NOAA's National Centers for Environmental Information
Statewide Rankings
Illinois
February 1999 Average Temperature Rankings
| Period | Value | 1901-2000 Mean | Anomaly | Rank (1895-2025) | Coolest/Warmest Since | Record |
|---|---|---|---|---|---|---|
| February 1999 1-Month | 37.4°F (3.0°C) | 29.2°F (-1.6°C) | 8.2°F | 125th Coolest | Coolest since: | 1978 |
| 7th Warmest | Warmest since: | 2017 | ||||
| Jan– 2-Month | 31.3°F (-0.4°C) | 27.3°F (-2.6°C) | 4°F | 109th Coolest | Coolest since: | 1979 |
| 23rd Warmest | Warmest since: | 2017 | ||||
| Dec 1998– 3-Month | 32.5°F (0.3°C) | 28°F (-2.2°C) | 4.5°F | 116th Coolest | Coolest since: | 1978 |
| 15th Warmest | Warmest since: | 1932 | ||||
| Ties: 1931 | ||||||
| Nov 1998– 4-Month | 35.8°F (2.1°C) | 31.2°F (-0.4°C) | 4.6°F | 122nd Coolest | Coolest since: | 1977 |
| 9th Warmest | Warmest since: | 1932 | ||||
| Ties: 1983 | ||||||
| Oct 1998– 5-Month | 40°F (4.4°C) | 35.9°F (2.2°C) | 4.1°F | 124th Coolest | Coolest since: | 1977 |
| 7th Warmest | Warmest since: | 1932 | ||||
| Sep 1998– 6-Month | 45.1°F (7.3°C) | 41°F (5.0°C) | 4.1°F | 125th Coolest | Coolest since: | 1977 |
| 6th Warmest | Warmest since: | 1932 | ||||
| Aug 1998– 7-Month | 49.4°F (9.7°C) | 45.6°F (7.6°C) | 3.8°F | 125th Coolest | Coolest since: | 1977 |
| 6th Warmest | Warmest since: | 1932 | ||||
| Jul 1998– 8-Month | 52.6°F (11.4°C) | 49.4°F (9.7°C) | 3.2°F | 125th Coolest | Coolest since: | 1977 |
| 6th Warmest | Warmest since: | 1932 | ||||
| Jun 1998– 9-Month | 54.7°F (12.6°C) | 51.8°F (11.0°C) | 2.9°F | 124th Coolest | Coolest since: | 1977 |
| 7th Warmest | Warmest since: | 1932 | ||||
| May 1998– 10-Month | 56°F (13.3°C) | 52.8°F (11.6°C) | 3.2°F | 128th Coolest | Coolest since: | 1918 |
| 3rd Warmest | Warmest since: | 1932 | ||||
| Apr 1998– 11-Month | 55.7°F (13.2°C) | 52.7°F (11.5°C) | 3°F | 127th Coolest | Coolest since: | 1918 |
| 4th Warmest | Warmest since: | 1932 | ||||
| Mar 1998– 12-Month | 54.4°F (12.4°C) | 51.6°F (10.9°C) | 2.8°F | 125th Coolest | Coolest since: | 1918 |
| 6th Warmest | Warmest since: | 2017 | ||||
| Sep 1997– 18-Month | 50.9°F (10.5°C) | 48.1°F (8.9°C) | 2.8°F | 124th Coolest | Coolest since: | 1905 |
| 6th Warmest | Warmest since: | 2017 | ||||
| Mar 1997– 24-Month | 53.4°F (11.9°C) | 51.6°F (10.9°C) | 1.8°F | 117th Coolest | Coolest since: | 1905 |
| 13th Warmest | Warmest since: | 2017 | ||||
| Ties: 1955 | ||||||
| Mar 1996– 36-Month | 52.3°F (11.3°C) | 51.6°F (10.9°C) | 0.7°F | 88th Coolest | Coolest since: | 1979 |
| 41st Warmest | Warmest since: | 2013, 2018 | ||||
| Ties: 1940, 1943, 1944, 1976, 1991 | ||||||
| Mar 1995– 48-Month | 52.1°F (11.2°C) | 51.6°F (10.9°C) | 0.5°F | 80th Coolest | Coolest since: | 1905 |
| 48th Warmest | Warmest since: | 2025 | ||||
| Mar 1994– 60-Month | 52.2°F (11.2°C) | 51.6°F (10.9°C) | 0.6°F | 82nd Coolest | Coolest since: | 1905 |
| 45th Warmest | Warmest since: | 2025 | ||||
| Ties: 1933, 1950 | ||||||
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published September 2025, retrieved on September 18, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings
