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 Amazing Nebula in Orion Amazing Nebula in Orion
I wanted to share these amazing images I took during our clear nights this winter from the Constellation Orion. These were imaged on Jan.20th, Jan. 28th,29th and Feb.14th & 22nd of this year from my backyard in Sedro Woolley WA.
YouNews 8k raised for Boy with Brain Cancer 8k raised for Boy with Brain Cancer
Joel Thomas Alldredge, son of Micah and Nancy Alldredge, and Older brother of Eli, is an amazing 5 year old boy. He is full of love for all those around him.