468 



Talilc xhowiufj the average tnonthhj inaximnm. mean, and m'niimnni tctnj>iratu res at the 

 Heather linrean stations in the Jllack Hills and the mean ttniperalnre at four .ttaiions 

 on the siitrnnndinij 2>lains. 



Year. 



Tempera- 

 tun-. 



Jan. Feb. Mar. Apr. May. Jnne.l July.! Aug. Sept 



Dt-ailwiiod. S. Dak. 

 (altitude, 1.411 

 iiu'tersi. 



RapiilCitv S. Dak. 

 (altitude, 973 iiie- 

 tt-rs). 



Fort Mead.-. S Dak. 

 (altitude DlStur- 

 t;is, 1.(1.")" uifters). 



Fort It oliiii SOD. 

 Xelir. (altitude, 

 l.l.'id lueters). 



Sidney. Nebr. (alti- 

 tude, l.'J-kS lue- 

 tersi. 



Fort Fetteriuan, 

 Wyo. 'altitude, 

 ].5i2 lueters). 



J'ort KeojErli. Mont, 

 (altitude 7".'l me- 

 ters). 



) {Maxiniuni .. 5- 57 



Sl87K-)^7 JMean 21 S-i 



) (Miuiuiuiii.. . — 17 — 16 



iiQQi 09 iMaxiunini.. 57 CO 



(1888-91 >V!^^" fa -w 



) fMiiiiinuin.. .| —18 — 2.J 



) tMaxiiuuui ..' 53 I 02 



^1879-91 'Mean ; 18 21 



) rMiuiniuui... — 22 —25 



'-1883-91 Mean 21 , 24 



IS? :^I-='" • 211 26 



I ! 



(1868-82 f^. „ ; ^ 



I 1890-92 s •"^•'" "* I ^ 



[ 1878-92 Mean U 10 



64 

 32 

 3 

 69 

 33 



2 



68 

 31 



-6 



34 



32 



32 



r,o 



27 



84 



53 



27 



85 



54 I 



27 



57 ; 



91 

 05 

 44 

 99 

 71 

 40 

 98 

 71 

 45 



73 



91 

 65 

 41 



100 

 71 

 45 



100 

 70 

 41 



74 i 70 

 74 ' 72 



I niaximuni 

 west 

 niininiuni. ! 



Arer- Great- 



age est 

 raisge. range. 



Deaihvood, S. Dak. ,) i.Maxinii 



(altitude.1,411 1^1878-87 jMeau-. 



uietersi. J (Minimi 



RajiidCitv, S. Dak. ) ,ao, gn iMaxii 



(altitude. 97:! me- >lSaio, 'Mean 



ters). ^18«8-.tl ^,^,j|j 



Fort.Meade.S.Dak. ) 



(altitude of ."-"tur- i [.187'.MJ1 



gi.s. 10.i7 meters). ) 



Fort Ko I) i n son, ' ) 



Nel.r. (altitfde, [■ ISS.Vitl 



l.mu meters). |) 



Sidney, Xel»r.(alti- ) ,a-.,_Qft 



tude, 1.248 uie- / aorxV 



Fort Feltprnian, 

 Wyo. (altituile, 

 1, .">12 meters). 



Foi t Keoyli, Mont, 

 (altitude-. 721 me- 

 ters) . 



1S68-82 

 (| 18!Hi-92 



iMaxinium 

 \\Iean 



'Mean 



l.><7.><-92 Mean.. 



From tlic ;u-c-oiiii>aiiyiiiii table, also an alt.stract from tlie AVcalher 

 liiircau records, but with tlic Iractions omitt«*<l. it can be seen tliat the 

 average temperature of the stations at the base is about the same as 

 that f>f the surrouiMliii.i; jjlains. At Deadwood it is a few dej^rees lower, 

 a decrease of about 1 tle^ree fi»r each 100 meters increase of altitude, 

 and very likely in th«' higher liills tlie a\(Ma.i:e temperature is mueb 

 lower. Tiie maximum heat is reached in August, the average being 

 HKP F. in the Ibothilis and UP V. at Deadwood, but sometimes reach- 

 ing higher, as seen in the table. The minimnm is reached in Febrnaiy 

 or January, being —2.") and — L'3 degrees in the foothills, but only —17 

 degrees at l)e;nhvood, jnobably on acc<»unt of the more ])roteeted local- 

 itv. 'I'he average ditleieiiee Ix'tween tlie maximum and niiniinum in a 



