1000
Dec 1
J ec 15
800
Jan 1
Fan 15
Feb 1
600
eb 15
400
200
0
2
5
10 20
100
a. At Yankton.
Return Interval (years)
700
Dec 1
600
Dec 15
Jan 1
500
Jan 15
Feb 1
400
Feb 15
300
200
100
0
100
2
5 10 20
100
b. At Nebraska City.
Return Interval in Years
500
Dec 1
Dec 15
400
Jan 1
Jan 15
300
Feb 1
Feb 15
200
100
0
100
200
2
5 10 20
100
Return Interval in Years
c. At Booneville.
Figure 25. Probable cumulative freezing-degree-days.
24
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