Illinois Climate Data
Climate normals for 164 cities from 453 NOAA weather stations.
Avg Temperature
52°F (11°C)
Avg Precipitation
40.7"
Avg Snowfall
21.5"
Cities / Stations
164 / 453
Illinois Climate in Context
U.S. land-mean temperature anomaly (NOAA NCEI) tracked against global anomaly (NASA GISTEMP). Paris Agreement 1.5°C and 2.0°C thresholds shown as reference lines. Illinois sits within this national warming envelope; individual cities below show local readings against this trend.
- United States (incl. Illinois) +0.11 °C/decade
- Global (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Cities in Illinois
164 cities with climate data
| City | Avg Temp | High | Low | Precip | Snow | Comfort |
|---|---|---|---|---|---|---|
| Albion | 57°F | 67°F | 47°F | N/A | N/A | 62/100 |
| Aledo | 50°F | 61°F | 40°F | 39.1" | 21.8" | 62/100 |
| Alton - Melvin Price L&d | 56°F | 65°F | 46°F | 41.9" | N/A | 77/100 |
| Altona | 49°F | 60°F | 38°F | 39.4" | N/A | 67/100 |
| Anna | 59°F | 70°F | 47°F | 51.1" | 10.4" | 67/100 |
| Antioch | 49°F | 57°F | 40°F | N/A | N/A | 52/100 |
| Athens | 52°F | 63°F | 42°F | 38.4" | N/A | 67/100 |
| Aurora | 50°F | 59°F | 41°F | 39.5" | 27.9" | 62/100 |
| Avon | 49°F | 60°F | 39°F | 37.6" | 24.0" | 62/100 |
| Barrington | 48°F | 57°F | 39°F | 40.4" | 38.5" | 62/100 |
| Belleville Siu Rsch | 58°F | 69°F | 46°F | 43.4" | 11.2" | 77/100 |
| Bentley | 53°F | 63°F | 43°F | 40.1" | 23.1" | 62/100 |
| Benton | 56°F | 66°F | 47°F | N/A | N/A | 62/100 |
| Bloomington | 50°F | 60°F | 40°F | 40.4" | N/A | 67/100 |
| Brookport Dam | 57°F | 68°F | 47°F | 49.1" | 3.1" | 82/100 |
| Brownstown | 55°F | 64°F | 45°F | 41.2" | N/A | 67/100 |
| Cahokia | 56°F | 67°F | 46°F | 42.8" | 13.8" | 77/100 |
| Cahokia ST Louis | 57°F | 67°F | 46°F | 40.8" | N/A | 77/100 |
| Cairo | 58°F | 68°F | 48°F | 51.0" | N/A | 67/100 |
| Carbondale Sewage Plt | 56°F | 67°F | 45°F | 49.0" | 11.4" | 77/100 |
| Carbondale Southern IL | 56°F | 67°F | 46°F | 44.0" | N/A | 77/100 |
| Carlinville | 53°F | 64°F | 43°F | 40.0" | 16.5" | 67/100 |
| Carlyle Rsvr | 56°F | 66°F | 46°F | 45.9" | N/A | 77/100 |
| Carmi | 55°F | 67°F | 43°F | 48.3" | 11.7" | 77/100 |
| Casey | 54°F | 65°F | 43°F | 45.5" | 11.9" | 67/100 |
| Champaign | 51°F | 61°F | 41°F | 39.6" | N/A | 67/100 |
| Champaign Willard | 53°F | 63°F | 42°F | 37.0" | N/A | 67/100 |
| Channahon Dresden Isl Dam | 51°F | 61°F | 42°F | 37.2" | 18.4" | 67/100 |
| Charleston | 55°F | 66°F | 45°F | 43.8" | 19.0" | 77/100 |
| Chenoa | 51°F | 61°F | 40°F | 36.3" | 19.9" | 67/100 |
| Chicago Aurora Muni | 49°F | 60°F | 39°F | 33.8" | N/A | 67/100 |
