METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51ft. Above sea level, 273.5 ft. 



Height of Wind Instruments 72 ft. 



BULLETIN No. 122. 



FEBRUARY, 1899. 



MONTHLY SUMMARY. 



yreaaiire. In inches. 

 Maximum reduced to freezing, 30.20, lUh, 9P. 

 Minimum retiuced to freezing, 28.79, 13th, "p. 

 Reducedt maximum reading, 30.53, 11th, 9p. 

 Reducedf min. reading, .... 29.12, 13th, 7p. 



Mean tri-daily reducedf, 29.983 



Monthly range, 1.41 



*Alr Temperature. In Degrees Fahr. 



Highest, 51.0, 2()th, IP 



Lowest —10.0, 15th, 8a- 



Mean hourly, 21.8 



^lean of means of max. and min., .... 21.3 



Mean sensible (wet bulb) 20.6 



Monthly Range 61.0 



Highest mean daily, 40.3, 20th 



Lowest mean daily, —0.5, 11th 



Mean maximum, 29.2 



Mean minimum 13.4 



Mean daily range 15.8 



Greatest daily range, 37.5, 15th 



Least daily i-ange 5.5, I2th 



Htimidity. 



.Mean dew point 17.0 



Mean force of vapor, 137 



Mean relative humidity 82.5 



Precipitation. In inches. 



Total precipitation, 3.56 



Number of days on which .01 inch or more 



rain or melted snow fell, 13 



Snow total in inches 21 



Snow on ground at end of mouth in inches, 1 



Wind. 



Total movement 4427 m. 



Greatest daily movement, . . . 449 m., 13th 



Least daily movement 12 m., 6th 



Mean daily movement 158 m. 



Mean hourly velocity, 6.6 m. 



Maximum pressure per square foot, 151bs = 

 55m. per hour, 13th, 7p., N. 

 Prevailing Direction, North West. 

 Summary. 



North, 36 percent. 



South, 11 " " 



North West 29 " " 



Other directions 24 per cent. 



Weatlier. 

 Mean cloudiness observed, . . 58.0 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 149 hours or 50.0 per cent. 



Number of clear days 7 



Nuniberof fair days, 10 



Number of cloudy days 11 



Bright Sunshine, 

 Number of Hours recorded, 147 hours or 50<( 

 Rain, 3d, 18th, 19th, 2l8t, 22d, 26th, 27th. 

 Sleet, .3d, 4th, 16th, 26th. 

 Snow, 1st, 3d, 4th, 5th, 7th, Sth, 12th, 13th, 

 IGth, 18th, 19th 27th. 



No. days sleighing, • 25 



Gales, of 35 or more miles per hour, 49m., 

 8th., N.W.; 47ni. ,9th, W.N.W. ; 51m., 10th, 

 W.; .Wm., 13th, N.; 45m., I4th,N.; 35m.,I9th, 

 N.W.; 36m., 23d, N.W.; 39m., 24th, N.W. ; 

 37m., 27th, W. 



• Temperature in ground shelter, 

 f Reduced to freezing and sea level. 



