Here's a list of the 10 worst weather states in the U.S.: California. Extreme weather score: 73.1. ... Minnesota. Extreme weather score: 68.6. ... Illinois. Extreme weather score: 67.8. ... Colorado. Extreme weather score: 67. ... South Dakota. Extreme weather score: 64.5. ... Kansas. Extreme weather score: 63.7. ... Washington. ... Oklahoma. More items... Oct 28, 2021