2026 Compare Cities Climate:
Castro Valley, CA vs Greenhorn, CA

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Highlights
- Greenhorn has 190.1% more rainy days than Castro Valley.
- Greenhorn has 7.7% less Sunny Days than Castro Valley.
- On the BestPlaces comfort index, Greenhorn scores 19.8% worse than Castro Valley
 Castro Valley, CAGreenhorn, CAUnited States
 Rainfall  Unlock6238
 Snowfall0  Unlock28
 Precipitation  Unlock87106
 Sunny261  Unlock205
 Avg. July High  Unlock8686
 Avg. Jan. Low42  Unlock22
 Comfort Index (higher=better)  Unlock6.97
 UV Index5.4  Unlock4.3
 Elevation  Unlock44362443
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 12 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 Greenhorn    1 Reviews

I'm not sure how they got the description of Greenhorn so wrong. I live here- there is nothing here except Greenhorn Ranch, which is only open to guests who book their  More

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