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BULLETIN No. 459. 



MARCH, 1927 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGllICULTUKAL EXPEIIIMENT 



STATION. 



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



Height of hiiromeler above ground, 51 ft. Above sea level, 2yj.j ft. 

 Height oj Wind Instruments y 2 ft. Time used, j^thMer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing, 30.18, 12th, 8 a 

 Minimum reduced to freezing, 29.09, 8th, 11 a. 

 Reduced maximum reading, 30.49, 12th, 8 A 

 Reduced minimum reading, 29.40, Sth, 11 A 



Mean semi-daily reduced 30-io3 



Monthly range 1.09 



Air Temperature. 



In Degrees Fahr. 



Highest 74-0. •7th, 4 P 



Lowest 6.0, 2d, 6 A 



Mean hourly 37-7 



Mean of means of max. and min 38.5 



Mean sensible (wet bulb) 33.5 



Monthly range f 



Highest mean daily 52.0, i8th 



Lowest mean daily 19.0, 3d 



Mean maximum 49-9 



Mean minimum 26.9 



Mean daily range 23.0 



Greatest daily range 45.0, 17th 



Least daily range 5.0,21st 



Humidity. 



Mean dew point 28.1 



Mean force of vapor 225 



Mean relative humidity 75.2 



Precipitation. In inches. 



Total precipitation, in inches i.';6 



Total snow, in inches 2j 



Number of days on which .01 inch or more 



rain fell 9 



Days of sleighing none 



Wind. 



Total movement 4483m 



Greatest daily movement 505m, 3rd 



Least daily movement 34m, 16th 



Mean daily movement i4Sm 



Mean hourly velocity 6m 



Maximum pressure per square foot, 20.0 lbs = 



63m per hour, 3rd, 10 a., N. 

 Maximum velocity for 5 minutes, 36m per 



hour, 3d, 10 A., N. 

 Prevailing direction, West Northwest 



Summary. 



Northwest 19 per cent 



West 13 " " 



Southwest 13 " " 



South 13 " " 



North 13 " " 



Northeast 10 " " 



Other directions ig " " 



Weather. 



Mean cloudiness observed . . . . 46 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 182 hours = 49 per cent 



Number of clear days 10 



Number of fair days 10 



Number of cloudy days 11 



Briiiht Sunshine. 



Number hours recorded. iSS = 51 per cent. 



Bain. 6th, Sth, i8th, 20th, 21st, 26th, 27th, 

 30th, 31st. 



Snow, 20th, 26th, 27th. 



Gales. 49m, 2d, N.; 63m, 3d, N.; 53m, Sth, W.; 



45m, 9th, W.N.W.; 39m, 30th, S.; 41m, 



31st, W.N.W. 



