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Karnak, IL
Full City Profile · Illinois · Johnson County County
2.9
/5.0
C+
Fair
507
Population
280/sq mi density
$41,458
Median Income
$20,993 per capita
$66,700
Home Value
$74,104 Zillow
$708
Median Rent
26.3% income on rent
58°F
Avg Temperature
299 sunny days/yr
138
Violent Crime/100K
551 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.3 / 5.0
$41,458 median income, 1.6% unemployment
A+
Affordability
5.0 / 5.0
$66,700 home value, $708/mo rent
F
Safety
1.0 / 5.0
138 violent crimes/100K
C
Education
2.4 / 5.0
17.1% bachelor's degree or higher
Karnak enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 35°F in January while summers reach 79°F in July. The area gets 299 sunny days per year. Annual precipitation totals 50.8 inches. Air quality is rated Good with a median AQI of 43.
Temperature
35°F Jan (2°C)
79°F Jul (26°C)
| Annual Average | 58.2°F |
| 8% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 299 days/yr |
Geography
| Elevation | 342 ft (104 m) |
| Area | 1.8 sq mi (4.7 km²) |
| Population Density | 280/sq mi |
| Coordinates | 37.2942°N, 88.9761°W |
| Timezone | America/Chicago |
| County | Johnson County County |
| Nearest Airport | Barkley Regional (PAH) 20 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 | 35°F (2°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 | 75°F (24°C) | 4.0 in | |
| July | 79°F (26°C) | 3.9 in | Warmest |
| August | 77°F (25°C) | 3.5 in | |
| September | 70°F (21°C) | 3.5 in | |
| October | 59°F (15°C) | 3.1 in | Driest |
| November | 48°F (9°C) | 4.3 in | |
| December | 38°F (3°C) | 4.4 in |
Karnak has a seasonal temperature swing of 44°F / from 35°F in January to 79°F in July. Total annual precipitation is 47.8 inches, with May being the wettest month (4.9") and October the driest (3.1").