BULLETIN No. 290. 



FEBRUARY. 1913 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of haro'neter above ground, 5^ fi- Above sea level, 2"/^.^ ft. 

 Height of Wind Instruments "J 2 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.11, 2d, iiA.; 



loth, II A. 

 Minimum reduced to freezing, 29,25, 23d, i A. 

 Reducedf maximum leading, 30.44, loth, 11 A.; 

 Reducedt minimum reading, 29.56, 23d, 1 a. 



.Mean semi-daily reduced, 30.008 



Montlity range 0.88 



•Air Temperature. In Degrees Fahr. 



Highest, 55.0, 2ist, 3 P. 



Lowest 4-5. loth, 7:30 A 



Mean hourly, 22.7 



Mean of means of max. and niin., .... 22.7 



Mean sensible (wet bulb), i9-4 



Monthly range, 59-5 



Highest mean daily, 4i-5i 21st 



Lowest mean daily, 7-ii loth 



Mean maximum, 3*-2 



Mean minimum, i3-3 



Mean daily range, 18.9 



Greatest daily range, 34.5,11th 



Least daily range 7-5. 22d 



Humidity. 



Mean dew point, .... 

 Mean force of vapor, . . 

 Mean relative humidity. 



14.1 

 .125 



74.5 



Precipitation. In inches. 



Total precipitation, 2.94 



Number of days on which .01 inch or more 



rain felU • ' 7 



Total snow in inches n-o 



♦Temperature in ground shelter. 

 Reduced to freezing and sea-level. 



Wind. 



Total movement, 5194m. 



Greatest daily movement, .... 445ni., ist 



Least daily movement 23m., nth 



Mean daily movement 185 ni 



Mean hourly velocity, 7-7 m 



Maximum pressure per square foot, 13.5 Ibs.= 



52m. per hour, ist, ip., W.N.W. 

 Maximum velocity for 5 minutes, 36 m. per 



hour, ist, 3 P., W.N.W. 

 Prevailing Direction, West. 



Summary. 



West 18 per cent, 



West Northwest 18 " " 



Northwest 18 " " 



Southwest 14 " " 



South II " " 



Other directions 21 " " 



Weather. 



Mean cloudiness observed, . • . .42 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 91 hrs.=3i per cent. 



Number of clear days, 13 



Number of fair days, 11 



Number of cloudy days, 4 



Bright Sunshine. 



Number of hours recorded, . . 205 hrs=69<. 



Bain, 21st, 22d, 27th, 28th. 



Snow, ist, 3d, 8th, nth, i6th, 17th, 23d, 26th, 



27th. 



Thunder and Lightning:, 22d. 



Days of Sleighing, 15. 



Gales, 35 or more miles per hour : 52 m, ist, 



W.N.W.; 39m, 8th, W.S.W.; 36m., 9th, W.; 



50m. i2th, W.N. W., 36 m.. 23d, W.S.W. 