| Chicago Botanic Garden | 50°F | 59°F | 40°F | 39.5" | 33.6" | 62/100 |
| Chicago Midway | 52°F | 60°F | 44°F | 34.4" | N/A | 67/100 |
| Chicago Midway AP | 52°F | 61°F | 44°F | 40.9" | 38.8" | 62/100 |
| Chicago Northerly IS | 51°F | 57°F | 44°F | N/A | N/A | 52/100 |
| Chicago Ohare | 51°F | 60°F | 43°F | 37.9" | 38.4" | 62/100 |
| Chicago Palwaukee | 51°F | 59°F | 42°F | 32.3" | N/A | 67/100 |
| Chicago Waukegan Rgnl | 48°F | 57°F | 39°F | 35.3" | N/A | 67/100 |
| Compton | 48°F | 58°F | 38°F | N/A | N/A | 52/100 |
| Congerville | 52°F | 62°F | 42°F | 37.5" | 22.3" | 62/100 |
| Crystal Lake | 49°F | 59°F | 39°F | 39.4" | 35.1" | 62/100 |
| Danville | 53°F | 63°F | 43°F | 43.2" | N/A | 67/100 |
| DE Kalb | 49°F | 58°F | 39°F | 37.3" | 33.1" | 62/100 |
| Decatur | 53°F | 63°F | 43°F | 36.4" | N/A | 67/100 |
| Decatur Wtp | 53°F | 62°F | 44°F | 40.4" | 13.6" | 67/100 |
| Dixon | 49°F | 59°F | 40°F | 40.5" | 31.2" | 62/100 |
| Dixon Springs Agric Ctr | 57°F | 68°F | 47°F | 50.5" | 7.2" | 67/100 |
| DU Quoin | 56°F | 66°F | 46°F | 47.7" | 11.9" | 77/100 |
| Dwight | 49°F | 60°F | 39°F | 37.7" | 23.3" | 62/100 |
| Effingham | 54°F | 65°F | 44°F | 44.0" | 14.6" | 67/100 |
| Elgin | 49°F | 59°F | 39°F | 39.9" | 32.1" | 62/100 |
| Elizabeth | 48°F | 58°F | 37°F | 39.4" | 30.2" | 62/100 |
| Fairfield Radio Wfiw | 57°F | 68°F | 47°F | 46.0" | N/A | 77/100 |
| Flora | 55°F | 66°F | 44°F | 48.0" | 11.6" | 77/100 |
| Freeport Waste Wtp | 48°F | 58°F | 38°F | 38.4" | 34.5" | 62/100 |
| Fulton L&d #13 | 50°F | 59°F | 41°F | 34.3" | N/A | 67/100 |
| Galena | 47°F | 57°F | 37°F | 39.6" | 37.9" | 62/100 |
| Galesburg | 50°F | 60°F | 41°F | 39.0" | 25.9" | 62/100 |
| Galva | 50°F | 60°F | 39°F | 38.7" | N/A | 67/100 |
| Geneseo | 51°F | 61°F | 41°F | 39.1" | 28.4" | 62/100 |
| Gibson City | 51°F | 61°F | 41°F | 37.7" | 18.3" | 67/100 |
| Gladstone Dam | 52°F | 61°F | 43°F | 37.2" | 16.9" | 67/100 |
| Golden | 52°F | 63°F | 42°F | N/A | N/A | 52/100 |
| Grand Chain Dam | 58°F | 68°F | 48°F | 49.4" | 7.2" | 77/100 |
| Grayville | 56°F | 67°F | 46°F | 50.0" | 11.8" | 77/100 |
| Harrisburg | 57°F | 68°F | 47°F | 47.6" | N/A | 77/100 |
| Havana | 53°F | 63°F | 42°F | 41.0" | 27.9" | 62/100 |
| Hennepin | 51°F | 61°F | 42°F | 38.6" | N/A | 67/100 |
| Hennepin Wtr Trmt Plt | 51°F | 62°F | 40°F | N/A | N/A | 52/100 |
| Hillsboro | 56°F | 66°F | 45°F | 42.1" | N/A | 77/100 |
| Hoopeston | 52°F | 62°F | 43°F | 40.9" | 20.3" | 62/100 |
| Illinois City Dam | 50°F | 60°F | 41°F | 36.4" | N/A | 67/100 |
| Iuka | 55°F | 65°F | 44°F | 44.7" | 12.0" | 67/100 |
