Annual mean
Annual mean of daily highs
Annual mean of daily lows
Alexander CDP, Illinois
Official LSAD Designation: Alexander CDP • Census GEOID: 1700659
• Morgan County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Alexander CDP.
Reference Weather Station: JACKSONVILLE 2E, IL US (ID: USC00114442)
• Located 8.6 miles from community center
• Elevation: 185.9 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 36.0° | 18.1° | 27.1° | 1.93" |
| February | 41.1° | 21.4° | 31.2° | 1.72" |
| March | 52.4° | 30.1° | 41.2° | 2.81" |
| April | 64.9° | 40.3° | 52.6° | 4.27" |
| May | 74.8° | 51.7° | 63.3° | 4.82" |
| June | 83.3° | 60.8° | 72.1° | 4.89" |
| July | 86.5° | 64.0° | 75.3° | 3.96" |
| August | 85.2° | 61.7° | 73.4° | 3.39" |
| September | 80.0° | 53.5° | 66.7° | 3.50" |
| October | 67.7° | 42.3° | 55.0° | 2.97" |
| November | 53.0° | 31.9° | 42.5° | 3.01" |
| December | 41.2° | 23.3° | 32.2° | 1.98" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station JACKSONVILLE 2E, IL US (ID: USC00114442) • 8.6 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 | 53.3 | 64.0 | 42.5 |
| 2011 | 53.8 | 64.5 | 43.1 |
| 2012 | 56.5 | 68.5 | 44.6 |
| 2013 | 51.8 | 62.5 | 41.1 |
| 2014 | 50.0 | 60.8 | 39.2 |
| 2015 | 53.5 | 64.5 | 42.5 |
| 2016 | 55.4 | 66.1 | 44.7 |
| 2017 | 54.8 | 66.7 | 43.0 |
| 2018 | 52.4 | 63.2 | 41.5 |
| 2019 | Unavailable | Unavailable | Unavailable |
| 2020 | 53.3 | 64.2 | 42.5 |
| 2021 | 53.9 | 64.4 | 43.5 |
| 2022 | 52.1 | 63.4 | 40.8 |
| 2023 | 55.0 | 66.7 | 43.2 |
| 2024 | 55.7 | 67.1 | 44.3 |
| 2025 | 54.3 | 65.9 | 42.7 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.