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Monticello, IL
Full City Profile · Illinois · Piatt County County
3.7
/5.0
B+
Good
6,332
Population
1,571/sq mi density
$88,611
Median Income
$42,725 per capita
$196,000
Home Value
$266,645 Zillow
$1,030
Median Rent
33.6% income on rent
51°F
Avg Temperature
275 sunny days/yr
215
Violent Crime/100K
484 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$88,611 median income, 1.4% unemployment
A+
Affordability
5.0 / 5.0
$196,000 home value, $1,030/mo rent
F
Safety
1.0 / 5.0
215 violent crimes/100K
A
Education
4.1 / 5.0
38.4% bachelor's degree or higher
Monticello experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.6 inches. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 51.1°F |
| 5% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 667 ft (203 m) |
| Area | 3.9 sq mi (10.0 km²) |
| Population Density | 1,571/sq mi |
| Coordinates | 40.0335°N, 88.5741°W |
| Timezone | America/Chicago |
| County | Piatt County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 36 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 35.0 / 100 |
| Social Vulnerability | 24.6 / 100 |
| Community Resilience | 88.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively 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 | 25°F (-4°C) | 1.8 in | Coldest, Driest |
| February | 29°F (-2°C) | 1.8 in | |
| March | 40°F (5°C) | 3.2 in | |
| April | 52°F (11°C) | 4.0 in | |
| May | 63°F (17°C) | 4.1 in | |
| June | 72°F (22°C) | 3.8 in | |
| July | 73°F (23°C) | 4.4 in | Warmest, Wettest |
| August | 73°F (23°C) | 3.9 in | |
| September | 66°F (19°C) | 3.3 in | |
| October | 55°F (13°C) | 2.7 in | |
| November | 42°F (5°C) | 3.1 in | |
| December | 30°F (-1°C) | 2.9 in |
Monticello has a seasonal temperature swing of 48°F / from 25°F in January to 73°F in July. Total annual precipitation is 38.9 inches, with July being the wettest month (4.4") and January the driest (1.8").