St. Clair County, Illinois
| St. Clair County, Illinois | ||
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St. Clair County Courthouse, Belleville
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 Location in the U.S. state of Illinois |
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 Illinois's location in the U.S. |
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| Founded | 1790 | |
| Named for | Arthur St. Clair | |
| Seat | Belleville | |
| Largest city | Belleville | |
| Area | ||
| • Total | 674 sq mi (1,746 km2) | |
| • Land | 658 sq mi (1,704 km2) | |
| • Water | 16 sq mi (41 km2), 2.4% | |
| Population | ||
| • (2010) | 270,056 | |
| • Density | 411/sq mi (159/km²) | |
| Congressional district | 12th | |
| Time zone | Central: UTC-6/-5 | |
| Website | www |
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| Belleville, Illinois | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Climate chart () | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| J | F | M | A | M | J | J | A | S | O | N | D |
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2
40
22
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2.2
46
27
|
3.5
57
35
|
3.9
68
45
|
4.2
77
54
|
4
86
63
|
3.5
90
67
|
3.3
88
64
|
3
82
56
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2.9
71
45
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3.9
56
36
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3
44
27
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| Average max. and min. temperatures in °F | |||||||||||
| Precipitation totals in inches | |||||||||||
| Source: The Weather Channel | |||||||||||
| Metric conversion | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
|
51
4
−6
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56
8
−3
|
90
14
2
|
99
20
7
|
106
25
12
|
101
30
17
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89
32
19
|
85
31
18
|
76
28
13
|
73
22
7
|
99
13
2
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...
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