Ask HN: What temperature are your mountains?

This is a literal question. If you can see mountains outside can you please tell me what temperature they are with your cheap infrared thermometer? (if you have one). Why am I asking? I don’t have mountains outside, I am really curious, and I can’t find the answer online. It’s a dry clear night here in the midwest and I just measured the sky at -40C(-40F). Far away trees and buildings are around the temp outside. In the past clouds going by were 10C less than air temp. The sun has been hotter than outside, but I have only gotten a reading +15C over air temp so far. I think it would be so darn cool if you can take the temperature of mountains 10-20 miles away with a $15 thermometer.