BULLETIN No. 226. 



OCTOBER, 1907. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, ^i ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Freaaiire, In inches. 



Maxuniun reduced to freezing, 30.30. 31st, 11 A 

 Miiiimuin reduced to freezing, 29.07, 8th, 7 A. 

 Reduced! maximum reading, 30.60, 31st, 11 a. 

 Reducedt minimum reading, 29.36, 8th, 7 A. 



Mean semi-daily reduced, . 30.051 



Monthly range 1.24 



*Alr Temperature. In Degrees Fahr. 



Highest, 73-0, 4th, 31" 



Lowest, 20.5, 27th, 6 A 



Mean hourly, 45-6 



Mean of means of max. and min., .... 45.7 



Mean sensible (wet bulb), 410 



Monthly range 52.5 



Highest mean daily 59.1,7th 



Lowest mean daily, 34.6, 21st 



Mean maximum, 58.6 



Mean minimum, 33.5 



Mean daily range, 25.1 



Greatest daily range, 38.5, i6th 



Least daily range, 5.0, 2Sth 



Hnnilditij. 



Mean dew point 3J.i 



Mean force of vapor 302 



Mean relative humidity, 77.7 



Precipitation. In inches. 



Total precipitation, 5.00 



Number of days on which .01 inch or more 



rain or melted snow fell, . 7 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 5iiini. 



Greatest daily movement, . . . . 460 m. ,8th 



Least daily movement 51m., 2d 



Mean daily movement, 165 m. 



Mean hourly velocity, 6.9 m. 



Maximum pressure per square foot, g.olbs.= 



42 m. per hour, Sth, 6 A., S. 

 Maximum velocity for 5 minutes, 36 m. per 



hour Sth, 6 A., S. 

 Prevailing Direction, West Southwest. 



Summary. 



South 13 per cent. 



Northwest ' 16 " 



South Southeast, 23 " " 



West 19 " " ■ 



Other directions 29 " " 



Weat?ier. 



Mean cloudiness observed, . . . .30 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, ... i64hrs.=48 per cent. 



Number of clear days, 8 



Number of fair days, 11 



Number of cloudy days, 12 



Bright Sunshine. 



Number of hours recorded, . . 177 hrs. = 52?t 



Rain, 4th, 7th, 8th, nth, 20th, 27th, 2Sth, 

 29th. 



Oales, 42miles,8th. S. 



Thunder and Lightning , 8th. 



Frost, 2d. 6th. 9th, loth, 13th, 14th, 15th, i6th, 



17th, 19th, 2ISt, 22d, 25th, 26th, 27th, 31st. 



