MassachiisGtts Agricultural CoUesre. 

 AMHERST, MASS. 



BULLETIN No. 4 13. 



MAY. 1923 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above groimd, S^ .ft- Above sea level, 2yj.^ ft. 

 Height oj Wind Instruments 72 ft. Ti?ne used, y^th Mer. 



MONTHLY SUMMARY. 



Pressure. In inches 



Maximum reduced to freezing 



24th, 8a. 

 Minimum reduced to freezing, 

 Reduced maximum reading, 



24th, 8a. 

 Reduced minimum reading. 



Mean semi-daily reduced 29.950 



Monthly range 85 



Wind. 



29.99, 3d, 8a;' Total movement 4519m 



iGreatest daily movement 281m, loth 



29.15, 9th. 3P Least daily movement 5ini, 19th 



30.29, 3d, 8a; ^'ean daily movement 146m 



I Mean hourly velocity 6.1m 



9.44, gth, 3P Maximum pressure per square foot, S.o lbs= 



40m per hour, 4th, 10.^^., N. 

 Maximum velocity for 5 minutes, 24m per 



hour, 4th, lo.A., N. 

 Prevailing direction. West Northvkfest. 



Air Temperature. 



In Degrees Fahr. 



Highest 86.5, 25th, 4P; 26th, 3:30P 



Lowest 29.0, nth, 5:3oA 



Mean hourly 568 



Mean of means of max. and min 56.4 



Mean sensible (wet bulb) 5o-2 



Monthly range 57 5 



Highest mean daily 71.9, 26th 



Lowest mean daily 41.0, loth 



Mean maximum 70.2 



Mean minimum 42.5 



Mean daily range 27.7 



Greatest daily range 43.0, 7th 



Least daily range 6.0, 21st 



Humidity. 



Summary. 



North Northwest 23 per cent 



i .South Southwest 16 " " 



[Northwest 13 " " 



West 10 " " 



Other directions 38 " " 



Weather. 



Mean cloudiness observed .... 30 per cent 

 Total cloudiness recorded by the .Sun 



Thermometer . . 128 hours = 28 per cent. 



Number of clear days 20 



Number of fair days ; 



Number of cloudy days 6 



Bright Sunshine. 



Mean dew point 44.3 Number hours recorded, 325 = 72 per cent. 



Mean force of vapor 47° Rain, 5th, gth, nth, 12th, 13th, 15th, 16th, 



Mean relative humidity 66.9 17th, 21st. 



Thunder and Lightning, none. 



Precipitation. In inches. 



Total precipitation, in inches 3.26 



Number of days on which .01 inch or more 

 rain fell 7 



•Temperature in ground shelter. 

 ••Reduced to freezingand sea-level. 



Frosts, nth, 24th. 



Gales, 35 or more miles per hour, 40m 4th. 



N.; 37m, 8th, S.S.W.; 37m, 9th, S.S.W.; 



36m, nth, S.S.W.; 36m, 26th, W. 



