BULLETIN No 23. NOVEMBER, 1890. 



METEOROLOGICAL OBSERVATORY 



()!• IIIK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



^^IvIiiEE-ST. 



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



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



MONTHLY SUMMARY. 



Fressure. In inches. Actual inaxinuini reading 30.06; actual niininuuu reading 29.08; 

 Mean reduced to sea level, 30.007; Monthly Range, .98 in. 



*Air Temperature. In Degrees Fahrenheit. Highest, .^T"; 62.. o"; Lowest, 16"; 11.5"; 

 Mcan,38-^ .-{T.i^-'; Mouthlv Range. 41", .51'^; Highest Mean Daily, 49.4'^, •IS.S"'; Lowest Mean 

 Daily, 22.1-'. ■•1.5>'; Mean "Maxiinum, 44.4'^, 47.3'^; Mean Minimum, 30.8'^, 26.6'^; Mean Daily 

 Range. 13.7, 20.7'^; Greatest Daily Range, 23.5''; 34'-'. Least Daily Range, 2. .5"^; Ln-^. 



Htimhlitif. Mean Dew Point, 29.7-'; Mean Force of Vapor, .2606; Mean Relative 

 Humidity, 67 8. 



Wind. Prevailing Dii-ections, N. 22 per cent., S. 13 per cent., N.W. 9per cent., S.W. 

 8 per cent., other directions 48 per cent.; Total Movement, 4228 miles; Greatest Daily 

 Movement, 297 m., 20th ; Least Daily Movement, 26 m. 15th : Mean Daily Movement 140.9 

 miles; Mean Hourly Velocity, .t.9 miles; Maximum Pressure per Square Foot, 9 1-2 lbs. 

 =44 m. per hour, 23d, at 10-30"a. m. 



I'rerij)it(ition. In inches. Total Precipitation, 1.19 in. ; at base of tower 1.32 in. 



Weather. Mean Cloudiness observed, 47 percent; Numberof Clear Days, 10; Numl)er 

 of Cloudy Days, 9; Number of Fair Days, 11; Total Cloudiness recorded by the Sun 

 Thermonieter, 159 hrs., or 53 per cent. Number of days ou which .01 inches or more rain 

 fell, 7. 



Br'ujht SunslUne. Number of Houi-s Recorded, 143. 



Snoir, 11th, 22d, 23d. Total fall in inches, 1 3-8. Hail, 11th. 



Mean Ozone, 28 per cent. 



Halos, Solar, 4th, 7th, 1.5th; Lunar, 2Dth; Lunar corona, 22d, 23d, 24th, 26th, 27th, 28th. 



Gales, 18th, 19th, 23d. 



Aurora, 7th, 13th. 



DAILY SUMMARY. 



Nov. 1. Barometer reduced to sea level, max. 30.00, mill 29.895, mean 29.947. 



♦Temperature, max. 47", 49.5°, 12 m., min 33°, 26*, 5 a.m., mean hourly 40.5° 



Sun Tliermometer, max. 92"", 12 m., brig-lit suusliine 2 hrs. 



Mean dew point 30.7°, mean force vapor .2767, mean humidity 63.7. 



"Wind, S.W., total movement, 110 m., mean hourly velocity 4.6 m., max. pres- 

 sure, 2 1-2 lbs. =22 m. per hour, 2-45 p.m. Ozone 10. 

 2. Barometer reduced to sea level, max. 29.965, min. 29.69, mean 29.798. 



Temperature, max. 46°, 48°, 4 p.m., min. 40°, 37°, 5 a.m., mean hourly 43.4°. 



Sun Thermometer, max. 26°, 2 p.m., bright sunshine 0. 



Mean dew point 39.7°, mean force vapor .3277, mean humidity 74.7. 



Wind. S.W., total movement 92 m., mean hourly vel. 3.8 m., max. pi-essure 

 3 1-4 lb.= 25 m. per hour, 1-30 a.m. Rain began falling about 2 a. m. and 

 ceased about 8-30 a. m. .05 in. water fell; at base of tower .07 in. 

 Ozone 50. 

 3 Barometer reduced to sea level, max. 29.735, min. 29.69. mean 29.718. 



Temperature, max. 46°, 49°, 11 a.m., min. 33°, 29°. 12 p.m., mean hourly 40.8°. 



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



