Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to January 11, 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
0
3
14
0
0
5
13
19
Lone Rock0
0
1
0
8
0
0
0
6
11
​​Beloit
7
0
​
5
17
0
0
5
15
20
Sullivan
6
0
4
16
0
0
2
13
18
Madison
5
0
0
3
15
0
0
3
12
17
Juneau
4
0
2
14
0
0
0
11
16
Racine6
0
5
17
0
0
5
16
22
Waukesha4
0

3
14
0
0
1
12
17
Milwaukee5
0
0
3
15
0
0
3
13
19
Hartford
4
0
0
3
14
0
0
0
12
16
Appleton0
0
0
0
2
0
0
0
1
4
Green Bay0
0
0
0
1
0
0
0
1
3
Big Flats​0
0
0
1
0
0
0
1
2
Ha​ncock​0
0
0
0
0
0
0
0
0
1
P​t Edwards0
0
0
0
0
0
0
0
1
La Crosse0
0
1
0
2
0
0
0
1
4​
Eau Claire0
0
0
0
0
0
0
0
0
0
Cumberland
0
0
0
0
0
0
0
0
0
0
Bayfield0
0
0
0
0
0
0
0
0
Wausau0
0
0
0
0
0
0
0
0
0
Medford0
0
0
0
0
0
0
0
0
0
​Crivitz
0
0
0
0
0
0
0
0
0
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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