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Johnston City, IL
Full City Profile · Illinois · Williamson County County
3.1
/5.0
B
Good
3,351
Population
1,581/sq mi density
$46,629
Median Income
$33,916 per capita
$84,500
Home Value
$103,742 Zillow
$830
Median Rent
39.5% income on rent
57°F
Avg Temperature
305 sunny days/yr
74
Violent Crime/100K
1,915 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.5 / 5.0
$46,629 median income, 2.1% unemployment
A+
Affordability
5.0 / 5.0
$84,500 home value, $830/mo rent
F
Safety
1.0 / 5.0
74 violent crimes/100K
C+
Education
2.8 / 5.0
21.9% bachelor's degree or higher
Johnston City enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 33°F in January while summers reach 79°F in July. The area gets 305 sunny days per year. Annual precipitation totals 47.6 inches. Air quality is rated Good with a median AQI of 43.
Temperature
33°F Jan (1°C)
79°F Jul (26°C)
| Annual Average | 57.3°F |
| 6% above US avg | |
| January Average | 33°F (1°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 305 days/yr |
Geography
| Elevation | 440 ft (134 m) |
| Area | 0.8 sq mi (2.1 km²) |
| Population Density | 1,581/sq mi |
| Coordinates | 37.8210°N, 88.9293°W |
| Timezone | America/Chicago |
| County | Williamson County County |
| Nearest Airport | Barkley Regional (PAH) 53 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 85.8 / 100 |
| Social Vulnerability | 55.4 / 100 |
| Community Resilience | 78.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 2.9 in | Coldest, Driest |
| February | 36°F (2°C) | 3.1 in | |
| March | 46°F (8°C) | 4.7 in | Wettest |
| April | 56°F (13°C) | 4.3 in | |
| May | 66°F (19°C) | 4.7 in | |
| June | 74°F (23°C) | 4.0 in | |
| July | 79°F (26°C) | 3.7 in | Warmest |
| August | 76°F (25°C) | 3.5 in | |
| September | 70°F (21°C) | 3.1 in | |
| October | 58°F (14°C) | 3.0 in | |
| November | 47°F (8°C) | 4.2 in | |
| December | 36°F (2°C) | 3.9 in |
Johnston City has a seasonal temperature swing of 45°F / from 33°F in January to 79°F in July. Total annual precipitation is 45.2 inches, with March being the wettest month (4.7") and January the driest (2.9").