How Do You Measure A Sunny Day?

Tools

By By Steve Pool

SEATTLE - In Sept. 3's column, we talked about how Seattle is near the bottom in the U.S. with only an average of 58 sunny days a year. But it's not like a weather observer looks up at noon, sees the sun, and calls it a sunny day.

There are sensors that can actually measure when the sun is indeed shining on it. These sensors will track the number of seconds the sun was shining on it, and divide it by the number of seconds of daylight for that given day.

If the sun shone on the sensor for 70% or more of the day, it's considered a sunny day. If it was between 20-70% of the time, it was a partly cloudy day, and 20% or less, it's a cloudy day.

Your Photos

YouNews It's Quadruplets! It's Quadruplets!
On May 2, I found a newly built Dark-eyed Oregon Junco nest in one of my hanging baskets. By May 9 we had 4 eggs. This past Monday, May 18, the eggs hatched, 3 between 9am and noon, the final one during the night into Tuesday.
YouNews What can I say What can I say
I know this is a "played out" location - but I couldn't resist as the weather was so nice tonight!