NOAA's National Centers for Environmental Information
County Mapping
County Average Temperature
October - December 1898
0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F
Illinois (Hover over a County)
TempAverage Temperature: 37.7°F
Anomaly: -3.9°F
Rank: 5th Coldest
Mean: 41.6°F
County | Value | Anomaly | Rank 130 Years | 1901- |
|---|---|---|---|---|
| Adams County | 38.2°F | -4.0°F | 5 | 42.2°F |
| Alexander County | 43.7°F | -3.4°F | 4 | 47.1°F |
| Bond County | 40.1°F | -4.0°F | 4 | 44.1°F |
| Boone County | 33.4°F | -3.8°F | 7 | 37.2°F |
| Brown County | 38.1°F | -3.8°F | 6 | 42.0°F |
| Bureau County | 34.2°F | -4.5°F | 4 | 38.6°F |
| Calhoun County | 39.8°F | -4.0°F | 4 | 43.8°F |
| Carroll County | 32.2°F | -4.8°F | 4 | 37.0°F |
| Cass County | 38.2°F | -3.8°F | 6 | 42.0°F |
| Champaign County | 37.1°F | -3.8°F | 5 | 40.9°F |
| Christian County | 38.7°F | -3.8°F | 5 | 42.5°F |
| Clark County | 38.7°F | -4.1°F | 5 | 42.9°F |
| Clay County | 40.6°F | -3.4°F | 7 | 44.0°F |
| Clinton County | 41.1°F | -3.6°F | 5 | 44.7°F |
| Coles County | 38.1°F | -4.2°F | 5 | 42.3°F |
| Cook County | 36.5°F | -3.0°F | 11 | 39.5°F |
| Crawford County | 39.7°F | -4.0°F | 5 | 43.8°F |
| Cumberland County | 38.9°F | -4.0°F | 6 | 42.9°F |
| DeKalb County | 33.9°F | -3.9°F | 5 | 37.8°F |
| De Witt County | 36.5°F | -4.3°F | 5 | 40.8°F |
| Douglas County | 37.6°F | -4.1°F | 5 | 41.7°F |
| DuPage County | 35.7°F | -3.2°F | 9 | 38.8°F |
| Edgar County | 38.2°F | -3.9°F | 5 | 42.0°F |
| Edwards County | 41.6°F | -3.6°F | 7 | 45.1°F |
| Effingham County | 39.7°F | -3.4°F | 6 | 43.2°F |
| Fayette County | 39.9°F | -3.7°F | 4 | 43.6°F |
| Ford County | 36.1°F | -4.0°F | 5 | 40.1°F |
| Franklin County | 41.7°F | -3.8°F | 5 | 45.5°F |
| Fulton County | 37.2°F | -3.9°F | 6 | 41.1°F |
| Gallatin County | 43.2°F | -3.2°F | 7 | 46.4°F |
| Greene County | 39.5°F | -4.0°F | 4 | 43.5°F |
| Grundy County | 35.7°F | -3.6°F | 6 | 39.3°F |
| Hamilton County | 41.8°F | -3.6°F | 7 | 45.4°F |
| Hancock County | 37.1°F | -4.3°F | 5 | 41.4°F |
| Hardin County | 43.9°F | -2.8°F | 8 | 46.7°F |
| Henderson County | 35.6°F | -4.7°F | 4 | 40.3°F |
| Henry County | 34.5°F | -4.4°F | 5 | 38.9°F |
| Iroquois County | 36.7°F | -3.3°F | 8 | 40.1°F |
| Jackson County | 41.6°F | -4.0°F | 3 | 45.6°F |
| Jasper County | 39.9°F | -3.7°F | 6 | 43.5°F |
| Jefferson County | 41.3°F | -3.7°F | 5 | 45.0°F |
| Jersey County | 40.0°F | -4.0°F | 4 | 44.1°F |
| Jo Daviess County | 31.9°F | -4.6°F | 5 | 36.6°F |
| Johnson County | 43.2°F | -3.2°F | 5 | 46.4°F |
| Kane County | 34.6°F | -3.5°F | 7 | 38.2°F |
| Kankakee County | 36.4°F | -3.3°F | 8 | 39.7°F |
| Kendall County | 35.5°F | -3.6°F | 6 | 39.0°F |
| Knox County | 35.1°F | -4.5°F | 4 | 39.6°F |
| Lake County | 35.3°F | -3.1°F | 12 | 38.4°F |
