NOAA climate atlas · updated August 2026
Illinois Climate Data
Climate normals for 163 station-mapped locations, each from its primary station in Illinois's 453-station NOAA network.
- average temperature
- 52°F (11°C)52.2°F · fleet p50 52.2°F · n=50
- At national median
- annual precipitation
- 40.7"40.7 inches · fleet p50 43.7 inches · n=50
- Drier than median
- annual snowfall
- 21.3"21.3 inches · fleet p50 24.7 inches · n=50
- Less snow than median
- locations / stations
- 163 / 453State coverage: 163 locations / 453 stations. Benchmark context: this profile's measured location and NOAA-station counts.
- State coverage
Illinois's climate in one line
Illinois averages 52°F a year - cooler than 52% of U.S. states, spanning Galena at 47°F to Anna at 59°F.
- 52°F
- statewide average · 48th percentile of states
- 41"
- average annual precipitation
- 83/100
- most comfortable: Brookport Dam
- 163
- station-mapped locations · 453 NOAA stations
Statewide figures are simple averages across 163 station-mapped locations (each from its primary NOAA station), local conditions vary widely by elevation and coast distance.
How Illinois ranks among all 50 states
Illinois's average temperature vs. all U.S. states
Statewide annual mean temperature, NOAA 1991–2020 normals
52°F 48th percentile cooler than 52% of 50 U.S. states
- 30°F–35°F: 1 US states (2%). Below this entry.
- 35°F–40°F: 0 US states (0%). Below this entry.
- 40°F–45°F: 8 US states (16%). Below this entry.
- 45°F–50°F: 10 US states (20%). Below this entry.
- 50°F–55°F: 12 US states (24%). This entry sits in this band.
- 55°F–60°F: 8 US states (16%). Above this entry.
- 60°F–65°F: 7 US states (14%). Above this entry.
- 65°F–70°F: 2 US states (4%). Above this entry.
- 70°F–75°F: 2 US states (4%). Above this entry.
Source NOAA U.S. Climate Normals (statewide aggregate) · 1991–2020
Illinois in the national rankings
- Ranks #25 coldest of 50 states at 52.2°F annual average, 0.9°F below the 53.1°F mean of all state averages - see all 50 coldest states ranked by NOAA normals
- In winter (Dec–Feb) it averages 29.0°F, the #18 coldest winter of 50 states - winter ranking
- 39.0% of NOAA hourly observations report clear sky (9 measured locations), the #33 clearest of 47 ranked states - sunniest states by clear-sky frequency
Temperature × precipitation · 50-state landscape
Illinois in the national climate landscape
Illinois averages 52.2°F and 40.7 inches of annual precipitation across 163 station-mapped locations. Against the same complete 50-state cohort, that places it in the cooler and drier half of the chart. Dashed lines mark the national medians of 52.3°F and 43.7 inches.
Read all 50 state values
Each point is PlainClimate's simple average across the station-mapped location normals available for that state. Cohort sizes vary and are shown below; the values are not population weighted. Dashed lines mark the median of this 50-state comparison and are guides, not comfort or safety thresholds.
