Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to April 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
204
260
164
190
521
91
65
252
492
597
Lone Rock183
231
158
460
60
41
187
418
530
​​Beloit
178
232
163
164
461
78
57
208
428
536
Sullivan
152
187
133
402
51
35
166
365
472
Madison
156
194
152
138
416
55
38
177
384
488
Juneau
144
184
124
386
44
31
150
344
451
Racine148
195
131
395
56
35
176
367
469
Waukesha139
180
122
375
48
33
156
342
442
Milwaukee141
193
118
122
373
46
29
155
341
444
Hartford
127
160
120
110
356
39
27
138
320
422
Appleton84
154
106
72
291
18
9
93
259
348
Green Bay90
152
102
76
295
20
10
99
262
353
Big Flats​133
183​
106
352
27
17
113
301
411
Ha​ncock​110
158
124
88
313
20
12
93
265
368
P​t Edwards110
162

87
311
22
14
89
263
367
La Crosse173
195
170
153
445
65
47
187
408
517
Eau Claire124
165
132
105
345
37
25
125
309
410
Cumberland
82
110
87
66
256
19
11
69
219
312
Bayfield56
66
45
183
13
7
45
146
223
Wausau68
110
105
52
217
11
5
50
177
265
Medford64
114
85
51
217
15
9
50
178
266
Crivitz78
132

57
245
5
2
45
194
294
Crandon49
80
37
171
5
0
34
135
210
​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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