METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 51 ft. Above sea level, 2'jj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 197. MAY. 1905^ 



MONTHLY SUMMARY. 



freaaiire. In inches. 



Maximuni reduced to freezini;, 3o.oS,4tli, 12 i", 



5th, S A. 

 Minimum reduced to freezing, 29.24, uSth,4F. 

 Keducedt maximum reading, 30.3S, 4th, 12 p, 



5th, S A. 

 Reducedt minimum reading, 29.53, 18th, 4 p. 



Mean semi-daily reduced, 29.962 



Montlily range, o.(S5 



*Air Tetnperatnre. In Degrees Fahr. 



Highest 82.5,3d, 4 P 



Lowest 32.0. 24th, 6 A 



.Mean hourly, 5'^'-9 



Mean of means of max. and min., .... 57.0 



Mean sensible (wet bulb), 51. i 



Monthly range, 50.5 



Highest mean daily, 68.8, 2Ktli 



Lowest mean daily, 444. ist 



Mean maximum 69.1 



Mean minimum, 44.9 



Mean daily range, 24.2 



Greatest daily range, 43-°, 3d 



Least daily range, 8.0, 14th 



Uttmidity . 



Mean dew point 45-7 



Mean force of vapor, 473 



Mean relative humidity, 68.2 



Precipitation. In inches. 



Total precipitation, 1.2S 



Number of days on which .01 inch or more 



rain or melted snow fell 11 



Total snow in inches, Trace 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5004 ni. 



Greatest daily movement 390 m., 26th 



Least daily movement, 47 m., 17th 



Mean daily movement . i6ini. 



Mean hourly velocity, 6.7m. 



Maximum pressure per square foot, 9.5 lbs.= 



44 m. per hour, ist, 2 P., W. 

 Prevailing Direction, West Southwest. 

 Summary. 



South, i3percent. 



South, Southwest, '3 " " 



West, Northwest, 13 " " 



West, 10 " " 



.South, Southeast, 10 " " 



Other directions, 41 " " 



Weather. 



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

 Total cloudiness recorded by the Sun Ther- 

 mometer, i67hrs.=37 per cent. 



Number of clear days, 16 



Number of fair days, 8 



Number of cloudy days, 7 



Bright Sunahine. 



Number of hours recorded, . . . 286 hrs.=63* 

 JJam, 2d. 5th, 6th, 9th, 12th, 13th. 14th. 15th, 



i6th, 17th, iSth, 26th, 29th, 30th. 

 Snow, ist. 

 Galea, T,y miles or more per hour, 44 m. 1st, 



W.; 36 m. 7th, W.N.W.; 36 m.gth. N.W.; 



41 m. 25th, S.S.W.; 39 m. 26th, S.S.W. 

 Thunder and LigJitnlng, 3d, 9th, 15th, 



29tti, 30th. 

 Froat, 2ist, 22d, 24th. 



