Annual mean
Annual mean of daily highs
Annual mean of daily lows
Byron city, Illinois
Official LSAD Designation: Byron city • Census GEOID: 1710240
• Ogle County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Byron city.
Reference Weather Station: ROCKFORD GTR ROCKFORD AP, IL US (ID: USW00094822)
• Located 9.9 miles from community center
• Elevation: 222.5 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 29.1° | 14.5° | 21.8° | 1.60" |
| February | 33.4° | 17.8° | 25.6° | 1.63" |
| March | 46.5° | 28.1° | 37.3° | 2.40" |
| April | 59.7° | 38.5° | 49.1° | 3.75" |
| May | 71.2° | 49.5° | 60.4° | 4.18" |
| June | 80.7° | 59.6° | 70.1° | 5.23" |
| July | 83.9° | 63.6° | 73.8° | 3.81" |
| August | 82.0° | 61.8° | 71.9° | 4.19" |
| September | 75.3° | 53.5° | 64.4° | 3.62" |
| October | 62.3° | 41.8° | 52.0° | 2.63" |
| November | 47.1° | 30.5° | 38.8° | 2.27" |
| December | 34.3° | 20.2° | 27.3° | 1.93" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station ROCKFORD GTR ROCKFORD AP, IL US (ID: USW00094822) • 9.9 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 | 50.2 | 60.0 | 40.4 |
| 2011 | 50.1 | 59.4 | 40.9 |
| 2012 | 53.1 | 63.8 | 42.3 |
| 2013 | 47.8 | 57.6 | 38.0 |
| 2014 | 46.1 | 55.8 | 36.3 |
| 2015 | 49.8 | 59.6 | 40.0 |
| 2016 | 51.9 | 61.1 | 42.7 |
| 2017 | 51.2 | 61.0 | 41.4 |
| 2018 | 48.7 | 58.1 | 39.2 |
| 2019 | 48.7 | 57.8 | 39.6 |
| 2020 | 51.4 | 61.2 | 41.6 |
| 2021 | 52.0 | 62.1 | 42.0 |
| 2022 | 49.2 | 59.5 | 38.9 |
| 2023 | 51.3 | 61.4 | 41.2 |
| 2024 | 52.9 | 63.3 | 42.4 |
| 2025 | 50.2 | 60.8 | 39.5 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.