BULLETIN No. 230, 



FEBRUARY, 1908. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of ha I'o meter above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments ^2 ft. 



MONTHLY SUMMARY. 



freasnre. In inches. 



Maxiniuni'ieduced to freezing, 30.49,9th, Sa 

 Mininiiun reduced to freezing. 28.63, ist, 4 p. 

 Reduced^ maximum reading, 30.83, 9th, 8 \ 

 Reducedt minimum reading, 28.94, ist, 4 P 



Mean semi-daily reduced, 30.082 



Montlily range, 1.89 



* Air Vetnperature. In Degrees Fahr. 



Highest, ?6.o, 15th, 3 P 



Lowest -12.0,5th, 7 A. 



Mean hourly, 20.5 



Mean of means of max. and min., .... 20.6 



Mean sensible (wet bulb), 17.7 



Monthly range, 68.0 



Highest mean daily 46.5,15th 



Lowest mean daily 0.3, jth 



Mean maximum, 30.4 



Mean minimum, 10.8 



Mean daily range, 19.6 



Greatest daily range, 42.0, 25th 



Least daily range, 8.5, 13th, 19th 



Uutnidity, 



Mean dew point, 14.7 



Mean force of vapor 116 



Mean relative humidity, 84.8 



JPrecipitation. In inches. 



Total precipitation, 3.53 



Number of days on which .01 inch or more 



rain or melted snow fell, . . g 



Total snow, in inches, 20 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 55iini. 



Greatest daily movement, .... 594 m., 2nd 



Least daily movement, 41m., 25th 



Mean daily movement 190 m. 



Mean hourly velocity, 7-9 ni 



Maximum pressure per square foot, 23.0 lbs.= 



68 m. per hour, 2nd, 12M., N. W. 

 Maximum velocity for 5 minutes, 42 m. per 



hour 2nd, I2M., N. W. 

 Prevailing Direction, Northwest. 

 Summary. 



North, 17 per cent. 



Southwest, . . .■ 17 " " 



North Northwest • 17 " " 



Southeast 10 " " 



Other directions, 39 " " 



Weather. 

 Mean cloudiness observed, . . . .42 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, io6hrs.=35 per cent. 



Number of clear days, 15 



Number of fair days, 8 



Number of cloudy days, 6 



Bright Sunshine, 

 Number of hours recorded, . . 200 lirs.=65* 

 Rain, ist, 6th, 13th, 14th, 15th, 19th, 26th 

 Snow, ist, 2nd, 5th, 6th, igth, 23d, 26th 

 Sleet, ist, 26th. 

 Days Sleighing, 19 



Gales, 35 miles or more per hour., 68 m , 

 2nd, N. W.; 38 m., 4th, N. N. W.; 51 m., 

 7th, N. N.W.;4om.,Sth, N. N. W.; 47 m., 

 15th, S. W.; 



