« Air District lifts Winter Spare the Air Alert | Main | NOAA's Winter Outlook »

November 21, 2008

UV Index Difference - Summer vs. Now

Share 

Q: Why is the UV index around 3 on a 80 degree sunny day in November, but the UV index is 10 during the summer when the sky and temperature are the same?

A: The intensity of UV radiation is a function of the sun's angle to the Earth because certain gases in the atmosphere block UV radiation. The higher the sun is in the sky, which is maximized during the summer, the least amount of atmosphere it has to travel through. The sun angle is low now and the extra atmosphere it has to travel through restricts the UV radiation.

Nice hearing from you. I appreciate the question..

Mike

Posted by KGOAdminstrator at 08:01:10 PM

TrackBack

TrackBack URL for this entry:
http://www.typepad.com/services/trackback/6a00d83452295869e201053617a099970c

Listed below are links to weblogs that reference UV Index Difference - Summer vs. Now :

Comments

Feed You can follow this conversation by subscribing to the comment feed for this post.

Verify your Comment

Previewing your Comment

Posted by: |

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment