BULLETIN No. 473. 



MAY, 1928 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGIIICULTUIUL EXPERIMENT 



STATION. 



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



Height of barometer above ground, ^i ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instrmnents Y2 ft. Titne used, y^thAfer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maxiniuni reduced to freezing, 30. oS, 14th, S A 

 Miniiniini reduced to freezing, 29.20, 26th, i P- 

 Reduced maximum reading, 30.38, 14th, 8a 

 Reduced minimum reading, 29.50, 26th, i p 



Mean semi-daily reduced 29.92 



Monthly range 88 



Air Temperuiure. 



In Degrees Fahr. 



Highest 80.5, 17th, 2 p 



Lowest 31.0, 14th, 5-30 A 



Mean hourly 550 



Mean of means of max. and niin 5 



Mean sensible (wet bulb) 50.9 



Monthly range 49 5 



Highest mean daily 62 3, 4th 



Lowest mean daily , . . . 46.2, 13 h 



Mean maximum 66.1 



Mean minimum 44.1 



Greatest daily range 470, loth 



Least daily range 5.5,23rd 



Humidify. 



Mean dew point 46.9 



Mean force of vapor 433 



Mean relative humidity 77.1 



Precipiiaflon. In inches. 



Total precipitation, in inches 3.25 



Number of days on which .01 inch or more 

 rain fell 9 



Wind. 



Total movement 37i6m 



Greatest daily movement 287m, 12th 



[.east daily movement 32m, 28th 



Mean daily movement 120m 



Mean hourly velocity 5.0m 



Maximum pressure per square foot, 11. lbs = 



47in per hour, 12th. 2 p.,N.W. 

 Ma.ximum velocity for 5 minutes, 27m per 



hour, 12th, 2 p. 

 Prevailing direction, Northwest. 

 Summary. 



Northwest 13 per cent 



South Southeast 13 " " 



South 13 " " 



West 10 " " 



North Northeast 10 " " 



North 7 " " 



Northeast 7 " " 



West Northwest 7 " " 



Other directions 20 " " 



Weather. 



Mean cloudiness observed .... 54 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . , 226 hours = 50 per cent 



Number of clear days 10 



Number of fair days 8 



Number of cloudy days 13 



Bright Sunshine. 

 Number hours recorded. 227— 50 per cent. 



Kain. nth, i8th, 19th, 20th, 23rd, 25th, 26th, 

 27th, 28tli, 29th, 30th. 



Thunder and Liahninii. 2Stli, 30th. 



Frosts, 10th, 14th. 



Gales, 47m, i2th, N.W.: 35m, 13th, N.N. W. 



