^ LIBRARY 



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METEOROLOaiCAL OBSERVATORY 



OF THK 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE 



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



Height of ha romctei- above groimd^ 51 fi- Above sea level, 273-5 fi- 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 149. 



MAY, 1901 



MONTHLY SUMMARY. 



Vresaure. In inches. 

 Maximum reduced to freezing;, 29.90, 2;th, 9 r 

 Minimum reduced to freezing, 29,13, 3d, 3 .\. 

 Reducedt maximum reading, 30.20, 15th, 9P 

 Reducedt minimum reading, 29.43, Sd, 3 A- 



Mean tri-daily reduced, 29.877 



Monthly range, . . . . • 77 



*Air Tetnperntiire. In Degrees Fahr. 



Highest S2.0, 24th, 1:30 r. 



Lowest, 3'-5. 6tli, 5:30 a. 



Mean hourly, 56-2 



Mean of means of nr.is.. and min., .... 55. S 



Mean sensible (wet Inilb), 51.3 



Monthly range, 5o-5 



Highest mean daily 69.0, 24th 



Lowest mean daily, 44.7, 2d 



Mean maximum, 66.4 



Mean minimum, 45.1 



Mean daily range 21.3 



Greatest daily range, 43.5, 7tli 



Least daily range, 4.0, 19th 



Ifimiitlit;/. 



Mean dew point, 45.7 



Mean force of vapor, 495 



Mean relative humidity, 68.1 



yreclj>itntion. In inches. 



Total precipitation, . • 6.91 



Number of days on which .01 inch or more 

 rain or melted snow fell, 20 



♦ Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4525m. 



Greatest daily movement, 353 m., 3d 



Least daily movement 23 m., 30th 



Mean daily movement, 146.0 m. 



Mean hourly velocity, 6.1 m. 



Maximum pressure per square foot, 11.5 lbs.= 



4S m. per hour, 5th, 2 p., N.N.W. 

 Prevailing Direction, Southwest. 

 Summary. 



South, 26 per cent. 



Southwest, 16 " " 



North, ... 10 " " 



Otiier directions 48 " " 



Weather. 



Mean cloudiness observed, .... 70 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 294 hrs.=65 per cent. 



Number of clear days, 5 



Number of fair days, 9 



Number of cloudy days, 17 



Uriffht Sunshine. 



Number of hours recorded, . . . 159 hrs. =3511 

 Rain, ist, 2d, 3d, 9th, loth, nth, 12th, 13th, 



i8th, 19th, 2oth, 22d, 23d, 24th, 25th, 26th, 



27th, 2Sth, 29th, 30th. 

 Laat Frost, 6tli. 

 Gales, 35 miles or more per Hour, 45ni., 3d, 



N.; 41 m., 4th, N.N.W.; 48 m., 5th, N.N.W. 



Thunder and Lightniny, 2d, 24th. 