| Jacksonville | 53°F | 64°F | 42°F | 39.3" | 16.2" | 67/100 |
| Jerseyville | 53°F | 64°F | 43°F | 42.2" | 12.5" | 67/100 |
| Joliet Brandon RD Dam | 50°F | 60°F | 41°F | 38.0" | 16.9" | 67/100 |
| Kankakee Metro Wastewater | 51°F | 61°F | 41°F | 41.7" | 20.7" | 62/100 |
| Kaskaskia Rvr Navigation Lock | 56°F | 67°F | 46°F | 42.8" | 4.3" | 82/100 |
| Kewanee | 50°F | 60°F | 39°F | 39.6" | 30.8" | 62/100 |
| Knoxville | 50°F | 60°F | 41°F | 40.5" | 25.4" | 62/100 |
| LA Harpe | 51°F | 61°F | 41°F | 39.1" | N/A | 67/100 |
| Lacon | 53°F | 63°F | 42°F | 38.4" | 24.6" | 62/100 |
| Lake Villa | 49°F | 58°F | 40°F | 37.8" | 43.4" | 62/100 |
| Lawrenceville | 56°F | 66°F | 46°F | 41.7" | N/A | 77/100 |
| Lincoln | 52°F | 63°F | 42°F | 39.8" | 19.3" | 67/100 |
| Lisle-morton Arboretum | 49°F | 60°F | 39°F | 40.2" | N/A | 67/100 |
| Little Red School Hse | 51°F | 62°F | 41°F | 41.4" | N/A | 67/100 |
| Marengo | 48°F | 58°F | 38°F | 37.6" | 30.8" | 62/100 |
| Marseilles Lock | 50°F | 60°F | 39°F | 39.0" | 25.0" | 62/100 |
| Mason City | 52°F | 62°F | 41°F | 39.3" | 12.9" | 67/100 |
| Mattoon | 54°F | 63°F | 44°F | 41.3" | 14.5" | 67/100 |
| Mattoon Coles CO | 53°F | 63°F | 44°F | 36.0" | N/A | 67/100 |
| MC Henry -wg Stratton L&d | 49°F | 59°F | 38°F | 37.0" | 34.5" | 62/100 |
| Mcleansboro | 55°F | 67°F | 44°F | 47.1" | 13.3" | 77/100 |
| Minonk | 51°F | 62°F | 41°F | 37.6" | 21.7" | 62/100 |
| Moline Quad City | 51°F | 62°F | 41°F | 38.3" | 36.1" | 62/100 |
| Monmouth | 51°F | 61°F | 41°F | 39.4" | 25.6" | 62/100 |
| Morris | 51°F | 60°F | 41°F | 38.8" | 24.7" | 62/100 |
| Morrison | 48°F | 59°F | 38°F | 38.3" | 31.5" | 62/100 |
| Morrisonville | 54°F | 64°F | 43°F | 38.1" | 16.2" | 67/100 |
| MT Carmel | 56°F | 66°F | 47°F | 48.7" | 8.9" | 77/100 |
| MT Carroll | 49°F | 60°F | 37°F | 40.3" | 33.4" | 62/100 |
| MT Vernon | 55°F | 64°F | 45°F | 45.0" | 10.4" | 67/100 |
| Mundelein | 48°F | 57°F | 39°F | 38.5" | 43.1" | 62/100 |
| Nashville | 55°F | 65°F | 45°F | 42.2" | 11.7" | 77/100 |
| Neoga | 54°F | 65°F | 43°F | 41.9" | N/A | 67/100 |
| New Boston Dam | 51°F | 61°F | 42°F | 36.3" | N/A | 67/100 |
| Newton | 55°F | 64°F | 45°F | 46.0" | 16.0" | 67/100 |
| Normal | 51°F | 62°F | 40°F | 39.4" | 20.1" | 62/100 |
| Ogden | 52°F | 62°F | 43°F | 41.2" | 25.0" | 62/100 |
| Olney | 54°F | 65°F | 44°F | 48.8" | 10.5" | 67/100 |
| Ottawa | 50°F | 60°F | 41°F | 36.2" | 23.7" | 62/100 |
| Palestine | 55°F | 65°F | 45°F | 46.3" | 11.6" | 77/100 |
| Pana | 54°F | 65°F | 43°F | 42.3" | 14.5" | 67/100 |
| Paris Stp | 51°F | 62°F | 41°F | 42.7" | 19.1" | 67/100 |
