V 



3Hi JO AdVtidn 



BULLETIN No. 447. 



MARCH 1926 



iMeteorological Observations 



AT THK 



MASSACHUSETTS 



AGIIICULTUIUL EXPElilMENT 



STATION. 



Latitude, 42° 23' 48.5" N. Longitude 72* 31' 10" \V. 



ffeia^ht of hiirometer above ground, §1 ft. Above sea level, 27J.5 //. 

 Height oj Wind Instntments 72 ft. Time used, 7 ph Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Mnxinuim reduced to freezing, 30.27, 6th, 8 a. 

 Minimum reduced to freezing, 28.S8, 24th, 3 A. 

 Reduced maxinuim reading, 30.60. 6th, 8 A. 

 Reduced minimum reading, 29.19,24th, 3 a. 



Mean semi-daily reduced 29,932 



Montlily range 1.41 



Air Teinpernture. 



in Degrees Fahr. 



Highest 570, 22d, 5 P 



Lowest -0.5,6th, 7 A 



Mean hourly 29.4 



Mean of means of ma.x. and niin 29 4 



Mean sensible (wet bulb) 26.3 



Monthly range 57.5 



Highest mean daily 42.1, 25th 



Lowest mean daily 12.2, ;th 



Mean maximum 383 



Mean minimum 2 



Mean daily range 17S 



Greatest daily range 36.0, 6th 



Least daily range 6.0, 3d 



Humidiiy. 



Mean dew point 21.2 



Mean force of vapor 163 



Mean relative humidity 75 4 



Precipitation. In inches. 



Total precipitation, in inches 3-95 



Total snow, in inches, 



Number of days on which .01 inch or more 



rain fell " 



Days of sleighing, '9 



Wind. 



Total movement 4S84m 



Greatest daily movement 298m, 8th 



Least daily movement 40m, 22d 



Mean daily movement i57in 



Mean hourly velocity 7.5ni 



Maximum pressure per square foot, 10.0 lbs = 



45m per hour, 8th, ioa.,N.W. 

 Maximum velocity for ; minutes, 30m per 



hour, Sth, 10 A.. N.W. 

 Prevailing direction. West Northwest. 

 Summary. 



Northwest 29 per cent. 



West j6 " " 



West Northwest i3 " " 



North 13 " " 



South 10 " " 



(Jther directions '9 " " 



Weatlicr. 



Mean cloudiness observed .... 43 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 151 hours = 41 per cent 



Number of clear days 15 



Number of fair days ' 7 



Number of cloudy days 9 



Brii^ht Sunshine. 



Number hours recorded, 219 = 59 per cent. 



Rain. 2d, 7th, Sth, 20th, 23d, 25th, 31st. 

 Sleet. 31st. 



Snow. 2d, 7th, Sth, 15th, 16th, 17th, 20th 

 25th. 26st, 30th, 31st. 



Gales. 36m. 4th, W.N.W.: 40m, ;th, N.W.: 

 45m. Sth, N.W. 



