METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above groimd,51ft. Above sea level, 273.5 ft. ** 



BULLETIN No. 105. 



SEPTEMBER, 1897. 



MONTHLY SUmiVIARY- 



Pressure. In inches. 

 Maximum rciUiccd to freezing, 30.10, 4tli, 7 A' 

 Minimum reduced to freezing, -29.38, 2(!tli, C P. 

 Reducedt maximum reading, 30.40, 4lli, 7a. 

 Ueduccdt min. reading, . . . 29.67., 26tli, 6 P- 



Mean reducedf, 30.091 



Montldy range 0.72 



*^ir Temperature. In Degrees Fahr. 



Highest 91.."); 10t)i 



Lowest, 32.0, 2Stli 



Mean, .59.8 



Mean of means of max. and min., . . . 00.11 



Mean sensil3le( wet bulb), .'56.2 



Montlily Range .59.5 



Highest mean daily 7<i..5, 10th 



Lowest mean daily 46.4, 28th 



.Mean maximum 73.0 



Mean minimum 47.'2 



Mean daily range 2.5.8 



Greatest daily range, 39.0, .30th 



Least daily range, 11.5, Sth, 20th 



lltitniditij. 



Mean dew point .52.7 



Mean force of vapor .582 



Mean relative humidity 76.6 



Witnt. 



Prevailing Direction, West South West. 

 .Summary. 



North 20 per cent 



South 13 " " 



South Ka.-t, 10 " " 



Soutli Southwest, 10 '> " 



West, 10 " " 



Nortli West, 10 " " 



Other directions, 27 " " 



Total movement 3506 m, 



Gi-eatest daily movement, ... 241 m., 19th 



Least daily movement 37 m. ,29th 



Mean daily movement, '116.9 m. 



Mean hourly velocity 4.9 m. 



Maximum pressure per square foot, 20 lbs.= 

 64 m. per hour, 6 P., 26th, N. 



Precipitation. In inches. 



Total precipitation, 1.94 



Number of days on which .01 inch or more 

 rain or melted snow fell, 8 



Weather. 



Mean cloudiness observed, ... 39 per cent. 

 Total cloudiness recorded Ijy the Sun Ther- 

 mometer, . . . 152.0 hours or 41 per cent. 



Number of clear days, 12 



Number of fair days 9 



Number of cloudy days 9 



BrigJit Sunshine. 



Number of Hours recorde<l, 221 hours or 595t 



Bain, 1st, 2d, 7th, Sth, 11th, 13th, 17th, 20th, 

 23d, 24th, 26th. 



Oul<'s,ot 35 or more miles per hour, 39m., 

 Ilth.N.N.E. ; 36 m., 17th, N.; 35 m., 2l8t, 

 N.W.; 04 m., 26th, N.W.; 37 m., 27th, N. 



TliutKli'r and Lifjhtnhtg, 1.3th, 26th. 



Fr<tst, 22d, 2Sth. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



* * Determined from levels of li. &M. R. U. 



