With the weather turning, I thought this was an interesting comparison. One of these is my internal tracker in the loft and the other one is on my mast, 10m above the ground.
The plot is for the last year so you can clearly see winter and summer.
I’ve drawn lines to indicate the overall low and high temperatures. Which do you think is the internal one, and which is the external one?
/edit - You can click the image for a larger version.