| State | Locations | Annual mean | Annual precipitation |
|---|---|---|---|
| Alaska | 172 | 33.5°F | 47.6 in |
| Alabama | 100 | 63.3°F | 57.9 in |
| Arkansas | 110 | 60.7°F | 52.2 in |
| Arizona | 169 | 62.3°F | 12.4 in |
| California | 363 | 59.8°F | 21.6 in |
| Colorado | 214 | 46.3°F | 15.9 in |
| Connecticut | 23 | 50.1°F | 48.6 in |
| Delaware | 7 | 56.2°F | 46.8 in |
| Florida | 165 | 72.6°F | 55.2 in |
| Georgia | 122 | 63.4°F | 52.0 in |
| Hawaii | 49 | 72.4°F | 48.5 in |
| Iowa | 143 | 48.0°F | 35.9 in |
| Idaho | 139 | 46.1°F | 18.0 in |
| Illinois | 163 | 52.2°F | 40.7 in |
| Indiana | 116 | 52.4°F | 43.7 in |
| Kansas | 168 | 54.8°F | 31.2 in |
| Kentucky | 95 | 56.2°F | 50.6 in |
| Louisiana | 91 | 67.3°F | 60.3 in |
| Massachusetts | 68 | 49.2°F | 48.2 in |
| Maryland | 42 | 55.6°F | 45.5 in |
| Maine | 79 | 43.1°F | 46.4 in |
| Michigan | 201 | 45.5°F | 34.2 in |
| Minnesota | 172 | 42.2°F | 30.0 in |
| Missouri | 164 | 55.1°F | 43.9 in |
| Mississippi | 91 | 64.1°F | 59.7 in |
| Montana | 215 | 43.4°F | 15.9 in |
| North Carolina | 178 | 59.1°F | 52.2 in |
| North Dakota | 119 | 41.0°F | 19.2 in |
| Nebraska | 171 | 49.6°F | 25.0 in |
| New Hampshire | 52 | 44.5°F | 46.6 in |
| New Jersey | 45 | 53.6°F | 47.9 in |
| New Mexico | 167 | 54.3°F | 13.8 in |
| Nevada | 115 | 52.4°F | 8.9 in |
| New York | 173 | 47.5°F | 43.7 in |
| Ohio | 128 | 51.6°F | 41.1 in |
| Oklahoma | 159 | 60.3°F | 35.7 in |
| Oregon | 180 | 50.5°F | 37.6 in |
| Pennsylvania | 157 | 50.2°F | 45.2 in |
| Rhode Island | 9 | 51.2°F | 48.7 in |
| South Carolina | 100 | 62.8°F | 49.8 in |
| South Dakota | 149 | 45.6°F | 21.8 in |
| Tennessee | 146 | 58.0°F | 56.0 in |
| Texas | 449 | 66.2°F | 31.1 in |
| Utah | 170 | 49.4°F | 13.9 in |
| Virginia | 119 | 55.8°F | 46.0 in |
| Vermont | 41 | 43.5°F | 43.7 in |
| Washington | 149 | 49.9°F | 40.9 in |
| Wisconsin | 200 | 44.5°F | 34.6 in |
| West Virginia | 99 | 52.3°F | 47.6 in |
| Wyoming | 144 | 43.3°F | 14.0 in |
Derived by PlainClimate from NOAA 1991-2020 U.S. Climate Normals · simple averages across each state's varying station-mapped-location cohort · data updated August 2026.
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 station-mapped locations 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
Station-mapped locations in Illinois
163 locations with climate data
Scroll the table to browse every location, or use the complete CSV and JSON exports below.
| Location | Avg Temp | High | Low | Precip | Snow | Comfort |
|---|---|---|---|---|---|---|
| Albion | 57°F | 67°F | 47°F | N/A | N/A | N/A |
| Aledo | 50°F | 61°F | 40°F | 39.1" | 21.8" | 59/100 |
| Alton - Melvin Price L&d | 56°F | 65°F | 46°F | 41.9" | N/A | 80/100 |
| Altona | 49°F | 60°F | 38°F | 39.4" | N/A | 64/100 |
| Anna | 59°F | 70°F | 47°F | 51.1" | 10.4" | 68/100 |
| Antioch | 49°F | 57°F | 40°F | N/A | N/A | N/A |
| Athens | 52°F | 63°F | 42°F | 38.4" | N/A | 68/100 |
