It has been cold enough but snow along Capitol Hill’s 15th Ave E peak is marketing not meteorology.
The small icy drifts along E Harrison just off 15th have been noted on social media including this thread on “Mystery snow in Capitol Hill” and pondered by passersby:

Bluesky user Nun Ya was on the case Monday night
What is left of the U-Haul truck’s worth of snow is the result of some fun from a local ski hotshot and Capitol Hill outdoor and gear retailer Windthrow.
CHS introduced the new shop and owner Nate Hoe in 2023 as the store set out to build a community hub for outdoor lovers at the top of Capitol Hill. “Almost everything I carried was stuff I already loved before,” Hoe told CHS at the time.
The results of this weekend’s snowy goof on E Harrison were posted here for you to enjoy the urban freeskiing action.
Windthrow is open at 345 15th Ave E. Visit windthrow.store to learn more.
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During one of the big Seattle snow dumps around 10 years ago, there were snowmobiles cruising Madrona. Probably Tech Bros, but still memorable in a good way.