Counties with the coldest winters in Illinois
#25. Ford County (tie)
- Winter 2024 average temperature: 33.9 degrees Fahrenheit
- Historic average summer temperature: 26.2 degrees
-- 2024 difference from historic average: +7.7 degrees
- Historic average summer temperature: 26.2 degrees
-- 2024 difference from historic average: +7.7 degrees
#25. Grundy County (tie)
- Winter 2024 average temperature: 33.9 degrees Fahrenheit
- Historic average summer temperature: 24.8 degrees
-- 2024 difference from historic average: +9.1 degrees
- Historic average summer temperature: 24.8 degrees
-- 2024 difference from historic average: +9.1 degrees
#25. Kankakee County (tie)
- Winter 2024 average temperature: 33.9 degrees Fahrenheit
- Historic average summer temperature: 25.6 degrees
-- 2024 difference from historic average: +8.4 degrees
- Historic average summer temperature: 25.6 degrees
-- 2024 difference from historic average: +8.4 degrees
#25. Stark County (tie)
- Winter 2024 average temperature: 33.9 degrees Fahrenheit
- Historic average summer temperature: 24.6 degrees
-- 2024 difference from historic average: +9.3 degrees
- Historic average summer temperature: 24.6 degrees
-- 2024 difference from historic average: +9.3 degrees
#25. Will County (tie)
- Winter 2024 average temperature: 33.9 degrees Fahrenheit
- Historic average summer temperature: 25.2 degrees
-- 2024 difference from historic average: +8.7 degrees
- Historic average summer temperature: 25.2 degrees
-- 2024 difference from historic average: +8.7 degrees
#22. Henderson County (tie)
- Winter 2024 average temperature: 33.8 degrees Fahrenheit
- Historic average summer temperature: 25.8 degrees
-- 2024 difference from historic average: +8 degrees
- Historic average summer temperature: 25.8 degrees
-- 2024 difference from historic average: +8 degrees
#22. Iroquois County (tie)
- Winter 2024 average temperature: 33.8 degrees Fahrenheit
- Historic average summer temperature: 26.2 degrees
-- 2024 difference from historic average: +7.7 degrees
- Historic average summer temperature: 26.2 degrees
-- 2024 difference from historic average: +7.7 degrees
#22. Putnam County (tie)
- Winter 2024 average temperature: 33.8 degrees Fahrenheit
- Historic average summer temperature: 25.0 degrees
-- 2024 difference from historic average: +8.8 degrees
- Historic average summer temperature: 25.0 degrees
-- 2024 difference from historic average: +8.8 degrees
#21. DuPage County
- Winter 2024 average temperature: 33.7 degrees Fahrenheit
- Historic average summer temperature: 24.3 degrees
-- 2024 difference from historic average: +9.4 degrees
- Historic average summer temperature: 24.3 degrees
-- 2024 difference from historic average: +9.4 degrees
#20. Knox County
- Winter 2024 average temperature: 33.5 degrees Fahrenheit
- Historic average summer temperature: 25.1 degrees
-- 2024 difference from historic average: +8.4 degrees
- Historic average summer temperature: 25.1 degrees
-- 2024 difference from historic average: +8.4 degrees
#18. Kendall County (tie)
- Winter 2024 average temperature: 33.4 degrees Fahrenheit
- Historic average summer temperature: 24.4 degrees
-- 2024 difference from historic average: +9 degrees
- Historic average summer temperature: 24.4 degrees
-- 2024 difference from historic average: +9 degrees
#18. Lake County (tie)
- Winter 2024 average temperature: 33.4 degrees Fahrenheit
- Historic average summer temperature: 23.6 degrees
-- 2024 difference from historic average: +9.8 degrees
- Historic average summer temperature: 23.6 degrees
-- 2024 difference from historic average: +9.8 degrees
#16. Mercer County (tie)
- Winter 2024 average temperature: 33.3 degrees Fahrenheit
- Historic average summer temperature: 24.6 degrees
-- 2024 difference from historic average: +8.6 degrees
- Historic average summer temperature: 24.6 degrees
-- 2024 difference from historic average: +8.6 degrees
#16. Warren County (tie)
- Winter 2024 average temperature: 33.3 degrees Fahrenheit
- Historic average summer temperature: 25.3 degrees
-- 2024 difference from historic average: +8 degrees
- Historic average summer temperature: 25.3 degrees
-- 2024 difference from historic average: +8 degrees
#15. LaSalle County
- Winter 2024 average temperature: 33.2 degrees Fahrenheit
- Historic average summer temperature: 24.4 degrees
-- 2024 difference from historic average: +8.8 degrees