| Park Forest | 50°F | 59°F | 40°F | 42.1" | 28.2" | 62/100 |
| Paw Paw | 48°F | 58°F | 38°F | 36.8" | 30.1" | 62/100 |
| Paxton | 51°F | 61°F | 40°F | 37.9" | 18.3" | 67/100 |
| Peoria Gtr Peoria | 53°F | 62°F | 43°F | 37.5" | 26.2" | 62/100 |
| Perry | 53°F | 64°F | 42°F | 39.1" | 20.9" | 62/100 |
| Peru | 50°F | 60°F | 39°F | 38.0" | 28.5" | 62/100 |
| Petersburg | 52°F | 63°F | 42°F | 37.6" | 15.2" | 67/100 |
| Piper City | 52°F | 64°F | 40°F | 44.4" | 24.7" | 62/100 |
| Pittsfield #2 | 54°F | 65°F | 43°F | 40.5" | 15.6" | 67/100 |
| Polo | 49°F | 60°F | 39°F | 40.0" | N/A | 67/100 |
| Pontiac | 52°F | 61°F | 42°F | 37.0" | 25.1" | 62/100 |
| Prairie City | 52°F | 62°F | 41°F | 38.5" | 21.3" | 62/100 |
| Princeton | 50°F | 60°F | 40°F | 39.8" | 28.5" | 62/100 |
| Princeville | 51°F | 62°F | 40°F | 38.8" | 20.3" | 62/100 |
| Quincy Dam | 54°F | 63°F | 44°F | 36.5" | N/A | 67/100 |
| Quincy Rgnl | 53°F | 63°F | 44°F | 36.4" | N/A | 67/100 |
| Ramsey | 53°F | 63°F | 42°F | 42.5" | 12.8" | 67/100 |
| Rantoul | 52°F | 64°F | 41°F | 40.4" | N/A | 67/100 |
| Rend Lake Dam | 56°F | 66°F | 46°F | 46.0" | N/A | 77/100 |
| Robinson | 54°F | 65°F | 44°F | 45.5" | N/A | 67/100 |
| Rochelle | 48°F | 58°F | 38°F | 36.6" | N/A | 67/100 |
| Rock Island L&d | 50°F | 60°F | 41°F | 38.8" | N/A | 67/100 |
| Rockford Gtr Rockford | 49°F | 59°F | 40°F | 37.2" | 37.1" | 62/100 |
| Romeoville | 51°F | 60°F | 41°F | 41.1" | 33.2" | 62/100 |
| Rosiclare | 55°F | 66°F | 44°F | 50.9" | 3.3" | 62/100 |
| Rushville | 52°F | 61°F | 42°F | 40.9" | N/A | 67/100 |
| Salem | 55°F | 65°F | 45°F | 45.9" | 10.2" | 67/100 |
| Shabbona | 48°F | 58°F | 38°F | 37.4" | N/A | 67/100 |
| Shelbyville Dam | 54°F | 63°F | 44°F | 41.4" | N/A | 67/100 |
| Sidell | 52°F | 61°F | 42°F | 40.4" | 23.7" | 62/100 |
| Smithland L&d | 57°F | 67°F | 47°F | 49.3" | 3.8" | 82/100 |
| Sparta | 55°F | 66°F | 44°F | 45.6" | 10.6" | 77/100 |
| Springfield #2 | 53°F | 63°F | 43°F | 40.5" | N/A | 67/100 |
| Springfield Capital | 54°F | 64°F | 44°F | 38.0" | 21.8" | 62/100 |
| Stockton | 48°F | 58°F | 38°F | 38.7" | 35.7" | 62/100 |
| Streamwood | 50°F | 61°F | 38°F | 38.0" | 34.0" | 62/100 |
| Streator | 52°F | 62°F | 42°F | 39.4" | 26.4" | 62/100 |
| Sullivan | 53°F | 63°F | 43°F | 41.6" | 12.9" | 67/100 |
| Tuscola | 52°F | 62°F | 43°F | 40.5" | 16.9" | 67/100 |
| Vandalia | 54°F | 64°F | 44°F | 43.7" | N/A | 67/100 |
| Virden | 55°F | 64°F | 46°F | 38.4" | 16.1" | 67/100 |
| Walnut | 49°F | 59°F | 40°F | 36.8" | 35.9" | 62/100 |
| Watseka | 51°F | 62°F | 40°F | 38.4" | 17.1" | 67/100 |
