Annual mean
Annual mean of daily highs
Annual mean of daily lows
Madison city, Illinois
Official LSAD Designation: Madison city • Census GEOID: 1745993
• Madison County / St. Clair County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Madison city.
Reference Weather Station: CAHOKIA ST LOUIS AP, IL US (ID: USW00003960)
• Located 8.5 miles from community center
• Elevation: 125.9 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 40.2° | 24.1° | 32.1° | 2.46" |
| February | 45.6° | 27.6° | 36.6° | 1.96" |
| March | 56.3° | 36.0° | 46.1° | 3.27" |
| April | 67.5° | 45.5° | 56.5° | 4.48" |
| May | 76.7° | 56.5° | 66.6° | 4.84" |
| June | 85.7° | 64.7° | 75.2° | 4.36" |
| July | 89.0° | 68.8° | 78.9° | 3.70" |
| August | 87.8° | 66.1° | 76.9° | 3.68" |
| September | 80.7° | 57.1° | 68.9° | 3.36" |
| October | 69.4° | 46.1° | 57.7° | 3.07" |
| November | 55.3° | 35.9° | 45.6° | 3.34" |
| December | 44.3° | 28.6° | 36.4° | 2.32" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station CAHOKIA ST LOUIS AP, IL US (ID: USW00003960) • 8.5 miles from community center .
This is the same reference station used for monthly normals.
Source: NOAA NCEI Global Summary of the Year.
Annual temperature data table (°F)
| Year | Annual mean (°F) | Annual mean of daily highs (°F) | Annual mean of daily lows (°F) |
|---|---|---|---|
| 2010 | 55.7 | 66.1 | 45.2 |
| 2011 | 56.7 | 66.9 | 46.5 |
| 2012 | 59.4 | 70.8 | 47.9 |
| 2013 | 54.8 | 65.4 | 44.2 |
| 2014 | 54.3 | 64.7 | 43.8 |
| 2015 | 57.5 | 67.8 | 47.2 |
| 2016 | 59.1 | 69.4 | 48.9 |
| 2017 | 59.1 | 70.6 | 47.6 |
| 2018 | 56.3 | 66.5 | 46.1 |
| 2019 | 56.0 | 66.1 | 45.9 |
| 2020 | 56.5 | 66.9 | 46.0 |
| 2021 | 56.9 | 67.5 | 46.4 |
| 2022 | 55.9 | 67.1 | 44.7 |
| 2023 | 58.5 | 69.9 | 47.1 |
| 2024 | 59.6 | 70.7 | 48.6 |
| 2025 | 57.3 | 68.3 | 46.4 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.