| Aurora | 50°F | 59°F | 41°F | 39.5" | 27.9" | 63/100 |
| Avon | 49°F | 60°F | 39°F | 37.6" | 24.0" | 59/100 |
| Barrington | 48°F | 57°F | 39°F | 40.4" | 38.5" | 59/100 |
| Belleville Siu Rsch | 58°F | 69°F | 46°F | 43.4" | 11.2" | 78/100 |
| Bentley | 53°F | 63°F | 43°F | 40.1" | 23.1" | 63/100 |
| Benton | 56°F | 66°F | 47°F | N/A | N/A | N/A |
| Bloomington | 50°F | 60°F | 40°F | 40.4" | N/A | 68/100 |
| Brookport Dam | 57°F | 68°F | 47°F | 49.1" | 3.1" | 83/100 |
| Brownstown | 55°F | 64°F | 45°F | 41.2" | N/A | 68/100 |
| Cahokia | 56°F | 67°F | 46°F | 42.8" | 13.8" | 78/100 |
| Cahokia St Louis | 57°F | 67°F | 46°F | 40.8" | N/A | 80/100 |
| Cairo | 58°F | 68°F | 48°F | 51.0" | N/A | 68/100 |
| Carbondale Sewage Plt | 56°F | 67°F | 45°F | 49.0" | 11.4" | 78/100 |
| Carbondale Southern IL | 56°F | 67°F | 46°F | 44.0" | N/A | 80/100 |
| Carlinville | 53°F | 64°F | 43°F | 40.0" | 16.5" | 68/100 |
| Carlyle Rsvr | 56°F | 66°F | 46°F | 45.9" | N/A | 80/100 |
| Carmi | 55°F | 67°F | 43°F | 48.3" | 11.7" | 78/100 |
| Casey | 54°F | 65°F | 43°F | 45.5" | 11.9" | 68/100 |
| Champaign | 51°F | 61°F | 41°F | 39.6" | N/A | 64/100 |
| Champaign Willard | 53°F | 63°F | 42°F | 37.0" | N/A | 68/100 |
| Channahon Dresden Isl Dam | 51°F | 61°F | 42°F | 37.2" | 18.4" | 68/100 |
| Charleston | 55°F | 66°F | 45°F | 43.8" | 19.0" | 78/100 |
| Chenoa | 51°F | 61°F | 40°F | 36.3" | 19.9" | 64/100 |
| Chicago | 51°F | 60°F | 43°F | 37.9" | 38.4" | 63/100 |
| Chicago Aurora Muni | 49°F | 60°F | 39°F | 33.8" | N/A | 64/100 |
| Chicago Botanic Garden | 50°F | 59°F | 40°F | 39.5" | 33.6" | 59/100 |
| Chicago Midway | 52°F | 60°F | 44°F | 34.4" | N/A | 68/100 |
| Chicago Northerly Island | 51°F | 57°F | 44°F | N/A | N/A | N/A |
| Chicago Palwaukee | 51°F | 59°F | 42°F | 32.3" | N/A | 68/100 |
| Chicago Waukegan Rgnl | 48°F | 57°F | 39°F | 35.3" | N/A | 64/100 |
| Compton | 48°F | 58°F | 38°F | N/A | N/A | N/A |
| Congerville | 52°F | 62°F | 42°F | 37.5" | 22.3" | 59/100 |
| Crystal Lake | 49°F | 59°F | 39°F | 39.4" | 35.1" | 59/100 |
| Danville | 53°F | 63°F | 43°F | 43.2" | N/A | 68/100 |
| De Kalb | 49°F | 58°F | 39°F | 37.3" | 33.1" | 59/100 |
| Decatur | 53°F | 63°F | 43°F | 36.4" | N/A | 68/100 |
| Decatur Wtp | 53°F | 62°F | 44°F | 40.4" | 13.6" | 68/100 |
| Dixon | 49°F | 59°F | 40°F | 40.5" | 31.2" | 63/100 |
| Dixon Springs Agric Ctr | 57°F | 68°F | 47°F | 50.5" | 7.2" | 68/100 |
| Du Quoin | 56°F | 66°F | 46°F | 47.7" | 11.9" | 78/100 |
| Dwight | 49°F | 60°F | 39°F | 37.7" | 23.3" | 59/100 |
| Effingham | 54°F | 65°F | 44°F | 44.0" | 14.6" | 68/100 |
| Elgin | 49°F | 59°F | 39°F | 39.9" | 32.1" | 59/100 |
| Elizabeth | 48°F | 58°F | 37°F | 39.4" | 30.2" | 59/100 |
| Fairfield Radio Wfiw | 57°F | 68°F | 47°F | 46.0" | N/A | 80/100 |
| Flora | 55°F | 66°F | 44°F | 48.0" | 11.6" | 78/100 |
| Freeport Waste Wtp | 48°F | 58°F | 38°F | 38.4" | 34.5" | 59/100 |
| Fulton L&d | 50°F | 59°F | 41°F | 34.3" | N/A | 68/100 |
