..toasACuuseUs Agricultural College, 



AMHERST, MASS. 



BULLETIN No. 424. 



APRIL. 1924 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, Ji ft. Above sea level, 2yj.j ft. 

 Height oj Wind Instruments y2 ft. Tifiie used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing 30.10, 6th, 6 A 

 Minimum reduced to freezing;, 29.13, 7th. 9 A 

 Reduced maximum reading, 30.41, 6th, 6 a. 

 Reduced minimum reading, 29-43, 7th, g a. 



Mean semi-daily reduced 29.954 



Monthly range 0.9S 



Air Temperature. In Degrees Fahr. 



Highest 71.0, 28th, 4 p. 



Lowest 22.0, ist, 5:3oa. 



Mean hourly 44.3 



Mean of means of max. and min 44.2 



Mean sensible (wet bulb) 38 6 



Monthly range 49.0 



Highest mean daily 53.0, 27th 



Lowest mean daily 29.8, ist 



Mean maximum 53.9 



Mean minimum 34.4 



Mean daily range 19.5 



Greatest daily range 37.0, 4th 



Least daily range 5.0, iSth 



Humidity. 



Mean dew point 31.9 



Mean force of vapor 2S6 



Mean relative humidity 66.9 



Precipitation. In inches. 



Total precipitation, in inches 4.54 



Total snow, in inclies 8.0 



Number of days on which .01 inch or more 



rain fell 11 



Days of sleighing 2 



Wiiifl. 



Total movement ;83om 



Greatest daily movement 364m, 2d 



Least daily movement 78m, 29th 



Mean daily movement i95m 



Mean hourly velocity 8.1m 



Maximum pressure per square foot, 23.5 lbs = 



69m per hour, 14th, 3 p., N. W. 

 Maximum velocity for 5 minutes, 36m per 



hour, 14th, 3 p., N. W. 

 Prevailing direction, North Northwest. 

 .Summary. 



North 17 per cent 



Northwest '3 " " 



West 13 " " 



South Southwest 10 " " 



Other directions 47 " " 



Weather. 



Mean cloudiness observed .... 47 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 114 hours = 28 per cent. 



Number of clear days 16 



Number of fair days u 



Number of cloudy days 3 



Bright Sunshine. 



Number hours recorded, 28S = 72 per cent. 



Rain, 6th, 7th, 8th, 9th, iSth, 19th, 20th, 21st, 



22d, 30th 



Snow ist, 2d, 8th. 



Thunder and Litihtning, 22d. 



Gales, 43m., ist, N. N. W.: 4ini., 6th, E.N.E.; 

 69m., 14th, \. W.: 45m., 19th, N. W.; 35ni , 

 22d, N.; 42m., 23d, N. \V.; 51 m., 24th, 

 N. N. W.; 35m., 25th, N. N. E.; 45m., 26th, 

 N.; 35m., 27th, N. N. \V.: 36m., 2.Sth, S. 

 S. W.; 35m, 30th, S. 



