METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



uA.3VEI3:ER,ST. 



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



Height of barometer above groimd, 51 ft. Above sea level, 2^3.^ ft. 

 Height of Wifui Instruments 72 ft. 



BULLETIN No. 165. 



SEPTEMBER, 1902. 



MONTHLY SUMMARY. 



PreBsure. In inches. 

 Maximum reduced to freezing, 30.08, 6tli, S a. 

 Minimum reduced to freezing, 29.31,9th, 8 P- 

 Reducedt maximum reading, 30.38, 6th, 8 A. 

 Reduced* minimum reading, 29.60, 9th, 8 p. 



Mean tri-daily reduced, 3o.i43 



Monthly range • 78 



*Air Temperature. In Degrees Fahr. 



Highest, 86.5, ist, 3 p. 



Lowest 35.0, 6th, 6 A. 



Mean hourly, 60.3 



Mean of means of max. and min., .... 60.9 



Mean sensible (wet bulb), 57.1 



Monthly range 5i-5 



Highest mean daily, 76.8, ist 



Lowest mean daily, 30.0, 25th 



Mean maximum, 71.6 



Mean minimum, 50.1 



Mean daily range, 21.5 



Greatest daily range, . . . 35.0, 6th, nth, i6tli 

 Least daily range, 6.5, 26th 



Huiniditi/, 



Mean dew point, 53.7 



Mean force of vapor 571 



Mean relative humidity, 79.1 



Precipitation. In inches. 



Total precipitation, 5.S3 



Number of days on which .01 inch or more 

 rain or melted snow fell, 14 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 26Som. 



Greatest daily movement, . . . . 229m., gth. 



Least daily movement gm., 28th. 



Mean daily movement S9.3 m. 



Mean hourly velocity, 3-7 m 



Maximum pressure per square foot, 4.0 lbs. = 



28 m. per hour, 9th, 9 p., N.E. 

 Prevailing Direction, North, Northwest. 

 Summary. 



North, Northeast, 17 per cent. 



East, Northeast 10 " " 



West, Southwest, 13 " " 



West, 13 " " 



Northwest, 13 " " 



North, Northwest '3 " " 



Other directions, 21 " " 



Weatfier. 

 Mean cloudiness observed, .... 57 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 224 hrs.=6o per cent. 



Number of clear days, 6 



Number of fair days, 8 



Number of cloudy days, 16 



Jiright Sunshine. 



Number of hours recorded, . . . 149 hrs.=405l 

 Rain, ist, 4th, 7th, 9th, loth, 13th, i8th, 19th, 

 2oth, 25th, 26th, 27th, 28th, 29th, 30th. 



Thunder and Lightning, 4th, t6h. 

 FroBt, 6th. 



