BULLETIN No. 286. 



OCTOBER, 1912 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGEICULTURAL 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 Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxunum reduced to freezing, 30.15,21st, 9 a. 

 Miniiniiin reduced to freezing, 29.30, 7th, 4 P. 

 Reducedt maxinuun leading, 30.46, 21st, 9 a. 

 Reduced! minimum reading, 29.59, 7th, 4P. 



Mean semi-daily reduced, 30.056 



Monthly range, 0.S7 



*Air Temperature. In Degrees Fahr. 



Highest, 83.0, 6th, 3 p. 



Lowest, 26.5, 16th, 6 A. 



Mean hourly, 52.4 



Mean of means of max. and uiin 53.3 



Mean sensible (wet bulb), 45 8 



Monthly range, 5^5 



Highest mean daily, 61.9,4th 



Lowest mean daily, 41. S, i6tli 



Mean maximum, 65.7 



Mean minimum, 40.8 



Mean daily range, 24.9 



Greatest daily range, .45.5,17th 



[-east daily range 4-5>25th 



Humidity. 



Mean dew point ^\■^ 



Mean force of vapor, 369 



Mean relative humidity, 74-9 



Precipitation. In inches. 



Fotal precipitation, 2.07 



M umber of days on which .01 inch or more 

 rain fell, • 7 



•Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3953ni. 



Greatest daily movement, .... 241m., 15th 



Least daily movement 28m., 5th 



Mean daily movement 128.0 m 



Mean hourly velocity, 5-3 ni 



Maximum pressure per square foot, 5.0 lbs.= 



32in. per hour, 15th, 12 M., W.N.W. 

 Maxinmm velocity for 5 minutes, 27 m. per 



hour, 15th, 12 M., W.N.W. 

 Prevailing Direction, West. 



Summary. 



South 19 per cent 



Northwest 16 " " 



West Southwest 13 " " 



West Northwest 13 " " 



Otlier directions 39 " " 



Weather. 



Mean cloudiness observed, .... 40 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, I78hrs.=52 per cent. 



Number of clear days, 6 



Number of fair days, 14 



Number of cloudy days, 11 



Bright Sunshine. 



Number of hours recorded, . . 163 hrs. =48^1 



Kain, ist, 9th, loth, nth, 12th, 19th, 23d, 24th, 



25th. 



Frosts, 2d, 3d, 9th, i6th, 17th, 28th, 29th. 



Gales, 35 or more miles per hour : None. 



