METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE 



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



Height of barometer above ground, 31 ft. Above sea level, 2'jj.3 ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 134, 



FEBRUARY, 1900. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.42,28111, 7 A. 

 Minimum reduced to freezing, 28.55, 25th, 4 A. 

 Reducedt maximum reading, 30.75, 2Sth, 7 a 

 Reducedt minimum reading, 28.86, 25tli, 4 a. 



Mean tri-daily reduced, 29.967 



Montlily range, . . . . • 1.89 



*Air Temperature. In Degrees Falir. 



HigViest, 56.0, 13th, I P. 



Lowest, -8.0, 3d, 6:30 A. 



Mean hourly, 24.6 



Mean of means of max. and min., .... 24.6 



Mean sensible (wet bulb), 22.8 



Monthly range, 64.0 



Highest mean daily 43-5, 13th 



Lowest mean daily, 3.4, 2d 



Mean maximum, 33.5 



Mean minimum 15.9 



Mean daily range 17.4 



Greatest daily range, 36.0, 25th 



Least daily range, 3.0,8th 



Ifuitiiditi/. 



Mean dew point, 17.8 



Mean force of vapor, 147 



Mean relative humidity, . . . • ... .77.4 

 Precipitation. In inches. 



Total precipitation, . ■ 8.12 



Number of days on which .01 inch or more 



rain or melted snow fell 13.0 



Snow total in inches, 6.5 



Snow on ground at end of month, . . i inch 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5ot6 m. 



Greatest daily movement, .... 435 m., 26th 



Least daily movement, 2 m., 4th 



Mean daily movement i79.o ™- 



Mean hourly velocity, 7-5 m- 



.Maximum pressure per square foot, 30.5 Ibs.^ 



78 m. per hour, 25th, 11:00 p., \V.N.\V. 

 Prevailing Direction, West North West. 

 Summary. 



North, II per cent. 



Northwest, 21 " " 



Northeast, 11 " " 



Southwest, II " " 



South Southwest, 14 " " 



Other directions, 32 " " 



Weather. 



Mean cloudiness observed, .... 62 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, 175 hrs.= 59per cent. 



Number of clear days, 7 



Number of fair days, S 



Number of cloudy days, 13 



Rright Sunshine. 



Number of hours recorded, . . . 120 hrs.=4i5l 



KaiH, 4th, 5th. 8th, 9th, 12th, 13th, 17th, 

 i8th, 22d, 23d, 24th, 25th. 



SnoM'.4th, 5th, 6th, nth, 15th, 17th, iSth, 23d, 

 25th, 2Sth. 



Thtmder and Liffhtning, 24th. 



Gales, 35 miles or more per hour, 44m., ist, 

 W.; 53m., 5th, N.; 55m., 13th. N.W.; 

 50m., 14th, N.W.; 45ni.. 15th, N.W.; 42 ni.,i 

 i8th, N.; 37m. ,19th, N.W.; 52m., 22d, N.E.; 

 78m., 25th, W.N.W.; 51m., 26th, N.W. 



No. days sleighing, 12 



