Weather is the state of the atmosphere , to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy.
Most weather phenomena occur in the troposphere , just below the stratosphere.
Weather refers to day-to-day temperature and precipitation activity, whereas climate is the term for the statistics of atmospheric conditions over longer periods of time.
When used without qualification, "weather" is generally understood to mean the weather of Earth.
Weather is driven by air pressure, temperature and moisture differences between one place and another.
These differences can occur due to the sun's angle at any particular spot, which varies by latitude from the tropics.
The strong temperature contrast between polar and tropical air gives rise to the jet stream.
Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow.
Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year.
On Earth's surface, temperatures usually range ±40 °C (−40 °F to 100 °F) annually.
Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location.
Human attempts to control the weather have occurred throughout human history, and there is evidence that human activities such as agriculture and industry have modified weather patterns.
However, weather is not limited to planetary bodies. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System.
The movement of mass ejected from the Sun is known as the solar wind.
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