BULLETIN No. 7. JULY, 1889. 



METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 4H.5" N. Longitude, 72° 31' 10" W. 



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



MONTHLY SUMMARY. 



freasHre. In inclies. Actual maximum reading 30.070; actual minimuiii icailintr -'it.SHO; 

 Mean reduced to .W F., SO.Cdi); jMontlily Kange, .(iOO. 



Air Tenijtcrntiire. In Degrees Kaluenheit. Highest, 84.0^; Lowest, 54.0"; Mean, OO.r)"; 

 Montldy liange, 30.0-' ; Highest Mean Daily, 7o.'2^'; Lowest Moan Daily, (>0.3>-'; Mean Maxi- 

 mum, 77.1-'; Mean Minimum, (W.O-; Mean Daily Uauge, 15.2^; Greatest Daily Range, 28.0'^. 



Huni-idit!/. Mo:u\ Dew I'oint, 02.7'^; Mean Force of Vapor, .,'5892; Mean Relative Humid- 

 ity, 78.2'''. 



Wind. Prevailing Direction, SVV.; Total Movement, UK^i miles; Greatest Daily Move- 

 ment, 272 utiles, Jrd; Least Daily Movement, 45 miles, 7th; Mean Dally Movement- 

 i;}0 miles. Mean Hourly Velocity, 5.4 miles; Ma.ximum Pre.ssure per Square Foot, 10 lbs. 

 =45.0 m. per luiur, lOth, at 11 i'. M. 



Precipitation. In inches. Total Precipitation, 7.55; at l)ase of tower 9.00 in. 



Weather. Mean Cloudiness, on a Scale of 10, 5.4; Number of Clear Days, 8.; Numljcr 

 of Clouily Days, 18; Number of Fair Days, 5; Tt)tal Cloudiness recorded by the Sun 

 Thermometer, 2ti5 hrs, or .59.:! per cent. Number of days on which .01 or more rain fell 15. 

 Winds followed by rain 29th. 



/{right Sunshine. Number of Hours Recordeil, 182. 



Thunder and Lightning, 7th, 8th, 23rd, 29th and 30th. 



Meteors, 18th. ^ 



DAILY SUMMARY. 



JcLY 1. Bai-omfter rcduciHl to 82° F., max. 20.!)4r,, iiiiii. 2!».S5.S, mean 2!>.!)1S. 

 Temperatm-f. max. H-t'', 4 v. m., min. 71°, >"> \. .m., mean liouvly 70.3°. 

 Sun 'riuTiiiomctfi-, max. 107°, II a. m., bright sunshine 12 hrs. 

 Mean (h-w point 70. (i", mean foreo vapor .74;>7, mean humidity S2.;5''. 

 Wind, S\V., total movement. Ki'i ni.. mean hourly vehx-ity 'A.'.f 

 m.. max. iiri'ssurc, :?-4 lbs. = 12 m. per hour, 4 p. m. Ozone 2. 



2. Baromctei- n;(hiced to 32° F.. max. 29.!t4(;. min. 2i).s;5!», mean 21t.8S)3. 

 Temperature, max. 75°. 12 m., min. 70°. 4 .\. M., mean liourly 72. C. 

 Sun Thei-mometer. max. .s;5°. 11 v. M.. l)i'iiiht sunshine 2 hrs. 

 Mean (lew point (IS. ()>^. mean force vapor .t;!*!!."). mean immidity ,S(;.:5-'. 

 Wind. S.. total movement lof) m., mean hourly vel, .")..") m., max, 



pressure 2 1-2 lbs. ,=22 in. per hour, 2-4;") r, .m. Slunvers after- 

 noon and niiiiit, ,s in. water fell, at base of tower 1.01 in. Ozone 

 1. 



3. Harometer re(lnced to ;!2" F.. max. 2'.>.s;;;(, min. 2",i..'.(;k, mean 2'.».(180. 

 Temperatui-e. max. 7t;°, 3 i'. m., min. C'.'^'. :'. a. m., mean hourly 71. i)°. 

 Sun Tliermonieter. max. .57°. 11 a. m., briiiiit sunsliine hrs. 

 Mean dew point 71.0°, mean force vapor .7r>7(;. mean humidity ',»,>. (;°. 

 Wind, SW.. total movement 272 m., mean hourly vel. 11.3 m., 



max. pressure 3 1-2 lbs, =20 m. i)er hour. 10-30 p. m. Showers 

 ended 12 .vi. .05 in. water fell, at base of tower ,03 in. Ozone 5, 



