There are several correlations that vary from simple formulations, where The sky temperature depends only on the dry air temperature, to more complex formulations, where the sky temperature depends also on the air water vapor tension and the sky cloud cover. This paper might be useful.
There are several correlations that vary from simple formulations, where The sky temperature depends only on the dry air temperature, to more complex formulations, where the sky temperature depends also on the air water vapor tension and the sky cloud cover. This paper might be useful.