METEOROLOGICAL OBSERVATORY 



OK THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above ground, 51 ft. Above sea level, 260 ft. 



BULLETIN No. 93. 



SEPTEMBER, 1896. 



MONTHLY SUMMARY. 



Pressure. In Inchea. ] 



Actual maximum reading, . . 30.13, 25tli, 9 a.[ 



Actual mill, reading 29.27, IKtli, 5 P. 



Reduced maximum reading, .30.41,2.5111, 9 A. 



Reduced min. reading 29.55, 19th, 5 v.. 



Mean reduced to sea level, 30.099 



Monthly range O.SGi 



*Air Temperature. In Degrees Fahr. 



Highest 88.5; 11th 



Lowest 31., 24th 



Mean, 59.3 



Mean of means of max. and min., . . . .59.5 



Mean sensible(wet bulb), 56.9 



Monthly Range, 57.5 



Uighest mean daily 75.4, Uth 



Lowest mean daily 43.6, viSd 



Mean maximum, 70.3 



Mean minimum, 48.8 



Mean daily range 21.5 



Greatest tlaily range 33.5, 2d, 25th 



Least daily range, 10., 17th, 22d 



Humidity, 



Mean dew point 54.5 



Mean force of vapor 543 



Mean relative humidity 84.0 



Wind. 



Prevailing Direction, west, southwest. 



Summary. 



North 13 per cent 



West 10 " " 



South 20 " " 



West South West 10 " " 



Other directions 47 " " 



Total movement 468G ni. 



Greatest daily movement, . . . 3.55 m., 10th 



Least daily movement, 50 m., 7th 



Mean daily movement, 156.2 m. 



Mean hourly velocity, G.5m. 



Maximum pressure per square foot, 16 Ibs.^ 

 57 m. per hour, 19th 5 p. 



Precipitation. In inches. 



Total precipitation, 5.41 



Number of days on which .01 inch or more 



rain fell, 10 



Weather. 



Mean cloudiness observed, ... 52 per cent. 

 Total clouiliness recorded by the Sun Ther- 

 mometer, ... 184 hours or 49 per cent. 



Number of clear days 9 



Numberof fair days, 8 



Number of cloudy days, 13 



Bright Sunshine. 



Number of Hours recorded, 189 hours or 51 * 



K«in,3d, .5th, 6th, 9th, 10th, 12tli, 17th, 18th, 



19th, 22d, 28th, 29th, 30th. 

 Gales, ot 35 or more miles per hour, 44m., 

 3d, S.S.W. ; 37m., 9th, N.N.E.; 39m., 10th, 

 N.N.W.; .57m., 19th, .S.VV.; 37m. 22d, N.; 

 37m., 23d, N.;37m., 3Cth, S.S.W. 

 Thunder and Lightning, 3<l, 6th, 17th, 



19th. 

 First Frost on ground, 2l8t. 

 " " in shelter, 24th. 



Temperature in ground shelter. 



