BULLETIN No. 394. 



OCTOBER, I 92 1 



Meteorolooical Observations 



AT THK 



MASSACHUSETTS 



AGUICULTUIUL EXPEKIMENT 



STATION. 



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



Height 0/ ha ro meter above ground, jf ft. Above sea level, ^/j.j ft. 

 Height oj Wind Instruments J 2 ft. Time used, j^thMer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing, J0.17, 26th, 8 A 

 Minimum reduced to freezing, 29.03, 20th, 3 p 

 Reduced maximum reading . 30.48,26th, 8 .\ 

 Reduced minimum reading, 29.33, 20th, 3 p 



Mean semi-daily reduced 29.974 



Monthly range 1.15 



Air Temperafiire. In Degrees Fahr. 



Highest 79.5, 15th, 3:00 P 



Lowest 21.5, 27th, 7 A 



Mean hourly ■ $0.4 



Mean of means of ma.x. and min 50.9 



Mean sensible (wet bulb) 44.4 



Monthly range : 



Highest mean daily 60.5. 2d, 3d 



Lowest mean daily ....,.".. 37.1, 26th 



Mean maximum 63.3 



Mean minimum 38.4 



Mean daily range 24.9 



Greatest daily range 48.5 15th 



Least daily range 7.0, 21st 



HamiflKy. 



Mean dew point 40.3 



Mean force of vapor 34S 



Mean relative humidity 76.3 



Precipitation. In inches. 



Total precijjitation, in inches i.oS 



Number of days on which .01 inch or more 

 rain fell 5 



•Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind, 



Total movement ^^g^ „, 



Greatest daily movement 305m, 21st 



Least daily movement 29m, 29th 



Mean daily movement 145m 



Mean hourly velocity 6.0m 



Maximum pressure per square foot, 12.0 lbs= 



49m per hour, loth, 2 ?, S.S.E. 

 Maximum velocity for 5 minutes, 30m per 



hour, loth, 2 p, S.S.E. 

 Prevailing direction. Southwest. 



Summary. 



South Southwest 32 per cent 



Northwest 13 



Southwest 10 



South 10 



North 10 



Other directions 25 



Weather. 



Mean cloudiness observed .... 42 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 135 hours = 37 per cent. 



Number of clear days n 



Number of fair days 10 



Number of cloudy days 10 



Briight Sunshine. 



Number hours recorded, 206, = 68 per cent. 

 Rain, 3d, 8th, 9th. loth, 12th, 19th, 20th, 25th. 

 Thunder and Li^htninti, 12th, 20th. 

 Frosts, 9th, 13th, i4tii, ijth, 26th, 27th, 2Sth, 



29th, 30th, 31st. 

 Gales. 35m, Sth, S.S.W.; 49ni, loth, S.S.E. 



35m, i2th, W.N.W.; 36ni, 23d, N.W. 



