1. Sitka, Alaska: 243 overcast days per year
2. Cape Flattery, Washington: 235 overcast days per year
3. Unalaska, Alaska: 230 overcast days per year
4. Friday Harbor, Washington: 228 overcast days per year
5. Astoria, Oregon: 227 overcast days per year
6. Aberdeen, Washington: 226 overcast days per year
7. Hoonah, Alaska: 224 overcast days per year
8. Newport, Oregon: 223 overcast days per year
9. Port Angeles, Washington: 222 overcast days per year
10. Petersburg, Alaska: 221 overcast days per year
These cities are all located in the Pacific Northwest region of the United States, which is known for its rainy and overcast weather.