BULLETIN No. 8. AUGUST, 1889. 



METEOROLOGICAL OBSERVATORY 



OK Tin: 



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. 



MONTHLY SU/VIMARY. 



Preatture, In Inches. Actual niaxiniuni reading 30.150; actual minimum reading- '20.510; 

 iMcan reduced to 3."^ F., 29.718; Monthly Range, .540. 



Air Temperature. In Degrees Fahreidielt. Highest, 82.0"; Lowest, 45.0*^; INIean, 05.5'^; 

 Monthly Range, 37.0* ; Highest Mean Dally, 74.3'^; Lowest Mean Daily, 5!).5*'; Mean Maxi- 

 mum, 75. 0'-'; Mean Minimum, 5().9*; Mean Daily Range, 18.18; Greatest Daily Range, 31.0". 



Huniiditij, .Mean Dew Point, 59.5''; Mean Force of Vapor, .6591 ; Mean Relative Humid- 

 ity, 80.4. 



Wind. Prevailing Directions, X., N. E., S. W. ; Total Movement, 2811 miles; Greatest 

 Dally Movement, 213 miles, 2nd; Least Daily Movement, 16 miles, 30th; Mean Daily Move- 

 ment, 91 miles, Mean Hourly Velocity, 3.8 miles; Maximum Pressure per Square Foot 

 (i 1-2 lbs. =36 m. per hour, 14th, at 3 v. M. 



Precipitation. In Inches. Total Precipitation, 2.35 in. ; at base of tower 2.72 In. 



Wetithcr. Mean Cloudiness, on a Scale of 10, 4.3 ; Number of Clear Days, 7. ; Number 

 of Cloudy Days, 12 ; Number of Fair Days, 12 ; .Total Cloudiness recorded by the Sun 

 Thermometer, 221 hrs, or .5.3.4 per cent. Numl)er of days on which .01 inches or more rain 

 fell, 9. Wind followe<l by rain, 9th. 



Bri{/?it Siin.<ihine. Number of Hours Recorded, 194. 



Halos, Lunar, 4th. 



DAILY SUiVlMARY. 



AtiG. I. Barometer reduced to 32° F., ma.\. 2'J.857, rain. 20.693, mean 20.748. 

 Temperature, max. TO", 2 p. m., min. (",6°, 2 a. m., mean honrly 70.7°. 

 Sun TlierniDmeter, max. 72°, 12 m.', bright sunshine 0. 

 Mean dew point ()0.3'', mean force vapor .7001, mean humidity 93.6. 

 Wind, S. S. W., total movement, 138 m., mean lioiirly velocity 5.7 

 m., max. pressure, 5 lbs. =32 m. per hour, 3 p. m. Stopped rain- 

 ing; at 9-30 A. M., .12 in. fell; at base of tower .21 in. Ozone 6. 



2. Barometer reduced to 32° F. , max. 20.701, min. 20.584, mean 20.640. 

 Temperature, max. 81", 3 p. m., min. 60", 2 a. m., mean hourly 74.3''. 

 Sun Thermometer, max. 101°, 12 m., bright sunshine 2 hrs. 



Mean dew point 72.0°, mean force vapor .8752, mean liumidity 89.6. 

 Wind, S. W., total movement 213 m., mean hourly vol. 8.7 m., max. 

 pressure 3 1-2 lbs. =26 m. per hour, 2 p. m. Ozone 5. 



3. Barometer reduced to 32° F., max. 20.656, min. 20. .550, mean 20.624. 

 Temperature, max. 70°, 2 p. m., min. 65°, 12 p. m., mean hourly 72.1°. 

 Sun Thermometer, max. 102°, 12 m., briglit sunshine 1 hr. 

 Mean dew point 71.3°, mean force vapor .8023, mean humidity 05.6. 

 Wind, S., total movement 201 m., mean hourly vel. 8.2 m., 



max. pressure 5 1-2 lbs. =33 m. per hour, 3 p. m. Thunder sliow- 

 crs in the afternoon, .16 in. water fell: at base of tower .21 in. 

 Ozone 3. 







