BULLETIN No. 256. 



APRIL, 19 10 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of hanvneler above ground, 51 ft. Above sea /eve/, 2Yj.^ ft. 

 Height of Wijid Instruments 72 ft. 



MONTHLY SUMMARY. 



FresHuve. In inches. 



.Maxumim reduced to freezing. 30 09. i7tli, 7 A. 

 Mininiuin reduced to freezing. 29.20, 7th, 2 A. 

 Reduced! niaxiniuni reading, 30.40, I7tii, 7 A. 

 Reduced^ mininnun reading, . 29.50, 7tli, 2 A. 



Mean semi-daily reduced, 29.965 



Montlily range, 0.90 



*Air Temperature. In Degrees Fahr. 



Highest 80.0. 5th, 5 p. 



Lowest 24.0, nth, 6 A. 



Mean hourly, S0.6 



Mean of means of max. and min., .... 50.4 



Mean sensible (wet bulb), 44-6 



Monthly range 56.0 



Highest mean daily, 62.2. 6th 



Lowest msan d lily 38.5,11th 



.Mean maximum, 62.4 



Mean minimum, 38-4 



Mean daily range, 24.0 



Greatest daily range 39-Oi 3<^ 



Least daily range, 9.0,25th 



llnmiditjl. 



Mean dew point 



M ian force of vapor, . 

 Mean relative humidity. 



39-2 

 .362 

 6g.i 



FreclpUntion. In inches. 



Total precipitation, 3.07 



Number of days on which .01 inch or more 



rain or melted snow fell, -8 



Total snow in inches none 



* L'emp'irature in ground slielter. 

 t Keduced to freezing and sea-level. 



Wind. 



Total movement, 5533m. 



Greatest daily movement, .... 379m., 8th 



Least daily movement 43111. ,5th.- 



Mean daily movement, 184m. 



Mean hourly velocity, 7.7 in- 

 Maximum pressure per square foot, 6.0 lbs.= 



35111. per hour, 28th, 11 a., E.N.E. 

 Maximum velocity for 5 minutes, 32m. per 



hour 6th, 5P., S.S.W. 

 Frevaihng Direction, West. 

 Summary. 



West Northwest 23 percent. 



South Southwest 17 " " 



South 13 " " 



Other directions, 47 " " 



\Venther. 



Mean cloudiness observed, . ... 56 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, ii6hrs.=29 per cent. 



Number of clear days, 16 



Number of fair days, 10 



Number of cloudy days, 4 



Bright Stinahine. 



Number of hours recorded, . . 2S6 hrs. = 7i^ 



Kain, 4th, 6th, 7th, Sth, gfh, 11th, 17th, iSth, 



19th, 22d, 25th, 26th, 29th, 30th. 



Frosts, nth, 13th, 17th, 29th. 



Liglitniiis:, oth. 



Gale8, 35 miles or more per hour; 35m, 



2Sth, E.N.E. 



