TO Nebraska Agricultural Exp. Station Research Bul. 16 
The freezing* temperatures prevailing up to the time of the last 
selection — January 17, 1918 — are indicated in Table 60. 
Table 30 — Duration , mean temperature , and minimum tempera- 
ture of freezing periods during autumn and early winter 
(1917-1918) 
Date 
Hours 
in period 
Mean 
temperature 
(degrees F.) 
Minimum 
temperature 
(degrees F.) 
Oct. 8 
9 
27.7 
24 
Oct. 10 
1 
32.0 
32 
Oct. 11-12 
11 
26.8 
23 
Oct. 12-13 
8 
27.9 
25 
Oct. 18-19 
13 
23.8 
18 
Oct. 20-21 
5 
31.2 
31 
Oct. 22-23 
13 
28.8 
23 
Oct. 24 
2 
32.0 
32 
Oct. 26 
5 
31.0 
30 
Oct. 27 
6 
31.0 
30 
Oct. 28-30 
45 
25.2 
17 
Oct. 30-31 
12 
26.7 
24 
Oct. 31-Nov. 1 
12 
27.8 
26 
Nov. 1-2 
10 
30.2 
29 
Nov. 4 
5 
30.2 
29 
Nov. 18-19 
14 
26.1 
21 
Nov. 23 
10 
28.1 
24 
Nov. 23-24 
15 
25.4 
19 
Nov. 24-25. ,° 
17 
30.2 
28 
Nov. 26 
2 
32.0 
32 
Nov. 26-27 
5 
30.6 
30 
Nov. 27-28 
14 
23.4 
18 
Nov. 29 
3 
32.0 
32 
Nov. 30 
9 
28.7 
26 
Nov. 30-Dec. 1 
10 
28.1 
26 
Dec. 1-2 
10 
28.6 
27 
Dec. 3 
12 
25.9 
22 
Dec. 3-4 
14 
20.1 
22 
Dec. 4-16 
290 
5.6 
-16 
Dec. 17 
3 
31.7 
31 
Dec. 18 
5 
30.6 
30 
Dec. 20-21 
14 
26.4 
25 
Dec. 21-22 
14 
27.0 
20 
Dec. 24-26 
61 
17.6 
12 
Dec. 26-Jan. 1 
136 
11.3 
—18 
Jan. 2-3 
33 
20.7 
15 
Jan. 3-4 
16 
29.1 
25 
Jan. 5-17 
290 
7.0 
—23 
At 9 o'clock A. M., on October 8, following the heavy frost 
earlier in the morning, a thermometer inserted into the center of 
the cob of corn ears hanging naturally in the field recorded a 
