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Alden, IL
Full City Profile · Illinois · McHenry County County
1.7
/5.0
D
Poor
36
Population
277/sq mi density
48°F
Avg Temperature
260 sunny days/yr
109
Violent Crime/100K
1,118 property/100K
D
Overall
1.7 / 5.0
Below average overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
109 violent crimes/100K
C
Education
2.3 / 5.0
16.7% bachelor's degree or higher
Alden experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 21°F in January while summers reach 73°F in July. The area gets 260 sunny days per year. Annual precipitation totals 37.6 inches. The area receives 30.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 48.2°F |
| 11% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,006 ft (307 m) |
| Area | 0.1 sq mi (0.3 km²) |
| Population Density | 277/sq mi |
| Coordinates | 42.4586°N, 88.5185°W |
| Timezone | America/Chicago |
| County | McHenry County County |
| Nearest Airport | Southern Wisconsin Regional (JVL) 29 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0484 ppm |
| PM2.5 (Fine Particles) | 9.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 84.0 / 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 Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.5 in | Coldest |
| February | 23°F (-5°C) | 1.3 in | Driest |
| March | 34°F (1°C) | 2.5 in | |
| April | 47°F (8°C) | 3.6 in | |
| May | 58°F (15°C) | 3.6 in | |
| June | 68°F (20°C) | 4.1 in | |
| July | 73°F (23°C) | 4.1 in | Warmest |
| August | 70°F (21°C) | 4.2 in | Wettest |
| September | 62°F (17°C) | 3.9 in | |
| October | 50°F (10°C) | 2.6 in | |
| November | 37°F (3°C) | 2.7 in | |
| December | 24°F (-4°C) | 2.0 in |
Alden has a seasonal temperature swing of 52°F / from 21°F in January to 73°F in July. Total annual precipitation is 36.1 inches, with August being the wettest month (4.2") and February the driest (1.3").