Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to May 16, 2024​​​​​​​​​

​Location​​
​Mod 50°F
Corn development, 
Codling moth, 
European corn borer​​
​2023 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
524
408
360
539
1075
371
292
731
1072
1200
Lone Rock476
361

464
972
295
227
607
948
1088
Beloit
485
383
352
494
999
345
272
668
996
1117
Sullivan
411
338

411
877
272
205
560
867
990
Madison
419
341
345
425
893
282
214
586
890
1008
Juneau
399
314

394
847
253
187
534
834
958
Racine390
302

403
864
269
198
578
871
988
Waukesha380
314

384
837
252
181
544
837
953
Milwaukee
383
324
262
390
845
256
184
563
850
968
Hartford
355
304
281
357
794
228
163
504
790
907
Appleton
340
277
269
388
774
205
141
483
771
885
Green Bay328
275
260
320
750
181
119
457
743
860
Big Flats​
392
294

360
835
192
137
457
789
947
Ha​ncock​356
276
303
331
780
178
123
431
741
888
P​t Edwards349
275
318
777
157
107
417
735
885
La Crosse417
349
386
416
912
262
197
567
896
1032
Eau Claire361
313
322
342
799
187
136
465
774
909
Cumberland
265
227
241
240
629
107
69
335
602
729
Bayfield170
184
141
463
37
23
174
415
544
Wausau266
232
269
237
638
101
59
327
605
740
Medford
259
226
232
227
617
91
53
307
582
715
Crivitz294
252
252
664
98
61
320
614
764
Crandon218
211
182
541
58
31
227
489
629
​Key​ to GDD calculation methods: Modified B50°F; 2023 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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