| Galena | 47°F | 57°F | 37°F | 39.6" | 37.9" | 59/100 |
| Galesburg | 50°F | 60°F | 41°F | 39.0" | 25.9" | 63/100 |
| Galva | 50°F | 60°F | 39°F | 38.7" | N/A | 64/100 |
| Geneseo | 51°F | 61°F | 41°F | 39.1" | 28.4" | 63/100 |
| Gibson City | 51°F | 61°F | 41°F | 37.7" | 18.3" | 64/100 |
| Gladstone Dam | 52°F | 61°F | 43°F | 37.2" | 16.9" | 68/100 |
| Golden | 52°F | 63°F | 42°F | N/A | N/A | N/A |
| Grand Chain Dam | 58°F | 68°F | 48°F | 49.4" | 7.2" | 78/100 |
| Grayville | 56°F | 67°F | 46°F | 50.0" | 11.8" | 78/100 |
| Harrisburg | 57°F | 68°F | 47°F | 47.6" | N/A | 80/100 |
| Havana | 53°F | 63°F | 42°F | 41.0" | 27.9" | 63/100 |
| Hennepin | 51°F | 61°F | 42°F | 38.6" | N/A | 68/100 |
| Hennepin Wtr Trmt Plt | 51°F | 62°F | 40°F | N/A | N/A | N/A |
| Hillsboro | 56°F | 66°F | 45°F | 42.1" | N/A | 80/100 |
| Hoopeston | 52°F | 62°F | 43°F | 40.9" | 20.3" | 59/100 |
| Illinois City Dam | 50°F | 60°F | 41°F | 36.4" | N/A | 68/100 |
| Iuka | 55°F | 65°F | 44°F | 44.7" | 12.0" | 68/100 |
| Jacksonville | 53°F | 64°F | 42°F | 39.3" | 16.2" | 68/100 |
| Jerseyville | 53°F | 64°F | 43°F | 42.2" | 12.5" | 68/100 |
| Joliet Brandon RD Dam | 50°F | 60°F | 41°F | 38.0" | 16.9" | 68/100 |
| Kankakee Metro Wastewater | 51°F | 61°F | 41°F | 41.7" | 20.7" | 63/100 |
| Kaskaskia Rvr Navigation Lock | 56°F | 67°F | 46°F | 42.8" | 4.3" | 83/100 |
| Kewanee | 50°F | 60°F | 39°F | 39.6" | 30.8" | 59/100 |
| Knoxville | 50°F | 60°F | 41°F | 40.5" | 25.4" | 63/100 |
| La Harpe | 51°F | 61°F | 41°F | 39.1" | N/A | 68/100 |
| Lacon | 53°F | 63°F | 42°F | 38.4" | 24.6" | 59/100 |
| Lake Villa | 49°F | 58°F | 40°F | 37.8" | 43.4" | 63/100 |
| Lawrenceville | 56°F | 66°F | 46°F | 41.7" | N/A | 80/100 |
| Lincoln | 52°F | 63°F | 42°F | 39.8" | 19.3" | 64/100 |
| Lisle-morton Arboretum | 49°F | 60°F | 39°F | 40.2" | N/A | 64/100 |
| Little Red School Hse | 51°F | 62°F | 41°F | 41.4" | N/A | 68/100 |
| Marengo | 48°F | 58°F | 38°F | 37.6" | 30.8" | 59/100 |
| Marseilles Lock | 50°F | 60°F | 39°F | 39.0" | 25.0" | 59/100 |
| Mason City | 52°F | 62°F | 41°F | 39.3" | 12.9" | 68/100 |
| Mattoon | 54°F | 63°F | 44°F | 41.3" | 14.5" | 68/100 |
| Mattoon Coles County | 53°F | 63°F | 44°F | 36.0" | N/A | 68/100 |
| McHenry -wg Stratton L&d | 49°F | 59°F | 38°F | 37.0" | 34.5" | 59/100 |
| Mcleansboro | 55°F | 67°F | 44°F | 47.1" | 13.3" | 78/100 |
| Minonk | 51°F | 62°F | 41°F | 37.6" | 21.7" | 59/100 |
| Moline Quad City | 51°F | 62°F | 41°F | 38.3" | 36.1" | 59/100 |
| Monmouth | 51°F | 61°F | 41°F | 39.4" | 25.6" | 59/100 |
| Morris | 51°F | 60°F | 41°F | 38.8" | 24.7" | 63/100 |
| Morrison | 48°F | 59°F | 38°F | 38.3" | 31.5" | 59/100 |
| Morrisonville | 54°F | 64°F | 43°F | 38.1" | 16.2" | 68/100 |
| Mt Carmel | 56°F | 66°F | 47°F | 48.7" | 8.9" | 78/100 |
| Mt Carroll | 49°F | 60°F | 37°F | 40.3" | 33.4" | 59/100 |
| Mt Vernon | 55°F | 64°F | 45°F | 45.0" | 10.4" | 68/100 |
