Plain English Meaning
What the air is doing right now and what it is expected to do — how warm or cold it is, how the wind is blowing, how clear or cloudy the sky is, and whether rain, snow, or storms are present.
Full Definition
The state of the atmosphere at a given time and place, described by variables such as temperature, pressure, humidity, wind, visibility, cloud cover, and precipitation. In aviation, weather refers specifically to those atmospheric conditions that affect flight planning, aircraft performance, and .