Which of the following is NOT typically included in weather information provided by ATC?

The correct choice indicates that humidity levels are generally not part of the standard weather information provided by Air Traffic Control (ATC). ATC focuses on information that directly affects the safety and efficiency of air traffic operations. Important weather elements that are commonly provided include wind direction, visibility, and precipitation, as these factors can significantly impact flight operations, such as takeoff and landing.

Wind direction is crucial for pilots to align their aircraft with the landing or takeoff path effectively. Visibility information allows pilots to understand how far they can see, which is vital for navigation and maintaining safe distances from other aircraft and obstacles. Precipitation reports inform pilots about rain, snow, or other weather phenomena that may impair visibility or affect runway conditions.

Humidity, while it has indirect effects on flight performance (like impacts on engine efficiency or visibility due to dew), is not a primary concern communicated by ATC in real-time operational contexts. Consequently, it is not typically included in the weather briefings provided to pilots during flight. This emphasis on more critical weather factors is aligned with the operational needs of air traffic management to ensure safety and efficiency in the airspace.