B UL LETIN'No. 395 . NOVEMBER. 192 1 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGUICULTUIUL EXPERIMENT 



STATION. 



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



ffgij^ht of haro meter above ground, J/./?. Above sea level, 2yj.^ ft. 

 Height of Wind Instrmnents y2 ft. Time used, y^th Mer. 



MONTHLY SUMMARY. 



Pressute. In inches. 

 Maxinuim reduced to freezing, 30.20, 8th, 8 A 

 Minimum reduced to freezing, 29.20, 5th, 4 A 

 Reduced maximum reading . 30.52, 8th, 8 .\ 

 Reduced minimum reading, 29.50, 5th, 4 a 



Mean semi-daily reduced 30.0S1 



Monthly range i.o 



Air Temperature. In Degrees Fahr. 



Highest 66.0, 19th, 4:00 p 



Lowest 22.0, 8th, 7 A 



Mean hourly 37.4 



Mean of means of max. and min 37.9 



Mean sensible (wet bulb) 34.4 



Monthly range 44.0 



Highest mean daily 58. 3. igth 



Lowest mean daily 27.7, 24th 



Mean maximum 44.0 



Mean minimum 31.8 



.Mean daily range 12.2 



Greatest daily range 29.5 20th 



Least daily range 3.0, 19th 



Hnmidity. 



Mean dew point 30.6 



Mean force of vapor 0.223 



Mean relative humidity 80.3 



Precipitation. In inches. 



Total precipitation, in inches 6.20 



Xumter of days on which .01 inch or more 



rain fell 22 



Total Snow in inches 3.0 



'Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



M^ind. 



Total movement 4441 rn 



Greatest daily movement 424m, 5th 



Least daily movement i6m, 14th 



Mean daily movement 148m 



Mean hourly velocity 6.2m 



Maximum pressure per square foot, 18.5 lbs = 



61m per hour, 5th, 7 A, N.W. 

 Maximum velocity for 5 minutes, 36m per 



hour, 5th, 7 A. N.W. 

 Prevailing direction, North Northwest. 



Summary. 



North 27 per cent 



North Northeast 17 " " 



South Southwest 10 " " 



Northwest 13 " " 



Other directions 33 " " 



Weather. 



Mean cloudiness observed .... 66 [ler cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 196 hours = 67 per cent. 



Number of clear days 3 



Number of fair days 9 



Number of cloudy days iS 



Bright Sunshine. 



Number hours recorded, g;, = "iii per cent. 

 Kain, ist, 2d, 3d, 4th, 7th, 0th. lotli, litli, 12th, 



14th. 15th, 'i6th, 17th, i8th, 19th, 20th, 2i.st, 



24th, 25th, 26th, 27th, 28th. 

 Snow, 7th. 14th, 24th, 26th. 

 Frosts before the 15th, Sth, iitli, I3tli. 

 Hail, 9th, 24th, 28th. 



Gales, 6im, 5th, N.W.: 35m, 7th, N.W.; 

 35m, 15th, W.N.VV.: 36m, 19th, S.S. W. 



