Ok, this is a short post, but I HAD to comment. I don't have a clue what's going on with my experiment. The world is backwards all of a sudden?
After the first reading I gave (8 degrees), the rest of them have been wrong. Not just by a little, but by a ton! In fact, they've been the opposite?!? I don't know what's going on, but the 7 or 5 degree temperature swings have been in FAVOR of the outside temp, not inside the hoop cover. Like right now, it's 42 degrees outside and 38 degrees inside my hoop cover! That makes no sense.
Well there's one possibility. To get the temperature gauge out of the direct sun, I rested it on top of my chimney leaning against the siding of my house. It's possible that it was getting heat coming off my house or bleading out. So for now I moved it to the gravel, leaning up against the side of my chimney, but still under the eve to keep dry. The temp's dropped a few degrees but it's still a four degree swing in the wrong direction. What's more it's only 38 degrees inside my hoop cover. That's way too cold! Grrr. What's going on here? Any ideas? Bizare, I know.