Climate
Climate refers to the long-term average patterns of temperature, precipitation, wind, and other atmospheric conditions in a region, typically measured over a 30-year period. Unlike weather, which describes short-term atmospheric conditions, climate represents the statistical summary of a region's typical weather over decades. Understanding climate is essential for agriculture, urban planning, disaster preparedness, and studying the effects of global climate change.
Major Climate Zones and Their Characteristics
| Climate Zone | Average Temperature | Annual Rainfall | Example Region |
|---|---|---|---|
| Tropical | 24–30°C | > 2000 mm | Amazon Basin |
| Arid (Desert) | 20–45°C | < 250 mm | Sahara Desert |
| Temperate | 10–20°C | 500–1500 mm | Western Europe |
| Continental | -5 to 15°C | 300–700 mm | Central Russia |
| Polar | -40 to 0°C | < 250 mm | Antarctica |
| Mediterranean | 15–25°C | 400–900 mm | Southern India Coast |
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Related Terms
Precipitation
Precipitation is any form of water — liquid or solid — that falls from the atmosphere to the Earth's surface, including rain, snow, sleet, and hail. It forms when water vapor in clouds condenses or freezes around tiny particles called condensation nuclei, growing until droplets or crystals become heavy enough to fall. Precipitation is a critical component of the hydrological cycle, replenishing freshwater supplies in rivers, lakes, and groundwater systems.
Atmospheric Pressure
Atmospheric pressure is the force per unit area exerted by the weight of the overlying column of air in the atmosphere on any surface below it. At sea level, the standard atmospheric pressure is 101,325 Pa (or 1013.25 hPa / 1 atm), and it decreases with altitude as the mass of air above decreases. Atmospheric pressure differences drive wind and weather systems: low-pressure zones are associated with storms and clouds, while high-pressure zones bring clear, calm conditions.
Humidity
Humidity is the measure of water vapor present in the air, expressed either as absolute humidity (mass of water per unit volume of air) or relative humidity (percentage of water vapor relative to the maximum possible at that temperature). Warmer air can hold more water vapor, so the same amount of moisture feels "drier" on a hot day than a cool day, which is why relative humidity is the most commonly reported measure. High humidity reduces the body's ability to cool itself through sweating, making heat feel more intense and posing health risks during heatwaves.
From Greek "klima" (κλίμα) meaning "slope" or "zone of latitude," originally referring to the inclination of the sun's rays at different latitudes. The term entered English via Latin "clima" in the 14th century.