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Janesville, IL
Full City Profile · Illinois · Cumberland County County
3.0
/5.0
B
Good
14
Population
233/sq mi density
53°F
Avg Temperature
302 sunny days/yr
132
Violent Crime/100K
482 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
132 violent crimes/100K
A+
Education
5.0 / 5.0
0.0% bachelor's degree or higher
Janesville experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 28°F in January while summers reach 76°F in July. The area gets 302 sunny days per year. Annual precipitation totals 36.0 inches. Air quality is rated Good with a median AQI of 43.
Temperature
28°F Jan (-2°C)
76°F Jul (24°C)
| Annual Average | 53.4°F |
| 1% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 690 ft (210 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 233/sq mi |
| Coordinates | 39.3752°N, 88.2450°W |
| Timezone | America/Chicago |
| County | Cumberland County County |
| Nearest Airport | Terre Haute Regional (HUF) 50 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 25.9 / 100 |
| Social Vulnerability | 63.2 / 100 |
| Community Resilience | 88.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.1 in | Coldest, Driest |
| February | 31°F (-1°C) | 2.2 in | |
| March | 42°F (5°C) | 3.4 in | |
| April | 53°F (11°C) | 4.0 in | |
| May | 63°F (17°C) | 4.1 in | |
| June | 72°F (22°C) | 4.0 in | |
| July | 76°F (24°C) | 4.4 in | Warmest, Wettest |
| August | 74°F (23°C) | 3.5 in | |
| September | 67°F (20°C) | 3.2 in | |
| October | 56°F (13°C) | 3.1 in | |
| November | 43°F (6°C) | 3.7 in | |
| December | 32°F (-0°C) | 3.2 in |
Janesville has a seasonal temperature swing of 48°F / from 28°F in January to 76°F in July. Total annual precipitation is 41.0 inches, with July being the wettest month (4.4") and January the driest (2.1").