| LaSalle County | 34.5°F | -4.4°F | 4 | 39.0°F |
| Lawrence County | 41.0°F | -3.5°F | 7 | 44.5°F |
| Lee County | 33.5°F | -4.3°F | 4 | 37.8°F |
| Livingston County | 35.2°F | -4.4°F | 4 | 39.6°F |
| Logan County | 37.4°F | -4.1°F | 5 | 41.4°F |
| McDonough County | 36.7°F | -4.1°F | 5 | 40.8°F |
| McHenry County | 33.8°F | -3.5°F | 9 | 37.3°F |
| McLean County | 35.5°F | -4.5°F | 5 | 39.9°F |
| Macon County | 37.7°F | -4.0°F | 5 | 41.7°F |
| Macoupin County | 39.2°F | -4.1°F | 4 | 43.2°F |
| Madison County | 40.8°F | -4.0°F | 4 | 44.7°F |
| Marion County | 40.7°F | -3.6°F | 6 | 44.3°F |
| Marshall County | 34.9°F | -4.6°F | 4 | 39.6°F |
| Mason County | 38.1°F | -3.7°F | 6 | 41.8°F |
| Massac County | 44.7°F | -2.5°F | 11 | 47.2°F |
| Menard County | 38.0°F | -3.9°F | 4 | 41.9°F |
| Mercer County | 34.7°F | -4.7°F | 4 | 39.4°F |
| Monroe County | 41.5°F | -4.1°F | 4 | 45.6°F |
| Montgomery County | 39.0°F | -4.1°F | 4 | 43.1°F |
| Morgan County | 38.2°F | -4.1°F | 4 | 42.2°F |
| Moultrie County | 37.9°F | -4.1°F | 5 | 42.0°F |
| Ogle County | 33.1°F | -4.3°F | 4 | 37.3°F |
| Peoria County | 35.8°F | -4.3°F | 4 | 40.2°F |
| Perry County | 41.4°F | -3.9°F | 5 | 45.2°F |
| Piatt County | 37.0°F | -4.1°F | 5 | 41.1°F |
| Pike County | 38.9°F | -3.9°F | 5 | 42.8°F |
| Pope County | 44.2°F | -2.5°F | 11 | 46.7°F |
| Pulaski County | 43.9°F | -3.2°F | 4 | 47.2°F |
| Putnam County | 34.9°F | -4.7°F | 4 | 39.5°F |
| Randolph County | 41.5°F | -3.9°F | 4 | 45.4°F |
| Richland County | 41.0°F | -3.4°F | 8 | 44.4°F |
| Rock Island County | 34.6°F | -4.4°F | 5 | 39.0°F |
| St. Clair County | 41.5°F | -3.8°F | 6 | 45.3°F |
| Saline County | 42.9°F | -3.2°F | 7 | 46.0°F |
| Sangamon County | 38.2°F | -4.0°F | 4 | 42.2°F |
| Schuyler County | 37.9°F | -3.7°F | 6 | 41.6°F |
| Scott County | 38.8°F | -4.0°F | 4 | 42.8°F |
| Shelby County | 38.8°F | -3.9°F | 5 | 42.6°F |
| Stark County | 34.6°F | -4.6°F | 4 | 39.2°F |
| Stephenson County | 31.7°F | -4.8°F | 3 | 36.5°F |
| Tazewell County | 36.4°F | -4.2°F | 4 | 40.6°F |
| Union County | 42.3°F | -3.9°F | 3 | 46.2°F |
| Vermilion County | 38.0°F | -3.2°F | 11 | 41.2°F |
| Wabash County | 41.7°F | -3.5°F | 7 | 45.2°F |
| Warren County | 35.2°F | -4.6°F | 4 | 39.8°F |
| Washington County | 41.5°F | -3.5°F | 5 | 44.9°F |
| Wayne County | 41.4°F | -3.4°F | 7 | 44.9°F |
| White County | 42.3°F | -3.4°F | 7 | 45.8°F |
| Whiteside County | 33.6°F | -4.5°F | 4 | 38.1°F |
| Will County | 36.5°F | -3.1°F | 12 | 39.5°F |
| Williamson County | 42.1°F | -3.7°F | 4 | 45.8°F |
| Winnebago County | 33.2°F | -4.0°F | 6 | 37.2°F |
| Woodford County | 35.1°F | -4.5°F | 4 | 39.6°F |
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: County Mapping, published April 2025, retrieved on April 16, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping
