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BULLETIN No. 352. 



FEBRUARY, 1919 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

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



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.11, 20th, 9 a 

 Minimum reduced to freezing, 2S.96, 15th, 2 p 

 Reduced maximum reading . . 30.43, 20th, 9 a 

 Reduced minimum reading, . 2927, 15th, 2 p 



Mean semi-daily reduced 29.963 



Monthly range i.i6 



*Air Temperatnre. In Degrees Fahr. 



Highest 49.0, 13th, 3 P 



Lowest 8.5, nth, 7:30A 



Mean hourly 28.4 



Mean of means of max. and min 28.7 



Mean sensible (wet bulb) 24.2 



Monthly range 40-5 



Highest mean daily 36.5, 24th 



Lowest mean daily 19.7, 11 h 



Mean maximum 37-4 



Mean minimum 20.0 



Mean daily range 17.4 



Greatest daily range 36.0, 13th 



Least daily range 4.0, 14th 



Humidity. 



Mean dew point 20 2 



Mean force of vapor 149 



Mean relative humidity 78.6 



Precipitatiou. In inches. 



Total precipitation, in inches 2, So 



Total snow, in inches 11 j 



Number of days on which .01 inch or more 



rain fell S 



Days of sleighing, 3 

 •Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 5031 m 



Greatest daily movement 43om, 19th 



Least daily movement 26m, 13th 



Mean daily movement i8om 



Mean hourly velocity 7-5 nn 



Maximum pressure per square foot, 8.5 lbs 



4ini per hour,24th, lOA, W.N.W. 

 Maximum velocity for ; minutes, 30m per 



hour, 24th, loA, W.N.W. 

 Prevailing direction. Northwest. 



Summary. 



Northwest 29 per cent 



North Northwest 21 " " 



North 14 " " 



West Northwest 11 '' " 



Other directions 25 " " 



Weather. 



Mean cloudiness observed .... 38 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . So hours = 27 per cent 



Number of clear days 17 



Number of fair days 7 



Number of cloudy days 4 



Brii(ih< Sunshiue. 



Number hours recurded, 216 hrs, = 73 per cent 



Rain. 4th, 14th, 25th, 26th, 2Sth. 



Snow, 4th, 14th, 2ist, 22d, 23d, 25th, 26th. 



Hail. 14th. 



Gales, 35 miles or more per hour : 39m., 

 ist, N.N.W.: 35m, 2d, N.W.; 35m, iSth, 

 N.N.W.: 40m, 19th, N.W.: 4ini, 24th, 

 W.N.W. 



