LIBRARY or THE 



Massannisoiis .-^l,!'- ■ ' Pol lege, 



AMHERST 



BULLETIN No. 456. 



DECEMBER 1926 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGUICULTUIUL EXrEKlMENT 



STATION. 



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



Height of barometer above ground, jr/A Above sea level, 2jj.§ ft. 

 Height oj Wind Instruments J 2 ft. Time used, y^t/^Mer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.29, 5th, i A. 

 Minimum reduced to freezing, 29.19, 29th, 2 A. 

 Reduced maximum reading, 30.62, 5th, i a. 

 Reduced minimum reading, 29.50, 29th, 2 A. 



Mean semi-daily reduced 30.095 



Monthly range 1.12 



Air Temperature. 



In Degrees Fahr. 



Highest 43.0, ist,3P. 



Lowest -10.0, 27th, 7 A. 



Mean hourly 20.4 



Mean of means of max. and min 20.1 



Mean sensible (wet bulb) 18.0 



Monthly range 53° 



Highest mean daily 37-8, ist 



Lowest mean daily , . . . 5-6, i8th 



Mean maximum .30.2 



Mean minimum 10.0 



Mean daily range 20.2 



Greatest daily range 37°' 27th 



Least daily range 9°. 5th 



HumidKy. 



Mean dew point i4-5 



Mean force of vapor 114 



Mean relative humidity 78. 9 



Precipitation. In inches. 



Total precipitation, in inches 2.78 



Total snow, in inches 224 



Number of days on which .01 inch or more 



rain fell 10 



Days of sleighing 27 



Wind. 



Total movement 3645m 



Greatest daily movement 383m, 2d 



Least daily movement 12m, 27th 



Mean daily movement 117m 



Mean hourly velocity 4.9n) 



Maximum pressure per square foot, ii.o lbs= 



47m per hour, 6th, 2 P., N. 

 Maximum velocity for 5 minutes, 24m per 



hour, 6th, 2 P., N. 

 Prevailing direction, West, Northwest 



Summary. 



Northwest 



22 per cent 



West 16 ' 



Southwest 16 " 



North 16 " 



South 13 ' 



Other directions 17 ' 



Weather. 



Mean cloudiness observed . . . . 52 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 153 hours = 54 per cent 



Number of clear days g 



Number of fair days 10 



Number of cloudy days 12 



Briiiht Suufihine. 



Number hours recorded. 130= 46 per cent. 



Kain.Sth, 24th, 28th. 



Snow, 3d, 5th, 6th, 8th, loth, 15th, 20th, 26th, 



28th. 

 Gales. 36m, ist, N. W.: 45m, 2d, W.; 37m, 4th 



N.: 47ni, 6th, N.; 35m, i7tli, N. W.; 35m, 



22th, N. 



