BULLETIN No. 13. JANUARY, I 890 



METEOROLOGICAL OBSERVATORY 



OK THK 



Hatch Experiiiient Station, 



MASSACHUSETTS AGRICULTORAL COLLEGE, 



.A^IVlIEiEI^ST. 



Latitude, 42° 23' 18. o" N. Longitude, 72° ;^1' 10" W. 



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



MONTHLY SUMMARY. 



Vfeintiu'e. In inches. Actual maximum reading 30.(j4; ai-tuiil miiiimuiu rcaiUng ■iD.l'l : 

 Mean reduced to sea level, 30.191 ; Monthly Range, l..')0. 



Air Trmpernturi'. In Degrees Fahrenheit. Highest, at top ol tower, (U"^ ; at base of 

 tower, Gl ..5- ; Lowest, at top oV tower, 10" ; at l)ase of tower, i.n'^; Mean, 33.2-': Monthly 

 Range.')!"; Highest -Mean Daily, .')'2.3'^; Lowest Mean Daily, 1.5. 0''; ^Nlean Jfiiximuni. 40.ii^'; 

 Meaii Minimum, •21.1'^; Mean Daily Range, 19.6''; Greatest Daily Range, 34°. 



ITinnifUti/. Mean Dew Point, iS.S"^; Mean Force of Vapor, .'2042; Moan Relative Humid- 

 ity, 08.2. 



if'infl. Prevailing Direction, E.S.E.; Total ^Fovemeut, 4914 miles; Greatest Daily 

 Movement, 34.5 miles, 9th; Least Daily Movement, 26 miles, 12th; Mean Daily Move- 

 ment, 1.58.5 miles. Mean Hourly Velocity, 6.6 miles; Maximum Pressure per Square Foot 

 27 3-4 lbs. =74 m. per hour, 8th, at 3 p. M. 



Precipitntion. In inches. Total Pi-eoipitation, 2.37 in. ; at base of tower 2.61 in. 



Woather. ^lean Cloudiness observed, .52 per cent ; Number of Clear Days, 7; Number 

 of Clouilv Davs, 6; Number of Fair Days, 18; Total Cloudiness recorded by the Sun 

 Thermonieter,"l85 hrs, or 63 per cent. Number of days on which .01 inches or more rain 

 fell, 14. 



Bright Sunsliine. Number of Hours Recorded, 112 1-2. 



Snotf, Ish, Sth, 10th, 11th, 16th, 21st, 2.3rd, 27th. Total fall, in inches, 4 1-2. 



Sleet, 27th. 



Halos, Lunar, 4th, 5th. 



DAILY SUMMARY. 



Jan. 1. Barometer reduced to sea level max. 30.9-i, miii. 30.57, mean 30. 792- 



♦Temperature, max. 52", 52", 12 p.m., min. 25°. 24«, 2 a. m., mean hourly 30.7°- 



Sun Thermometer, max. 43°, 11 a.m., briffht sunshine 0. 



Mean dew point 30. 7*^, mean force vapor .2019. mean humidity 86.7. 



Wind, X.W., total movement, 39 m.. mean hourly velocity 1.0. m., max. pres- 

 sure, 2 2-3 ll)s.= 23 m. per hour, 10 p.m. Ad inappreciable fall of snow 

 during forenoon. Showers fi-om 2 p.m. to 9 p.m.. .02 inches water fell; at 

 base of tower, .03. Ozone 3. 



2. Barometer reduced to sea level, max. 30.54, min. 30.18, mean 30. 2«. 

 Temperature, max. 64", 61.5°, 2 p.m., min. 38°. 34°, 12 p.m., mean hourly 52.3°. 

 Sun Thermometer, max. 69*», 12.30 a.m., bright sunshine 0. 



Mean dew point 47.0°, mean force vapor .4471, mean humidity 72.0. 

 Wind, S.S.W., total movement 274 m., mean hourly vel. 11.4 m., max. pressure 

 11 1-2 lbs. =48 m. per hour, 4 p.m. Ozone (>. 



3. Barometer reduced to sea level, max. 30.G15, min. 30.29, mean 30.537. 

 Temperature, max. 41°, .50°, 1 a.m., min. 20°. 17°. 12 p.m., mean hourly 37.4°. 

 San Thermometer, max. 104°. 11.30 a.m.. bri<j;ht sunshine 2 1-2 hrs. 

 Mean dew point 22°, mean force vapor .2288, mean humidity 51.7. 



Wind, N.W.. total movement 244 m.. mean lionrly vel. 10.3 m., max. pres- 

 sure 8 1-2 lbs. =41 m. per hour. 1 a.m. Ozone 7. 

 *The first figures ilenote readin-is at top of tower, the second at base. 



