 



Mean minimum 45.5 



Mean daily range 29.0 



Greatest daily range 42.0, ist 



Least daily range 7.0, 5th 



Humidity. 



Mean dew point 49.4 



Mean force of vapor 512 



Mean relative humidity 72.2 



M'ind. 



Total movement 4516 m 



Greatest daily movement 398m, Sth 



Least daily movement 62m, 6th 



Mean daily movement 146m 



Mean hourly velocity 6.1m 



Maximum pressure per square foot, 11. o lbs = 



47m per hour, 7th, 5 P, \V..S.W. 

 Maximum velocity for 5 minutes, 27 m per 



hour, Sth, 2 P.. N.W. 

 Prevailing direction, West Northwest. 



Summary. 



South Southwest 19 per cent 



North Northwest 16 " " 



West Southwest 13 " " 



North Northeast . . .' 10 " " 



Northwest 10 " " 



Other directions 34 " " 



Weather. 



Mean cloudiness observed .... 34 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . .119 hours = 26 per cent. 



Number of clear days 19 



Number of fair days 9 



Number of cloudy days 3 



Briiiiht Sunshine. 



Number hours recorded, 334, = 71 per cent. 



Kain. 4th, 5th, 7th. 13th, iSth, 19th, 25th, 26th. 



Frosts. 1st, I2th. 

 Precipitation. In inches. iHail. 19th 



Total precipitation, in inches 5.47 Thunder and Liiihtniuii, 7th, 19th. 



Number of days on which .01 inch or more ^Gales. 47m, 7tli. W.SW.: 46m, 8tli, N.W.: 



rain fell 



37m, nth, N.W.: 44m, 19th, S.S.W. 



'Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



