EXPERIMENTS WITH KHERSON AND SIXTY-DAY OATS. 37 
Newell, Cottonwood, Eureka, and Highmore, S. Dak.; North Platte, 
Nebr.; Archer, Wyo.; and Akron, Colo. 
The climate of this section is generally semiarid. It is charac- 
terized by low precipitation and high summer temperatures. Table 
XXV shows the altitude, the normal annual and seasonal precipita- 
tion, the mean temperatures for June, July, and August, and the gen- 
eral soil type at each of the 13 stations included in the section under 
consideration. 
Table XXV. — Altitude, average annual and seasonal precipitation, mean seasonal 
temperatures, and general soil types at 13 experiment stations in the northern Great 
Plains area. 
[The circled figures in columns 6, 7, and 8 indicate the number of years during which the data were recorded 
when such period was less than the number of years indicated in column 3.] 
Alti- 
tude. 
Climatological data. 
Station. 
Length 
of 
record. 
Average pre- 
cipitation. 
Mean temperature 
( C F.). 
General soil type. 
An- 
nual. 
Sea- 
sonal.* 
June. 
July. 
Au- 
gust. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
Feet. 
4,228 
1,875 
2,543 
1,750 
1,615 
1,468 
2,950 
2,414 
1,884 
1,890 
2,826 
6,027 
4.560 
Years. 
19 
33 
25 
2 34 
311 
4 17 
7 
7 
22 
35 
5 39 
13 
Inches. 
16.82 
14.90 
15.85 
17.50 
16. 83 
20.25 
13.98 
15.54 
16.43 
16.75 
18.74 
13.80 
19.13 
Inches. 
10.94 
10. 43 
11.19 
11.71 
11.09 
13.82 
8.68 
9.04 
8.71 
10.66 
11.14 
7.92 
11.90 
©58.0 
<§)63.0 
@61.0 
63.4 
©63.0 
(§)68. 6 
©68.1 
69.3 
©63.0 
@66. 8 
©67. 2 
67.6 
Dark clay loam. 
Fine sandy loam. 
Clay loam to fine sandy 
loam. 
Sandy loam. 
Black clay loam. 
Light sandy loam. 
Sticky clay (Pierre). 
Do. 
Williston, N. Dak 
Dickinson, N. Dak 
Mandan, N. Dak 
Langdon, N. Dak 
Edgeley, N. Dak 
Newell, S. Dak... . 
65.0 
72.0 
69.0 
Cottonwood, S. Dak. . . 
Eureka, S. Dak.. 
Glaciated sandy loam. 
Glaciated clay loam. 
Loess. 
Medium sandy loam 
with some gravel. 
Sandy loam. 
Highmore, S. Dak 
North Platte, Nebr 
67.7 
@68.0 
61.0 
©65.0 
72.9 
©72.2 
67.0 
©71.0 
71.4 
@72. 1 
65.9 
©69.0 
Akron, Colo 
1 For months of March to July, inclusive, at Akron, Colo., and Newell, S. Dak.; April to July, inclusive, 
at Archer, Wyo., and North Platte, Nebr., and April to August, inclusive, at Mandan, Edgeley, Dickinson, 
Williston, and Langdon, N. Dak., Cottonwood, Eureka, and Highmore, S. Dak., and Moccasin, Mont. 
2 Data recorded at Bismarck, N. Dak., about 4 miles east of Mandan; altitude at Bismarck, 1,674 feet. 
3 Data recorded at Woodbridge, about 24 miles northwest of Langdon. 
* Data recorded at Berlin, about 12 miles east of Edgeley; altitude at Berlin, 1,470 feet. 
6 Data recorded at Cheyenne, Wyo., 8 miles west of Archer; altitude at Cheyenne, 6,088 feet. 
As shown in Table XXV there is much variation in the altitude at the 
different stations. Edgeley, N. Dak., is the lowest, with an elevation 
of 1,468 feet, and Archer, Wyo., the highest, with an elevation of 
6,027 feet above sea level. 
The average annual precipitation does not exceed 21 inches at any 
of these stations. Archer, Wyo., has the lowest precipitation, 13.80 
inches. At all stations more than half the precipitation occurs during 
the late spring and summer months, or during the growing season, 
when it is most needed by the oat plant. 
