BULLETIN No. 22. OCTOBER, 1890. 



METEOROLOGICAL OBSERVATORY 



()!• I UK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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



MONTHLY SUMMARY. 



Pressure. Ill inches. Actual niaxiimuii reailing 30.11; actual niinimum reading 29.025; 

 Mean reiluced to sea level, 29.88; Montlilj- Range, 1.085 in. 



*Air Tt'niperature. In Degrees Fahrenheit. Highest, 72..5'^; TS"-'; Lowest, 30'^; 26''; 

 Mean, 48..>'; 4S.2'-~; Monthly Range, 42..5", 52"; Highest Mean Daily, 62.8^', M.S"^; Lowest Mean 

 Daily, 3!t.8'-\3S"; Mean Maximum, 55'^, 58.1'^; Mean Minimum, 4 .9^^, SS.S'^; Jlean Daily 

 Range, KJ.J, 19.8"^; Greate.-<t Daily Range, 25'^; 36.5"-\ Least Daily Range, S.-o"; 8'^. 



Hiituiftiti/. Mean Dew Point, 41"-^; Mean Force of Vapor, .3982; Mean Relative 

 Humidity, U9 2. 



fViiid. Prevailing Dii-ections, N. 20 per cent., N.W. 15 per cent., S.E. 9 per cent., 

 S.W. 9 i)er cent., S. 9 per cent., other directions 38 per cent. ; Total Movement, 4143 miles; 

 Greate.-^t Daily Movement, 380 m., 24th; Least Daily Movement, 28 m. 14th: Jlean Daily 

 Movement 132.(5 miles; Mean Hourly Velocity, 5.5 miles; Ma.ximum Pressure per Square 

 Foot, 11 Il)s.=r47 m. per hour, 19th, at 1 P. M. 



Preripitntion. In inches. Total Precipitation, 5.39 in.; at base of tower 7.13 in. 



Weather. Mean Cloudiness observed, 63.9 percent; Xumber of Clear Days, 6; Number 

 of Cloudy Days, 13; Number of Fair Days, 12; Total Cloudiness recorded by the Sun 

 Thermometer^ 219 hrs., or 63 per cent. Number of davs ou which .01 inches or more rain 

 fell, 14. 



Briyht Siiiisliine. Number of Hours Recorded, 129. 



Menu Ozone, 33 per cent. 



Halos, Solar, 2d, 16th, 27th ; Lunar, 2d, 22d, 25th ; Lunar corona, 1st, 25th. 



I'll under and JAtjhtning, 4tli, 19th. Gales, 17th, 19th. 



Frost, 13th, 22d, 23d, 31st. Snow, 19th, a trace. 



Aurora, 15th, 17th. 



DAILY SUMMARY. 



Oct. 1 Barometer reduced to sea level, max. 30.315, min 30.21, mean 30.297. 



♦Temperature, max. 72.5", 78°, 3 p.m., min 48.5°, 43", 6 a.m., mean hourly fiO.l" 



Sun Thermometer, max. 125'^, 12 m., bright sunshine 11 1-2 hrs. 



Mean dew point 53.7", mean force vapor .6285, mean humidity 70.7. 



Wind, S.S.W., total movement, 61 m., mean hourly velocity 2.5 m., max. pres- 

 sure, 1-2 lb.=10m. per hour, 1-30 p.m. Ozone 30. 



2 Barometer reduced to sea level, max. 30.34, min. 30.215, mean 30.283. 

 Temperature, max. 69", 72", 1 p.ji., min. 45.5", 40°, 7 am, mean hourly 58.7''. 

 Sun Thermometer, max. 126°. 10.30 a.m., bright sunshine 6 hrs. 



Mean dew point 50.3"', mean force vapor .(!094. mean humidity 63.3. 

 Wind, S.S.W., total movement 48 m., mean hourly vel. 2 m., max. pressure 

 1-2 lb.= 10 m. per hour, 1-30 p.m. Ozone 10. 



3 Barometer reduced to sea level, max. 30.215, min. 30.05, mean 30.072. 

 Temperature, max. 66.5", 68.5°, 4 p.m., min. 53", 50", 6 a.m., mean hourly 60.1". 

 Sun Thermometer, max. 58°, 12 m., bright sunshine 0. 



Mean dew point .58.7°, mean force vapor .6127, mean humidity 82.7. 

 Wind, N.N.E., total movement 43 m.. mean hourly vel. 1.8 m., max. pres- 

 sure 3-4 lb. = 12 m. per hour, 11 a.m. Ozone 20. 



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



