BULLETIN No. 380. 



AUGUST, 1920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGHICULTURAL EXPERIMENT 



STATION. 



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



Flei^ht of barometer above ground, ^i ft. Above sea level, 2jj.^ ft. 

 Height of lVi?id Instruments y 2 ft. Time used, y^t/iMer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing, 30.11, 19th, 8 A 

 Minimum reduced to freezing, 29.33, S'st, i p 

 Reduced maximum reading . 30.40, 19th, 8 a 

 Reduced minimum reading, 29.62,31st, ip 



Mean semi-daily reduced 30.061 



Monthly range 078 



*Air Temperature. In Degrees Fahr. 



Highest 92.0, 8th, 2:30 p 



Lowest 460. 21st, 6 a 



Mean hourly 70.2 



Mean of means of max. and min 71.8 



Mean sensible (wet bulb) 65.5 



Monthly range 45.5 



Highest mean daily 76.4. 9th 



Lowest mean daily ....... 63.3, 20th 



Mean maximum 82.6 



Mean miiumum 61.0 



Mean daily range 21.6 



Greatest daily range 35.5, 21st 



Least daily range 11. 0, 15th 



Humidity. 



Mean dew pijint 63 



Mean force of vapor 707 



Mean relative humidity 84.3 



Wind. 



Total movement 2802 m 



Greatest daily movement 243m, 23d 



Least daily movement 40m, 26th 



Mean daily movement 90m 



Mean hourly velocity 3.8m 



Maximum pressure per square foot, 6.0 lbs = 



35m per hour, 31st, ip, W. 

 Maximum velocity for 5 minutes, 36m per 



hour, 31st, IP, W. 

 Prevailing direction, South Southwest. 



Summary. 



South Southwest 39 per cent 



South 23 ■' " 



North Northeast 13 " " 



North 10 " " 



Other directions 15 " " 



Weather. 



Mean cloudiness observed .... 55 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 167 hours = 39 per cent. 



Number of clear days 4 



Number (jf fair days 22 



Number of cloudy days 5 



Bright Sunshine. 



Number hours recorded, 262 hrs, 61 = per cent. 

 Kain, ist, 2d, 7th. lotli, iith, I3tli, 14th, 

 15th, 16th, i8th, 19th, 21st, 29th, 30th, 31st. 

 ith, 13th, 



Precipitation. In inches. 



Total precipitation, in inches 3 62!Thnnder and Li^htninii, loth, 



Number of days on which .01 inch or more 30th, 31st. 



rain fell is'oales, 35m, 31st, W 



•Temperature in ground slielter. 



••Reduced to freezing and sea-level. 



