BULLETIN No. 1 6. ^- APRIL, J^890. 



METEOROLOGICAL OBSERVATORY 



OK THK 



Hatdi Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, . 



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



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



MONTHLY SUMMARY- 



Pressnve. In inches. Actual maxinuim i-eading 30.275; actual niininuim reading 29.215; 

 Mean reduced to sea level, 30.098; Monthly Range, LOG. 



*Air Temperature, In Degrees Fahrenheit. Highest, 7.5"; 79.5"; Lowest, 2G.5°; 22°; 

 Mean, 40. o'-' ; 45.8* ; Monthly Range, 4S.5'-', 57.5" ; Highest Mean Daily, 61", 61.5" ; Lowest Mean 

 Dailv, 35.9", 35.3"; Mean Slaximuni, 50.5", .59.5°; Mean Minimum, 36.3", 32.1"; Mean Daily 

 Range. 20.2«, 20.9"; Greatest Daily Range, 38"; 48..5". 



Hitmiilitt/. Mean Dew Point, 35.0"; Mean Foi-ce of Vapor, .3006; Mean Relative 

 Humidity, 04.7. 



Wind, Prevailing Directions, N. 14.4 per cent., N.N.E. 15.5 percent., S.S.E. 14. 4 percent., 

 N.W. 13.3 i)er cent., other directions 4!2.4 per cent. ; Total Movement, 5020 miles; Greatest 

 Daily Movement, 410 m. 5th; Least Daily IMovement, 89 m. 14th; Mean Daily Movement, 

 167.3 miles; Mean Hourly Velocity, 6.96 miles; Maximum Pressure per Square Foot 11 1-2 

 lbs.=48 m. per hour, 17th, at 3 p. M. 



Precipitation, In inches. Total Precipitation, 1.35 in. ; at hase of tower 1.73 in. 



Weather . Mean Cloudiness observed, 50.4 per cent ; Number of Clear Days, 17 ; Number 

 of Cloudy Days, 6; Number of Fair Days, 7; Total Cloudiness recorded by the Sun 

 Thermometer, "l51 hrs, or 48 per cent. Number of days on which .01 inches or more rain 

 fell, 9. 



Bright SunsJiine. Number of Hours Recorded, 245. 



Snotf, 8th. Total fall, in inches, a trace. Hail, a trace, 26th. 



Mean Ozone, 35.3 per cent. 



JSalos, Solar, 21st; Lunar, 2d, 3d, 29th. Lunar coronae, 5th, Oth, 7th. 



Frost, 8th, 12th, 10th, 19th, 20th, 21st, 20th, 29th. 



DAILY SUMMARY. 



Apr. 1. Barometer reduced to sea level max. 30.48, min. 30.25, mean 30.323. 



^Temperature, max. 43", 42.5°, 5 p.m., min. 31°, 28«,5a.m., mean hourly 35.9". 



Sun Thermometer, max. 112'', 8 a.m., bright sun.shine 7 1-2 hrs. 



Mean dew point 28.3", mean force vapor .2078, mean humidity 79.3. 



Wind, N.W., total movement, 161 m.,mean hourly velocit_y 6.7m., mas. pres- 

 sure, 7 lbs. =37 m. per hour, 12-30 p.m. Ozone 3. 



2. Barometer reduced to sea level, max. 30.575, min. 30.38, mean 30.48. 

 Temperature, max. 49", 50.5°, 5 p.m., min. 27. 5", 22. 5°, 5 a.m., mean hourly 38.4°. 

 Sun Thermometer, max. 123.5°, 9 a.m., bright sunshine 10 1-2 hrs. 



Mean dew point 26.3°, mean force vapor .2511, mean hmnidity 58.7. 

 "Wind, N.W., total movement 119 m., mean hourly vel. 4.9 m., max. pressure 

 4 1-2 lbs. =30 m. per hour, 3 p.m. Ozone 3. 



3. Barometer reduced to sea level, max. 30.38, min. 30.075, mean 30.227. 

 Temperature, max. 67", 70°, 4 p.m., min. 37°, 30°, 1 a.m., mean hourly 51.1°. 

 Sun Thermometer, max. 150", bright sunshine 10 hrs. 



Mean dew point 34.7°, mean foi'ce vapor .4726, mean humidity 50.3. 

 "Wind, S.W., total movement 132 m., mean houi'ly vel. 5.5 m., max. pressure 

 2 1-2 lbs. =22 m. per hour, 3-30 p.m. Ozone 1. 



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



