Black body radiation was my thought as well. It may not be the average including the inner layers, but it’s the average at the crust. About -1°F according to Wikipedia.
To add to this, is probably hard because the composition of the interior of the earth is a lot of guesswork. We can only directly observe how much heat is coming out of it.







GrapheneOS has benefits even when used with Google Play Services. At least on the primary profile, you can install the Phone by Google and get good call spam blocking. Other apps that you’d prefer to be siloed can be put on another profile without play services.