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Why is Olympia, WA Wetter Than Seattle, WA?


Thunder98

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Rain shadowing from the Olympics.

 

SW flow accounts for a large percentage of our region's heaviest rain events, and Seattle experiences much greater shadowing from that direction than Olympia since the Willapa Hills are so much lower.

 

And moisture can flow in uninterrupted for the most part through the Chehalis Gap/Valley into Olympia.

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Mercer Island, 350 ft

2021-2022: 11.6", 02/21

2020-2021: 15.6"

2019-2020: ~10"

2018-2019 winter snowfall total: 29.5"

2017-2018: 9.0", 2016-2017: 14.0"

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