Sorry, it isn't that complicated.
Wind chill is the effect of wind on living creatures like human beings. Wind sucks heat out of you faster than still air, so you feel colder. A rock, or anything else that assumes the ambient temperature, will be at 32 degrees if the air temperature is 32 degrees. If the wind is fifty miles per hour, the rock will still be at 32 degrees. A human being will feel much colder, and his body heat will be drained much faster.
I suspect trees hold some heat for a short time from warmer parts of the day, like rocks or other inanimate objects. They don't generate perceptible real heat. Unless, of course, you set part of it on fire, a common survival technique.