METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of hixrometfr above ground, ^i ft. Above sea level, 2^3.^ ft. 

 Height of Wind Instruments 72 ft. 



AUGUST, 1904. 



BULLETIN No. 188. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maxinuini reduced to freezing, 30.12, loth, o a. 

 Mininuim reduced to freezing, 29.40, 20th, ; p. 

 Reducedt maximum reading, 30.42, lotli, o A. 

 Keducedt minimum reading, 29.69, 20th, 5 p. 



Mean semi-daily reduced, 30.030 



Montlily range 0.73 



*Air Temperature. In Degrees Falir. 



Highest S9.5, ist, 6a. 



Lowest 40-0. 27th, 6 A. 



Mean iiourly, 66.4 



Mean of means of max. and min., .... 66.9 



Mean sensiiale (wet bulb), 61.3 



Monthly range 49-5 



Highest mean daily, 74.5. '^t 



Lowest mean daily 57.4i lo'h 



Mean maximum, 79-2 



Mean minimum, 54-5 



Mean daily range 24.7 



Greatest daily range, 37-5. 24th 



Least daily range, 10.0, 2d 



Wind. 



Total movement, 3229 m. 



Greatest daily movement 231 m., 5th 



Least daily movement 26m., 27th 



Mean daily movement, io4ni. 



Mean hourly velocity, 4-3ni. 



Maximum pressure per square foot, 65.0 Ibs.^ 



36 m. per hour, 20th, 4 p., S. 

 Prevailing Direction, South Southwest. 



Summary. 



South, 35 per cent. 



Northwest, lo " " 



West, 10 " " 



South, Southwest, 10 " " 



Other directions, 35 " " 



Weather. 



Mean cloudiness observed, .... 47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . i37hrs.=32 percent. 



Number of clear days, • • • n 



Number of fair days, 14 



Number of cloudy days, 6 



Hutniditij. 



Mean dew point, 59-0 



Mean force of vapor, 630 



Mean relative humidity, 80.5 



Precipitation. In inches. 



Total precipitation, 



Number of days on which .01 inch or more 



rain or melted snow fell, 11 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Bright Sunshine, 



Number of hours recorded, . . . 292 hrs.=68^ 

 Rain, ist, 2d, 3rd, 6th, 8th, loth, nth, 13th, 



14th, 17th, 20th, 22d, 23d. 



Oales, 35 miles or more per hour, 36 m. 20th, 



"'■° |T/tMn</er and Lightning, ist, 2nd, 7th, 

 Sth, loth, 17th, 20th. 



