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Weather & Climate in Quincy, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Quincy experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 27°F in January while summers reach 77°F in July. The area gets 302 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 36.5 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 633 feet.
Temperature
27°F Jan (-3°C)
77°F Jul (25°C)
| Annual Average | 53.7°F |
| 1% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 633 ft (193 m) |
| Area | 15.9 sq mi (41.2 km²) |
| Population Density | 2,462/sq mi |
| Coordinates | 39.9337°N, 91.3793°W |
| Timezone | America/Chicago |
| County | Adams County County |
| Nearest Airport | Quincy Regional-Baldwin Field (UIN) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 64.2 / 100 |
| Social Vulnerability | 29.6 / 100 |
| Community Resilience | 92.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.9.
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 65 km | 5 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 125 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
414 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 8 fatalities, 214 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 12, 2006 | EF4 | 87 km | 29.0 mi | 0 |
| May 13, 1995 | EF4 | 72 km | 50.0 mi | 0 |
| Apr 20, 1973 | EF4 | 94 km | 3.8 mi | 1 |
| Apr 4, 2023 | EF3 | 100 km | 19.9 mi | 0 |
| May 27, 2019 | EF3 | 97 km | 7.3 mi | 0 |
| Mar 13, 2006 | EF3 | 98 km | 44.5 mi | 0 |
| May 10, 2003 | EF3 | 42 km | 12.0 mi | 0 |
| Apr 8, 1999 | EF3 | 47 km | 7.5 mi | 0 |
| Jun 21, 1981 | EF3 | 72 km | 8.8 mi | 1 |
| Apr 13, 1974 | EF3 | 76 km | 0.1 mi | 0 |
| Apr 13, 1974 | EF3 | 38 km | 11.0 mi | 0 |
| Sep 30, 1973 | EF3 | 51 km | 0.1 mi | 0 |
| May 1, 1973 | EF3 | 62 km | 3.6 mi | 2 |
| Apr 20, 1973 | EF3 | 79 km | 9.5 mi | 0 |
| Jun 12, 1970 | EF3 | 95 km | 16.0 mi | 0 |
| Jun 12, 1970 | EF3 | 97 km | 8.5 mi | 0 |
| Jan 24, 1967 | EF3 | 82 km | 4.3 mi | 1 |
| Apr 21, 1964 | EF3 | 77 km | 14.1 mi | 0 |
| May 14, 1961 | EF3 | 25 km | 127.1 mi | 0 |
| Apr 24, 1961 | EF3 | 33 km | 64.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 1.5 in | Coldest, Driest |
| February | 31°F (-1°C) | 1.5 in | |
| March | 42°F (5°C) | 3.1 in | |
| April | 54°F (12°C) | 3.7 in | |
| May | 64°F (18°C) | 4.5 in | |
| June | 73°F (23°C) | 3.8 in | |
| July | 77°F (25°C) | 4.6 in | Warmest, Wettest |
| August | 75°F (24°C) | 3.7 in | |
| September | 67°F (20°C) | 4.3 in | |
| October | 56°F (13°C) | 3.2 in | |
| November | 42°F (6°C) | 2.8 in | |
| December | 31°F (-1°C) | 2.3 in |
Quincy has a seasonal temperature swing of 50°F / from 27°F in January to 77°F in July. Total annual precipitation is 38.8 inches, with July being the wettest month (4.6") and January the driest (1.5").