Not sure if this is the place to post this thread, but here it goes:
The summer solstice is fast approaching. This means (at least for us in the lower portion of the US) that during the 2 weeks before and the 2 weeks immediately after, we are peppered with a higher concentration of UV as the sun is closest to its zenith and at its zenith in our hemisphere at the Tropic of Cancer. July and August might be hotter, but less UV is actually reaching us (relatively speaking) as the sun is already moving back to the equator (I know, the earth is tilting; the sun is not actually moving).
Should we expect higher FC loss during these next 4 weeks or is it a wash due to higher temperatures in the Jul/Aug? I know I'm probably worrying about the wrong thing, but it's an interesting topic and also one that should be kept in mind for sunscreen diligence.