NOAA's National Centers for Environmental Information
Statewide Rankings
Illinois
December 2020 Average Temperature Rankings
| Period | Value | 1901-2000 Mean | Anomaly | Rank (1895-2025) | Coolest/Warmest Since | Record |
|---|---|---|---|---|---|---|
| December 2020 1-Month | 33.0°F (0.6°C) | 29.4°F (-1.4°C) | 3.6°F | 93rd Coolest | Coolest since: | 1983 |
| 38th Warmest | Warmest since: | 2015 | ||||
| Nov– 2-Month | 40.1°F (4.5°C) | 35.1°F (1.7°C) | 5.0°F | 117th Coolest | Coolest since: | 1950 |
| 14th Warmest | Warmest since: | 2015 | ||||
| Oct– 3-Month | 44.0°F (6.7°C) | 41.6°F (5.3°C) | 2.4°F | 105th Coolest | Coolest since: | 1976 |
| 26th Warmest | Warmest since: | 1931 | ||||
| Ties: 1938, 2004 | ||||||
| Sep– 4-Month | 49.4°F (9.7°C) | 47.8°F (8.8°C) | 1.6°F | 99th Coolest | Coolest since: | 1976 |
| 32nd Warmest | Warmest since: | 1931 | ||||
| Ties: 1920, 1921, 1947, 1954 | ||||||
| Aug– 5-Month | 54.1°F (12.3°C) | 52.9°F (11.6°C) | 1.2°F | 98th Coolest | Coolest since: | 1976 |
| 33rd Warmest | Warmest since: | 1931 | ||||
| Ties: 1899, 1921, 1933, 1940, 1975, 1990 | ||||||
| Jul– 6-Month | 58.0°F (14.4°C) | 56.7°F (13.7°C) | 1.3°F | 105th Coolest | Coolest since: | 1976 |
| 26th Warmest | Warmest since: | 1931 | ||||
| Ties: 1922, 1956, 1973, 1994 | ||||||
| Jun– 7-Month | 60.2°F (15.7°C) | 58.8°F (14.9°C) | 1.4°F | 104th Coolest | Coolest since: | 1917 |
| 27th Warmest | Warmest since: | 1931 | ||||
| Ties: 1956, 1984, 1987 | ||||||
| May– 8-Month | 60.3°F (15.7°C) | 59.2°F (15.1°C) | 1.1°F | 96th Coolest | Coolest since: | 1917 |
| 35th Warmest | Warmest since: | 1931 | ||||
| Ties: 1918, 1975, 1994 | ||||||
| Apr– 9-Month | 59.1°F (15.1°C) | 58.3°F (14.6°C) | 0.8°F | 82nd Coolest | Coolest since: | 1917 |
| 49th Warmest | Warmest since: | 1931 | ||||
| Ties: 1946, 1948, 1964 | ||||||
| Mar– 10-Month | 57.6°F (14.2°C) | 56.5°F (13.6°C) | 1.1°F | 96th Coolest | Coolest since: | 1917 |
| 35th Warmest | Warmest since: | 2012 | ||||
| Ties: 1971, 1988, 2004 | ||||||
| Feb– 11-Month | 55.3°F (12.9°C) | 54.0°F (12.2°C) | 1.3°F | 105th Coolest | Coolest since: | 1917 |
| 26th Warmest | Warmest since: | 2024 | ||||
| Ties: 1977, 2015 | ||||||
| Jan– 12-Month | 53.3°F (11.8°C) | 51.6°F (10.9°C) | 1.7°F | 107th Coolest | Coolest since: | 1917 |
| 24th Warmest | Warmest since: | 2012 | ||||
| Ties: 1939 | ||||||
| Jul 2019– 18-Month | 54.8°F (12.7°C) | 53.3°F (11.8°C) | 1.5°F | 110th Coolest | Coolest since: | 1904 |
| 20th Warmest | Warmest since: | 2012 | ||||
| Jan 2019– 24-Month | 52.7°F (11.5°C) | 51.6°F (10.9°C) | 1.1°F | 97th Coolest | Coolest since: | 1904, 1979 |
| 33rd Warmest | Warmest since: | 2024 | ||||
| Jan 2018– 36-Month | 52.6°F (11.4°C) | 51.6°F (10.9°C) | 1.0°F | 99th Coolest | Coolest since: | 1905 |
| 30th Warmest | Warmest since: | 2024 | ||||
| Ties: 1921, 1939, 1940, 1991 | ||||||
| Jan 2017– 48-Month | 53.1°F (11.7°C) | 51.6°F (10.9°C) | 1.5°F | 117th Coolest | Coolest since: | 1905 |
| 11th Warmest | Warmest since: | 2024 | ||||
| Ties: 1955, 1956, 2002, 2008 | ||||||
| Jan 2016– 60-Month | 53.4°F (11.9°C) | 51.6°F (10.9°C) | 1.8°F | 124th Coolest | Coolest since: | 1905 |
| 3rd Warmest | Warmest since: | 2024 | ||||
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2025, retrieved on March 26, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings
