BULLETIN No. 26 1. 



SEPTEMBER, 1910 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 fi- Above sea level, 2"/;^.^ ft. 

 Height of Wind Instrutnents 72 ft. 



MONTHLY 



treasure. In inches. 



Maximum reduced to freezing, 30 05, i6th,io a- 

 Minimum reduced to freezing, 29.49, gtli, 12 m. 

 Reducedf maximum reading, 30.34, i6tli, 10 a. 

 Reducedt minimum reading, . 29.77, 9th, 12 M 



Mean semi-daily reduced, 30.100 



Montlily range 0.57 



* A.ir Temperature. In Degrees Fahr. 



Higliest, 82.0, i3th,4 p. 



Lowest, 34-0. 23d, 7 A. 



Mean iiourly, 61. i 



Mean of means of max. and min., .... 61.7 



Mean sensible (wet bulb), 55-6 



Monthly range, 4S.0 



Higliest mean daily 71.4,5th 



Lowest mean daily, 52;4. 23d 



Mean maximum, . . . . : 73.4 



Mean minimum, .... 50.1 



Mean daily range, 23.3 



Greatest daily range, 36.5. 18th 



Least daily range, 6.5, ist 



Uiiinidity. 



Mean dew point 53-5 



Msan force of vapor 510 



Mean relative humidity, 82.7 



Precipitation. In inches. 



Total precipitation, 2.86 



Number of days on which .01 inch or more 



rain fell, • n 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



SUMMARY. 



Wind. 



Total movement, 3336ni. 



Greatest daily movement, . . . .204m., 14th. 



Least daily movement, 3Sni., 27th. 



Mean daily movement, iii.2ni. 



Mean hourly velocity, 4-7 m- 



Maximum pressure per square foot, 2.5 lbs.= 



22m. per hour, 6th, 5?., S. S. E. 

 Maximum velocity for 5 minutes, iSm. per 



hour 23d, 3P., S.S.W. 

 Prevailing Direction, West Southwest. 

 Summary. 



North Northeast 13 per cent. 



North 13 " " 



North Northwest 10 " " 



South Southwest 20 " " 



West Southwest 13 " " 



South Southeast 10 " " 



Other directions 21 " " 



Weather. 



Mean cloudiness observed, .... 5; per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, i28hrs.=34 per cent. 



Number of clear days, 14 



Number of fair days, 9 



Number of cloudy days, 7 



Jtright Sunshine, 



Number of hours recorded, . . 245 lirs.=66^ 



Rain, ist, 2d, 3d, 4th, 5th, 6th, 9th, 13th, 14th, 

 21st, 24th, 25th, 27th, 2Sth. 



Galea, 35 or more miles per hour : None. 



Thunder and Lrightning, 5th, 6th, 13th. 



Light Frost, 23d. 



