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Tuesday, 5 July 2011

Definition

Definition

Part of the Nature series on
Weather
 
Calendar seasons
Spring · Summer
Autumn · Winter
Tropical seasons
Dry season · Wet season
Storms
Thunderstorm · Supercell
Downburst · Lightning
Tornado · Waterspout
Tropical cyclone (Hurricane)
Extratropical cyclone
Winter storm · Blizzard · Ice storm
Dust storm · Firestorm  · Cloud
Precipitation
Drizzle · Rain  · Snow · Graupel
Freezing rain · Ice pellets · Hail
Topics
Meteorology · Climate
Weather forecasting
Heat wave · Air pollution
Weather portal

Climate (from Ancient Greek klima, meaning inclination) is commonly defined as the weather averaged over a long period.[3] The standard averaging period is 30 years,[4] but other periods may be used depending on the purpose. Climate also includes statistics other than the average, such as the magnitudes of day-to-day or year-to-year variations. The Intergovernmental Panel on Climate Change (IPCC) glossary definition is:
Climate in a narrow sense is usually defined as the "average weather," or more rigorously, as the statistical description in terms of the mean and variability of relevant quantities over a period ranging from months to thousands or millions of years. The classical period is 30 years, as defined by the World Meteorological Organization (WMO). These quantities are most often surface variables such as temperature, precipitation, and wind. Climate in a wider sense is the state, including a statistical description, of the climate system.[5]

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