All Countries
Mount Prospect, IL
Full City Profile · Illinois · Lake County County
3.9
/5.0
B+
Good
55,648
Population
5,191/sq mi density
$103,911
Median Income
$48,113 per capita
$377,000
Home Value
$420,998 Zillow
$1,454
Median Rent
29.1% income on rent
51°F
Avg Temperature
260 sunny days/yr
54
Violent Crime/100K
858 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$103,911 median income, 2.4% unemployment
A+
Affordability
4.6 / 5.0
$377,000 home value, $1,454/mo rent
F
Safety
1.0 / 5.0
54 violent crimes/100K
A+
Education
4.9 / 5.0
48.6% bachelor's degree or higher
Mount Prospect experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 75°F in July. The area gets 260 sunny days per year. Annual precipitation totals 32.3 inches. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 682 ft (208 m) |
| Area | 10.4 sq mi (26.9 km²) |
| Population Density | 5,191/sq mi |
| Coordinates | 42.0642°N, 87.9374°W |
| Timezone | America/Chicago |
| County | Lake County County |
| Nearest Airport | Chicago O'Hare International (ORD) 6 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0480 ppm |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.0 / 100 |
| Social Vulnerability | 14.1 / 100 |
| Community Resilience | 78.1 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1954 | MICHIGAN CITY, IN (LAKE MICHIGAN) | Avalanche | 3.0 m | 7 | 96 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.7 in | Coldest |
| February | 27°F (-3°C) | 1.4 in | Driest |
| March | 37°F (3°C) | 2.5 in | |
| April | 48°F (9°C) | 3.6 in | |
| May | 59°F (15°C) | 3.5 in | |
| June | 69°F (21°C) | 3.8 in | |
| July | 75°F (24°C) | 3.7 in | Warmest |
| August | 72°F (22°C) | 4.2 in | Wettest |
| September | 64°F (18°C) | 3.5 in | |
| October | 53°F (11°C) | 2.5 in | |
| November | 40°F (4°C) | 2.8 in | |
| December | 27°F (-3°C) | 2.3 in |
Mount Prospect has a seasonal temperature swing of 50°F / from 25°F in January to 75°F in July. Total annual precipitation is 35.6 inches, with August being the wettest month (4.2") and February the driest (1.4").