BULLETIN No. 2 18. 



FEBRUARY, 1907. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION . 



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



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

 Height of IVind Instruments 72 ft. 



MONTHLY SUMMARY. 



yrenmire. In inches. 



Maximum reduced to freezing. 30.44. 24th, i a. 

 Minimum reduced to freezing, 29.20, 3d, i a. 

 Reducedt maximum reading, 30.78, 24th, i a. 

 Reducedt minimum reading, . . 29.51, 3d, i p. 



Mean semi-daily reduced 30.094 



Montlily range, 1.27 



*Air Temperature. In Degrees Fahr. 



Highest 43.0. 14th, 3 P. 



Lowest —18.5. -th, 7:00 A, 



Mean hourly, '6-5 



Mean of means of max. and mm 16.1 



Mean sensible (wet bulb). i3-2 



Monthly range 61.5 



Highest mean daily, 34.1.14th 



Lowest mean daily, 1-5, 23d 



.Mean maximum 26.6 



Mean minimum, ...... .... 5.6 



.Mean daily range 21.0 



Greatest daily range, 42.0. "th, 



Least daily range, 5-0' jt'i 



JTiiniiditif. 



.Mean dew point 90 



Mean force of vapor 096 



Mean relative humidity 80.2 



Precipitation. In inches. 



Total precipitation, 1.92 



Number of days on which .01 inch or more 

 rain or melted snow fell, ..... . . 10 



Total snow in inches 1S.5 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5272 ni. 



Greatest daily movement, 529 m., 3d 



Least daily movement 30m., 7th 



Mean daily movement, 188 m. 



Mean hourly velocity, 7 8 m. 



Maximum pressure per square foot, 20.0 lbs.= 



63 m. perhour, 3d, 7 a., N.N.W. 

 Maximum velocity for 5 minutes, 40 m. per 



hour 3d, 3 p., N.N.W. 

 Prevailing Direction, North, Northwest. 



Summary. 



North, Northwest, 25 percent. 



Northeast, 25 " " 



Southwest, iS " '■ 



Northwest n " " 



Other directions 21 "' " 



Weather. 



Mean cloudiness observed, . ... 41 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 96hrs.=32 per cent. 



Number of clear days, 14 



Number of fair days 10 



Number of cloudy days, 4 



Kright Sunithine, 



Number of hours recorded, . . 200 hrs. = 68jt 



Jiain, 1st. 3d. 14th. 19th, 



Snow, ist. 4th. 5th. 8th, 9th. i6th. I9tli.20th. 



24th, 25th. 

 Tttiya Sleiffhing 2S. 



Galea, 3:; miles or more per hour, 63 m. 3d, 

 N.N.W.; 37 m. 5th, N.E. ; 39 m. nth, N. 

 W. ; 3; m."i4th. N.N.W. ; 37 m. iSth. N.N. 

 E.; 37 m. 2ist. N.W.: 48 m. 25th, N.N.W.; 

 39 m. 27tli, N.E. 



