Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to May 7, 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
342
405
269
338
774
205
151
463
760
871
Lone Rock302
365
282
687
145
104
369
656
776
​​Beloit
295
383
264
286
687
161
117
389
665
782
Sullivan
256
317
239
609
114
81
325
581
699
Madison
266
322
256
254
632
135
98
350
613
726
Juneau
244
305
224
585
106
78
300
553
669
Racine225
305
209
568
102
69
304
551
664
Waukesha222
295
205
555
94
64
288
532
644
Milwaukee209
299
191
191
537
86
58
272
515
628
Hartford
216
270
206
197
540
88
63
273
514
628
Appleton158
254
194
147
460
60
38
213
436
540
Green Bay158
248
186
146
457
57
36
213
433
539
Big Flats​233
290
206
550
88
62
263
508
628
Ha​ncock​204
258
220
179
501
74
51
229
460
574
P​t Edwards209
253
185
507
80
56
236
467
583
La Crosse294
302
289
281
678
157
117
375
653
773
Eau Claire238
255
237
222
562
115
83
293
535
646
Cumberland
182
177
170
164
449
80
57
210
419
524
Bayfield139
120
118
339
50
35
134
297
396
Wausau151
180
194
129
384
51
34
165
351
452
Medford149
176
166
129
386
55
37
166
354
456
Crivitz149
214
117
388
25
13
126
337
457
Crandon121
144
97
312
27
13
112
273
368
​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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