Growing Degree Days

Location	Mod 50°F Mod base 50F	2025 GDDs Mod base 50	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	212	122	100	194	463	99	74	254	444	530
Lone Rock	165	108	87	136	379	52	36	158	342	440
Beloit	202	117	100	173	433	72	49	213	405	496
Sullivan	161	69	86	132	367	45	31	152	334	423
Madison	153	99	91	131	365	53	37	161	338	425
Juneau	126	75	73	103	321	35	23	114	285	374
Racine	182	61	55	154	388	55	37	185	359	446
Waukesha	155	69		129	356	43	29	144	323	410
Milwaukee	157	60	71	132	362	46	31	155	329	420
Hartford	130	69	71	107	326	34	23	119	293	379
Appleton	81	61	58	65	229	17	9	76	203	277
Green Bay	74	43	55	57	213	11	7	62	186	259
Big Flats	113	90		91	285	33	22	92	245	332
Hancock	101	90	71	83	264	29	19	85	227	310
Pt Edwards	93	81		76	253	25	15	81	214	298
La Crosse	139	115	100	123	346	58	40	152	321	403
Eau Claire	104	86	72	87	270	35	23	100	240	321
Cumberland	57	67	44	49	180	16	9	60	154	217
Bayfield	20	47		16	102	4	2	15	77	127
Wausau	54	54	56	43	177	7	3	47	145	213
Medford	53	48	43	43	176	6	3	49	145	212
Crivitz	51	35		38	171	7	3	28	134	210
Crandon	31	35		23	132	0	0	19	101	161
Key to GDD calculation methods: Modified B50°F; 2025 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.