468 
Table showing the average monthly maximum, mean, and minimum temperatures at the 
Weather Bureau stations in the Black Hills ‘and the mean temperature at four stations 
on the surrounding plains. 
aa a. | | | | | | 
Station. ‘Year. Pempera Jan. | Feb. Mar.) Apr. May. ‘June. July. Aug.| Sept. 
. | | | | | | 
_ a - | | I— - 
| ) ) fe) oO | oO | Oo | o re) Oo, 
Deadwood, 8. Dak. (Maximum .- 2 57 64, 70 77 | 89 91 91 82 
(altitude, 1,411 | ‘aoe 87 <Mean.....-- | 21 23 0—CiC« BB] C40 | 50) 60 65 65 54 
meters), UMinimum... —l7 —16 3 WG 7 39 | 44 41 31 
Rapid City, 5. Dak. 881-83 jMaxtimum .-) 57 60 69 82 | 84 95 99 | 100 94 
(altitude, 973 me- t ‘ lean ....--. | 20 | 22 33 46 53 64) 71 71 61 
ters). 1868-91 Vtininiim. 18 23 2) 4s) B71) 4645 |B 
Fort Meade, S.Dak. i" (Mi aximim .. 53 62 68 80 85 94 98 100 91 
(altitude of Stur- 879-91 <Mean......- 18 21 31 44 5B 65 71 70 59 
gis, 1,057 meters). ' (Oe —22 25 —6 | 15 | 2700 89) 45 31 
Fort Robinson, | | 
Nebr. (altitude, las Mean -...---- 21 24 34 | 48 | 57 67 73) 70 61 
1,150 meters). i | | | | 
Sidney, Nebr. (alti- 872-80 | | | | | 
tude, 1,248 me- - ‘tenn a -e 21 260 32, 43.0 «58 )) «667370 59 
tera) 1886-91 | | 
Fort Fetterman, 
W yo. (altitude, a ee eatean coe (ag og | 33 | 43 | en er 
1,512 meters). | | | 
Fort Keogh, Mont. | | | | | | 
{altitude, 721 me- brs | 92 | Mean.....-. 11 | 16 32 | 47 | 56 67 | 740 72 60 
ers). 
| | | 
| | | _ 
= | 3 Niehe — = 
| che st maximum 
| Aver. and lowest , 
: . Tempera. | . | age minimum, Aver. Great- 
Station. Year. | tur |Oct. Nov. Dec.) ane | age est 
ure. ‘nual range. range. 
De 
MCAD. noes Date 
| 
_ | —_—__—_|- _ 
ui ») oO c 
Deadwood, 8S. Dak. ) | Maximum... 74 62 54... 102 | July, 1881 
(altitude, 1411 $1878-87 2Mean..-.... 44, 35 838) 42 Le weleccecceeees { 8 134 
meters). § UMinimum.. | 18 -] 1B fol... —32 | Feb., 1883 | 
Rapid City, 8. Dak. |) 99) 95 j Maximum --| 78. TL 64 022... 106 | July, 1881 
(altitude, 973 me- bee <Mean....--. 48 34 381 Ce ; 123 146 
ters). ~* ¢Minimum...) 22 on | 40 | Feb., 1883 | 
Fort Meade,S. Dak. ? {Maximum ..| 80 68 1 108 | July, 1881 ) | 
(altitude of Stur- 1879-91 <Mean...-.-. 48 33 24 45 eee eee ee eee 125 | 145 
gis, 1,057meters). 5 Minimum. ..) 16 5 —13 \....-- —37 | Dec., 1887 5 | 
Fort Robinson, ? | | | 
Nebr. (altitude, BR ~91 ) Mean....--- 19 36 29 er es ee 
F a Si | 
sidney, Nebr, alti Dist 80 | ; | | | | | | 
tude, 1,248 me- f 1886 1 ; Mean seeeeee| 47 33) 24 eee 
ters). | | | | 
Fort Fetterman, | | | | 
Wyo. (altitude, || 1808. a Uvfean beeeeee | 45 33 | 25 0 Pe eee 
1,512 meters). ) | | 
Fort Keogh, Mont. | | | | | 
(altitude, 721 me- srw | Mean....... 46 | 31 19 44 | wee eeeee | wewececeeee es 
ters). | | 
From the accompanying table, also an abstract from the Weather 
Bureau records, but with the fractions omitted, it can be seen that the 
average temperature of the stations at the base is about the same as 
that of the surrounding plains. At Deadwood it is a few degrees lower, 
a decrease of about 1 degree for each 100 meters increase of altitude, 
and very likely in the higher hills the average temperature is much 
lower. The maximum heat is reached in August, the average being 
100° F. in the foothills and 91° I. at Deadwood, but sometimes reach- 
ing higher, as seen in the table. The minimum is reached in February 
or January, being —25 and —23 degrees in the foothills, but only —17 
degrees at Deadwood, probably on account of the more protected local- 
ity. The average difference between the maximum and minimum in a 
