Counties with the coldest winters in California
#25. Mendocino County
- Winter 2024 average temperature: 47.4 degrees Fahrenheit
- Historic average summer temperature: 44.7 degrees
-- 2024 difference from historic average: +2.7 degrees
- Historic average summer temperature: 44.7 degrees
-- 2024 difference from historic average: +2.7 degrees
#24. Calaveras County
- Winter 2024 average temperature: 46.5 degrees Fahrenheit
- Historic average summer temperature: 44.4 degrees
-- 2024 difference from historic average: +2.2 degrees
- Historic average summer temperature: 44.4 degrees
-- 2024 difference from historic average: +2.2 degrees
#23. Humboldt County
- Winter 2024 average temperature: 46.3 degrees Fahrenheit
- Historic average summer temperature: 42.7 degrees
-- 2024 difference from historic average: +3.6 degrees
- Historic average summer temperature: 42.7 degrees
-- 2024 difference from historic average: +3.6 degrees
#22. Amador County
- Winter 2024 average temperature: 46.2 degrees Fahrenheit
- Historic average summer temperature: 44.2 degrees
-- 2024 difference from historic average: +2 degrees
- Historic average summer temperature: 44.2 degrees
-- 2024 difference from historic average: +2 degrees
#21. Tehama County
- Winter 2024 average temperature: 46.0 degrees Fahrenheit
- Historic average summer temperature: 43.6 degrees
-- 2024 difference from historic average: +2.4 degrees
- Historic average summer temperature: 43.6 degrees
-- 2024 difference from historic average: +2.4 degrees
#20. Lake County
- Winter 2024 average temperature: 45.8 degrees Fahrenheit
- Historic average summer temperature: 43.8 degrees
-- 2024 difference from historic average: +2 degrees
- Historic average summer temperature: 43.8 degrees
-- 2024 difference from historic average: +2 degrees
#19. Inyo County
- Winter 2024 average temperature: 45.2 degrees Fahrenheit
- Historic average summer temperature: 42.4 degrees
-- 2024 difference from historic average: +2.8 degrees
- Historic average summer temperature: 42.4 degrees
-- 2024 difference from historic average: +2.8 degrees
#18. Madera County
- Winter 2024 average temperature: 45.0 degrees Fahrenheit
- Historic average summer temperature: 41.1 degrees
-- 2024 difference from historic average: +3.8 degrees
- Historic average summer temperature: 41.1 degrees
-- 2024 difference from historic average: +3.8 degrees
#17. Fresno County
- Winter 2024 average temperature: 44.0 degrees Fahrenheit
- Historic average summer temperature: 40.5 degrees
-- 2024 difference from historic average: +3.5 degrees
- Historic average summer temperature: 40.5 degrees
-- 2024 difference from historic average: +3.5 degrees
#15. Del Norte County (tie)
- Winter 2024 average temperature: 43.9 degrees Fahrenheit
- Historic average summer temperature: 40.3 degrees
-- 2024 difference from historic average: +3.6 degrees
- Historic average summer temperature: 40.3 degrees
-- 2024 difference from historic average: +3.6 degrees
#15. Mariposa County (tie)
- Winter 2024 average temperature: 43.9 degrees Fahrenheit
- Historic average summer temperature: 41.0 degrees
-- 2024 difference from historic average: +2.9 degrees
- Historic average summer temperature: 41.0 degrees
-- 2024 difference from historic average: +2.9 degrees
#14. El Dorado County
- Winter 2024 average temperature: 42.8 degrees Fahrenheit
- Historic average summer temperature: 40.5 degrees
-- 2024 difference from historic average: +2.3 degrees
- Historic average summer temperature: 40.5 degrees
-- 2024 difference from historic average: +2.3 degrees
#13. Tulare County
- Winter 2024 average temperature: 42.6 degrees Fahrenheit
- Historic average summer temperature: 39.2 degrees
-- 2024 difference from historic average: +3.4 degrees
- Historic average summer temperature: 39.2 degrees
-- 2024 difference from historic average: +3.4 degrees
#12. Shasta County
- Winter 2024 average temperature: 42.5 degrees Fahrenheit
- Historic average summer temperature: 40.0 degrees
-- 2024 difference from historic average: +2.4 degrees
- Historic average summer temperature: 40.0 degrees
-- 2024 difference from historic average: +2.4 degrees
#11. Placer County
- Winter 2024 average temperature: 42.2 degrees Fahrenheit
- Historic average summer temperature: 39.9 degrees
-- 2024 difference from historic average: +2.4 degrees
- Historic average summer temperature: 39.9 degrees
-- 2024 difference from historic average: +2.4 degrees
#10. Trinity County
- Winter 2024 average temperature: 41.2 degrees Fahrenheit
- Historic average summer temperature: 38.3 degrees
-- 2024 difference from historic average: +3 degrees
- Historic average summer temperature: 38.3 degrees
-- 2024 difference from historic average: +3 degrees
#9. Nevada County
- Winter 2024 average temperature: 40.7 degrees Fahrenheit
- Historic average summer temperature: 38.7 degrees
-- 2024 difference from historic average: +2 degrees
- Historic average summer temperature: 38.7 degrees
-- 2024 difference from historic average: +2 degrees
#8. Tuolumne County
- Winter 2024 average temperature: 39.6 degrees Fahrenheit
- Historic average summer temperature: 36.7 degrees
-- 2024 difference from historic average: +2.9 degrees
- Historic average summer temperature: 36.7 degrees
-- 2024 difference from historic average: +2.9 degrees
#7. Siskiyou County
- Winter 2024 average temperature: 37.8 degrees Fahrenheit
- Historic average summer temperature: 34.2 degrees
-- 2024 difference from historic average: +3.6 degrees
- Historic average summer temperature: 34.2 degrees
-- 2024 difference from historic average: +3.6 degrees
#6. Sierra County
- Winter 2024 average temperature: 35.8 degrees Fahrenheit
- Historic average summer temperature: 32.8 degrees
-- 2024 difference from historic average: +3 degrees
- Historic average summer temperature: 32.8 degrees
-- 2024 difference from historic average: +3 degrees
#5. Plumas County
- Winter 2024 average temperature: 35.6 degrees Fahrenheit
- Historic average summer temperature: 32.6 degrees
-- 2024 difference from historic average: +3 degrees
- Historic average summer temperature: 32.6 degrees
-- 2024 difference from historic average: +3 degrees
#4. Modoc County
- Winter 2024 average temperature: 35.4 degrees Fahrenheit
- Historic average summer temperature: 30.3 degrees
-- 2024 difference from historic average: +5.1 degrees
- Historic average summer temperature: 30.3 degrees
-- 2024 difference from historic average: +5.1 degrees
#3. Lassen County
- Winter 2024 average temperature: 34.6 degrees Fahrenheit
- Historic average summer temperature: 30.7 degrees
-- 2024 difference from historic average: +3.9 degrees
- Historic average summer temperature: 30.7 degrees
-- 2024 difference from historic average: +3.9 degrees
#2. Alpine County
- Winter 2024 average temperature: 34.1 degrees Fahrenheit
- Historic average summer temperature: 30.2 degrees
-- 2024 difference from historic average: +3.9 degrees
- Historic average summer temperature: 30.2 degrees
-- 2024 difference from historic average: +3.9 degrees
#1. Mono County
- Winter 2024 average temperature: 31.9 degrees Fahrenheit
- Historic average summer temperature: 28.4 degrees
-- 2024 difference from historic average: +3.5 degrees
- Historic average summer temperature: 28.4 degrees
-- 2024 difference from historic average: +3.5 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