•uab>ai, , , ,,iculUiral Col' 



AMHERST, MA J 



BULLETIN No. 4 17. 



SEPTEMBER, 1923 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGUICULTUKAL EXPEIUMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height oj Wind Instruments 72 //. Time used, y^th Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. I Wind. 



Maximum reduced to freezing, 30.15, 27th 8a. Total movement 2704m 



Minimum reduced to freezing, 29.46, 29th.4 P. ^'''^^'^^f'^^'^y ™°^^"^^"^ 195'", 8th 



Reduced maximum reading, 50.45 I7th Sa. I ^east daiy movement 43m, nth 



Reduced minimum reading, 29.74, 29th, 4P'f^^" daily movement 90m 



Mean semi-daily reduced ^^^^^i Mean hourly velocity 3.7 



Monthly range 71 



Air Temperaliire. 



In Degrees Fahr. 



Highest 86.5,1st, 2-30P 



Lowest 30 5, i8th, 6a 



Mean hourly 62.9 



Mean of means of ma.x. and min 63.9 ^^''^^ Northwest 20 per cent 



Ma.xinuim pressure per square foot, 3.5 lbs = 



26m per hour, 8th, 11 a., S. 

 Maximum velocity for 5 minutes, i8m per 



hour, 8th, 10 A., S. 

 Prevailing direction, West, Northwest. 



Summary. 



Mean sensible (wet bulb) 57.; 



Monthly range 56.0 



Highest mean daily 72.0, 4th 



Lowest mean daily ......... 51.0, 15th 



Mean maximum 75.6 



Mean minimum 52.2 



Mean daily range 23.4 



Greatest daily range 49.0, iSth 



Least daily range 4.0123d 



Humidify. 



Mean dew point 54.4 



Mean force of vapor 546 



Mean relative humidity 81.5 



Precipitation. In inches. 



Total precipitation, in inches 1.89 



Number of days on which .01 inch or more 

 rain fell 



South 23 



South Southeast 13 



North 10 



Northwest 10 



Other directions 24 



Weather. 



Mean cloudiness observed .... 50 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 149 hours = 40 per cent. 



Number of clear days 9 



Number of fair days 14 



Number of cloudy days 7 



Bright Sunshine. 



Number hours recorded, 224 = 60 per cent. 

 Rain, 3d, 7th, 8th, 13th, 20th, 2ist, 22d, 23d, 



26th, 2Sth. 

 Thunder and Li(ih(nin£, 13th, 23d, iSth. 

 Gales, none. 



