NOAA's National Centers for Environmental Information
County Mapping
County Average Temperature
October - December 1967
0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F
Illinois (Hover over a County)
Temp
Average Temperature
:
40.8°F
Anomaly:
-0.8°F
Rank:
36th Coldest
Mean:
41.6°F
*Signifies a tie
**Insufficient variability in the data record renders rank insignificant
County
|
Value | Anomaly | Rank 130 Years | 1901- |
|---|---|---|---|---|
| Adams County | 41.7°F | -0.5°F | 45 | 42.2°F |
| Alexander County | 46.3°F | -0.7°F | 40 | 47.1°F |
| Bond County | 43.2°F | -0.9°F | 36 | 44.1°F |
| Boone County | 36.7°F | -0.5°F | 46 | 37.2°F |
| Brown County | 41.2°F | -0.7°F | 37 | 42.0°F |
| Bureau County | 38.0°F | -0.6°F | 44 | 38.6°F |
| Calhoun County | 43.3°F | -0.5°F | 45 | 43.8°F |
| Carroll County | 36.6°F | -0.4°F | 46 | 37.0°F |
| Cass County | 40.9°F | -1.1°F | 33 | 42.0°F |
| Champaign County | 39.7°F | -1.2°F | 34 | 40.9°F |
| Christian County | 41.3°F | -1.2°F | 32 | 42.5°F |
| Clark County | 41.6°F | -1.3°F | 30 | 42.9°F |
| Clay County | 42.8°F | -1.2°F | 33 | 44.0°F |
| Clinton County | 43.7°F | -1.0°F | 34 | 44.7°F |
| Coles County | 41.0°F | -1.3°F | 30 | 42.3°F |
| Cook County | 38.6°F | -0.9°F | 38 | 39.5°F |
| Crawford County | 42.7°F | -1.1°F | 35 | 43.8°F |
| Cumberland County | 41.5°F | -1.4°F | 28 | 42.9°F |
| DeKalb County | 37.4°F | -0.5°F | 47 | 37.8°F |
| De Witt County | 39.9°F | -0.8°F | 41 | 40.8°F |
| Douglas County | 40.3°F | -1.4°F | 29 | 41.7°F |
| DuPage County | 38.0°F | -0.8°F | 41 | 38.8°F |
| Edgar County | 41.0°F | -1.1°F | 35 | 42.0°F |
| Edwards County | 44.4°F | -0.7°F | 42 | 45.1°F |
| Effingham County | 41.7°F | -1.5°F | 27 | 43.2°F |
| Fayette County | 42.5°F | -1.0°F | 31 | 43.6°F |
| Ford County | 39.0°F | -1.1°F | 36 | 40.1°F |
| Franklin County | 44.6°F | -0.9°F | 38 | 45.5°F |
| Fulton County | 39.9°F | -1.2°F | 32 | 41.1°F |
| Gallatin County | 45.4°F | -1.0°F | 39 | 46.4°F |
| Greene County | 43.1°F | -0.4°F | 46 | 43.5°F |
| Grundy County | 38.2°F | -1.0°F | 35 | 39.3°F |
| Hamilton County | 44.3°F | -1.1°F | 33 | 45.4°F |
| Hancock County | 40.9°F | -0.5°F | 49 | 41.4°F |
| Hardin County | 45.6°F | -1.1°F | 36 | 46.7°F |
| Henderson County | 39.8°F | -0.5°F | 49 | 40.3°F |
| Henry County | 38.3°F | -0.6°F | 45 | 38.9°F |
| Iroquois County | 39.0°F | -1.0°F | 37 | 40.1°F |
| Jackson County | 44.9°F | -0.7°F | 41 | 45.6°F |
| Jasper County | 42.2°F | -1.4°F | 31 | 43.5°F |
| Jefferson County | 44.1°F | -0.9°F | 36 | 45.0°F |
| Jersey County | 43.4°F | -0.7°F | 42 | 44.1°F |
| Jo Daviess County | 36.4°F | -0.1°F | 53 | 36.6°F |
| Johnson County | 45.2°F | -1.2°F | 31 | 46.4°F |
| Kane County | 37.5°F | -0.7°F | 43 | 38.2°F |
| Kankakee County | 38.8°F | -0.9°F | 38 | 39.7°F |
| Kendall County | 38.2°F | -0.8°F | 39 | 39.0°F |
| Knox County | 39.1°F | -0.5°F | 47 | 39.6°F |
