Which weather condition would NOT be reported with a distinct meteorological code?

Humidity is the correct answer because it is typically expressed as a percentage and is not reported using a distinct meteorological code like the others in the given options. In meteorological observations, weather phenomena such as drizzle, fog, and cloudy conditions are associated with specific codes or abbreviations that are standardized and universally recognized within the field. For example, drizzle would be coded differently than heavy rain, and fog has a particular code that indicates reduced visibility due to moisture in the air.

Humidity, on the other hand, is considered a more general atmospheric descriptor rather than a specific weather event or phenomenon. It provides information about the moisture level in the air but does not represent a condition that can be distinctly characterized with a coding system used in weather reports. This distinction underscores why humidity does not receive a unique meteorological code while the other weather conditions do.