Illinois climate zones

Alexander County (Mixed-humid) · Bond County (Mixed-humid) · Calhoun County (Mixed-humid) · Christian County (Mixed-humid) · Clark County (Mixed-humid) · Clay County (Mixed-humid) · Clinton County (Mixed-humid) · Coles County (Mixed-humid) · Crawford County (Mixed-humid) · Cumberland County (Mixed-humid) · Edwards County (Mixed-humid) · Effingham County (Mixed-humid) · Fayette County (Mixed-humid) · Franklin County (Mixed-humid) · Gallatin County (Mixed-humid) · Greene County (Mixed-humid) · Hamilton County (Mixed-humid) · Hardin County (Mixed-humid) · Jackson County (Mixed-humid) · Jasper County (Mixed-humid) · Jefferson County (Mixed-humid) · Jersey County (Mixed-humid) · Johnson County (Mixed-humid) · Lawrence County (Mixed-humid) · Macoupin County (Mixed-humid) · Madison County (Mixed-humid) · Marion County (Mixed-humid) · Massac County (Mixed-humid) · Monroe County (Mixed-humid) · Montgomery County (Mixed-humid) · Perry County (Mixed-humid) · Pope County (Mixed-humid) · Pulaski County (Mixed-humid) · Randolph County (Mixed-humid) · Richland County (Mixed-humid) · Saline County (Mixed-humid) · Shelby County (Mixed-humid) · St. Clair County (Mixed-humid) · Union County (Mixed-humid) · Wabash County (Mixed-humid) · Washington County (Mixed-humid) · Wayne County (Mixed-humid) · White County (Mixed-humid) · Williamson County (Mixed-humid)

Adams County (Cold) · Boone County (Cold) · Brown County (Cold) · Bureau County (Cold) · Carroll County (Cold) · Cass County (Cold) · Champaign County (Cold) · Cook County (Cold) · De Witt County (Cold) · DeKalb County (Cold) · Douglas County (Cold) · DuPage County (Cold) · Edgar County (Cold) · Ford County (Cold) · Fulton County (Cold) · Grundy County (Cold) · Hancock County (Cold) · Henderson County (Cold) · Henry County (Cold) · Iroquois County (Cold) · Jo Daviess County (Cold) · Kane County (Cold) · Kankakee County (Cold) · Kendall County (Cold) · Knox County (Cold) · Lake County (Cold) · LaSalle County (Cold) · Lee County (Cold) · Livingston County (Cold) · Logan County (Cold) · Macon County (Cold) · Marshall County (Cold) · Mason County (Cold) · McDonough County (Cold) · McHenry County (Cold) · McLean County (Cold) · Menard County (Cold) · Mercer County (Cold) · Morgan County (Cold) · Moultrie County (Cold) · Ogle County (Cold) · Peoria County (Cold) · Piatt County (Cold) · Pike County (Cold) · Putnam County (Cold) · Rock Island County (Cold) · Sangamon County (Cold) · Schuyler County (Cold) · Scott County (Cold) · Stark County (Cold) · Stephenson County (Cold) · Tazewell County (Cold) · Vermilion County (Cold) · Warren County (Cold) · Whiteside County (Cold) · Will County (Cold) · Winnebago County (Cold) · Woodford County (Cold)