Seymour, IL
Full City Profile · Illinois · Piatt County County
1.9
/5.0
D
Poor
333
Population
3,700/sq mi density
$135,500
Home Value
$311,291 Zillow
51°F
Avg Temperature
D
Overall
1.9 / 5.0
Below average overall score based on economy, affordability, safety and education
D
Education
1.9 / 5.0
11.7% bachelor's degree or higher
Seymour experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 73°F in July. Annual precipitation totals 39.6 inches. The area receives 18.1 inches of snow annually.
Temperature
25°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 51.1°F |
| 5% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 700 ft (213 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 3,700/sq mi |
| Coordinates | 40.1068°N, 88.4271°W |
| Timezone | America/Chicago |
| County | Piatt County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 36 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 35.0 / 100 |
| Social Vulnerability | 24.6 / 100 |
| Community Resilience | 88.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| 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 | 25°F (-4°C) | 2.3 in | Coldest |
| February | 30°F (-1°C) | 2.0 in | Driest |
| March | 40°F (5°C) | 2.9 in | |
| April | 52°F (11°C) | 3.7 in | |
| May | 62°F (17°C) | 4.6 in | |
| June | 71°F (22°C) | 4.9 in | Wettest |
| July | 73°F (23°C) | 4.3 in | Warmest |
| August | 71°F (22°C) | 3.3 in | |
| September | 65°F (18°C) | 3.1 in | |
| October | 53°F (12°C) | 3.2 in | |
| November | 41°F (5°C) | 3.1 in | |
| December | 31°F (-1°C) | 2.3 in |
Seymour has a seasonal temperature swing of 48°F / from 25°F in January to 73°F in July. Total annual precipitation is 39.6 inches, with June being the wettest month (4.9") and February the driest (2.0").