In which situation is it unnecessary to determine the wet-bulb temperature to obtain the dew point?

Determining the wet-bulb temperature is not necessary to obtain the dew point when freezing fog is present. Freezing fog occurs when the air temperature is at or below freezing, and the presence of microscopic supercooled water droplets can contribute to the formation of ice. In such cases, the conditions are often highly saturated, meaning the relative humidity approaches or equals 100%. This saturation allows for the calculation of dew point temperature directly from the dry-bulb temperature without needing to account for wet-bulb measurements, which are typically used to calculate dew point in less extreme humidity conditions.

In contrast, high humidity levels, dry-bulb temperatures above 0°F, or indoor measurements could still involve variability where wet-bulb temperature might help refine dew point calculations, especially when conditions fluctuate. However, when dealing with freezing fog, the saturated conditions simplify the determination of dew point, making it unnecessary to incorporate the wet-bulb temperature into the equation.