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Expt' ■ ■"• 



Unlvanity of Nabu :l<a. 



LINCOLN, NtEFA- 



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U. S. A. 



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METE0R0L0G115AL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



^^IvIiiEI^ST. 



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



Height of barometer above ground, 51 ft. Above sea level, 2^3.^ ft. 



Height of Wind Instruments 72 ft. 



BULLETIN No. 156. 



DECEMBER, 1901 



MONTHLY SUMMARY. 



Press irt'e. In inches. 

 Maximum reduced to freezing, 30.24, 7tli, 7 A. 

 Minimum reduced to freezing, 29.11, 29th, 2 p- 

 Reducedt maximum reading, 30.58, 7tli, 7 A. 

 Reduced! minimum reading, 29.42, 29th, 2 P. 



Mean tri-daily reduced, 30.029 



Monthly range, . . . . • 1.13 



*Air Temperature. In Degrees Fahr. 



Highest, 60.0, 14th, 2 p., 15th, 7 A. 



Lowest, -10.5, 7th, 7:30 a. 



Mean hourly, 26.4 



Mean of means of max. and min., .... 26.7 



Mean sensible (wet bulb), 24.9 



Monthly range 70.5 



Highest mean daily 53.0, 14th 



Lowest mean daily 6.2, 7th. 



Mean maximum, 36.3 



Mean minimum, 17.1 



Mean daily range, 19.2 



Greatest daily range, 42.0,15th. 



Least daily range, 6.5, 17th. 



Hntnidity . 



Mean dew point, 17.9 



Mean force of vapor 171 



Mean relative humidity, 69.8 



Precipitation. In inches. 



Total precipitation, . • 7.77 



Number of days on which .01 inch or more 



rain or melted snow fell, 16 



Snow, total in inches, 25.5 



Snow on ground at end of month, .... 2.0 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4280m. 



Greatest daily movement, .... 520 m., 15th. 



Least daily movement, 3 m., 19th. 



Mean daily movement 138.1 m. 



Mean hourly velocity, ; 5.8 m. 



Maximum pressure per square foot, 14.5 lhs.= 



54 m. per hour, 15th, 3 A., S.W. 

 Prevailing Direction, Northeast. 

 Summary. 



Northeast, 19 per cent. 



Southwest, 10 " " 



East Northeast 19 " " 



Other directions 52 " " 



Weather. 



Mean cloudiness observed, . . . . 65 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, 176 hrs.=62 per cent. 



Number of clear days, 4 



Number of fair days, 9 



Number of cloudy days, 18 



Bright Sunshine. 



Number of hours recorded, . . . 107 hrs.=38)l 



Rain, 9th, loth, 13th, 15th, 24th, 25th, 28th, 

 29th, 30th. 



Snow, 3d, 4th, 15th, 17th, 19th, 20th, 23d, 

 24th, 25th, 26th, 27th. 



Oales, 35 miles or more per hour, 45ni., 

 lotb, N.W.; 50m., 14th, S.W.; 54m., 15th, 

 S.W.; 35m., i6th, N.E.;36m., 22d, W.S.W.; 

 51m., 31st, N.W. 



No. days sleighing n 



