BULLETIN No. 3 15, 



MARCH. 1915 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 31 ft. Above sea level, 2jj.^ ft. 

 Height oj Wind Instruments "J 2 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30 02, 5th, 8 A. 

 Minimum reduced to freezing. 29.21, 21st, 2 p. 

 Reducedf maximum reading, 30.37, 5th, 8 A. 

 Keducedt minimum reading, 29.52, 21st, 2 p. 



Mean semi-daily reduced, 29.832 



Monthly range, 0-85 



•Air Temperature. In Degrees Fahr. 



Highest 57-5. 25th, 4 P- 



Lowest 13-0. 3d, 12 P. 



Mean hourly, 32-o 



Mean of means of max. and min 32.8 



Mean sensible (wet bulb), 273 



Monthly range 44 5 



Highest mean daily 4'?-8, 25th 



Lowest mean daily, i9-5i3d 



Mean maximum, 43-o 



Mean minimum, 22.6 



Mean daily range 20.3 



Greatest daily range, 3i-o. 4th 



Least daily range, 12.0, 7th 



Humidity. 



Mean dew point, 20.0 



Mean force of vapor, i75 



Mean relative humidity, 65.4 



Precipitation. In inches. 



Total precipitation 0.12 



Number of days on which .01 inch or more 



rain fell 3 



Total snow in inches 0.5 



♦Temperature in ground shelter. 

 1 Reduced to freezing and sea-level. 



Wind. 



Total movement, 6S64m. 



Greatest daily movement, .... 5S5ni., 3d 



Least daily movement, 63m., 23d 



Mean daily movement, 221m. 



Mean hourly velocity 9.2 m. 



Maximum pressure per square foot, 16.0 lbs.= 



57m. per hour, 26th, 12M., W. 

 Ma.ximum velocity for 5 minutes, 36m. per 



hour, 26th, I2M., W. 

 Prevailing Direction, Northwest. 



Summary. 



Northwest 32 per cent. 



North Northwest 23 " " 



West Northwest 19 " 



West 19 " " 



Other directions 7 " " 



Weather. 



Mean cloudiness observed 27 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, 8[ hrs. = 22 per cent. 



Number of clear days, 17 



Number of fair days, 13 



Number of cloudy days i 



Briglit Sunshine. 



Number of hours recorded, . .290 hrs=7S^. 



Rain, 21st, 22d, 25th. 



Snow, 2d, 22d, 23d, 26th, 29th, 30th. 



Gales, 35 or more miles per hour : 35m., ist, 

 W.N W.; 40m., 2d, W.N.W.; 40m , 3d, 

 W.N.W.; 37m., 4th, N.N.W.; 36m., loth, 

 W.N.W.; 35m., jith, N.W.; 39m., T4th, 

 N.N.W.; 39m., 15th, W.N.W.; 57m , 26th, 

 W.; 44m. ,27th, N.W.; 36m., 29th, W.N. W.; 

 41m., 30th, W.N. W. 