| Mundelein | 48°F | 57°F | 39°F | 38.5" | 43.1" | 59/100 |
| Nashville | 55°F | 65°F | 45°F | 42.2" | 11.7" | 78/100 |
| Neoga | 54°F | 65°F | 43°F | 41.9" | N/A | 68/100 |
| New Boston Dam | 51°F | 61°F | 42°F | 36.3" | N/A | 68/100 |
| Newton | 55°F | 64°F | 45°F | 46.0" | 16.0" | 68/100 |
| Normal | 51°F | 62°F | 40°F | 39.4" | 20.1" | 59/100 |
| Ogden | 52°F | 62°F | 43°F | 41.2" | 25.0" | 63/100 |
| Olney | 54°F | 65°F | 44°F | 48.8" | 10.5" | 68/100 |
| Ottawa | 50°F | 60°F | 41°F | 36.2" | 23.7" | 63/100 |
| Palestine | 55°F | 65°F | 45°F | 46.3" | 11.6" | 78/100 |
| Pana | 54°F | 65°F | 43°F | 42.3" | 14.5" | 68/100 |
| Paris Stp | 51°F | 62°F | 41°F | 42.7" | 19.1" | 68/100 |
| Park Forest | 50°F | 59°F | 40°F | 42.1" | 28.2" | 59/100 |
| Paw Paw | 48°F | 58°F | 38°F | 36.8" | 30.1" | 59/100 |
| Paxton | 51°F | 61°F | 40°F | 37.9" | 18.3" | 64/100 |
| Peoria Gtr Peoria | 53°F | 62°F | 43°F | 37.5" | 26.2" | 63/100 |
| Perry | 53°F | 64°F | 42°F | 39.1" | 20.9" | 59/100 |
| Peru | 50°F | 60°F | 39°F | 38.0" | 28.5" | 59/100 |
| Petersburg | 52°F | 63°F | 42°F | 37.6" | 15.2" | 68/100 |
| Piper City | 52°F | 64°F | 40°F | 44.4" | 24.7" | 59/100 |
| Pittsfield | 54°F | 65°F | 43°F | 40.5" | 15.6" | 68/100 |
| Polo | 49°F | 60°F | 39°F | 40.0" | N/A | 64/100 |
| Pontiac | 52°F | 61°F | 42°F | 37.0" | 25.1" | 63/100 |
| Prairie City | 52°F | 62°F | 41°F | 38.5" | 21.3" | 63/100 |
| Princeton | 50°F | 60°F | 40°F | 39.8" | 28.5" | 59/100 |
| Princeville | 51°F | 62°F | 40°F | 38.8" | 20.3" | 59/100 |
| Quincy | 53°F | 63°F | 44°F | 36.4" | N/A | 68/100 |
| Quincy Dam | 54°F | 63°F | 44°F | 36.5" | N/A | 68/100 |
| Ramsey | 53°F | 63°F | 42°F | 42.5" | 12.8" | 68/100 |
| Rantoul | 52°F | 64°F | 41°F | 40.4" | N/A | 64/100 |
| Rend Lake Dam | 56°F | 66°F | 46°F | 46.0" | N/A | 80/100 |
| Robinson | 54°F | 65°F | 44°F | 45.5" | N/A | 68/100 |
| Rochelle | 48°F | 58°F | 38°F | 36.6" | N/A | 64/100 |
| Rock Island L&d | 50°F | 60°F | 41°F | 38.8" | N/A | 68/100 |
| Rockford Gtr Rockford | 49°F | 59°F | 40°F | 37.2" | 37.1" | 59/100 |
| Romeoville | 51°F | 60°F | 41°F | 41.1" | 33.2" | 63/100 |
| Rosiclare | 55°F | 66°F | 44°F | 50.9" | 3.3" | 63/100 |
| Rushville | 52°F | 61°F | 42°F | 40.9" | N/A | 68/100 |
| Salem | 55°F | 65°F | 45°F | 45.9" | 10.2" | 68/100 |
| Shabbona | 48°F | 58°F | 38°F | 37.4" | N/A | 64/100 |
| Shelbyville Dam | 54°F | 63°F | 44°F | 41.4" | N/A | 68/100 |
| Sidell | 52°F | 61°F | 42°F | 40.4" | 23.7" | 63/100 |
| Smithland L&d | 57°F | 67°F | 47°F | 49.3" | 3.8" | 83/100 |
| Sparta | 55°F | 66°F | 44°F | 45.6" | 10.6" | 78/100 |
| Springfield | 53°F | 63°F | 43°F | 40.5" | N/A | 68/100 |
| Springfield Capital | 54°F | 64°F | 44°F | 38.0" | 21.8" | 63/100 |
| Stockton | 48°F | 58°F | 38°F | 38.7" | 35.7" | 59/100 |
| Streamwood | 50°F | 61°F | 38°F | 38.0" | 34.0" | 59/100 |
| Streator | 52°F | 62°F | 42°F | 39.4" | 26.4" | 63/100 |
