BULLETIN No. 277. 



JANUARY. 1912 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 31 ft. Above sea levels 273-5 f^- 

 Height of Wi?ui Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30 25, 14th, 5 A. 

 Minimum reduced to freezing, 28.67, 9th, 7 A. 

 Reduced) maximum reading, 30.59, 14th, 5 a. 

 Keducedt minimum reading, 28.99, 9th, 7 A. 



Mean semi-daily reduced 30.023 



Monthly range 1.60 



•Air Temperature. In Degrees Fahr. 



Highest, 450. 19th, II A. 



Lowest —19.0, 14th, 8:30 A. 



Mean hourly, 14.6 



Mean of means of max. and inin 14.7 



Mean sensible (wet bulb), 11.9 



Monthly range 64.0 



Highest mean daily, 33-°. 'Sth 



Lowest mean daily — 3'7. i3'h 



Mean maximum, 23.9 



Mean minimum, 5-6 



Mean daily range 18.3 



Greatest daily range 3o-5. 14th 



Least daily range 6-5. 12th 



Hamidity. 



Mean dew point 7-8 



Mean force of vapor, 092 



Mean relative humidity, 81.3 



Precipitation. In inches. 



fotal precipitation, 2.1 



Number of days on which .01 inch or more 



rain fell, • n 



Total snow in inches i3-3 



Snow on ground at end of month 5 in 



♦ Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 4872m. 



Greatest daily movement, .... 432m., 6th 



Least daily movement, lom., 26th 



Mean daily movement 157.2 m 



Mean iiourly velocity, 6.5 m 



Maximum pressure per square foot, 19.5 lbs.= 



62m. per hour, 9th, i P., W. 

 Maximum velocity for 5 minutes, 36m. per 



hour, 9th, 3 P., W. 

 Prevailing Direction, Northwest. 



Summary. 



North 26 per cent. 



West Northwest 10 " " 



Northwest 16 " " 



South Southwest 13 " " 



South 10 " " 



North Northeast . . 10 " " 



Other directions 15 " " 



Weather. 



Mean cloudiness observed, . • • • 55 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 145 hrs. =49 per cent. 



Number of clear days 5 



Number of fair days, 16 



Number of cloudy days, 10 



Bright Sunshine. 



Number of hours recorded, . . 149 hrs. =5 1* 



Rain, 9th, 19th, 23d. 



Snow, 5th, 7th, 8th, 9th, 12th, 15th, l6th, 17th, 



22d, 27th, 29th, 30th, 31st. 

 Days Sleighing, 31. 

 Gales, 35 or more miles per hour : 39 m, 5th, 



N.N.W.; 35 m. 6th, N.W.; 62 m, 9th, W.; 



35 m, loth, W.; 39m, 19th, W.N.W. 



