\RY OF THE 



Aariciiltural College, 



AMHERSl , MASS. 



BULLETIN No. 436. 



APRIL. 1925 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGllICULTUllAL EXPEUIMENT 



STATION. 



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



Height of barometer above ground, 31 ft. Above sea level, 27 j.^ ft. 

 Height oj Wind Instruments 72 ft. lime used, y^thMer. 



MONTHLY SUMMARY. 



Pressiir 



In inches. 



Maximum reduced to freezing, 30.23, 21st, 10 a 

 Minimum reduced to freezing, 29.27, ist, 12 m. 

 Reduced maximum reading, 30.53, 21st, 10 A 

 Reduced minimum reading, 29.57, ist, 12 m 



Mean semi-daily reduced 30031 



Monthly range 0.96 



Air Temperature. In Degrees Fahr. 



Highest 82.0, 26th, 3 p 



Lowest 25.5, 2ist, 6 A. 



Mean hourly 48.0 



Mean of means of max. and min 47.5 



Mean sensible (wet bulb) 43.^ 



Monthly range 56.5 



Highest mean daily 67.0, 26th 



Lowest mean daily 33.6, 20th 



Mean maximum 59. 



Mean minimum 35.5 



Mean daily range 240 



Greatest daily range 42.5, 22d 



I^east daily range 4.5, 30th 



Humidity. 



Mean dew point 39.8 



Mean force of vapor 33 



Mean relative humidity 78. 



Precipitation. In inches. 



Total precipitation, in inches 3.10 



Total snow, in inches 



Number of days on which .01 inch or more 

 rain fell 



Winil. 



Total movement 526Sm 



Greatest daily movement 284m, 14th 



Least daily movement 74m. 2d 



Mean daily movement 176m 



Mean hourly velocity 7.3ni 



Maximum pressure per square foot, 11. o lbs = 



47in per hour, 27th, 3 p., N.W. 

 Maximum velocity for 5 minutes, 2Sm per 



hour, 27th, 3 p., N W. 

 Prevailing direction. Northwest. 



Summary. 



North 20 per cent 



North Northeast 13 '" " 



South 13 " " 



West 13 " " 



Northeast 10 " " 



Southwest 10 " " 



Other directions 21 " " 



Weather. 



Mean cloudiness observed .... 34 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 162 hours = 40 per cent. 



Number of clear days 9 



Number of fair days 15 



Number of cloudy days 6 



Briiibt Sunshine. 



Number hours recorded, 240 = 60 per cent. 

 Kain. loth. 13th, 14th, 15th, igtli. 20th. 25th, 



30th. 

 Snow, 15th, 19th, 20th. 

 Frosts after the 15th. 17th, 21st, 22d. 

 Gales, 35m, 9th, N.; 40m, 15th, N.W.: 37m, 



17th, S.; 47m, 27th, N.W. 



