BULLETIN No. 242. 



FEBRUARY, 1909. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

 Height of Wind Instniments 72 ft. 



MONTHLY SUMMARY. 



Freasure. hi inches. 



Maxiimiiii reduced to freezing, 30 21, i4tli, ioa, 

 Minimum reduced to freezing, 28.60, 20th, 6a 

 Reducedt maximum reading, 30.53, 14th, 10 A- 

 Reducedt minimum reading, 28.Q0, 20th, 6 A 



Mean semi-daily reduced 29.95S 



Monthly range, 1-63 



*.4.ir Teiuperatiire. In Degrees Fahr. 



Highest 54-5. 6th, if 



Lowest —3.0,4th, 7 A 



Mean hourly, 28.1 



Mean of means of max:, and niin 29.3 



Mean sensible (wet bulb), 24.9 



Montlily range, 57-5 



Highest mean daily 4i-9. 20th 



Lowest mean daily, 7-5' ist 



Mean maximum, 38.6 



Mean minimum, 20.2 



Mean daily range, 18.4 



Greatest daily range 33.0, loth 



r^east daily range 3.;, 24th 



Hnmidlt!/. 



Mean dew point 21.0 



Mean force of vapor, 15.5 



Mean relative humidity, 78. 9 



Precipitntion. In inches. 



Total precipitation, 5.16 



Number of days on which .01 inch or more 



rain or melted snow fell, • 10 



Total snow in Indies 5.0 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5585m 



Greatest daily movement, . . . 53Sni., 25th. 



Least daily movement, 6im., 22d. 



Mean daily movement 199 ni. 



Mean hourly velocity, 7.1m. 



Maximum pressure per square foot, 1S.5 lbs.= 



61 m. per hour, 25th, Sa., N. 

 Maximum velocity for 5 minutes, 36m. per 



hour 25th, .8a, N. 

 Prevailing Direction, Northwest. 

 Summary. 



West Northwest 18 percent 



North 14 " " 



Northwest 14 " " 



West Southwest 14 " " 



West Northwest 11 " " 



South II " 



Other directions, 18 " " 



Ifentfier. 

 Mean cloudiness observed, .... 60 per cent 

 Total cloudiness recorded by the Sun Ther- 

 mometer, .... i39hrs.= 47per cent. 



Number of clear days 10 



Number of fair days, 8 



Number of cloudy days, 10 



Rriglit Sunshine. 

 Number of hours recorded. . . 157 hrs. = 53^0 

 Rain, 5th, 9th, loth, 16th, 19th, 20th, 23d, 



24th. 

 Thunder and Lighlnins:, none. 

 Snow, 9th, lotli, nth, 14th, 15th, i6th, 23d, 

 27th. 



Days Sleighing 13 



Onles, 3^ miles or more per honr ; 35m., 

 ist.. N.N.W.: ^4111., 6th. S.: •^,:;m., Sth, 

 W.N. W.; 39m.. loth., W. N. W.: 3:5111.. 

 nth. W.S.W. : 35111, i7tli, W., 48111. 2otli. 

 N.N.W.: 35m, 2ist, X.: 6im, 25tli. N. 



