Decatur, IL Weather

Average Temperature
Jan
32 °F
0 °C
Feb
35 °F
2 °C
Mar
45 °F
7 °C
Apr
57 °F
14 °C
May
72 °F
22 °C
Jun
77 °F
25 °C
Jul
84 °F
29 °C
Aug
81 °F
27 °C
Sep
80 °F
27 °C
Oct
63 °F
17 °C
Nov
41 °F
5 °C
Dec
41 °F
5 °C
Humidity
Jan
77%
Feb
76%
Mar
68%
Apr
71%
May
78%
Jun
81%
Jul
82%
Aug
82%
Sep
80%
Oct
71%
Nov
76%
Dec
78%
Rain
Jan
75mm
Feb
58mm
Mar
94mm
Apr
88mm
May
172mm
Jun
173mm
Jul
47mm
Aug
184mm
Sep
91mm
Oct
87mm
Nov
41mm
Dec
53mm
Clouds
Jan
66%
Feb
70%
Mar
54%
Apr
60%
May
57%
Jun
47%
Jul
26%
Aug
31%
Sep
33%
Oct
31%
Nov
56%
Dec
56%
Air quality US AQI
Jan
38
Feb
37
Mar
35
Apr
36
May
38
Jun
34
Jul
38
Aug
39
Sep
36
Oct
32
Nov
42
Dec
45
Sun
Jan
2UVI
Feb
3UVI
Mar
4UVI
Apr
5UVI
May
7UVI
Jun
8UVI
Jul
9UVI
Aug
7UVI
Sep
7UVI
Oct
4UVI
Nov
2UVI
Dec
2UVI