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Walnut Hill, IL
Full City Profile · Illinois · Washington County County
1.4
/5.0
F
Poor
135
Population
355/sq mi density
$33,000
Home Value
$194,762 Zillow
55°F
Avg Temperature
293 sunny days/yr
778
Violent Crime/100K
4,848 property/100K
F
Overall
1.4 / 5.0
Below average overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
778 violent crimes/100K (105% above avg)
D
Education
1.9 / 5.0
10.9% bachelor's degree or higher
Walnut Hill experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 30°F in January while summers reach 77°F in July. The area gets 293 sunny days per year. Annual precipitation totals 42.2 inches. The area receives 11.7 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
30°F Jan (-1°C)
77°F Jul (25°C)
| Annual Average | 55.1°F |
| 2% above US avg | |
| January Average | 30°F (-1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 571 ft (174 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 355/sq mi |
| Coordinates | 38.4779°N, 89.0444°W |
| Timezone | America/Chicago |
| County | Washington County County |
| Nearest Airport | St Louis Regional (ALN) 61 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 55.2 / 100 |
| Social Vulnerability | 42.1 / 100 |
| Community Resilience | 98.5 / 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 Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Very 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 | 30°F (-1°C) | 2.2 in | Coldest, Driest |
| February | 34°F (1°C) | 2.6 in | |
| March | 44°F (7°C) | 4.1 in | |
| April | 55°F (13°C) | 4.0 in | |
| May | 64°F (18°C) | 4.4 in | Wettest |
| June | 73°F (23°C) | 3.8 in | |
| July | 77°F (25°C) | 3.8 in | Warmest |
| August | 76°F (24°C) | 3.0 in | |
| September | 69°F (20°C) | 3.2 in | |
| October | 57°F (14°C) | 3.1 in | |
| November | 45°F (7°C) | 3.9 in | |
| December | 34°F (1°C) | 3.4 in |
Walnut Hill has a seasonal temperature swing of 47°F / from 30°F in January to 77°F in July. Total annual precipitation is 41.5 inches, with May being the wettest month (4.4") and January the driest (2.2").