NOAA's National Centers for Environmental Information
Statewide Rankings
Illinois
January 2021 Average Temperature Rankings
| Period | Value | 1901-2000 Mean | Anomaly | Rank (1895-2025) | Coolest/Warmest Since | Record |
|---|---|---|---|---|---|---|
| January 2021 1-Month | 29.5°F (-1.4°C) | 25.3°F (-3.7°C) | 4.2°F | 101st Coolest | Coolest since: | 1977 |
| 31st Warmest | Warmest since: | 2006 | ||||
| Ties: 1898 | ||||||
| Dec 2020– 2-Month | 31.3°F (-0.4°C) | 27.5°F (-2.5°C) | 3.8°F | 105th Coolest | Coolest since: | 1918 |
| 26th Warmest | Warmest since: | 1932 | ||||
| Nov 2020– 3-Month | 36.5°F (2.5°C) | 31.9°F (-0.1°C) | 4.6°F | 124th Coolest | Coolest since: | 1977 |
| 7th Warmest | Warmest since: | 1932 | ||||
| Oct 2020– 4-Month | 40.4°F (4.7°C) | 37.6°F (3.1°C) | 2.8°F | 109th Coolest | Coolest since: | 1977 |
| 22nd Warmest | Warmest since: | 1932 | ||||
| Ties: 1921 | ||||||
| Sep 2020– 5-Month | 45.4°F (7.4°C) | 43.3°F (6.3°C) | 2.1°F | 103rd Coolest | Coolest since: | 1977 |
| 28th Warmest | Warmest since: | 1932 | ||||
| Aug 2020– 6-Month | 50.0°F (10.0°C) | 48.4°F (9.1°C) | 1.6°F | 103rd Coolest | Coolest since: | 1977 |
| 28th Warmest | Warmest since: | 1932 | ||||
| Ties: 1950, 1995, 2000, 2007 | ||||||
| Jul 2020– 7-Month | 53.9°F (12.2°C) | 52.2°F (11.2°C) | 1.7°F | 106th Coolest | Coolest since: | 1977 |
| 25th Warmest | Warmest since: | 1932 | ||||
| Jun 2020– 8-Month | 56.4°F (13.6°C) | 54.6°F (12.6°C) | 1.8°F | 106th Coolest | Coolest since: | 1918, 1977 |
| 25th Warmest | Warmest since: | 1932 | ||||
| May 2020– 9-Month | 56.8°F (13.8°C) | 55.5°F (13.1°C) | 1.3°F | 99th Coolest | Coolest since: | 1918 |
| 32nd Warmest | Warmest since: | 1932 | ||||
| Ties: 1900, 1931, 1955, 1972 | ||||||
| Apr 2020– 10-Month | 56.1°F (13.4°C) | 55.1°F (12.8°C) | 1.0°F | 93rd Coolest | Coolest since: | 1918 |
| 38th Warmest | Warmest since: | 1932 | ||||
| Ties: 1960, 1987 | ||||||
| Mar 2020– 11-Month | 55.0°F (12.8°C) | 53.7°F (12.1°C) | 1.3°F | 100th Coolest | Coolest since: | 1918 |
| 31st Warmest | Warmest since: | 2013 | ||||
| Ties: 1919, 1931, 1955, 2005 | ||||||
| Feb 2020– 12-Month | 53.1°F (11.7°C) | 51.6°F (10.9°C) | 1.5°F | 105th Coolest | Coolest since: | 1918 |
| 26th Warmest | Warmest since: | 2013 | ||||
| Aug 2019– 18-Month | 52.2°F (11.2°C) | 50.5°F (10.3°C) | 1.7°F | 114th Coolest | Coolest since: | 1905, 1918 |
| 16th Warmest | Warmest since: | 2017 | ||||
| Ties: 1939, 2003, 2008 | ||||||
| Feb 2019– 24-Month | 52.9°F (11.6°C) | 51.6°F (10.9°C) | 1.3°F | 100th Coolest | Coolest since: | 1918 |
| 30th Warmest | Warmest since: | 2013 | ||||
| Ties: 2001, 2014 | ||||||
| Feb 2018– 36-Month | 52.8°F (11.6°C) | 51.6°F (10.9°C) | 1.2°F | 106th Coolest | Coolest since: | 1905 |
| 23rd Warmest | Warmest since: | 2013 | ||||
| Ties: 1932, 1935, 1993, 2003, 2012 | ||||||
| Feb 2017– 48-Month | 53.0°F (11.7°C) | 51.6°F (10.9°C) | 1.4°F | 115th Coolest | Coolest since: | 1905 |
| 13th Warmest | Warmest since: | 2025 | ||||
| Feb 2016– 60-Month | 53.4°F (11.9°C) | 51.6°F (10.9°C) | 1.8°F | 125th Coolest | Coolest since: | 1906 |
| 2nd Warmest | Warmest since: | 2025 | ||||
| Ties: 1935, 2003, 2020 | ||||||
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2025, retrieved on March 23, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings
