Weather is the condition of the atmosphere in a local environment or region over a short period of time, ranging from an exact instant to a few days. This is distinct from climate, which refers to persistent atmospheric systems over larger areas and greater time periods. The atmospheric conditions may be hot or cold, dry or humid, rainy or dry, windy or calm, cloudy or clear in combination.

The atmosphere is the envelope of air that surrounds the surface of the earth. It has four layers: They are the troposphere, the stratosphere, the mesosphere, and the thermosphere. The term atmosphere also means the weight of the air pressing against the earth at any given point on earth. At sea level the weight of the air is ...

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