Quick question for all. Why is that the temp at 2300' is usually warmer than the temp at the base?

I understand radiational cooling comes into play, but I have been sort of tracking this and see the temp higher at the 2300' weather station when it is cloudy as well.

Additionally the temp at the next station and it's predecessors at higher elevations have a lower temp as well.

Basically it seems to be a warm "spot" on a consistent basis.

I apologize if this is a basic question and there is a simple answer.