Jefferson County, Illinois
| Jefferson County, Illinois | |
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Jefferson County Courthouse in Mount Vernon
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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 | 1819 |
| Named for | Thomas Jefferson |
| Seat | Mount Vernon |
| Largest city | Mount Vernon |
| Area | |
| • Total | 584 sq mi (1,513 km2) |
| • Land | 571 sq mi (1,479 km2) |
| • Water | 13 sq mi (34 km2), 2.2% |
| Population | |
| • (2010) | 38,827 |
| • Density | 68/sq mi (26/km²) |
| Congressional district | 12th |
| Time zone | Central: UTC-6/-5 |
| Website | www |
| Mount Vernon, 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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2.5
37
19
|
2.7
43
23
|
4
54
33
|
4.4
65
43
|
4.6
75
53
|
3.6
84
62
|
3.6
88
66
|
3.3
86
64
|
3.1
79
56
|
2.9
68
43
|
4.4
54
34
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3.2
42
24
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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 |
|
62
3
−7
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68
6
−5
|
101
12
1
|
113
18
6
|
116
24
12
|
92
29
17
|
91
31
19
|
83
30
18
|
79
26
13
|
74
20
6
|
111
12
1
|
81
Wikipedia
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