Weather is the state of the atmosphere at a given time and place. Most weather takes place in the troposphere, the lowest layer of the atmosphere.
Weather is described in a variety of ways by meteorologists, scientists who study and predict weather. Air temperature and pressure, the amount and type of precipitation, the strength and direction of wind, and the types of clouds are all described in a weather report.
Weather changes each day because the air in our atmosphere is always moving, redistributing energy from the Sun. In most places in the world, the type of weather events expected vary through the year as seasons change. While weather can change rapidly, climate changes slowly, over decades or more, in response to changes in the factors that determine our climate.
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Real Climate: climate science from climate scientists
Global Learning and Observations to Benefit the Environment