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Mason City, IL
Full City Profile · Illinois · Mason County County
3.2
/5.0
B
Good
2,094
Population
2,073/sq mi density
$64,250
Median Income
$32,801 per capita
$92,200
Home Value
$115,986 Zillow
$785
Median Rent
43.8% income on rent
52°F
Avg Temperature
275 sunny days/yr
422
Violent Crime/100K
1,125 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$64,250 median income, 2.2% unemployment
A+
Affordability
5.0 / 5.0
$92,200 home value, $785/mo rent
F
Safety
1.0 / 5.0
422 violent crimes/100K (11% above avg)
C+
Education
2.6 / 5.0
20.4% bachelor's degree or higher
Mason City experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 25°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.3 inches. The area receives 12.9 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 51.7°F |
| 4% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 578 ft (176 m) |
| Area | 1.0 sq mi (2.6 km²) |
| Population Density | 2,073/sq mi |
| Coordinates | 40.2022°N, 89.6971°W |
| Timezone | America/Chicago |
| County | Mason County County |
| Nearest Airport | General Downing - Peoria International (PIA) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 43.0 / 100 |
| Social Vulnerability | 52.9 / 100 |
| Community Resilience | 68.7 / 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 Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.5 in | Coldest, Driest |
| February | 29°F (-2°C) | 1.5 in | |
| March | 41°F (5°C) | 3.0 in | |
| April | 53°F (11°C) | 3.5 in | |
| May | 63°F (17°C) | 4.0 in | Wettest |
| June | 72°F (22°C) | 3.7 in | |
| July | 75°F (24°C) | 3.8 in | Warmest |
| August | 74°F (23°C) | 3.4 in | |
| September | 67°F (19°C) | 3.5 in | |
| October | 55°F (13°C) | 2.8 in | |
| November | 41°F (5°C) | 2.8 in | |
| December | 30°F (-1°C) | 2.6 in |
Mason City has a seasonal temperature swing of 50°F / from 25°F in January to 75°F in July. Total annual precipitation is 36.2 inches, with May being the wettest month (4.0") and January the driest (1.5").