Was surprised to find some little patches of frost on the lawn early this morning. Did a bit of googling and was even more surprised to learn that, with the right set of conditions, ground temperature can be as much as 10 degrees cooler than the temperature five or so feet above the ground - the height at which temps are reported.
What Causes Frost?.
Reminds me. We're giving the hobby of tropical hibiscus one more try. Any fellow enthusiasts looking in here?