Changes in UVA/UVB during the day

Take a look at how UVA and UVB levels change on a typical cloudless summer day:

Changes in UVA and UVB levels
on a typical cloudless summer day*

Time UVA (%) UVB (%) UVC (%)
Sunrise - 9:00 60 12,5 0
9:00 - 11:00 90 20 0
11:00 - 13:00 95 95 0
13:00 100 100 0
13:00 - 15:00 95 95 0
15:00 - 17:00 90 20 0
17:00 - sunset 60 12,5 0
*Relative to intensity of UVA and UVB, respectively, at the solar zenith (13:00).

Reference:
Hawk, J.L.M. McGregor, J. (2000-2005) Understanding your skin: sunlight & skin cancer. Family Doctor Publications.

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