BULLETIN No. 338. 



FEBRUARY. 1917 Coiie^^ 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, Ji ft. Above sea level, 2YJ.^ ft. 

 Height 0/ Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.09, 13th, 8 a 

 Minimum reduced to freezing, 28.61, 5th, 11 A 

 Reducedt maximum reading, 30.43, 13th, S A 

 Reducedt minimum reading, 28.93, 5th, 11 A 



Mean semi-daily reduced 29.930 



Monthly range i.i;o 



*Air Temperature. In Degrees Fahr. 



Highest 46,0, 27th, 2:30 p 



Lowest -16.0, 13th, 7 A 



Mean hourly 20.6 



Mean of means of max. and min 19.Q 



Mean sensible (wet bulb) 17.4 



Monthly range 62.0 



Highest mean daily 3S.5, 27th 



Lowest mean daily o.S, 12th 



Mean maximum 29.6 



Mean minimum 10. 



Mean daily range 19.3 



Greatest daily range 38. o, 13th 



Least daily range lo.o, loth 



Humidity. 



Mean dew point 14.2 



Mean force of vapor 117 



Mean relative humidity 82.7 



Precipitation. In inches. 



Total precipitation, in inches i 



Total snow, in inches 11 



Number of days on which .01 incli or more 



rain fell 9 



Days of Sleiiihin;^ 28 



* Temperature in ground slielter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement 4485 m 



Greatest daily movement 488m, loth 



Least daily movement 21m, 15th 



Mean daily movement 174 m 



Mean hourly velocity 7-3 m 



Maximum pressure per square foot, 15.0 lbs = 



55m per hour, 5th, 10 A, S.W. 

 Maximum velocity for 5 minutes 30m per 



hour, qth, 2P, S.W. 

 Prevailing direction. West. 



Summary. 



South Southwest 11 per cent 



West iS " " 



West Northwest 11 " " 



Northwest 18 " " 



Other directions 42 " 



Weather. 



Mean cloudiness observed .... 45 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . .116 hours = 39 per cent 



Number of clear days 10 



Number of fair days 13 



Number of cloudy days 5 



Bright Sunshine. 



Number hours reco^ed, 180 hrs, = 61 per cent 

 Rain, ist, 9th, 23d, 24th, 26th. 

 Snow, ist, 4th, 5th, 9th, 19th, 2oth. 

 Gales, 35 or more miles per hour. 43m, 2d, 



N.N. W.; 49m, 3d, S.S.E.; 55m, 5th, S.W.; 



36m,6th,S.; 38m,9th,S.W.; 52m,ioth,N.W.; 



36m, 17th, S..; 3gm, 23d, S.S.W.; 42m, 24th, 



W.; 35m. 26th, S. 



