NOAA's National Centers for Environmental Information
County Mapping
County Average Temperature
March - May 1949
0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F
Illinois (Hover over a County)
Temp
Average Temperature
:
--
Anomaly:
--
Rank:
-- Coldest
Mean:
--
*Signifies a tie
**Insufficient variability in the data record renders rank insignificant
County
|
Value | Anomaly | Rank 131 Years | 1901- |
|---|---|---|---|---|
| Adams County | 52.5°F | 0.5°F | 73 | 52.0°F |
| Alexander County | 56.5°F | -0.1°F | 52 | 56.5°F |
| Bond County | 53.4°F | 0.0°F | 55 | 53.5°F |
| Boone County | 47.0°F | 0.4°F | 72 | 46.6°F |
| Brown County | 52.1°F | 0.3°F | 64 | 51.8°F |
| Bureau County | 49.7°F | 1.1°F | 82 | 48.6°F |
| Calhoun County | 53.3°F | -0.1°F | 55 | 53.4°F |
| Carroll County | 47.4°F | 0.3°F | 64 | 47.1°F |
| Cass County | 52.4°F | 0.4°F | 71 | 52.0°F |
| Champaign County | 51.2°F | 0.9°F | 81 | 50.3°F |
| Christian County | 52.4°F | 0.4°F | 66 | 52.0°F |
| Clark County | 52.7°F | 0.5°F | 74 | 52.1°F |
| Clay County | 53.9°F | 0.5°F | 72 | 53.4°F |
| Clinton County | 53.8°F | -0.4°F | 51 | 54.2°F |
| Coles County | 52.2°F | 0.6°F | 72 | 51.7°F |
| Cook County | 47.5°F | 0.1°F | 63 | 47.4°F |
| Crawford County | 53.4°F | 0.3°F | 62 | 53.0°F |
| Cumberland County | 52.8°F | 0.5°F | 73 | 52.3°F |
| DeKalb County | 47.1°F | 0.0°F | 60 | 47.2°F |
| De Witt County | 51.3°F | 1.0°F | 82 | 50.4°F |
| Douglas County | 51.9°F | 0.8°F | 81 | 51.1°F |
| DuPage County | 47.3°F | -0.1°F | 59 | 47.4°F |
| Edgar County | 52.0°F | 0.7°F | 78 | 51.3°F |
| Edwards County | 54.5°F | 0.1°F | 53 | 54.5°F |
| Effingham County | 53.1°F | 0.4°F | 66 | 52.7°F |
| Fayette County | 53.2°F | 0.2°F | 61 | 53.0°F |
| Ford County | 49.9°F | 0.4°F | 71 | 49.5°F |
| Franklin County | 54.8°F | 0.0°F | 57 | 54.8°F |
| Fulton County | 51.5°F | 0.4°F | 69 | 51.1°F |
| Gallatin County | 55.3°F | -0.5°F | 46 | 55.8°F |
| Greene County | 53.3°F | 0.1°F | 62 | 53.2°F |
| Grundy County | 48.9°F | 0.3°F | 65 | 48.7°F |
| Hamilton County | 55.1°F | 0.2°F | 60 | 54.9°F |
| Hancock County | 52.1°F | 0.8°F | 78 | 51.3°F |
| Hardin County | 55.4°F | -0.5°F | 46 | 55.9°F |
| Henderson County | 51.1°F | 0.8°F | 76 | 50.3°F |
| Henry County | 49.6°F | 0.8°F | 77 | 48.8°F |
| Iroquois County | 49.7°F | 0.3°F | 68 | 49.3°F |
| Jackson County | 54.8°F | -0.3°F | 51 | 55.1°F |
| Jasper County | 53.6°F | 0.6°F | 75 | 53.0°F |
| Jefferson County | 54.3°F | -0.2°F | 56 | 54.4°F |
| Jersey County | 53.6°F | -0.1°F | 57 | 53.6°F |
| Jo Daviess County | 46.9°F | 0.3°F | 68 | 46.5°F |
| Johnson County | 55.2°F | -0.5°F | 47 | 55.6°F |
| Kane County | 46.9°F | -0.2°F | 58 | 47.1°F |
| Kankakee County | 49.2°F | 0.5°F | 70 | 48.7°F |
| Kendall County | 48.2°F | 0.0°F | 61 | 48.2°F |
| Knox County | 50.0°F | 0.6°F | 71 | 49.5°F |
| Lake County | 45.9°F | -0.1°F | 63 | 46.0°F |
