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Simpson, IL
Full City Profile · Illinois · Johnson County County
2.2
/5.0
C
Fair
56
Population
106/sq mi density
$80,000
Home Value
$189,899 Zillow
57°F
Avg Temperature
299 sunny days/yr
138
Violent Crime/100K
551 property/100K
C
Overall
2.2 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
138 violent crimes/100K
B
Education
3.3 / 5.0
29.3% bachelor's degree or higher
Simpson enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 34°F in January while summers reach 77°F in July. The area gets 299 sunny days per year. Annual precipitation totals 50.5 inches. The area receives 7.2 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
34°F Jan (1°C)
77°F Jul (25°C)
| Annual Average | 57.2°F |
| 6% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 299 days/yr |
Geography
| Elevation | 391 ft (119 m) |
| Area | 0.5 sq mi (1.4 km²) |
| Population Density | 106/sq mi |
| Coordinates | 37.4674°N, 88.7579°W |
| Timezone | America/Chicago |
| County | Johnson County County |
| Nearest Airport | Barkley Regional (PAH) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 51.1 / 100 |
| Social Vulnerability | 82.0 / 100 |
| Community Resilience | 47.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 3.2 in | Coldest |
| February | 37°F (3°C) | 3.5 in | |
| March | 47°F (8°C) | 4.8 in | |
| April | 57°F (14°C) | 4.7 in | |
| May | 66°F (19°C) | 4.9 in | Wettest |
| June | 74°F (23°C) | 4.1 in | |
| July | 77°F (25°C) | 4.0 in | Warmest |
| August | 76°F (25°C) | 3.5 in | |
| September | 70°F (21°C) | 3.4 in | |
| October | 58°F (15°C) | 3.1 in | Driest |
| November | 47°F (8°C) | 4.2 in | |
| December | 37°F (3°C) | 4.3 in |
Simpson has a seasonal temperature swing of 43°F / from 34°F in January to 77°F in July. Total annual precipitation is 47.6 inches, with May being the wettest month (4.9") and October the driest (3.1").