Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to March 23, 2025​​​​​​​​​

​Location​​
​Mod 50°F
Corn development, 
Codling moth, 
European corn borer​​
​2024 GDDs
Mod base 50F
​30-yr avg.

1991-2020


​Sine B48
Alfalfa weevil
​Mod B40
Onion maggot
​Simple B50
Flea beetles, Imported cabbageworm,​ Squash vine borer
​Simple B52
Colorado potato beetle, Corn rootworm adults
​​Simple B43
Cabbage maggot
​Sine B39
Seedcorn maggot
​​Mod B38
​Western bean cutworm
Dubuque IA
82
116
34
68
222
21
15
71
193
257
Lone Rock69
106
54
191
12
10
47
159
224
​​Beloit
62
105
36
50
181
14
11
48
153
215
Sullivan
56
81
44
162
11
8
44
136
193
Madison
58
83
32
45
166
12
8
44
142
200
Juneau
57
77

45
159
12
9
43
131
187
Racine54
85
43
167
10
4
46
142
204
Waukesha51
76
40
149
10
6
40
126
180
Milwaukee57
83
26
44
159
8
3
44
134
194
Hartford
49
64
25
38
145
9
7
38
121
174
Appleton36
57
19
28
123
4
1
27
100
149
Green Bay37
57
17
28
123
3
1
28
100
149
Big Flats​
60
87
46
157
10
8
41
129
184
Ha​ncock​52
71
23
40
140
8
6
36
114
164
P​t Edwards52
73
39
137
8
6
33
111
162
La Crosse67
91
33
55
187
17
13
56
161
221
Eau Claire48
72
22
38
140
12
9
35
117
167
Cumberland
28
36
12
21
95
7
5
17
75
119
Bayfield24
18
18
79
5
3
13
60
97
Wausau30
43
17
22
93
5
3
17
73
114
Medford29
47
12
22
90
7
5
17
71
111
Crivitz29
48
20
102
0
0
10
73
124
Crandon​19
30
14
71
2
0
10
54
90
​Key​ to GDD calculation methods: Modified B50°F; 2024 Modified B50°F; 30-Year Average 1991-2020; Sine B48°F; Modified​ B40°F; Simple B50​​°F; Simple B52°F; Simple B43°F, Sine B39°F; Modified B38°F.   ​ ​ ​ ​ ​ ​ ​ ​ ​ 

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