BULLETIN No. 15. MARCH, 1890 



METEOROLOGICAL OBSERVATOEY 



OK THE 



Hatch Expcriiiieiit Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' is. 5" N. Longitude, 72° 31' 10" VV. 



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



MONTHLY SUMMARY. 



I'ressure, In inches. Actual maxinuun reading 30.25; actual miniumni reading 29.185; 

 Mean reduced to sea level, 29.993; Monthly Range, 1.065. 



Air Ti-mppriiture. In Degrees Fahrenheit. Highest, at top of tower, 62°; at base of 

 tower, ()•_'..■)", I-i>west,at top of tower, 2'^; at ba.'^e of tower, -6. 5"^; Mean, 31. 9'-^; 3L0"; Monthly 

 Range. 60^; Iligliest Mean Daily, 48.6''; Lowest i^Iean Daily, 13^'; Mean Maxiniuni, SS.?"-"; 

 Mean Mininiuni, 25.2-^; Mean Daily Range, 13.2'=.; Greatest Daily Range, 33". 



Ilumiilitii. ilean Dew Point, 26.5'=; Jlean Force of Vapor, .2007; Mean Relative 

 Humidity, 77.3. 



U'intl. PreviUling Direction, N. ; Total Movement, 5395 miles; Greatest Daily Movement 

 359 m. 2d; Least Daily Movement, 28 m. 15th; Mean Dail.v Movement, 174 miles; Mean 

 Hourly Velocit.v, 7.3 miles ; Maximum Pressure per Square Foot 13 1-2 lbs.^55 m. per hour. 

 2d, at 7 p. M. 



Pfecipitntion. In inches. Total Precipitation, 4.32 in. ; at base of tower 5.37 in. 



Wi'dthci'. Mean Cloudiness ol)served, !!6 per cent; Number of Clear Days, 9; NumbQji' 

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

 Thermometer,"20G hrs, or .>6 per cent. Number of days on wliicli .01 inches or more rain 

 fell, 17. Depth of snow, in inches, on ground at close of month, 1-2 in. 



Brit/lit Sunshine. Number of Hours Recorded, 160. 



Snow. 1st, 2d, 3d, 5th, 6th, Utii, 15tli. 19th, •22d, '23d, 25th, 28th, 29th, 31st. Total fall, in 

 inches, 17. 



Menu Ozone, 41 per cent. 



Halos, Lunar, 4th, 5tli, 24th, 29th. 



Thunder Stor)n, 28th. 



DAILY SUMMARY, 



Mar. 1. Barometer reduced to sea level max. 29.-89, min. 29.81, mean 29.848. 



♦Temperature, max. 38«, 39", 1 a.m., min. 28", 30«, 12 p.m., mean hourly 34.9°. 



Sun Tliermoraeter, max. 48"', 12 m., brijsjht sunshine 0. 



Mean dew point 28.3'^, mean force vapor .2158, mean humidity 73.0. 



Wind, N.W., total movement, 170 m., mean hourly velocity 7.1. m., max. pres- 

 sure, 3 2-3 lbs. =27 m. per hour, 2-15 p.m. Stopped raining at 9 a.m. .08 in. 

 water fell; at base of tower, .10 in. Trace of snow during night. Ozone 5. 



2. Barometer reduced to sea level, max. .30.00, miu. 29.89, mean 29.988. 

 Temperature, max. 31.5'', 32°, 1 a.m.. min. 20"^, 18°, 11 p.m., mean hourly 23.0". 

 Sun Thermometer, max. 35°, 8 a.m., bright sunshine 0. 



Mean dew point 13.3°, mean force vapor .1178, mean humidity 71.0. 

 Wind, N., total movement 359 m., mean hourly vel. 15 m., max. pressui'e 

 13 1-2 lbs. =52 m. per hour, 7 p.m. Ozone 1. 



3. Barometer reduced to sea level, max. 30.19, min. 29.89, mean 30.028. 

 Temperature, max. 30°, 30.5°, 5 p.m., min. lf)°, 13.5°, fi .v.m.. mean hourly 22.0°. 

 Sun Thermometer, max. 100°. 2. p.m., bright sunshine 11 1-4 hi's. 



Mean dew point 15.7°, mean force vapor .1243. mean liumidity 75.3. 



Wind, N.N.W., total movement 310 ni.. mean hourly vel. 12.9 m., max. pres- 

 sure 7 1-4 ll)s.=38 m. per hour. 7 a.m. 1 1-2 in. snow fell during early morn 

 which when melted gave .11 in. water. Ozone 5. 

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



