County Mapping
County Average Temperature
March - May 2019
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 | 51.1°F | -0.9°F | 47 | 52.0°F |
Alexander County | 57.1°F | 0.6°F | 74 | 56.5°F |
Bond County | 53.5°F | 0.0°F | 58 | 53.5°F |
Boone County | 45.3°F | -1.3°F | 36 | 46.6°F |
Brown County | 51.0°F | -0.8°F | 49 | 51.8°F |
Bureau County | 47.3°F | -1.3°F | 39 | 48.6°F |
Calhoun County | 53.2°F | -0.2°F | 52 | 53.4°F |
Carroll County | 46.4°F | -0.7°F | 49 | 47.1°F |
Cass County | 50.7°F | -1.3°F | 37 | 52.0°F |
Champaign County | 50.4°F | 0.1°F | 58 | 50.3°F |
Christian County | 51.7°F | -0.3°F | 51 | 52.0°F |
Clark County | 52.5°F | 0.3°F | 61 | 52.1°F |
Clay County | 53.9°F | 0.4°F | 72 | 53.4°F |
Clinton County | 54.7°F | 0.5°F | 70 | 54.2°F |
Coles County | 51.7°F | 0.1°F | 59 | 51.7°F |
Cook County | 46.9°F | -0.5°F | 51 | 47.4°F |
Crawford County | 53.6°F | 0.5°F | 71 | 53.0°F |
Cumberland County | 52.4°F | 0.1°F | 62 | 52.3°F |
DeKalb County | 45.9°F | -1.3°F | 37 | 47.2°F |
De Witt County | 50.7°F | 0.4°F | 65 | 50.4°F |
Douglas County | 51.3°F | 0.2°F | 60 | 51.1°F |
DuPage County | 46.8°F | -0.6°F | 50 | 47.4°F |
Edgar County | 51.0°F | -0.3°F | 51 | 51.3°F |
Edwards County | 55.0°F | 0.6°F | 70 | 54.5°F |
Effingham County | 52.7°F | 0.0°F | 56 | 52.7°F |
Fayette County | 52.8°F | -0.2°F | 55 | 53.0°F |
Ford County | 49.2°F | -0.3°F | 52 | 49.5°F |
Franklin County | 55.3°F | 0.5°F | 70 | 54.8°F |
Fulton County | 50.1°F | -1.0°F | 45 | 51.1°F |
Gallatin County | 55.5°F | -0.3°F | 53 | 55.8°F |
Greene County | 52.6°F | -0.6°F | 48 | 53.2°F |
Grundy County | 48.2°F | -0.4°F | 52 | 48.7°F |
Hamilton County | 55.2°F | 0.3°F | 66 | 54.9°F |
Hancock County | 50.4°F | -0.9°F | 45 | 51.3°F |
Hardin County | 56.1°F | 0.1°F | 63 | 55.9°F |
Henderson County | 49.2°F | -1.1°F | 44 | 50.3°F |
Henry County | 47.8°F | -1.0°F | 46 | 48.8°F |
Iroquois County | 49.5°F | 0.2°F | 61 | 49.3°F |
Jackson County | 55.4°F | 0.3°F | 69 | 55.1°F |
Jasper County | 53.4°F | 0.4°F | 66 | 53.0°F |
Jefferson County | 54.8°F | 0.3°F | 69 | 54.4°F |
Jersey County | 53.6°F | -0.1°F | 57 | 53.6°F |
Jo Daviess County | 45.3°F | -1.2°F | 40 | 46.5°F |
Johnson County | 55.8°F | 0.2°F | 59 | 55.6°F |
Kane County | 46.1°F | -1.0°F | 41 | 47.1°F |
Kankakee County | 48.4°F | -0.3°F | 51 | 48.7°F |
Kendall County | 47.1°F | -1.1°F | 40 | 48.2°F |
Knox County | 48.2°F | -1.2°F | 40 | 49.5°F |
Lake County | 45.3°F | -0.7°F | 49 | 46.0°F |
LaSalle County | 47.6°F | -1.1°F | 42 | 48.6°F |
Lawrence County | 54.3°F | 0.4°F | 66 | 53.9°F |
Lee County | 46.7°F | -1.0°F | 43 | 47.7°F |
