Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to January 25, 2026​​​​​​​​​

​Location​​
​Mod 50°F
Corn development, 
Codling moth, 
European corn borer​​
​2025 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
​3
0
1
3
22
0
0
5
20
29
Lone Rock1
0
1
17
0
0
0
13
23
​​Beloit
8
1
2
6
25
0
0
5
21
31
Sullivan7
0
5
23
0
0
2
19
28
Madison6
0
0
4
24
0
0
3
20
29
Juneau
4
0
3
21
0
0
0
16
25
Racine8
0
6
26
0
0
5
23
34
Waukesha5
0
4
22
0
0
1
17
27
Milwaukee7
1
0
5
25
0
0
4
21
32
Hartford
4
0
0
3
20
0
0
0
16
25
Appleton0
0
0
0
6
0
0
0
5
10
Green Bay0
0
0
0
4
0
0
0
3
7
Big Flats​0
0
0
6
0
0
0
4
10
Ha​ncock​0
0
0
0
5
0
0
0
3
8
P​t Edwards0
0
0
4
0
0
0
2
6
La Crosse0
0
1
0
10
0
0
0
8
14
Eau Claire0
0
0
0
2
0
0
0
1
4
Cumberland
0
0
0
0
0
0
0
0
0
1
Bayfield0
0
0
0
0
0
0
0
0
Wausau0
0
0
0
0
0
0
0
0
1
Medford0
0
0
0
0
0
0
0
0
0
​Crivitz
0
0
0
3
0
0
0
2
5
Crandon0
0
0
0
0
0
0
0
0​
​Key​ to GDD calculation methods: Modified B50°F; 2025 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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