BULLETIN No. 10. OCTOBER, 1889. 



METEOROLOGICAL OBSERVATORY 



OK riiK 



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 SUMMARY- 



l-'ressiire. In inches. Actual maximum reading 30.208; actual minimum reading 29.270; 

 Mean reduced to 32^ F., 29.7.10; iMonthlj- Range, .938. 



Air Teittperatuve. In Degrees Fahrenheit. Highest, at top of tower, 69.0"; at base of 

 tower, ti9.o^'; Lowest, at top of tower, 20.0^'; at base of tower, 21.0'^; Mean, 46.5*; Monthly 

 Range, 43.0^' ; Highest Mean Daily, 61.3"; Lowest Mean Daiij', 35.2"; Mean Maximum, 53.9*; 

 Mean Minimum, 38.9"; Mean Daily Range, 15.4'*; Greatest Daily Range, 29.0". 



Huniiditij. Mean Dew Point, 39.4"; Mean Force of Vapor, .3349; Mean Relative Humid- 

 ity, 75.7. 



Wind. Prevailing Direction, X. N. E.; Total Movement, 4762 miles; Greatest Daily 

 Movement, 367 miles, loth; Least Daily Movement, 20 miles, 31st; Mean Daily Move- 

 ment, 153.6 miles. Mean Hourly Velocitv, 6.4 miles; Maximum Pressure per Square Foot 

 12 141bs.=49 m. per hour, 14th, "at 12 M. and 15th, 4 a. m. 



Precipitation. In inches. Total Precipitation, 3. .59 in. ; at base of tower 4.58 in. 



Weat/ier. Mean Cloudiness, on a Scale of 10, 0.0; Number of Clear Days, 9; Number 

 of Cloudy Days, 16; Number of Fair Days, 6; Total Cloudiness recorded by the Sun 

 Thermometer,"l93 hrs, or .59.9 per cent. Number of days on which .01 inches or more rain 

 fell, 14. \Viuds followed by rain, Ist; by clear or fair weather, 2nd. 



Briyht Sunshine. Number of Hours Recorded, 129. 



T/i under Storm., 1st. Snotv, on northern hills, I3th. 



Frost, 3rd, .5th, 8th, 9th, 11th, 12th, 16th, 17th, 19th, 22nd, 23rd and 24th. 



Auroras, 21st. Meteors, 21st. 



DAILY SUMMARYc 



Oct. 1. Barometer reduced to 32° F., max. 29. .532, min. 29.163, mean 29.242. 

 ♦Temperature, max. 69*^, 69.5°, 4p.m., min. 55°, 57'*, 12 p.m., mean hourly 61.3°. 

 Sun Thermometer, max. 106-', 1 p.m., bright sunshine 3 hrs. 

 Mean dew point 59.0", mean force vapor .5585, mean humidity 90.0. 

 Wind, S. S. W., total movement, 213 m., mean hourly velocity 8.9. m. , max. 



pressure, 4 1-2 lbs. =30 m. per hour, 6 a. m. Showers ceased at 11-30 a. m., 



.18 in. water fell; at base of tower .31 in. Ozone 8. 



2. Barometer reduced to 32° F., max. 29.754, min. 29.240, mean 29.530. 

 Temperature, max. 57", 59.5", 10 .4..M., min. 42°, 43°, 12 p.m., mean hourly 51.7''. 

 Sun Thermometer, max. 94°, 9 a.m., bright sunshine I hr. 



Mean dew point 47.3", mean force vapor .3775, mean humidity 76.3. 

 Wind, N.W., total movement 204 m., mean hourly vel. 8.3 m., max. pressure 

 10 lbs. =45 m. per hour, 11 k. m. Ozone 6. 



3. Barometer reduced to 32° F., max. 29.847, min. 29.657, mean 29.733. 

 Temperature, max. 59°, 59.5°, 2 p. m., min. 36", 31°, 6 a. m., mean hourly 48.6°. 

 Sun Thermometer, max. 109°, 10 a. m., bright sunshine 10 hrs. 



Mean dew point 41.6°, mean force vapor .3734, mean humidity 75.0. 



Wind, S.S.W., total inovement 141 m.. mean hourly vel. 5.9 m., max. pres- 

 sure 3 3-4 lbs. =27 m. per hour, 3 p. m. Ozone 1. 

 *The first figures denote reailings at top of tower, the second at base. 



