BULLETIN No. 9. SEPTEMBER, 1889. 



METEOROLOGICAL OBSERVATORY 



OK THK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Lntitmle. 42° 23' 4.S.5" N. Loiigitude, 72° 31' 10" \V. 



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



MONTHLY SUMMARY, 



PresHiire, In inches. Actual maximum reading 30.100; actual mininium roa(ling-'2i).]'2fl; 

 Mean reduced to Si"" F., i>9.700; Montlily Range, .980. 



Air Tr lit pernt live,. In Degrees Fahrenlieit. Highest, 79.0^; Lowest, 40^'^; Mean, (51. 9*; 

 Monthly Uange, 39.0^'; Highest Mean Dally, 7-2.2'^; Lowest Mean Daily, .50.7'^; Mean Maxi- 

 mum, (i8.9-'; Mean .^linimum, 55.4'^; Mean Daily Range, 13.4'^; Greatest Daily Range, 28.0". 



Hmniditij . Mean Dew Point, 56.9'^; Mean Force of Vapor, .5824; Mean Relative Humid- 

 ity, 83.3. 



Wind, Prevailing Direction, S. AV.; Total Movement, 4310 miles; Greatest Daily 

 Movement, 328 miles, 11th; Least Daily Movement, 34 miles, 2nd; .Mean Daily Move- 

 ment, 143.6 miles, Mean Hourly Velocity, 6.0 miles ; Ma.ximum Pressure i)er Square Foot 

 9 3-4 lbs.=44 m. per hour, 10th, at 9 A. 31. 



Precipitation. In inches. Total Precipitation, 2.36 in. ; at base of tower 3.17 in. 



Weather. Mean Cloudiness, on a Scale of 10, 6..t; Number of Clear Days, 8; Number 

 of Cloudy Days, 19; Number of Fair Days, 3; Total Cloudiness recorded by the Sun 

 Thermometer, 239 hrs, or 66.6 per cent. Number of days on which .01 inches or more rain 

 fell, 11. Winds followed by rain, llth, 17th, 20th, and 30th. 



Briyht Sunshine. Number of Hours Recorded, 120. 



Thunder Storm, 17th. 



Frost, 2l8t and 23rd. 



DAILY SUMMARY. 



Sept. 1. Baromt-ter reduced to 32° F., max. 30.013, min. 2!).1»07, mean 29.979. 

 Temperature, max. 77*^, 3 r. m.. min. 60°, 6 a. >t., mean hourly (i8.3°. 

 Sun Thermometer, max. 129-', 2 p.m., bright yunshine 11 hrs. 

 ilean dew point 59.0"^, mean force vapor .7129, mean humidity 74. 

 Wind, X. X. E., total movement, 62 m., mean hourly velocity 2.6. 

 m., max. pressure, l-41bs.=7 m. per hour, 10 a. m' Ozone 6. 



2. Barometer reduced to 32° F., max. 30.014, min. 29.83.5, mean 29.912. 

 Temperature, max. 76*^, 3 p. m., min. 53°, 7 a. m., mean hourly 65.7''. 

 Sun Thermometer, max. 120°, 12 m., bright sunshine 12 hrs. 

 Mean deM* point 60.6*^. mean force vapor .6752, mean humidity 81.6. 

 "Wind. S. W., total movement 34 m., mean hourly vel. l.-l m., max. 



pressure 1-4 lbs. =7 m. per hour, 9 p. m. Ozone 6. 



3. Barometer reduced to 32° F., max. 29.870, min. 29.743. mean 29.808. 

 Temperature, max. 76*^, 3 p. m., min. 62°, 7 a. m., mean hourly 68.5°. 

 Sun Thermometer, max. 119°, 1 p. m., bright sunshine 12 hrs. 

 Mean dew point 65.0°, mean force vapor .7178, mean humidity 87. 

 Wind, S., total movement 58 m.. mean hourly vel. 2.4 m., 



max. pressure 1-4 lbs. =7 m. per hour. 10 p. M. Ozone 3. 



