BULLETIN No. 314. 



FEBRUARY, 1915 



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 levels 273'5 f^- 

 Height of Wind Instruments J 2 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30 26. 19th, Sa. 

 Minimum reduced to freezing, 2S.96, 25th, 2 p. 

 Reducedt maximum reading, 30.5S, 19th, S A. 

 Reducedt minimum reading, 29.27, 25th, 2 p. 



Mean semi-daily reduced, 30.120 



Monthly range 1.31 



•Air Temperature. In Degrees Fahr. 



Higliest, 51.0, 24th, II p. 



Lowest, 2.0, 5th, 7:30 A. 



Mean hourly, 28.0 



Mean of means of max. and min 28.9 



Mean sensible (wet bulb), 25 3 



Monthly range 49 o 



Highest mean daily 42.'?, 25th 



Lowest mean daily, 10. o, 2d 



Mean maximum, 37-4 



Mean minimum, 20.3 



Mean daily range i7-i 



Greatest daily range 34o. nth 



Least daily range, 7-<i. 2d, 16th 



Humidity. 



Mean dew point, 21.2 



Mean force of vapor, 159 



Mean relative humidity, ........ 78.9 



Precipitation. In inches. 



Total precipitation, 7.02 



Number of days on which .01 inch or more 



rain fell 12 



Total snow in inches 6.5 



•Temperature in ground shelter. 

 1 Keduoed to freezing and sea-level. 



Wind. 



Total movement, 434ini. 



Greatest daily movement, .... 442ni., 26th 



Least daily movement 5m., 22d 



Mean daily movement, 155 m 



Mean hourly velocity, 6.5 m 



Maximum pressure per square foot, 9.0 lbs.= 



42m. per hour, iSth, 3 p., N. 

 Maximum velocity for 5 minutes, 27m. per 



hour, 27th, 3P., W.N.W. 

 Prevailing Direction. Northwest. 



Summary. 



North 18 percent. 



South Southwest 14 



North Northwest 14 



Northwest u 



West II 



Other directions 32 



Weather. 



Mean cloudiness observed, . . . .51 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 181 hrs.=6i per cent. 



Number of clear days, 9 



Number of fair days, 4 



Number of cloudy days, 15 



Bright Sunshine. 



Number of hours recorded, . . 115 hrs=39<. 



Bain, ist, ;th, 6th, 7th, 15th, i6th, 23d, 24th, 



25th. 



Snow, ist, 2d, 3d, 5th, 7th, Sth. 



Hail, ist, 2d- 



Days of SleiffliinR, 19. 



Gales, 3; or more miles per hour : 35m, nth, 



8.S.E.; 42m, iSth, N.;39m, 26th, W.: 41m, 



27th, VV. N. W. 



