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Warmest Cities in Illinois
Top 100 cities ranked by warmest cities
Best Illinois Cities
Composite rankings combining multiple weighted metrics — 4 topics from climate and air quality data.
Warmest Cities — Illinois
The warmest cities in Illinois enjoy high average annual temperatures, making them attractive to those who prefer mild winters and plenty of sunshine. Glen Carbon leads with an average annual temperature of 58°F.
Warm-climate cities are popular destinations for retirees, winter migrants, and outdoor enthusiasts. They typically offer year-round access to outdoor activities, lower heating costs, and longer growing seasons. Many have seen significant population growth in recent decades.
While warm weather is appealing, these cities may also face challenges including extreme summer heat, higher cooling costs, water scarcity, and vulnerability to hurricanes or other weather events. Many are investing in heat mitigation strategies and sustainable water management.
Did You Know?
- 1. Glen Carbon's average temperature of 58°F means residents enjoy warm weather virtually year-round.
- 2. The warmest U.S. cities are concentrated in southern Florida, Hawaii, and the desert Southwest.
- 3. Warm-climate cities have seen the fastest population growth in the U.S. over the past two decades, driven by retirees and remote workers.