Quincy, IL
Climate overview — based on NOAA 1991-2020 normals from QUINCY DAM 21, IL US.
Year-round temperatures (°F)
Climate summary
Quincy has an annual average temperature of 53.7°F with about 36.5 inches of precipitation per year. The warmest month is July (average high 87.2°F), and the coldest is January (average low 18.9°F). May is typically the wettest month (4.80 in) and January the driest (1.66 in).
Best time to visit Quincy
Full guide →Climate change signal
All-time records →70 of 366 (19.1%) of Quincy's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1930s | 32 | |
| 1940s | 40 | |
| 1950s | 0 | |
| 1960s | 0 | |
| 1970s | 15 | |
| 1980s | 50 | |
| 1990s | 41 | |
| 2000s | 72 | |
| 2010s | 76 | |
| 2020s | 40 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 35.1°F | 18.9°F | 27.0°F | 1.66 in | — | 7 |
| February | 40.4°F | 22.7°F | 31.6°F | 1.91 in | — | 7 |
| March | 51.8°F | 32.0°F | 41.9°F | 2.48 in | — | 9 |
| April | 64.4°F | 42.9°F | 53.6°F | 4.22 in | — | 11 |
| May | 74.1°F | 54.2°F | 64.1°F | 4.80 in | — | 11 |
| June | 83.4°F | 63.9°F | 73.6°F | 4.12 in | — | 9 |
| July | 87.2°F | 67.6°F | 77.4°F | 3.64 in | — | 8 |
| August | 85.6°F | 65.7°F | 75.7°F | 3.33 in | — | 7 |
| September | 78.9°F | 57.1°F | 68.0°F | 3.37 in | — | 6 |
| October | 66.6°F | 45.4°F | 56.0°F | 2.65 in | — | 8 |
| November | 52.5°F | 33.8°F | 43.2°F | 2.57 in | — | 7 |
| December | 40.2°F | 24.5°F | 32.3°F | 1.73 in | — | 7 |
Climate twins of Quincy
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).