| LaSalle County | 49.0°F | 0.4°F | 68 | 48.6°F |
| Lawrence County | 54.1°F | 0.2°F | 57 | 53.9°F |
| Lee County | 48.1°F | 0.4°F | 71 | 47.7°F |
| Livingston County | 49.7°F | 0.6°F | 72 | 49.1°F |
| Logan County | 52.0°F | 0.9°F | 77 | 51.2°F |
| McDonough County | 51.5°F | 0.7°F | 76 | 50.8°F |
| McHenry County | 46.4°F | 0.3°F | 70 | 46.1°F |
| McLean County | 50.5°F | 0.9°F | 81 | 49.6°F |
| Macon County | 52.0°F | 0.8°F | 79 | 51.2°F |
| Macoupin County | 52.8°F | 0.0°F | 58 | 52.8°F |
| Madison County | 54.0°F | -0.1°F | 54 | 54.1°F |
| Marion County | 53.5°F | -0.2°F | 55 | 53.7°F |
| Marshall County | 50.4°F | 1.0°F | 80 | 49.4°F |
| Mason County | 52.3°F | 0.6°F | 72 | 51.7°F |
| Massac County | 56.1°F | -0.3°F | 48 | 56.4°F |
| Menard County | 52.3°F | 0.6°F | 74 | 51.7°F |
| Mercer County | 50.2°F | 0.7°F | 73 | 49.5°F |
| Monroe County | 54.7°F | -0.3°F | 51 | 55.0°F |
| Montgomery County | 52.7°F | 0.2°F | 60 | 52.6°F |
| Morgan County | 52.5°F | 0.4°F | 71 | 52.1°F |
| Moultrie County | 52.1°F | 0.6°F | 74 | 51.5°F |
| Ogle County | 47.4°F | 0.2°F | 68 | 47.2°F |
| Peoria County | 50.7°F | 0.7°F | 70 | 50.0°F |
| Perry County | 54.3°F | -0.3°F | 52 | 54.6°F |
| Piatt County | 51.5°F | 0.9°F | 82 | 50.6°F |
| Pike County | 52.8°F | 0.3°F | 63 | 52.5°F |
| Pope County | 55.3°F | -0.5°F | 44 | 55.8°F |
| Pulaski County | 56.3°F | -0.1°F | 50 | 56.5°F |
| Putnam County | 50.3°F | 0.9°F | 80 | 49.4°F |
| Randolph County | 54.4°F | -0.4°F | 49 | 54.8°F |
| Richland County | 54.2°F | 0.4°F | 70 | 53.8°F |
| Rock Island County | 49.6°F | 0.6°F | 70 | 49.0°F |
| St. Clair County | 54.4°F | -0.3°F | 51 | 54.7°F |
| Saline County | 55.0°F | -0.4°F | 49 | 55.4°F |
| Sangamon County | 52.3°F | 0.4°F | 68 | 51.9°F |
| Schuyler County | 52.0°F | 0.4°F | 67 | 51.6°F |
| Scott County | 52.9°F | 0.4°F | 68 | 52.5°F |
| Shelby County | 52.7°F | 0.6°F | 72 | 52.1°F |
| Stark County | 50.2°F | 1.1°F | 84 | 49.1°F |
| Stephenson County | 46.7°F | 0.3°F | 70 | 46.4°F |
| Tazewell County | 51.2°F | 0.8°F | 74 | 50.5°F |
| Union County | 55.3°F | -0.3°F | 49 | 55.6°F |
| Vermilion County | 51.0°F | 0.6°F | 74 | 50.4°F |
| Wabash County | 54.5°F | 0.0°F | 53 | 54.5°F |
| Warren County | 50.4°F | 0.6°F | 72 | 49.7°F |
| Washington County | 53.9°F | -0.4°F | 52 | 54.3°F |
| Wayne County | 54.4°F | 0.2°F | 59 | 54.2°F |
| White County | 55.1°F | -0.1°F | 52 | 55.2°F |
| Whiteside County | 48.6°F | 0.4°F | 68 | 48.1°F |
| Will County | 48.8°F | 0.4°F | 71 | 48.4°F |
| Williamson County | 54.7°F | -0.4°F | 49 | 55.1°F |
| Winnebago County | 47.3°F | 0.4°F | 73 | 46.9°F |
| Woodford County | 50.4°F | 1.0°F | 80 | 49.4°F |
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: County Mapping, published July 2025, retrieved on August 4, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping
