»nt 



h^-icUM^ A^HkiLliuril College 



AMHbfvST. MASS. 



BULLETIN No. 46 1. 



MAY, 1927 



Meteorolooical Observations 



AT IHK 



MASSACHUSETTS 



AGRICULTUIUL EXPEIllMENT 



STATION, 



Latitude, 42° 21,' 48.5" N. Longitude 72* 31' 10" W. 



/ff/:;^/i/ of Ihiriyineter above ground, jf ft. Al>ore sea level, 2jj.^ ft. 

 Height oj Wind Instruments J 2 ft. Time used, j^thMer. 



MONTHLY SUMMARY. 



Pressure, in inclies. 



Maxi:mini i educed to freezing, 30.18, 21st. 11 A. 

 Minimum reduced to freezing, 29.24, 26th, 4 p. 

 Reduced ma.ximum reading, 30.47, 21st, 11 A. 



22d, lA. 



Reduced minimum reading, 29.53, 26th, 4 p. 



Mean semi-daily reduced 29.917 



Monthly range 0.94 



Air Tempernltire. 



In Degrees Fahr. 



Highest 75.0, nth, 4 p. 



Lowest 3r.o, 2nd,5:3o A. 



Mean hourly 53.2 



Mean of means of max. and min 53.9 



Mean sensible (wet bulb) 50.5 



Monthly range 44-0 



Highest mean daily 630, nth 



Lowest mean daily 42.0, 5th 



Mean maximum 64.8 



Mean minimum 43.0 



Mean daily range 21.8 



Greatest daily range 36.5, 29th 



Least daily range 7.0, loth 



Iliiiiiidity. 



Mean dew point 47.8 



Mean force of vapor 407 



Mean relative liumidity 83.9 



Precipitation. In inches. 



Total precipitation, in inches 4 83 



Number of days on which .01 inch or more 

 rain fell 14 



Wind. 



Total movement 3535m 



Greatest daily movement 279ni, 27th 



Least daily movement 35in, 25th 



Mean daily movement 114m 



Mean hourly velocity 4.7ni 



Maximum pressure per square foot. 7.olbs = 



37m per hour, 7th, 2 p.N.N.W.,26th,6 A. S. 

 Maximum velocity for 5 minutes, 24m per 



hour, 27th, 6 p., N. 

 Prevailing direction. West Southwest 

 Summary. 



.South 19 per cent 



Southwest 19 " " 



North Northwest 16 " " 



Northwest 13 " " 



East 10 " " 



Other directions 23 " " 



Weather. 



Mean cloudiness observed .... 60 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 316 hours = 70 per cent 



Number of clear days o 



Number of fair days . . 11 



Number of cloudy days 20 



Briiiht Sunshine. 



Number hours recorded, 137 = 30 per cent. 



Rain. 4th, 5th, gth, loth, 13th, 15th, i6th, 19th, 

 20th, 2ist, 22d, 23d 24th, 25th, 26th, 27th, 



Thunder and Liiihinin£, 9th, 15th, i6th, 

 22d, 25th, 26th, 27th. 



Frosts, 2d. 3d. 



Gales. 37m, 7th, N.N.W.: 35m, 22d, S. S. W.; 

 37m, 26th, S.;35m, 27th, N.; 35m, 2Sth N.W. 



