Annual mean
Annual mean of daily highs
Annual mean of daily lows
Dewey CDP, Illinois
Official LSAD Designation: Dewey CDP • Census GEOID: 1719746
• Champaign County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Dewey CDP.
Reference Weather Station: RANTOUL, IL US (ID: USW00014806)
• Located 6.6 miles from community center
• Elevation: 225.6 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 34.4° | 15.8° | 25.1° | 2.54" |
| February | 39.6° | 19.6° | 29.6° | 2.01" |
| March | 51.4° | 29.3° | 40.4° | 2.58" |
| April | 64.3° | 39.6° | 51.9° | 3.98" |
| May | 75.4° | 51.3° | 63.3° | 4.33" |
| June | 84.9° | 61.7° | 73.3° | 4.61" |
| July | 87.5° | 64.1° | 75.8° | 4.44" |
| August | 85.9° | 61.6° | 73.7° | 3.86" |
| September | 80.7° | 54.3° | 67.5° | 3.28" |
| October | 67.3° | 42.1° | 54.7° | 3.32" |
| November | 52.3° | 31.4° | 41.8° | 3.19" |
| December | 39.8° | 22.1° | 30.9° | 2.21" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station RANTOUL, IL US (ID: USW00014806) • 6.6 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 | 52.6 | 63.4 | 41.9 |
| 2011 | 52.5 | 62.7 | 42.4 |
| 2012 | 56.1 | 67.4 | 44.8 |
| 2013 | 51.5 | 61.7 | 41.3 |
| 2014 | 49.6 | 59.8 | 39.3 |
| 2015 | 52.3 | 63.1 | 41.6 |
| 2016 | 54.4 | 65.1 | 43.7 |
| 2017 | 54.9 | 65.9 | 43.9 |
| 2018 | 52.6 | 63.3 | 42.0 |
| 2019 | 50.8 | 61.2 | 40.5 |
| 2020 | 52.2 | 62.0 | 42.4 |
| 2021 | 53.2 | 62.9 | 43.4 |
| 2022 | 51.1 | 62.2 | 39.9 |
| 2023 | 54.1 | 65.0 | 43.3 |
| 2024 | Unavailable | Unavailable | Unavailable |
| 2025 | Unavailable | Unavailable | Unavailable |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.