BULLETIN No. 223. 



JULY, 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, 51 ft. Above sea level, 2^3.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



I'retaure. In inches. 



Maximum reduced to freezing, 29.89. 15th, 8 A. 

 Minimum reduced to freezing, 29.14, 26th, 2 p. 

 Reducedt maximum reading, 30.18, 15th, 8 p. 

 Keducedt minimum reading, 29.42, 26tli, 2 p. 



Mean semi-daily reduced, 29.869 



Monthly range 0.76 



*Air Temperature. In Degrees Fahr. 



Highest, 90.0, i8th, 3 p. 



Lowest, 44-0. 4th, 5:30 A. 



Mean hourly, 7°-° 



Mean of means of max. and min., .... 70.4 



Mean sensible (wet bulb), 64.1 



Monthly range 46.0 



Highest mean daily, 7S.6, i8th 



Lowest mean daily 61.7, iith 



Mean maximum, 82.0 



Mean minimum, 58.6 



Mean daily range 23.4 



Greatest daily range, 36.0, 4th, 5th 



Least daily range, 12.0,11th 



HnnildUy. 



Mean dew point, 61.0 



Mean force of vapor, 721 



Mean relative humidity, 76.4 



Precipitation. In inches. 



Total precipitation, 3.87 



Number of days on which .01 inch or more 



rain or melted snow fell 10 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4ii4ni. 



Greatest daily movement, . . . . 316 m., 27th 



Least daily movement, 43m.. 14th 



Mean daily movement, 133 ni. 



Mean hourly velocity, 5-5 ni. 



Maximum pressure per square foot, 32.5 lbs.= 

 81 m. per hour, 20th, 8 p., W. 



Maximum velocity for 5 minutes, 36 m. per 

 hour 20th, 8 p., W. 



Prevailing Direction, West Southwest. 



Summary. 



South, 16 per cent. 



West 16 " " 



Southwest, 13 " " 



West Southwest, i3 " " 



South Southwest, 10 " " 



West Northwest 10 " " 



Other directions, 22 " " 



Weather. 



Mean cloudiness observed, . . . .42 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . ... 165 hrs.=56 per cent. 



Number of clear days, 10 



Number of fair days, 18 



Number of cloudy days, 3 



Kright Sunthine. 



Number of hours recorded, . . 297 hrs.=64# 

 Rain, 2d. 6th, 7th, 9th, nth, 12th, 17th, 20th, 



22d, 24th, 26th. 



Gnleg, 35 miles or more per hour, 37 m. 6th, 

 S.; 35m. 9th, W.; Sim. 20th, W.; 35m. 

 27th, W.N.W. 



Thunder and Lightning, 6th, 7th, 9th, 

 17th, 20th, 24th, 26th. 



Hail, 7th, 20th. 