Livingston County | 48.2°F | -0.9°F | 39 | 49.1°F |
Logan County | 51.3°F | 0.1°F | 59 | 51.2°F |
McDonough County | 49.7°F | -1.1°F | 41 | 50.8°F |
McHenry County | 45.4°F | -0.8°F | 50 | 46.1°F |
McLean County | 49.7°F | 0.1°F | 63 | 49.6°F |
Macon County | 51.2°F | 0.0°F | 56 | 51.2°F |
Macoupin County | 52.4°F | -0.4°F | 51 | 52.8°F |
Madison County | 54.3°F | 0.2°F | 59 | 54.1°F |
Marion County | 53.8°F | 0.1°F | 60 | 53.7°F |
Marshall County | 48.8°F | -0.6°F | 51 | 49.4°F |
Mason County | 51.1°F | -0.6°F | 52 | 51.7°F |
Massac County | 57.0°F | 0.5°F | 73 | 56.4°F |
Menard County | 51.0°F | -0.7°F | 48 | 51.7°F |
Mercer County | 48.1°F | -1.4°F | 35 | 49.5°F |
Monroe County | 56.0°F | 1.0°F | 81 | 55.0°F |
Montgomery County | 52.0°F | -0.5°F | 47 | 52.6°F |
Morgan County | 51.0°F | -1.1°F | 43 | 52.1°F |
Moultrie County | 51.3°F | -0.2°F | 53 | 51.5°F |
Ogle County | 46.5°F | -0.7°F | 53 | 47.2°F |
Peoria County | 49.9°F | -0.1°F | 58 | 50.0°F |
Perry County | 55.1°F | 0.5°F | 71 | 54.6°F |
Piatt County | 50.8°F | 0.2°F | 61 | 50.6°F |
Pike County | 51.8°F | -0.7°F | 48 | 52.5°F |
Pope County | 55.9°F | 0.1°F | 59 | 55.8°F |
Pulaski County | 57.1°F | 0.6°F | 75 | 56.5°F |
Putnam County | 48.2°F | -1.2°F | 40 | 49.4°F |
Randolph County | 55.7°F | 0.8°F | 83 | 54.8°F |
Richland County | 54.1°F | 0.4°F | 68 | 53.8°F |
Rock Island County | 47.7°F | -1.3°F | 36 | 49.0°F |
St. Clair County | 55.3°F | 0.6°F | 73 | 54.7°F |
Saline County | 55.3°F | -0.1°F | 56 | 55.4°F |
Sangamon County | 51.2°F | -0.6°F | 47 | 51.9°F |
Schuyler County | 50.6°F | -1.0°F | 42 | 51.6°F |
Scott County | 51.6°F | -0.9°F | 45 | 52.5°F |
Shelby County | 51.8°F | -0.3°F | 51 | 52.1°F |
Stark County | 48.0°F | -1.1°F | 43 | 49.1°F |
Stephenson County | 45.6°F | -0.8°F | 49 | 46.4°F |
Tazewell County | 50.9°F | 0.4°F | 65 | 50.5°F |
Union County | 55.9°F | 0.3°F | 65 | 55.6°F |
Vermilion County | 50.0°F | -0.4°F | 48 | 50.4°F |
Wabash County | 54.9°F | 0.4°F | 63 | 54.5°F |
Warren County | 48.4°F | -1.4°F | 38 | 49.7°F |
Washington County | 54.6°F | 0.3°F | 62 | 54.3°F |
Wayne County | 55.0°F | 0.7°F | 78 | 54.2°F |
White County | 55.2°F | -0.1°F | 57 | 55.2°F |
Whiteside County | 47.2°F | -0.9°F | 43 | 48.1°F |
Will County | 47.7°F | -0.7°F | 47 | 48.4°F |
Williamson County | 55.4°F | 0.3°F | 68 | 55.1°F |
Winnebago County | 45.8°F | -1.1°F | 42 | 46.9°F |
Woodford County | 49.6°F | 0.2°F | 63 | 49.4°F |
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: County Mapping, published July 2025, retrieved on July 29, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping