LIBRARY or THE 



Massac!]use(ts A^rnjujn,,-^, ^^^^^^^.^ 



AMHERST, MAb«. 



BULLETIN No. 449, MAY 1926 



Meteorolooical Observations 



AT THK 



MASSACHUSETTS 



AGRICULTURAL EXPElllMENT 



STATION. 



L;ititude, 42° 23' 48.5" N. Longitude 72* 31' lo" W. 



Hei^^ht of barometer above ground, ^r ft. Above sea level, 2yj.^ ft. 

 Height of IVind Instruments 72 ft. Time used, y^th Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maxiiiuun reduced to freezing, 30.06, 28th, 6 A. 

 Minimum reduced to freezing, 29.0S, qth, 12 m. 

 Reduced maximum reading, 30.36, 28th, 6 A. 

 Reduced minimum reading, 29.38,9th, 12 m. 



Mean semi-daily reduced 29.876 



Monthly range 098 ^Jaximum pressure per square foot, 8.0 lbs = 



40m per hour, 25th, 11 a., N.W, 



Wind, 



Total movement 5150m 



Greatest daily movement 3S5m, 25th 



Least daily movement 5Sm, 28th 



Mean daily movement i66m 



Mean hourly velocity b.gni 



Maximum velocity for 5 minutes, 27m per 



hour, 25th, II A., N.W. 

 Prevailing direction, North Northwest. 

 Summary. 



Air Tempernliirp. In Degrees Fahr. 



Highest So. 0, 3rd. i p. 



Lowest 300,5th, 5.30 A. 



Mean hourly 55.3'Northwest 19 per cent. 



Mean of means of max. and min 55 5'North 16 



Mean sensible (wet bulb) 52.3 Northeast 13 



Monthly range 50.0 South 16 



Highest mean daily 65.5, iSth.East 10 



Lowest mean daily 45.0, 4th Other directions 26 



Mean maximum 68.51 



Mean minimum 42.5! Weather. 



Mean daily range 26 o Mean cloudiness observed .... 49 per cent 



Greatest daily range 420, 6th q'otal cloudiness recorded by the Sun 



Least daily range ii.5,3ist[ Thermometer . . 240 hours = 53 per cent 



I Number of clear days 4 



jNumber of fair days 17 



! Number of cloudy days 10 



Humidity. 



Mean dew point 49.3 



Mean force of vapor 445 



Bright Sunshine. 



Mean relative humidity ^'-^ N„n,ber hours recorded. 213 = 47 per cent. 



Rain. 2d, 3d, 9th, nth, 13th, i6th, 17th, 



19th, 23d, 27th, 31st. 

 Frosts 5th, 6th. 



Precipitation. In inches. 



Total precipitation, in inches 1. 19 Thunder and LiiShtnini. 2d, 9th, nth. 



Number of days on which .01 inch or more I '■^' ^' "^ ' , ., , ,, x- -.ir 



,^. . „ o Gales, 39m. 8th, N.; 36m, 12th, N.W.: 35m. 



rain fell S 21st, S.; 40m. 25th, N.W.; 



