Richland County, Illinois
| Richland County, Illinois | |
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Richland County Courthouse in Olney
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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 | February 24, 1841 |
| Seat | Olney |
| Largest city | Olney |
| Area | |
| • Total | 362 sq mi (938 km2) |
| • Land | 3,560 sq mi (9,220 km2) |
| • Water | 1.9 sq mi (5 km2), 0.5% |
| Population | |
| • (2010) | 16,233 |
| • Density | 45/sq mi (17/km²) |
| Congressional district | 15th |
| Time zone | Central: UTC-6/-5 |
| Olney, 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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2.8
36
19
|
2.7
42
23
|
4.4
54
32
|
4.4
65
42
|
4.8
75
52
|
4.1
84
62
|
4.1
88
66
|
3.6
86
63
|
3.1
80
55
|
3.3
69
44
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4.4
54
34
|
3.7
41
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 |
|
72
2
−7
|
69
6
−5
|
110
12
0
|
111
18
6
|
121
24
11
|
103
29
17
|
105
31
19
|
90
30
17
|
78
27
13
|
85
21
7
|
112
12
1
|
93
5
−4
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