Well, it's a really good start. Total insolation is a great, ah, trend marker. Higher insolation planets tend to be warmer. Of course, insolation itself stop

Well, it's a really good start. Total insolation is a great, ah, trend marker. Higher insolation planets tend to be warmer. Of course, insolation itself stops looking less like a number and more like a function. After all, you're getting photons of different wavelengths (pretend the sun in question is a blackbody) and so that feeds into absorption, reflection, and transmission of each frequency component versus the local atmosphere. Local atmosphere is a function of surface gravity, orbital velocity (you have to scoop up those gases after all), geologic activity, possible tidal lock, and temperature. Whoops! Back to where we started. But it is still a great trend. Very low-mass planets are in some ways easier to model. If they are far from a star, any gases that wouldn't escape would freeze and just fall down as another layer of the planet. If they are close to a star, you're just not going to have much atmosphere for long. Once you are big enough to retain an atmosphere, stuff can get wonky.