UV radiation HIGHEST during SUMMER ....
Took me all of about two seconds to find this on the Internet:Directly from the EPA web site: http://www.epa.gov/sunwise/uvradiation.html, about half-way down the web page:"Time of YearThe sun's angle varies with the seasons, causing the intensity of UV rays to change. UV intensity tends to be highest during the summer months." The EPA is generally considered to be a fairly respected source of technical information. Bottom line, on average, for most areas, UV is strongest in the summer. There will be, no doubt, some sites where certain conditions, like haze, humidity, etc. that might have more blocking in the summer than in the winter when it's humidity is lowest and would thefore could have more UV in the winter, I suppose.Chuck: Hey! Great web site link! I really liked that.