- Historic average summer temperature: 24.4 degrees
-- 2024 difference from historic average: +8.8 degrees
#13. Bureau County (tie)
- Winter 2024 average temperature: 33.1 degrees Fahrenheit
- Historic average summer temperature: 23.9 degrees
-- 2024 difference from historic average: +9.2 degrees
- Historic average summer temperature: 23.9 degrees
-- 2024 difference from historic average: +9.2 degrees
#13. Rock Island County (tie)
- Winter 2024 average temperature: 33.1 degrees Fahrenheit
- Historic average summer temperature: 24.1 degrees
-- 2024 difference from historic average: +9 degrees
- Historic average summer temperature: 24.1 degrees
-- 2024 difference from historic average: +9 degrees
#12. Henry County
- Winter 2024 average temperature: 33.0 degrees Fahrenheit
- Historic average summer temperature: 24.0 degrees
-- 2024 difference from historic average: +9 degrees
- Historic average summer temperature: 24.0 degrees
-- 2024 difference from historic average: +9 degrees
#10. Kane County (tie)
- Winter 2024 average temperature: 32.7 degrees Fahrenheit
- Historic average summer temperature: 23.4 degrees
-- 2024 difference from historic average: +9.3 degrees
- Historic average summer temperature: 23.4 degrees
-- 2024 difference from historic average: +9.3 degrees
#10. Whiteside County (tie)
- Winter 2024 average temperature: 32.7 degrees Fahrenheit
- Historic average summer temperature: 23.1 degrees
-- 2024 difference from historic average: +9.6 degrees
- Historic average summer temperature: 23.1 degrees
-- 2024 difference from historic average: +9.6 degrees
#9. Lee County
- Winter 2024 average temperature: 32.3 degrees Fahrenheit
- Historic average summer temperature: 22.8 degrees
-- 2024 difference from historic average: +9.5 degrees
- Historic average summer temperature: 22.8 degrees
-- 2024 difference from historic average: +9.5 degrees
#8. DeKalb County
- Winter 2024 average temperature: 32.1 degrees Fahrenheit
- Historic average summer temperature: 22.9 degrees
-- 2024 difference from historic average: +9.2 degrees
- Historic average summer temperature: 22.9 degrees
-- 2024 difference from historic average: +9.2 degrees
#6. Ogle County (tie)
- Winter 2024 average temperature: 31.8 degrees Fahrenheit
- Historic average summer temperature: 22.2 degrees
-- 2024 difference from historic average: +9.6 degrees
- Historic average summer temperature: 22.2 degrees
-- 2024 difference from historic average: +9.6 degrees
#6. Winnebago County (tie)
- Winter 2024 average temperature: 31.8 degrees Fahrenheit
- Historic average summer temperature: 22.0 degrees
-- 2024 difference from historic average: +9.8 degrees
- Historic average summer temperature: 22.0 degrees
-- 2024 difference from historic average: +9.8 degrees
#3. Boone County (tie)
- Winter 2024 average temperature: 31.6 degrees Fahrenheit
- Historic average summer temperature: 22.1 degrees
-- 2024 difference from historic average: +9.5 degrees
- Historic average summer temperature: 22.1 degrees
-- 2024 difference from historic average: +9.5 degrees
#3. Carroll County (tie)
- Winter 2024 average temperature: 31.6 degrees Fahrenheit
- Historic average summer temperature: 21.9 degrees
-- 2024 difference from historic average: +9.7 degrees
- Historic average summer temperature: 21.9 degrees
-- 2024 difference from historic average: +9.7 degrees
#3. McHenry County (tie)
- Winter 2024 average temperature: 31.6 degrees Fahrenheit
- Historic average summer temperature: 22.3 degrees
-- 2024 difference from historic average: +9.4 degrees
- Historic average summer temperature: 22.3 degrees
-- 2024 difference from historic average: +9.4 degrees
#2. Stephenson County
- Winter 2024 average temperature: 31.1 degrees Fahrenheit
- Historic average summer temperature: 21.2 degrees
-- 2024 difference from historic average: +9.8 degrees
- Historic average summer temperature: 21.2 degrees
-- 2024 difference from historic average: +9.8 degrees
#1. Jo Daviess County
- Winter 2024 average temperature: 30.9 degrees Fahrenheit
- Historic average summer temperature: 21.3 degrees
-- 2024 difference from historic average: +9.6 degrees
- Historic average summer temperature: 21.3 degrees
-- 2024 difference from historic average: +9.6 degrees
This story features data reporting by Wade Zhou, writing by Andrea Vale, and is part of a series utilizing data automation across 48 states.
Leszek Glasner // Shutterstock