Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to June 4, 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
703
822
633
739
1398
548
442
1002
1409
1512
Lone Rock622
745
621
1235
418
326
831
1229
1351
​​Beloit
618
795
618
634
1246
444
349
861
1248
1364
Sullivan
556
683
554
1127
362
280
756
1125
1249
Madison
576
692
611
587
1173
404
318
805
1180
1298
Juneau
539
658
533
1094
344
269
720
1085
1211
Racine464
652
467
1026
295
225
674
1034
1160
Waukesha488
645
487
1034
309
238
680
1036
1161
Milwaukee456
651
489
456
996
285
218
643
999
1126
Hartford
494
604
519
489
1029
309
242
674
1027
1152
Appleton444
601
511
450
965
295
228
630
966
1082
Green Bay449
586
500
455
969
297
232
639
971
1086
Big Flats​534
644
521
1068
326
255
686
1046
1172
Ha​ncock​496
594
557
484
1008
303
237
640
985
1108
P​t Edwards504
589
495
1020
314
245
655
1001
1123
La Crosse621
694
682
636
1244
450
358
857
1246
1366
Eau Claire561
630
584
569
1115
396
319
761
1114
1220
Cumberland
465
503
475
464
951
309
246
617
940
1048
Bayfield409
382
386
797
243
197
472
756
871
Wausau420
484
510
406
859
250
194
533
837
960
Medford410
475
455
395
852
246
190
524
831
952
​Crivitz
431
519
400
871
224
171
501
831
968
Crandon372
414
348
758
200
149
443
724
846
​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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