AWlHE-HST, U.^ 



BULLETIN No. 448. 



APRIL 1926 



Meteorological Observations 



AT THR 



MASSACHUSETTS 



AGRICULTUIUL EXPEllIMENT 



STATION. 



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



Hei^:;ht of barometer above ground, jT ft. Above sea level, 2jj.^ ft. 

 Height oj IVifiii Instnifnents Y2 ft. Time used, j^thAIer. 



MONTHLY SUMMARY. 



'ressute. 



In inches. 



Maximum reduced to freezing, 30.02, 13th, 6 a. 

 Mininuim reduced to freezing, 29.04, ist, 4 a. 

 Red\iced maximum reading, 30.34, 13th, 6 A. 

 Reduced minimum reading, 29.35,1st, 4 a. 



Mean semi-daily reduced 29.926 



Monthly range 0.99 



Air Temperature. In Degrees Fahr. 



Highest 75.?, 22d, 3 p. 



Lowest 18.0, i2th, 6 a. 



Mean hourly 41.4 



Mean of means of max. and niin 41.2 



Mean sensible (wet l^ulb) 37.7 



Monthly range 57.5 



Highest mean daily 59.8, 22d 



Lowest mean daily 32.1, 12th 



Mean maximum 51.7 



Mean mininnnn 30.9 



Mean daily range 20. S 



Greatest daily range 36.5, 21st 



Least daily range b.o, Sth 



Humidity. 



Mean dew point 32. 8 



Mean force of vapor 271 



Mean relative humidity 75.0 



Precipitation. In inches. 



Total precipitation, in inches 3.62 



Total snow, in inches, 34 



Number of days on which .01 inch or more 

 rain fell 10 



M'iiid. 



Total movement 6063m 



Greatest daily movement 3S6m, 26th 



Least daily movement 75m, 7th 



Mean daily movement 202m 



.Mean hourly velocity 8.4ni 



Maximum pressure per square foot, 8.5 lbs = 



4ini per hour, 17th, 2 ;•., N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 17th. 4 p., N.W. 

 Prevailing direction, West Northwest. 

 Summary. 



Northwest 23 per cent. 



West 20 " " 



West Northwest 10 " " 



Southwest 10 " " 



North 10 " " 



Otlier directions 27 " " 



Weather. 



Mean cloudiness observed .... 49 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 20S hours = 52 per cent 



Number of clear days 13 



Number of fair days 8 



Number of cloudy days 9 



Rri^ht Sunshine. 



Number hours recorded. 195 =48 per cent. 

 Rain. Ist, 3d, 5th, 7th, Stli, 9th, 16th, 22d, 



24th, 25th. 28th, 30th. 

 Snow, ist, 3d, 7th. 

 Fro«it«i after the 15th, iSth, 19th, 20th, 21st, 



2;th. 

 Thunder and Li^htninii. 22d, 24th. 

 Gales. 35m. 4th, N.W.: 35m, 5th, W.: 40m. 



15th, SW.: 35m. i6th,S.: 41m. 17th, N.W. ; 



37ni. 20th. N.W.; 36m. 22d, W.N.W.; 3gm. 



25th, S.S.W. 