| Waukegan | 48°F | 57°F | 40°F | N/A | N/A | 52/100 |
| West Chicago Dupage | 50°F | 59°F | 40°F | 33.2" | N/A | 67/100 |
| Wheaton | 51°F | 62°F | 41°F | 39.9" | 24.3" | 62/100 |
| White Hall | 53°F | 63°F | 43°F | 39.6" | 18.2" | 67/100 |
| Winchester | 53°F | 64°F | 42°F | 40.4" | N/A | 67/100 |
| Windsor | 53°F | 62°F | 43°F | 41.2" | 13.7" | 67/100 |
Source: NOAA National Centers for Environmental Information U.S. Climate Normals v1.0.1 · 1991-2020 Statewide aggregates for Illinois computed from 453 reporting stations.
Climate Insight: Illinois
Illinois's climate profile is aggregated from 164 cities and 453 NOAA weather stations reporting under the 1991–2020 U.S. Climate Normals program. The statewide average annual temperature sits at 52°F, which represents a population-weighted mean across all measured localities rather than any single city's reading. Because Illinois spans multiple latitudes, elevations, and proximities to large water bodies, local conditions can differ from this headline number by wide margins — coastal, valley, and mountain stations often diverge by ten degrees or more even within a single month.
Precipitation and snowfall averages round out the climatological picture. Across Illinois, annual precipitation averages 40.7 inches, with typical seasonal snowfall near 21.5 inches statewide. These numbers combine rain, sleet, and snow water-equivalent and describe the thirty-year normal rather than any particular recent year. Readers evaluating a specific destination should drill into one of the 164 individual city pages below — each city's climate varies based on local geography, and the statewide figures here are averages that mask meaningful intrastate differences.
For planning purposes, the city table above is sorted to help you compare averages side-by-side: annual mean temperature, average daily high and low, precipitation totals, snowfall, and PlainClimate's composite comfort score. A city's comfort score weighs temperature mildness, humidity, and extreme-weather frequency into a single 0–100 rating, which is especially useful when contrasting locations at different elevations or distances from the coast. Use these rankings as a starting point, then open each city page for monthly breakdowns, degree-day totals, frost dates, and humidity metrics that matter for gardening, energy budgeting, and relocation decisions.
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). For informational purposes only.
Read our methodology — how this data is sourced, computed, and verified.
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