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O'Fallon, MO
Full City Profile · Missouri
3.8
/5.0
B+
Good
92,697
Population
3,034/sq mi density
$107,203
Median Income
$47,429 per capita
$305,100
Home Value
$465,147 Zillow
$1,400
Median Rent
25.1% income on rent
55°F
Avg Temperature
267 sunny days/yr
127
Violent Crime/100K
1,133 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$107,203 median income, 1.9% unemployment
A+
Affordability
5.0 / 5.0
$305,100 home value, $1,400/mo rent
F
Safety
1.0 / 5.0
127 violent crimes/100K
A
Education
4.4 / 5.0
42.4% bachelor's degree or higher
O'Fallon experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 78°F in July. The area gets 267 sunny days per year. Annual precipitation totals 37.8 inches. The area receives 6.5 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
29°F Jan (-2°C)
78°F Jul (26°C)
| Annual Average | 54.7°F |
| 1% above US avg | |
| January Average | 29°F (-2°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 267 days/yr |
Geography
| Elevation | 548 ft (167 m) |
| Area | 30.6 sq mi (79.1 km²) |
| Population Density | 3,034/sq mi |
| Coordinates | 38.8106°N, 90.6999°W |
| Timezone | America/Chicago |
| Nearest Airport | St Louis Lambert International (STL) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 1.8 in | Coldest, Driest |
| February | 34°F (1°C) | 2.1 in | |
| March | 44°F (7°C) | 3.4 in | |
| April | 55°F (13°C) | 3.7 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 73°F (23°C) | 3.5 in | |
| July | 78°F (26°C) | 3.9 in | Warmest |
| August | 76°F (24°C) | 3.2 in | |
| September | 68°F (20°C) | 3.2 in | |
| October | 57°F (14°C) | 3.0 in | |
| November | 45°F (7°C) | 3.2 in | |
| December | 34°F (1°C) | 2.6 in |
O'Fallon has a seasonal temperature swing of 49°F / from 29°F in January to 78°F in July. Total annual precipitation is 37.8 inches, with May being the wettest month (4.3") and January the driest (1.8").