Tune your engine to run well, and take it's temperature. THAT's normal. This winter, "normal" will be something else. If you change props, or mufflers, or fuel, or installations (cowled vs uncowled), well....then "normal" will be something different again.

Because of the wildly varying installations, tuning, etc....There is no one size fits all "normal" temp.

Temp guns should have a sticker on them that says "For entertainment purposes only".