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Twin Grove, IL
Full City Profile · Illinois · Tazewell County County
4.3
/5.0
A
Great
1,554
Population
392/sq mi density
$113,250
Median Income
$72,497 per capita
$246,400
Home Value
$233,732 Zillow
$1,111
Median Rent
51.0% income on rent
50°F
Avg Temperature
275 sunny days/yr
A
Overall
4.3 / 5.0
Strong
A+
Economy
4.8 / 5.0
$113,250 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$246,400 home value, $1,111/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
A+
Education
5.0 / 5.0
56.0% bachelor's degree or higher
Twin Grove experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 23°F in January while summers reach 74°F in July. The area gets 275 sunny days per year. Annual precipitation totals 40.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
23°F Jan (-5°C)
74°F Jul (23°C)
| Annual Average | 50.2°F |
| 7% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 751 ft (229 m) |
| Area | 4.0 sq mi (10.3 km²) |
| Population Density | 392/sq mi |
| Coordinates | 40.4793°N, 89.1015°W |
| Timezone | America/Chicago |
| County | Tazewell County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 84.2 / 100 |
| Social Vulnerability | 23.2 / 100 |
| Community Resilience | 94.5 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.7 in | Coldest |
| February | 28°F (-2°C) | 1.6 in | Driest |
| March | 40°F (4°C) | 3.1 in | |
| April | 51°F (11°C) | 3.8 in | |
| May | 62°F (17°C) | 4.3 in | Wettest |
| June | 71°F (22°C) | 3.9 in | |
| July | 74°F (23°C) | 4.0 in | Warmest |
| August | 73°F (23°C) | 3.6 in | |
| September | 66°F (19°C) | 3.7 in | |
| October | 54°F (12°C) | 2.8 in | |
| November | 41°F (5°C) | 2.8 in | |
| December | 29°F (-2°C) | 2.8 in |
Twin Grove has a seasonal temperature swing of 51°F / from 23°F in January to 74°F in July. Total annual precipitation is 37.9 inches, with May being the wettest month (4.3") and February the driest (1.6").