BULLETIN No. 328. 



APRIL, 19 16 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 22J.^ ft. 

 Height of Wind Ifistmnwits 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 29.97, 16th, 9 A 

 Minimum reduced to freezing, 29.03, 8th, 11 P 

 Reducedt maximum reading, 30.27, i6th, 9 A 

 Reducedt minimum reading, 29.34, 8th, up 



Mean semi-daily reduced 29.917 



Monthly range 0.94 



*Air Temperature. In Degrees Fahr. 



Highest 73-5, 3oth, 3 p 



Lowest 28.0, 3d, 6:30 A 



Mean hourly . .43-9 



Mean of means of max. and min 44.6 



Mean sensible (wet bulb) 40.5 



Monthly range 45-5 



Highest mean daily 56.3, 30th 



Lowest mean daily 32-5 9th 



Mean maximum 54.1 



Mean minimum 35-1 



Mean daily range i9-o 



Greatest daily range 40.0, i6th 



Least daily range 3-5i 4th 



Hnmidity. 



Mean dew point 37.4 



Mean force of vapor 283 



Mean relative humidity 81.2 



Precipitation. In inches. 



Total precipitation 3.69 



Number of days on which .01 inch or more 



rain fell 11 



Total snow in inches 4.t 



* Temperature in ground shelter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement 4836 m 



Greatest daily movement 424m, 15th 



Least daily movement .38m, 20th 



Mean daily movement 161 m 



Mean hourly velocity 6,7 m 



Maximum pressure per square foot, 18.5 lbs = 



61 m per hour, 15th, 10 A, N. 

 Maximum velocity for 5 minutes, 48m per 



hour, 15th, 10 A, N. 

 Prevailing direction. West. 



Summary. 



Northeast 17 per cent 



East 13 " " 



West 20 " " 



Northwest 10 " " 



Other directions 40 " " 



Weather. 



Mean cloudiness observed .... 65 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 279 hours = 69 per cent 



Number of clear days 5 



Number of fair days 8 



Number of cloudy days 17 



Briight Sunshine. 



Number hours recorded, 123 hrs, = 31 per cent 

 Rain, ist, 4th, 6th, 12th, 13th, 14th, 17th, 21st, 



22d, 73d, 24th, 26th, 27th, 28th. 

 Snow. 4th, 6th, 8th, 9th, 14th. 

 Hail. 9th. 



Frosts, after the 15th — 2Sth. 

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



N,\V.; 39m, 7th, W.N.W.; 40m, 9th, N.; 



35m, 12th, N.; 6im, 15th,' N.; 43m, i8th, 



N.W.; 39m, 19th, N.W. 



