| LaSalle County, Illinois | |
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LaSalle County Courthouse
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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 | January 15, 1831 |
| Named for | René-Robert Cavelier, Sieur de La Salle |
| Seat | Ottawa |
| Largest city | Ottawa |
| Area | |
| • Total | 1,148 sq mi (2,973 km2) |
| • Land | 1,135 sq mi (2,940 km2) |
| • Water | 13 sq mi (34 km2), 1.1% |
| Population (est.) | |
| • (2015) | 111,333 |
| • Density | 98/sq mi (38/km²) |
| Congressional district | 16th |
| Time zone | Central: UTC-6/-5 |
| Website | www |
| Footnotes: | |
| Ottawa, 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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1.5
30
12
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1.3
37
18
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2.6
49
29
|
3.4
62
39
|
4
73
50
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4.1
82
59
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3.6
85
63
|
3.8
83
61
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3.5
77
53
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2.6
65
41
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3
49
30
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2.3
36
18
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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 |
|
37
−1
−11
|
34
3
−8
|
66
9
−2
|
87
17
4
|
102
23
10
|
105
28
15
|
92
29
17
|
96
28
16
|
89
25
12
|
66
18
5
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75
9
−1
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58
...
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