LlBHAHY 0} IHL 

 Massachiisrits Agricultural (-olieije, 



AMHERST, MASS. 



BULLETIN No. 4 15. 



Meteorolopical Observations 



JULY. 1923 



MASSACHUSETTS 



AGTITCULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 31 ft. Above sea level, 2yj.j ft. 

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



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing, 30.11, 2nd 8a 

 Minimum reduced to freezing, 29.38, 25th. 4P. 

 Reduced maximum reading, 30.40, 2d 8a. 

 Reduced mininuim reading, 29.67, 25tli,4P 



Mean semi-daily reduced 30.001 



Monthly range 0.73 



Air Temperature. 



In Degrees Fahr. 



Highest 94.0,20th, 3P 



Lowest 43.5, 24th, 5A 



Mean hourly 68.4 



Mean of means of max. and min 68.5 



Mean sensible (wet bulb) 62.1 



Monthly range 50.5 



Highest mean daily 77.6,21th 



Lowest mean daily bi.S, 31st 



Mean maximum 81.0 



Mean mininuim 55,9 



Mean daily range 25.1 



Greatest daily range 39.5,20th 



Least daily range 5-5, 3rd 



Hnmidity. 



Mean dew point 58.4 



Mean force of vapor 672 



Mean relative humidity 75.2 



Precipitation. In inches. 



Total precipitation, in inches 1.77 



Number of days on which .01 inch or more 

 rain fell 9 



Wind, 



Total movement 2852m 



Greatest daily movement i58ni, 26th 



Least daily movement 24m, i8th 



Mean daily movement 92m 



Mean hourly velocity 3.8m 



Maximum pressure per square foot, 7.0 lbs = 



J7m per hour, 27th, 6 p., W. 

 Maximum velocity for 5 minutes, i8m per 



hour, 27th, 6 p., W. 

 Prevailing direction. West Northwest. 



Summary. 



North Northwest 16 percent 



South Southwest 13 " " 



West 13 " " 



Northweast 10 " '* 



South 10 " '' 



Other directions 38 " '' 



Weather. 



Mean cloudiness observed .... 42 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 104 hours = 23 per cent. 



Number of clear days 22 



Number of fair days 5 



Number of cloudy days 4 



Briiiht Sunshine. 



Number hours recorded, 358 = 77 per cent. 

 Kain, 3d, 4th, 6th, 14th, 15th, i6th, 24th, 



25th, 27th, 2Sth, 29th, 31st. 

 Thunder and Liiihtnin^, 14th. 15th, 



Gales, 35 or more miles per hour, 37m 27th 

 W. 



