

BULLETIN No. 445. 



JANUARY 1926 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGRICULTUIUL EXPEIIIMENT 



STATION. 



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



Height of barometer above ground, Sift- Aboi'e sea level, 2yj.j ft. 

 Height oj Wind Instmrnents J2 ft. Time used, y^th Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing, 30.21, 8th, 11 A 

 Minimum reduced to freezing, aq.oo, 19th, 2 a 

 Reduced ma.ximum reading, 30.53, 8th, 11 A. 

 Reduced minimum reading, 29.31, 19th, 2 .\. 



Mean semi-daily reduced 29.993 



Monthly range 1.22 



Air Tempera<iire. 



In Degrees Fahr. 



Highest 4S.0, 19th, 12 M. 



Lowest 0.0, nth, 7 A. 



Mean hourly 25.9 



Mean of means of max. and min 25.5 



Mean sensible (wet bulb) 22.8 



Monthly range 48.0 



Highest mean daily 4.09, 19th 



Lowest mean daily 7.9, 29th 



Mean maximum 33.7 



Mean minimum i7-4 



Mean daily range 16.3 



Greatest daily range 32.;, 15th 



Least daily range l-O, 5th 



Humidity. 



Mean dew point 18.6 



Mean force of vapor X41 



Mean relative humidity 79.4 



Precipitation. In inches. 



Total precipitation, in inches 323 



Total snow, in inches, 85 



Number of days on which .01 inch or more 



rain fell 10 



Days of sleighing, 11 



Wind. 



Total movement 4993m 



Greatest daily movement 425m, 7th 



Least daily movement 2Sm, 4th 



Mean daily movement 161 m 



Mean hourly velocity 6.7m 



Maximum pressure per square foot. 17.0 lbs = 



58)n per hour, 2gth, 1 a., W.N.W. 

 Maximum velocity for 5 minutes, 42m per 



hour, 29th, I A., W.N.W. 

 Prevailing direction. West Southwest. 

 Summary. 



South 26 per cent 



Northwest 22 " 



Southwest ig " 



North 10 " 



West 10 " 



Other directions 13 " 



Weather. 



Mean cloudiness observed .... 55 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 151 hours =51 percent 



Number of clear days 4 



Number of fair days iS 



Number of cloudy days 9 



Bright Sunshine. 



Number hours recorded. 146 = 49 per cent. 

 Rain. 4th, 5th, 6th, i8th, 19th, 21st, 22d, 



31st. 

 Snow. 4th, gth, 22d, 26th, 27th 28th. 

 Sleet, 31st. 

 Gales, 36m, 6th, N. W;, 47m. 7th, N. W.; 



45m, gth, N. N. E.: 57m. 22d.; N. W. 



44m, 24th, W. N. W.; ^im, 28th, 



W. N. W.; 5Sm, 29th, W. N. W. 



