2026 Compare Cities Climate:
Castro Valley, CA vs San Tan Valley, AZ

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Highlights
- San Tan Valley has 53.5% less rainy days than Castro Valley.
- San Tan Valley has 11.9% more Sunny Days than Castro Valley.
- On the BestPlaces comfort index, San Tan Valley scores 15.1% worse than Castro Valley
 Castro Valley, CASan Tan Valley, AZUnited States
 Rainfall  Unlock1038
 Snowfall0  Unlock28
 Precipitation  Unlock32106
 Sunny261  Unlock205
 Avg. July High  Unlock10586
 Avg. Jan. Low42  Unlock22
 Comfort Index (higher=better)  Unlock7.37
 UV Index5.4  Unlock4.3
 Elevation  Unlock15162443
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 San Tan Valley    2 Reviews

Over 7 years ago

I’ve lived here for nearly two years now. I find it to be a great place to live with a few drawbacks. 1.) There is no highway access and results in messy traffic  More

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Over 9 years ago

This place is AWFUL what a mistake we made! Schools are crap & constantly begging for supplies, traffic gets worse by the day as they continue to throw up subdivisions,  More

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