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In 2022, the continental United States experienced its , according to data from the National Oceanic and Atmospheric Administration, while 20 states saw one of their in the same month. The year prior, July marked the .

Climate change is driving rising temperatures and more record heat. The has climbed each decade since 1880 by about .14 degrees Fahrenheit, or roughly 2 degrees Fahrenheit total.

compiled a ranking of the hottest Januarys in Illinois since 1895 using data from the . Rankings are based on the highest average temperature in each month. For each of the hottest months listed below, we've included the average state temperature, state-wide highs and lows for the month, and the total precipitation.

#10. January 1921
- Average temperature: 32.4°F
- Monthly high temperature: 39.9°F
- Monthly low temperature: 24.8°F
- Total precipitation: 1.57"

#9. January 1914
- Average temperature: 32.6°F
- Monthly high temperature: 40.1°F
- Monthly low temperature: 25°F
- Total precipitation: 1.88"

#8. January 1939
- Average temperature: 32.7°F
- Monthly high temperature: 40.5°F
- Monthly low temperature: 24.8°F
- Total precipitation: 3.04"

#7. January 2002
- Average temperature: 33.6°F
- Monthly high temperature: 42.6°F
- Monthly low temperature: 24.6°F
- Total precipitation: 2.22"

#6. January 1932
- Average temperature: 33.9°F
- Monthly high temperature: 41.1°F
- Monthly low temperature: 26.8°F
- Total precipitation: 2.96"

#5. January 2023
- Average temperature: 34.4°F
- Monthly high temperature: 41.1°F
- Monthly low temperature: 27.7°F
- Total precipitation: 2.62"

#4. January 1989
- Average temperature: 34.8°F
- Monthly high temperature: 43.3°F
- Monthly low temperature: 26.3°F
- Total precipitation: 1.58"

#3. January 1990
- Average temperature: 36.4°F
- Monthly high temperature: 45.5°F
- Monthly low temperature: 27.2°F
- Total precipitation: 2.05"

#2. January 1933
- Average temperature: 36.9°F
- Monthly high temperature: 46.1°F
- Monthly low temperature: 27.7°F
- Total precipitation: 2.56"

#1. January 2006
- Average temperature: 38.1°F
- Monthly high temperature: 45.6°F
- Monthly low temperature: 30.6°F
- Total precipitation: 2.74"