Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to August 20​, 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
2571
2529
2202
2782
4071
2452
2192
3445
4130
4009
Lone Rock2364
2314
2533
3774
2186
1941
3138
3822
3755
​​Beloit
2380
2419
2183
2574
3819
2246
1998
3203
3867
3779
Sullivan
2277
2254
2448
3651
2115
1880
3048
3699
3644
Madison
2317
2273
2168
2496
3706
2167
1927
3107
3771
3725
Juneau
2212
2181
2377
3565
2045
1816
2960
3611
3569
Racine2211
2276
2393
3593
2092
1868
3010
3637
3594
Waukesha2169
2177
2336
3508
2013
1788
2923
3568
3543
Milwaukee2164
2258
2069
2343
3522
2040
1819
2938
3563
3526
Hartford
2154
2104
1934
2319
3485
1995
1773
2899
3539
3509
Appleton2076
2121
2015
2248
3388
1948
1727
2822
3447
3428
Green Bay2094
2105
1943
2271
3416
1974
1756
2855
3469
3427
Big Flats​2135
2086
2286
3458
1946
1721
2845
3495
3479
Ha​ncock​2044
1980
2005
2197
3345
1870
1650
2746
3382
3376
P​t Edwards2080
1988
2238
3389
1913
1690
2794
3427
3406
La Crosse2376
2252
2367
2556
3788
2224
1978
3170
3849
3800
Eau Claire2198
2104
2087
2372
3542
2054
1822
2958
3600
3557
Cumberland
1879
1791
1887
2034
3138
1726
1509
2573
3198
3240
Bayfield1655
1443

1767
2792
1468
1269
2236
2822
2886
Wausau1825
1735
1925
1963
3034
1656
1448
2477
3083
3132
Medford1755
1686
1763
1908
2981
1605
1397
2423
3033
3094
​Crivitz
1879
1844
2008
3104
1688
1483
2503
3122
3121
Crandon1613
1534
1726
2749
1424
1223
2203
2790
2883
​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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