I had to look this up - apparently it's around 0C if you do this! https://mynasadata.larc.nasa.gov/sites/default/files/2018-12/Measuring%20the%20Temperature%20o

I had to look this up - apparently it's around 0C if you do this! https://mynasadata.larc.nasa.gov/sites/default/files/2018-12/Measuring%20the%20Temperature%20of%20the%20Sky%20and%20Clouds.pdf https://mynasadata.larc.nasa.gov/sites/default/files/2018-12...