Johnson County, Illinois
| Johnson County, Illinois | |
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Johnson County Courthouse in Vienna
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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 | 1812 |
| Named for | Richard Mentor Johnson |
| Seat | Vienna |
| Largest city | Vienna |
| Area | |
| • Total | 349 sq mi (904 km2) |
| • Land | 344 sq mi (891 km2) |
| • Water | 4.9 sq mi (13 km2), 1.4% |
| Population | |
| • (2010) | 12,582 |
| • Density | 37/sq mi (14/km²) |
| Congressional district | 15th |
| Time zone | Central: UTC-6/-5 |
| Vienna, 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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3.4
43
25
|
3.4
50
29
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4.6
60
38
|
4.7
71
46
|
5.2
79
55
|
4.1
87
63
|
3.8
90
67
|
3.6
90
65
|
3.3
84
58
|
3.2
73
47
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4.7
59
39
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4.4
47
29
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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 |
|
86
6
−4
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86
10
−2
|
117
16
3
|
120
22
8
|
131
26
13
|
104
31
17
|
95
32
19
|
91
32
18
|
83
29
14
|
80
23
8
|
120
15
4
|
112
8
Wikipedia
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