BULLETIN No. 274. 



OCTOBER. 1911 



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"^^.^ ft. 

 Height of Wind Instrumefits 72 ft. 



MONTHLY SUMMARY. 



Pressui'e. In inches. 



Maximum reduced to freezing, 30.28, 25th, 8 A. 

 Minimum reduced to freezing, 29.26, 4th, 6 p. 

 Keducedt maximum reading, 30.59,25111, 8 A. 

 Reducedt minimum reading, 29-55, 4th, 6 P. 



Mean semi-daily reduced, 3o-ii5 



Monthly range 1.04 



*\\v Temperature. In Degrees Fahr. 



Highest, 72-5. 9th, 3 p.; 



i6th, 3:30 p. 



Lowest 24.0, 29th, 7 A 



Mean liourly, 48. 5 



Mean of means of max. and min., .... 49.0 



Mean sensible (wet bulb), 43.7 



Montlily range 4S.5 



Highest mean daily 57-6. 22d 



Lowest mean daily, 36.1,28th 



Mean maximum 59-9 



Mean minimum, 3S.1 



Mean daily range, 21.8 



Greatest daily range, 37-5. loth 



Least daily range, 5-5- I9th 



Humidity. 



Mean dew point, 40.1 



Mean force of vapor, 327 



Mean relative humidity, 79.0 



Precipitation. In inches. 



I'otal precipitation, 8.81 



Number of days on which .01 inch or more 

 rain fell. -12 



Wind. 



Total movement, 345ini 



Greatest daily movement, . . . . 2S8 m., 5th 



Least daily movement 46m., loth 



Mean daily movement, ni.om 



Mean hourly velocity, 4.6 m 



Maximum pressure per square foot, 6.0 lbs.= 



35m. per hour, 5th, 10 A., N.W. 

 Maximum velocity for 5 minutes, 24m. per 



hour, 24th, 9A., N.W. 

 Prevailing Direction. West Northwest. 



Summary. 



West 13 percent. 



South Southwest 13 " " 



North 16 " " 



South 10 " " 



Northwest 10 " " 



Other directions 38 " " 



Weather. 



Mean cloudiness observed, .... 59 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, ... 2i7hrs.=64 per cent. 



Number of clear days r 



Number of fair days, 14 



Number of cloudy days, 16 



Bright Sunshine. 



Number of hours recorded, . . 124 hrs.=36?( 

 Kain, 1st, 2d, 4th, 6th, 7th, nth. 17th, iSth, 

 19th, 21st, 22d, 23d, 27th, 31st. 

 Frosts, 7th, 14th, 2ith, 2Sth, 29th. 

 Gales, 35 or more miles per hour : 35 m, 5th, 

 N.W. 





Temperature in ground shelter. 

 t deduced to freezing and sea-level. 



