METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of ha ro meter above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments J2 ft. 



BULLETIN No. 189. 



SEPTEMBER, 1904. 



MONTHLY SUMMARY. 



¥rensure. In inches. 

 Maximum reduced to freezing, 30.31,23d, 8 .\• 

 ^Iinimum reduced to freezing, 29.14,30th, I r. 

 Reducedt maximum reading, 30.62, 23d, 8 .\. 

 Reduced+ minimum reading, 29.42, 30th, i p. 



Mean semi-daily reduced, . 30.0S1 



Monthly range, 1.20 



* Air Teinj)erature. In Degrees Fahr. 



Highest 84. 5, i2th, 2:30 p. 



Lowest 26.0, 23d, 7 A. 



Mean hourly, 59-8 



Mean of means of max. and min 60.2 



Mean sensible (wet bulb), 55.1 



Monthly range 5S.5 



Highest mean daily, 73-o,3<i 



Lowest mean daily, 4'-3i 22d 



Mean maximum, 7i-5 



Mean minimum 49-1 



Mean daily range, 22.4 



Greatest daily range 36.0, 7th 



Least daily range, 7-0i '4th 



Uiitniditi/. 



Mean dew point 52.7 



Mean force of vapor 505 



Mean relative humidity, St. 8 



Precipitation. In inches. 



Total precipitation, 5.4; 



Number of days on which .01 inch or more 



rain or melted snow fell 14 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3602 ni. 



Greatest daily movement, . . . 294 m., 24th 



Least daily movement, igm., 5th 



Mean daily movement, 120m. 



Mean hourly velocity, 5.0m. 



Maximum pressure per square foot, 14.5 lbs.= 



54 m. per hour, 30th, 3 P., W.N.W. 

 Prevailing Direction, Southwest. 



Summary. 



South, 30 per cent. 



North, Northwest, '3 " " 



North, 10 " " 



South, Southeast, 10 " " 



Other directions, 37 " " 



WeatJier. 



Mean cloudiness observed, .... 54 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . i69hrs.=45 percent. 



Number of clear days, 11 



Number of fair days, 9 



Number of cloudy days, 10 



Bright Sunshine. 



Number of hours recorded, . . . 204 hrs. = 55< 

 Bain, ist, 2d, 3d, 4th, 8th, gth, 12th, 13th. 14th. 



15th, 20th, 24th, 25th, 26th, 2Sth, 29th, 30th. 

 Gales, 35 miles or more per hour, 35m. 2otli, 



N.: 54m. 30th, W.N.W. 

 Thunder and. Jjightning, 4th, i2lii, Mtli, 



15th, 29th. 

 Killing Front, 22d, 23d. 



