2025 Compare Cities Climate:
Altadena, CA vs Mercer Island, WA

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Highlights
- Mercer Island has 74.2% more rainy days than Altadena.
- Mercer Island has 45.6% less Sunny Days than Altadena.
- On the BestPlaces comfort index, Mercer Island scores 17.6% worse than Altadena
 Altadena, CAMercer Island, WAUnited States
 Rainfall  Unlock3938
 Snowfall0  Unlock28
 Precipitation  Unlock153106
 Sunny287  Unlock205
 Avg. July High  Unlock7686
 Avg. Jan. Low47  Unlock22
 Comfort Index (higher=better)  Unlock7.57
 UV Index6.2  Unlock4.3
 Elevation  Unlock3352443
Reviews for Altadena    1 Reviews

I live just above the 1500 foot elevation at the edge of the San Gabriel Mountains in the L.A. suburb of Altadena--just above Pasadena. We're above the low morning fog  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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