2025 Compare Cities Climate:
Castro Valley, CA vs Boulder, CO

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Highlights
- Boulder has 15.0% less rainy days than Castro Valley.
- Boulder has 6.1% less Sunny Days than Castro Valley.
- On the BestPlaces comfort index, Boulder scores 17.4% worse than Castro Valley
 Castro Valley, CABoulder, COUnited States
 Rainfall  Unlock1838
 Snowfall0  Unlock28
 Precipitation  Unlock88106
 Sunny261  Unlock205
 Avg. July High  Unlock8886
 Avg. Jan. Low42  Unlock22
 Comfort Index (higher=better)  Unlock7.17
 UV Index5.4  Unlock4.3
 Elevation  Unlock53282443
Reviews for Castro Valley    7 Reviews

CURMUDGEON - THANK YOU for your post. The most important part of your comment is your second paragraph. "Hodge-Podge" is the correct word for a lot of Castro  More

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Over 11 years ago

Kind of rural but close to Oakland and San  More

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Castro Valley is the largest unincorporated "city" in the Bay Area. Over the years, several attempts have been made to incorporate, but they have all been defeated at  More

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Reviews for Boulder    55 Reviews

Outside of the university, Boulder had a very distinctive "wealthy hippy" feel. A lot of alternative medicine and a matching ethos. This is changing some among my  More

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We moved here from Texas about 4 years ago and love it here! The amazing sense of community and high regard for the environment are two of the main reasons we love  More

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Over 5 years ago

Most people do much worse than Boulder. I'm the most critical person I've ever met who is never happy or satisfied -- so that's a pretty huge compliment.   More

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