| Sullivan | 53°F | 63°F | 43°F | 41.6" | 12.9" | 68/100 |
| Tuscola | 52°F | 62°F | 43°F | 40.5" | 16.9" | 68/100 |
| Vandalia | 54°F | 64°F | 44°F | 43.7" | N/A | 68/100 |
| Virden | 55°F | 64°F | 46°F | 38.4" | 16.1" | 68/100 |
| Walnut | 49°F | 59°F | 40°F | 36.8" | 35.9" | 59/100 |
| Watseka | 51°F | 62°F | 40°F | 38.4" | 17.1" | 64/100 |
| Waukegan | 48°F | 57°F | 40°F | N/A | N/A | N/A |
| West Chicago Dupage | 50°F | 59°F | 40°F | 33.2" | N/A | 64/100 |
| Wheaton | 51°F | 62°F | 41°F | 39.9" | 24.3" | 59/100 |
| White Hall | 53°F | 63°F | 43°F | 39.6" | 18.2" | 68/100 |
| Winchester | 53°F | 64°F | 42°F | 40.4" | N/A | 68/100 |
| Windsor | 53°F | 62°F | 43°F | 41.2" | 13.7" | 68/100 |
Source: NOAA National Centers for Environmental Information U.S. Climate Normals v1.0.1 · 1991-2020 Statewide aggregates for Illinois computed as the simple average across its 163 station-mapped locations, each represented by its primary NOAA station (453 stations in the state network).
Climate Insight: Illinois
Illinois's climate profile is aggregated from 163 station-mapped locations 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 is the simple average across all tracked station-mapped locations rather than any single station'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 21.3 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 163 individual location profiles below; each station record varies with local geography, and the statewide figures here are averages that mask meaningful intrastate differences.
For planning purposes, the location 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 climate comfort score. That 1–100 score combines temperature mildness, precipitation moderation, snowfall burden, and frost-free growing-season length from each location's NOAA normal. It is a climate-only comparison, not a NOAA or overall livability rating. Use it as a starting point, then open each location profile for the exact score inputs, monthly breakdowns, degree-day totals, frost dates, and separately reported humidity metrics.
Nationwide similar states
Other states closest to Illinois on two NOAA statewide-average axes (annual temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest 50-state peers by avg_temp (52°F here).
- West Virginia 52°F · 0.1°F off
- Indiana 52°F · 0.2°F off
- Nevada 52°F · 0.2°F off
- Ohio 52°F · 0.6°F off
Closest by annual precipitation
Nearest peers by avg_precip (40.7" here), excluding temperature-peer codes.
- Washington 40.9" · 0.2" off
- New York 43.7" · 3.0" off
- Vermont 43.7" · 3.0" off
- Oregon 37.6" · 3.1" off
Frequently Asked Questions
What is the average temperature in Illinois? ▼
Does the climate vary a lot within Illinois? ▼
Where does Illinois rank nationally for temperature? ▼
What is the most comfortable station-mapped location in Illinois? ▼
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.
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.