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

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Highlights
- Mercer Island has 110.8% more rainy days than Castle Rock.
- Mercer Island has 35.8% less Sunny Days than Castle Rock.
- On the BestPlaces comfort index, Mercer Island scores 4.2% better than Castle Rock
 Castle Rock, COMercer Island, WAUnited States
 Rainfall  Unlock3938
 Snowfall78  Unlock28
 Precipitation  Unlock153106
 Sunny243  Unlock205
 Avg. July High  Unlock7686
 Avg. Jan. Low19  Unlock22
 Comfort Index (higher=better)  Unlock7.57
 UV Index4.8  Unlock4.3
 Elevation  Unlock3352443
Reviews for Castle Rock    12 Reviews

My fiance and I moved here in 2018 shortly after finishing college. I work in Colorado Springs and she works in the Denver area, so Castle Rock was practically our only  More

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Over 7 years ago

I have always been mobile for my career, until I moved to Castle Rock. I've lived in in multiple cities in the Midwest including Chicago and have visited nearly every  More

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Over 11 years ago

we have four seasons, and the rockies are only two hrs.away. so for the outdoors enthusist sking or hiking is like no other place you have been or seen it is hard to  More

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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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