Alden, IL
Full City Profile · Illinois · McHenry County County
2.3
/5.0
C
Fair
36
Population
277/sq mi density
47°F
Avg Temperature
C
Overall
2.3 / 5.0
Fair overall score based on economy, affordability, safety and education
C
Education
2.3 / 5.0
16.7% bachelor's degree or higher
Alden experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 21°F in January while summers reach 71°F in July. Annual precipitation totals 37.5 inches. The area receives 31.9 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
71°F Jul (21°C)
| Annual Average | 47.0°F |
| 13% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 71°F (21°C) |
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 |
| Good Days % | 66.9% |
| Unhealthy Days | 1 |
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) | 1.7 in | Coldest |
| February | 23°F (-5°C) | 1.7 in | Driest |
| March | 35°F (2°C) | 2.3 in | |
| April | 46°F (8°C) | 3.6 in | |
| May | 57°F (14°C) | 4.5 in | |
| June | 67°F (19°C) | 4.9 in | Wettest |
| July | 71°F (21°C) | 3.7 in | Warmest |
| August | 69°F (20°C) | 4.1 in | |
| September | 62°F (17°C) | 3.7 in | |
| October | 50°F (10°C) | 2.9 in | |
| November | 38°F (3°C) | 2.4 in | |
| December | 27°F (-3°C) | 2.0 in |
Alden has a seasonal temperature swing of 50°F / from 21°F in January to 71°F in July. Total annual precipitation is 37.5 inches, with June being the wettest month (4.9") and February the driest (1.7").