| Lake County | 37.8°F | -0.6°F | 44 | 38.4°F |
| LaSalle County | 38.1°F | -0.8°F | 41 | 39.0°F |
| Lawrence County | 43.7°F | -0.9°F | 40 | 44.5°F |
| Lee County | 37.1°F | -0.7°F | 40 | 37.8°F |
| Livingston County | 38.5°F | -1.1°F | 36 | 39.6°F |
| Logan County | 40.5°F | -0.9°F | 37 | 41.4°F |
| McDonough County | 39.8°F | -1.0°F | 34 | 40.8°F |
| McHenry County | 36.9°F | -0.4°F | 48 | 37.3°F |
| McLean County | 39.2°F | -0.8°F | 42 | 39.9°F |
| Macon County | 40.4°F | -1.2°F | 34 | 41.7°F |
| Macoupin County | 42.5°F | -0.7°F | 39 | 43.2°F |
| Madison County | 44.1°F | -0.6°F | 41 | 44.7°F |
| Marion County | 43.1°F | -1.1°F | 30 | 44.3°F |
| Marshall County | 39.1°F | -0.4°F | 47 | 39.6°F |
| Mason County | 40.6°F | -1.2°F | 32 | 41.8°F |
| Massac County | 46.0°F | -1.2°F | 34 | 47.2°F |
| Menard County | 41.0°F | -1.0°F | 37 | 41.9°F |
| Mercer County | 38.8°F | -0.7°F | 48 | 39.4°F |
| Monroe County | 44.9°F | -0.7°F | 42 | 45.6°F |
| Montgomery County | 42.3°F | -0.9°F | 38 | 43.1°F |
| Morgan County | 41.6°F | -0.7°F | 40 | 42.2°F |
| Moultrie County | 40.7°F | -1.3°F | 30 | 42.0°F |
| Ogle County | 36.8°F | -0.6°F | 44 | 37.3°F |
| Peoria County | 39.6°F | -0.5°F | 43 | 40.2°F |
| Perry County | 44.5°F | -0.8°F | 41 | 45.2°F |
| Piatt County | 40.0°F | -1.1°F | 37 | 41.1°F |
| Pike County | 42.7°F | -0.1°F | 54 | 42.8°F |
| Pope County | 45.4°F | -1.2°F | 33 | 46.7°F |
| Pulaski County | 46.4°F | -0.8°F | 42 | 47.2°F |
| Putnam County | 39.0°F | -0.5°F | 47 | 39.5°F |
| Randolph County | 44.5°F | -0.9°F | 40 | 45.4°F |
| Richland County | 43.5°F | -0.9°F | 37 | 44.4°F |
| Rock Island County | 38.5°F | -0.5°F | 47 | 39.0°F |
| St. Clair County | 44.6°F | -0.7°F | 40 | 45.3°F |
| Saline County | 44.9°F | -1.2°F | 32 | 46.0°F |
| Sangamon County | 41.4°F | -0.8°F | 39 | 42.2°F |
| Schuyler County | 40.2°F | -1.4°F | 31 | 41.6°F |
| Scott County | 42.4°F | -0.4°F | 46 | 42.8°F |
| Shelby County | 41.4°F | -1.2°F | 30 | 42.6°F |
| Stark County | 38.6°F | -0.6°F | 43 | 39.2°F |
| Stephenson County | 36.2°F | -0.3°F | 54 | 36.5°F |
| Tazewell County | 39.9°F | -0.7°F | 40 | 40.6°F |
| Union County | 45.2°F | -0.9°F | 34 | 46.2°F |
| Vermilion County | 40.2°F | -1.0°F | 39 | 41.2°F |
| Wabash County | 44.3°F | -0.8°F | 37 | 45.2°F |
| Warren County | 39.3°F | -0.5°F | 49 | 39.8°F |
| Washington County | 44.1°F | -0.9°F | 39 | 44.9°F |
| Wayne County | 43.9°F | -0.9°F | 36 | 44.9°F |
| White County | 45.0°F | -0.8°F | 41 | 45.8°F |
| Whiteside County | 37.6°F | -0.5°F | 43 | 38.1°F |
| Will County | 38.8°F | -0.7°F | 43 | 39.5°F |
| Williamson County | 44.8°F | -1.0°F | 34 | 45.8°F |
| Winnebago County | 36.7°F | -0.5°F | 48 | 37.2°F |
| Woodford County | 38.9°F | -0.6°F | 45 | 39.6°F |
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: County Mapping, published August 2025, retrieved on August 15, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping
