Why Is It Warmer At Night In Seattle?

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By By Steve Pool

SEATTLE - Have you ever noticed on clear nights that the temperatures in Seattle metro area tend to be warmer than the outlying areas?

Think of the city as its own personal furnace as it can generate its own heat. The concrete buildings and road pavement in city areas will absorb the day's sunlight and radiate that heat out during the night, acting like a natural heater. It usually keeps Seattle anywhere from 3-10 degrees warmer at night than the rural areas.

It can also lead to warmer daytime temperatures -- especially on hot, sunny days. Although in Seattle, the effect is mitigated by nearby water, other cities can be 6-8 degrees hotter on sunny days than their rural counterparts.

Your Photos

YouNews Waiting their turn Waiting their turn
A Washington State Ferry waits its turn to dock at the Lopez Island Ferry Terminal as the sun rises over Mount Baker in the background.
YouNews Reflection Reflection
During my time in Seattle, WA, I've had the opportunity to take all sorts of interesting pictures. There is water everywhere here, and in this shot; it provides a perfect mirror to the road above.
YouNews Weekend Sky Objects Weekend Sky Objects
These images were taken Friday and Saturday under with a bright moon. M42 is a 45 minute stack of 122 frames and M15 is a 34 minute stack of 14 frames. A Meade 6-inch refractor
and a Nikon D3100 was used for all the images. Stacking was
done with Deep Sky Stacker (freeware).