BULLETIN No- 19. JU LY, 1890. 



METEOROLOGICAL OBSERVATORY 



OF riiK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE,' 



Ltititmlo, 42° 23' 48. ,V' N. Louoiiude, 72° 31' 10" VV. 



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



MONTHLY SUMMARY. 



I'ressiire. In inclics. Acliiiil niaxiiiuini rcailinf? 2!).i)!S; .■ictiial miiiinniin rcadinj;- '20.:?7; 

 Mean reduced to sea level, .iO.dli); IMoiitlily Halite, M in. 



*.liv 'IVnipfrtttiiri', In Heg-rees Kalirenlieit. Hij^licst, 9-2^; ill"; Lowest, 47"; 40"; 

 Mean, li'.i.S'; (iS.4"; Monthly Kaii'jrc, 4")«, .')4"; llij<liest Mean Daily, sO'", 8]^'; J.owest Mean 

 Daily, .')!!.(!", .">.">'; Alean Maxinium, "9.3", S\.-2-': Mean Aliriiniiin'i, 5!).:!", i5r).(i-"; Mean Daily 

 liange. -20.1", '.>.').()"; (ireatest. I>aily llangc, .'!-2" ; :!()..'')". Least Daily llange, 4.5" ; 8..'>". 



Itiniihlit!/, Mean Dew Point, (il.iV; Mean Kore.e ol' Vapor, .8'i'2!); Mean Relative 

 iluniidity, 70 1. 



H'hnl. Previiiliiij; Directions, S. S. W. '20 per cent., S. 17 per cent., S.W. 15 per cent., 

 N. per cent., other dire(;tions ;5!) per cent.; Total Movement, .'{!)7H miles; Greatest 

 Daily Movement, i;(;5 ni., ;id; Least Dally IN[ovenieut, .'52 m. '2iith ; Mean Dally Movement, 

 1-2S.2 miles; Me;in Hourly Velocity, 5.3 miles; Maximum I'ressun! ])(!r Square Foot, ilj 

 ll)s.=44 m. pel- hour, I'.Hh', at 3 l'. M. 



Frecij>itation. In inches. Total rrceipitatlon, 5. '2:! in. ; at base of tow<!r 5.03 In. 



Wfiithrr. Mean (Cloudiness observed, .50 percent; Numberof Clear Days, 18; Number 

 of Clourly Days, 3; Nnmber of Fair Days, 10; Total Cloudiness recoi'ded by the !Siiu 

 Tliermouieteri 101 lirs., or ;!Operc,eul. Nuinlier of da v« on which .01 inches or more rain 

 fell, !l. 



lii'iijlit Sunshine. Number of Hours Hecorded, 280. 



Hnil, a trace, lOth. 



Mean Ozone, .50.0 per cent. 



Ifalos, Solar, '27, 28; Lnnar, 2Sth. Northern Lights, 17th. 



ThitHde.r and Lightning, 4th, 7th, 17th, 19th, '2Gth, 30th, 31st. 



DAILY SUMMARY. 



Jnlv 1 . Bavomctci' rediiced to sea level, max. 2i).98, iiiiii. 29.91, mean 29.948. 



*'reiii|)('vatiire, max. 87'^, 89..')'', 2 p.m., min. 02°, .59'^, r, a.jni, mean lionrly 74.8°. 



Snii 'riieniiometer. max. 14.5'-', 1 p.m., brii^lit sniisliiiie 12 hrs. 



Mean dew point (!(!.7'^, mean force vapor 1.0137, mean linmiility '!S. 



Wind, S., total movement, i;52 m., mean hourly velocity 5.. 5 m., max. pres- 

 sure. 2 1-4 lbs. =21 m. jier lionr, 4-30 p.m. Ozone 40. 



2. Harometer reduced to sea level, max. 29.9.5, nun. 29.875, mean 29.92. 

 Temperature, max. 75. 5'-', 79. 5", 11 a.m., min. G5''',(!3.5'', 4 a.m., mean lionrly 70.+'' 

 Snn 'riiermometer, max. 112°, 10 a.m., briiiht snnsliine 2 Iirs. 



Mean dew jioint (i8'-', mean force vapor .8900, mean liiunidity 77.3. 



Wind, S. S.W., total movement 219 m., mean lionrly vel. 9.1 m., max. pressure 



5 ll)s.= 32 UK per hour, 3 p.m. Lisjlit showers of rain fell between ('. p.m. 



and 8 P.M. Oidy a trace of water fell. Ozone (JO. 



3. P.arometer reduced to sea levc^l, max. 29.875, min. 29.77, mean 29.782. 

 Temperature, max. 70.5", 73.5", 1 p.m., min. 6(!",r>5'', 2 a.m.. mean hourly (58.1°. 

 Sun Tiierinometer, max. fi3°, 1 p.m., briiiht sunshine 0. 



Mean dew poiid, fuS", mean force vapor .77(12, mean iiiiinidily 87.7. 



Wind, S., total movement 205 ni., mean hourly vol. II in., max. pressure 



5 ll)s.=32 111. per hour, 12-:'>0 i-.M. Liiilil sliowers of rain fell between 5 a. 



M. and 8 i-.m. Ozone 50. 



*The lirst ligiircs denote; readings at lop of tower, the second at base. 



