2025 Compare Cities Climate:
Mercer Island, WA vs Castle Rock, WA

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Highlights
- Castle Rock has 55.1% more rainy days than Mercer Island.
- Castle Rock has 10.9% less Sunny Days than Mercer Island.
- On the BestPlaces comfort index, Castle Rock scores 5.3% worse than Mercer Island
 Mercer Island, WACastle Rock, WAUnited States
 Rainfall  Unlock6138
 Snowfall5  Unlock28
 Precipitation  Unlock181106
 Sunny156  Unlock205
 Avg. July High  Unlock7786
 Avg. Jan. Low37  Unlock22
 Comfort Index (higher=better)  Unlock7.17
 UV Index2.6  Unlock4.3
 Elevation  Unlock562443
Reviews for Mercer Island    4 Reviews

Mercer Island is a wonderful family community. It feels much more "small town" than a city even though it has a population of 20,000+. People say hello and watch out  More

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Mercer Island is a suburb of Seattle, located on an island in Lake Washington. The best thing about Mercer Island is its strategically central location relative to the  More

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Mercer Island is a suburb of Seattle, located on an island in Lake Washington. The best thing about Mercer Island is its strategically central location relative to the  More

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Reviews for Castle Rock    1 Reviews

Over 14 years ago

As a whole I rate the education system as a negative. Alot of the teachers do not notify you of your childs progress especiallt if they are behind. We found out how  More

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