How mold-prone is your part of the country, ranked state by state from NOAA climate normals.
1 Florida High
86
2 Louisiana High
85
3 Hawaii High
85
4 Mississippi High
79
5 Alabama High
76
6 Georgia High
71
7 Tennessee Moderate
68
8 Arkansas Moderate
68
9 South Carolina Moderate
68
10 North Carolina Moderate
66
11 Texas Moderate
62
12 Kentucky Moderate
61
13 District of Columbia Moderate
60
14 Delaware Moderate
59
15 Maryland Moderate
58
16 New Jersey Moderate
57
17 Oklahoma Moderate
57
18 Virginia Moderate
57
19 Missouri Moderate
56
20 Rhode Island Moderate
55
21 West Virginia Moderate
55
22 Connecticut Moderate
53
23 Pennsylvania Moderate
52
24 Massachusetts Moderate
52
25 Indiana Moderate
51
26 New York Moderate
50
27 Oregon Moderate
50
28 Ohio Lower
49
29 Illinois Lower
48
30 Washington Lower
46
31 New Hampshire Lower
46
32 Kansas Lower
46
33 Maine Lower
45
34 California Lower
42
35 Vermont Lower
42
36 Iowa Lower
40
37 Michigan Lower
38
38 Arizona Lower
37
39 Wisconsin Lower
36
40 Nebraska Lower
34
41 Minnesota Lower
31
42 New Mexico Low
28
43 Alaska Low
28
44 South Dakota Low
27
45 Utah Low
26
46 Nevada Low
25
47 Idaho Low
24
48 Colorado Low
23
49 Montana Low
19
50 North Dakota Low
18
51 Wyoming Low
16
How to read this
The index blends average rainfall and temperature into a relative score for how favorable a state's climate is to mold growth. It is a climate signal, not a guarantee, because indoor moisture and ventilation still decide what happens in any single home.