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Ottawa, IL
Full City Profile · Illinois · LaSalle County County
3.1
/5.0
B
Good
18,714
Population
1,256/sq mi density
$73,011
Median Income
$37,776 per capita
$144,500
Home Value
$205,721 Zillow
$922
Median Rent
27.0% income on rent
50°F
Avg Temperature
275 sunny days/yr
150
Violent Crime/100K
1,513 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$73,011 median income, 4.0% unemployment
A+
Affordability
5.0 / 5.0
$144,500 home value, $922/mo rent
F
Safety
1.0 / 5.0
150 violent crimes/100K
C+
Education
2.8 / 5.0
21.9% bachelor's degree or higher
Ottawa experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 23°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.0 inches. The area receives 25.0 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
23°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 49.7°F |
| 8% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 482 ft (147 m) |
| Area | 12.8 sq mi (33.2 km²) |
| Population Density | 1,256/sq mi |
| Coordinates | 41.3540°N, 88.8234°W |
| Timezone | America/Chicago |
| County | LaSalle County County |
| Nearest Airport | Illinois Valley Regional-Walter A Duncan Field (VYS) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 86.1 / 100 |
| Social Vulnerability | 38.9 / 100 |
| Community Resilience | 90.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.5 in | Coldest |
| February | 26°F (-3°C) | 1.3 in | Driest |
| March | 38°F (3°C) | 2.6 in | |
| April | 49°F (10°C) | 3.7 in | |
| May | 61°F (16°C) | 3.9 in | |
| June | 70°F (21°C) | 4.1 in | Wettest |
| July | 73°F (23°C) | 3.8 in | Warmest |
| August | 72°F (22°C) | 3.7 in | |
| September | 64°F (18°C) | 3.7 in | |
| October | 53°F (11°C) | 2.6 in | |
| November | 39°F (4°C) | 2.9 in | |
| December | 27°F (-3°C) | 2.2 in |
Ottawa has a seasonal temperature swing of 50°F / from 23°F in January to 73°F in July. Total annual precipitation is 36.0 inches, with June being the wettest month (4.1") and February the driest (1.3").