BULLETIN No. 279. 



MARCH, 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, 51 ft. Above sea level, 2yj._^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 3037, 6th, 1 A 

 Minimum reduced to freezing. 28.96, 29th, 2 P. 

 Keducedt maximum reading, 30.70, 6tli, i A. 

 Reduced ^minimum reading, 29.27, 29th, 2 p. 



Mean semi-daily reduced, 3o-i2S 



Monthly range, i-43 



*Air Temperature. In Degrees Fahr. 



Higliest, 60.5. 3'st, 2 p. 



Lowest, i.o,6th, 7A. 



Mean hourly, 3o-5 



Mean of means of max. and min., .... 30.9 



Mean sensible (wet bulb), 27.6 



Monthly range 59-5 



Highest mean daily 44 o. 'Sth 



Lowest mean daily, 15.S, 3d, 4th 



Mean maximum, 40-5 



Mean minimum, 21.3 



Mean daily range, i9-2 



Greatest daily range 35-°, 3ist 



Least daily range 5-°, 12th 



Humidity. 



Mean dew point, 23.4 



Mean force of vapor i73 



Mean relative humidity, 80.3 



Precipitation. In inches. 



Total precipitation, 5-7o 



Number of days on which .01 inch or more 



rain fell, * ° 



Total snow in inches 12 



♦Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



I'otal movement, 5291 m. 



Greatest daily movement, .... 412m., loth 



Least daily movement, i9iii., 2Sth 



Mean daily movement 170.0 m 



Mean hourly velocity, 7.1 m 



Maxinmm pressure per square foot, 6.0 lbs.= 



35m. per hour, 25th, 4 A., N. 

 Maximum velocity for 5 minutes, 22 m. per 



hour, 25th, II A., N. N. E. 

 Prevailing Direction. Northwest. 



Summary. 



Northwest 19 per cent. 



North 19 " " 



South .Southwest 13 " " 



West 13 " " 



North Northeast 10 " " 



North Northwest 10 " " 



Other directions 26 " " 



Weatlier. 



Mean cloudiness observed, . . . . 53 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 147 hrs.=40 per cent. 



Number of clear days, I3 



Number of fair days, 10 



Number of cloudy days 8 



Briglit Sunshine. 



Number of hours recorded, . . 224 hrs.=6o# 



Kain, Sth, 12th, 13th, 21st, 24th, 28th, 29th, 



31st. 



S^ow, 5th. 6th, Sth, 9th, 12th, 13th, 21st, 24th, 



26th. 



Days Sleigliing, 3. 



Gales, 35 or more miles per hour : 3Sm, 25th, 

 N. 



