Abstract
Night-minus day-measured relative humidity differences are used to calculate mean temperature differences between the hygristor of the U.S. National Weather Service rawinsondes and the ambient air. Calculations are made on four types of tropical weather systems in the western Pacific. The dependency of hygristor daytime temperature on solar radiation is shown and its relationship with the cloud distribution in each weather system (typhoon, cloud cluster, cloud cluster environment, clear region) is discussed. The total opaque sky cover proved to be a useful parameter in determining the day vs night hygristor temperature differences.
