BULLETIN No. 14. FEBRUARY, ( 890 



METEOROLOGICAlT OBSEHVATORY 



OK TIIK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42" 23' 48. 5" N. Longitude, 72° 31' 10" W. 



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



MONTHLY SUmMARY. 



Pt'e.isiire, In inches. Actual maxiniiini reading- 30.42; actual iniuiniuin i-eadiug 29.08; 

 Mean reiiuced to sea level, 30.097; Monthly Range, 1.34. 



Air Tpinperntitfc. In Depfrees Falirenheit. Highest, at to)) of tower, 'u.^°\ at hase of 

 tower, .'57..')"'; Lowest, at top of tower, 7"; at base of tower, 3^; Mean, 31.7'^; S'J.O''; Monthly- 

 Range, .')0..")"; Highest Mean Daily, 4-2.7''; Lowest Mean Daily, 11.9'-"; Mean Maxinnnn, 40.7'^; 

 Mean Minimum, 21. <>'-'; Mean Daily Range, 16-^; Greatest Daily Range, 29°. 



ETinniiliti/. Mean Dew Point, 25.2'^; Mean Force of Vapor, .2017; Mean Relative Huniiil- 

 ity, 74.8. 



Whiff. Prevailing Direction, N. \V.; Total Movement, 4616 miles; Greatest Daily 

 Movement, 340 m. 21st; Least Daily Movement, 18 ni. 2.')th ; Mean Daily Movement, 164.9 

 miles; Mean Hourly Velocity, 6.8 miles; Maximum Pressure per Square Foot 17 1-2 lbs. =.59 

 m. per hour, .ith, at 3 p. m. 



Precipitfitioii. In inches. Total Precipitation, 3. .'55 in. ; at base of tower 4.19 in. 



Wontlier. Mean Cloudiness observed, 66 per cent; Number of Clear Days, 11 ; Number 

 of Clou<ly Days, 14; Number of Fair Days, 3; Total Cloudiness recorded by the Sun 

 Thermometer," 17.T hrs, or 57 per cent. Numi)er of days on which .01 inches or more rain 

 fell, 14. Depth of snow, in inches, on ground at close of month, 0. 



Brii/lif SuiisJiiii.e. Number of Hours Recorded, 131. 



Snoif, 2nd, 8th, lotli, 17th, 20th, 23rd. Total fall, in inches, 5. 



Ni'fiu Ozone, 3.4. 



Halos, Lunar, 1st, 6th. Solar, 17th. 



DAILY SUMMARY. 



Jan. 1. Barometer redncecl to sea level max. 30. (Jl, miu. 30.10, mean 30.43. 



♦Temperature, max. 39. 5*^, 38.5°, 11 a.m., min. 20", 19", 12 p.m., mean hourly 34.. 5°. 



Sun Thermometer, max. 69^, 1 p.m., bri.£>-ht sunshine 1 hr. 



Mean dewpohit 23.7", mean force vapor .2051, mean humidity 63.0. 



Wind, W., total movement, 203 ra., mean liourly velocity 8.5. m., max. pres- 

 sure, 5 lbs.= 32 m. per hour, 3 p.m. Ozone 5. 



2. Barometer reduced to sea leyel, max. 30.695, min. 30.40, mean .30.565. 

 Temperature, max. 36", 33.5", 2 p.m.. min. 20", 19°, 7 a.m., mean hourly 27.9". 

 Sun Thermometer, max. 50", 12 m., bright sunsliine 0. 



Mean dew point 23.7", mean force vapor .1728, mean liumidity 78.7. 



Wind, W., total movement 130 m., mean hourly vel. 5.4 m., max. pressui'e 



2 lbs. =20 m. per hour, 1.30 a.m. Began snowing al)ont 6p. m. ; turned into 



rain during the niglit. (Jzone 4. 



3. Bai'ometer reduced to sea level, max. 30.39, min. 30.01, moan 30.09. 

 Temperature, max. 52", 48.5°, 9 p.m., min. 30", 27.5", 1 a.m., mean hourly 37.0". 

 Sun Thermometer, max. 75°, 2.30 p.m., bright sunshine 0. 



Mean dew point 36.7°, mean force vapor .2671, mean humidity 84.3. 



Wind, E.N.E., total movement 59 m., mean hourly vel. 2.5 m., max. pres- 

 sure 9 1-2 lbs. =44 m. per hour, 8-30 p.m. Stopped raining about 12 m. .06 

 inches water fell; at base of tower, .07 inches. Ozone 5. 



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



