BULLETIN No. 354. 



APRIL, 1919 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 5/7?. Above sea level, 2yj.^ ft. 

 Height oj IViTid Instruments J 2 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.07, 22d, Q A 

 Minimum reduced to freezing, 29.33, 26th, 3 A 

 Reduced maximum reading . . 30.37, ,22d 9 A 

 Reduced minimum reading, 29.65, 26th, 3 A 



Mean semi-daily reduced 30.029 



Monthly range 0.72 



*Air Temperature. In Degrees Fahr 



Highest 74.0, 23d, 4-30 P 



Lowest 18.0, 2d, 3 A 



Mean hourly 45-4 



Mean of means of max. and min 45.7 



Mean sensible (wet bulb) 40.2 



Monthly range 56.0 



Highest mean daily 56.0, 23d 



Lowest mean daily 25.5, ist 



Mean maximum 55.9 



Mean minimum 35.4 



Mean daily range 20.5 



Greatest daily range 38.5, 23d 



Least daily range 6.5,10th 



Humidity. 



Mean dew point 34.0 



Mean force of vapor 307 



Mean relative humidity 68. i 



Precipitation. In inches. 



Total precipitation, in inches 2.37 



Total snow, in inches Trace 



Number of days on which .01 inch or more 



rain fell 10 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 5374 m 



Greatest daily movement 46Sm, 25th 



Least daily movement 50m, 5th 



Mean daily movement 179m 



Mean hourly velocity 7.5 m 



Maximum pressure per square foot, 9.5 lbs 



44m per hour, 25th, 3P, W.N.W. 

 Maximum velocity for 5 minutes, 32m per 



hour, nth, 3P, S.S.W. 

 Prevailing direction. West Northwest. 



Summary. 



Northwest 20 per cent 



West 13 " " 



South 10 " " 



North Northwest 10 " " 



North 13 " " 



West Northwest 10 ■' " 



South Southwest 10 " " 



Other directions 14 " " 



Weather. 



Mean cloudiness observed .... 50 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 153 hours = 38 per cent. 



Number of clear days 13 



Number of fair days 11 



Number of cloudy days 6 



Bright Sunshine. 



Number hours recorded, 249 hrs,= 62 per cent. 

 Rain. 5th, 7th, Sth.gth, loth, nth, 12th, i6th, 



24th, 2Sth, 29th. 

 Snow, 25th. 

 Frost, ist. 2d, 3d, I5tli, 19th, 22d, 24th, 25th, 



26th, 27th. 

 Gales, 35 miles or more per hour : 43m., 



nth, S.S.W. ; 44m, 25th, W.N.W. 



