Meteorology is a branch of the atmospheric sciences (which include atmospheric chemistry and atmospheric physics) with a major focus on weather forecasting. The study of meteorology dates back millennia, though significant progress in meteorology did not begin until the 18th century. The 19th century saw modest progress in the field after weather observation networks were formed across broad regions.
Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. On Earth, most weather phenomena occur in the lowest layer of the planet’s atmosphere, the troposphere, just below the stratosphere.
Weather refers to day-to-day temperature, precipitation, and other atmospheric conditions, whereas climate is the term for the averaging of atmospheric conditions over longer periods of time. When used without qualification, “weather” is generally understood to mean the weather of Earth.
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- Philatelic Database: Talking Weather – Meteorology on Stamps
- Rochester Philatelic Association: A Philatelic Look at the Weather
- WMO: Drought and Desertification in Postage Stamps
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