I could have gone my whole life without knowing......

[emily_in_nc]

We have two temperature sensors outside the house. One, at 1' above driveway level, north side, in the shade. The second, mounted against the house, still north facing, but up on the second level, above the deck, and must catch a lot of radiant heating. On a hot day, the second one typically reads at least 10 degrees higher than the first.