BULLETIN No. 297. 



SEPTEMBER, 1913 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above grou/id, 31 ft. Above sea level, ^73-5 fi- 

 Height of Wind Instrume?its 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxuuuni reduced to freezing, 30 28, i6th, 8 A. 

 Mini]nuni reduced to freezing, 29.46, 13th, 4A. 

 Reduced) nia.\iuiuni reading, 30.58, i6th, 8 A. 

 Reducedt minimum reading, 29.75, 13th, 4 a. 



Mean semi-daily reduced, 3o-i34 



Montlily range, 0.83 



*Air Temperature. In Degrees Fahr. 



Highest 87.5, 2d, 2:30?. 



Lowest 31.0, 15th, 6 A. 



Mean iiourly, 59-7 



Mean of means of max. and min., .... 60.0 



Mean sensible (wet bulb), 54 2 



Monthly range, 565 



Highest mean daily, 73-8, 3d 



Lowest mean daily, 480, 15th 



Mean ma.ximum 7i-7 



Mean minimum, 4S.3 



Mean daily range, 23.4 



Greatest daily range 42.5, i6th 



Least daily range 5-o, 19th 



Humidity. 



Mean dew point S'o 



Mean force of vapor, 493 



Mean relative humidity, ....... .80.2 



Precipitation. In inches. 



Wind. 



Total movement, 3220m. 



Greatest daily movement, .... 293ni., 22d 



Least daily movement gni., 5th 



Mean daily movement, 107 m 



Mean hourly velocity, 4-5 ni 



Maximum pressure per square foot, 6.5 lbs.= 



36ni. per hour, 22d, 5 A., S. 

 Maximum velocity for 5 minutes, 24m. per 



hour, 13th, IP., W.N.W. 

 Prevailing Direction, Northwest. 



Summary. 



South 27 per cent. 



North 17 " " 



North Northeast 10 " " 



North Northwest 10 " " 



Other directions 38 " " 



Weather. 



Mean cloudiness observed, . . . .47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i9ihrs.=5i percent. 



Number of clear days, 8 



Number of fair days, 10 



Number of cloudy days, 12 



Bright Sunshine. 



Number of hours recorded, . . 182 hrs=49*. 



Rain, 2d, 4th, 5th, 7th, Sth, 13th, 17th, iSth, 



19th, 20th, 2ISt, 22d. 



Thunder and Liglitning, none. 



Total precipitation 2.56 Frosts, loth, nth, 15th, i6th, 2Sth. 



Number of days on which .01 inch or more Gales, 35 or more miles per hour : 35m, 9th, 



rain fell • "IN.: 36in, 22d, S. 



♦Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



