Downtown from Alaskan Way Viaduct, 1959 (via Seattle Municipal Archives) Compare to: http://www.flickr.com/photos/manwhoyells/4389274938/ So clean! Judging from the cloud formations, local weather experience, foliage visible on Beacon Hill, and brown grass on the railroad tracks, I estimate this photo was taken in late Summer or early Fall, when the evenings have just started to get a bit chilly. I have posed the question to local atmospheric scientist Cliff Mass. I hope he replies. UPDATE: Cliff Mass said, I would guess spring….those are cumulus clouds associated with instability…which is a max in spring.  April or May?…cm Ah, I had ruled out early Spring due to the full trees, but mid or late Spring may be possible. Well played, Mr. Mass.
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Downtown from Alaskan Way Viaduct, 1959 (via Seattle Municipal Archives)

Compare to: http://www.flickr.com/photos/manwhoyells/4389274938/

So clean! Judging from the cloud formations, local weather experience, foliage visible on Beacon Hill, and brown grass on the railroad tracks, I estimate this photo was taken in late Summer or early Fall, when the evenings have just started to get a bit chilly.

I have posed the question to local atmospheric scientist Cliff Mass. I hope he replies.

UPDATE: Cliff Mass said,

I would guess spring….those are cumulus clouds associated with instability…which is a max in spring.  April or May?…cm

Ah, I had ruled out early Spring due to the full trees, but mid or late Spring may be possible. Well played, Mr. Mass.

Source: Flickr / seattlemunicipalarchives