3 Climate Zones

How climate zones are defined

Climate zones group places by recurring patterns of temperature and precipitation over long periods, commonly based on climate records spanning decades. They describe long-term conditions rather than the weather on a particular day. The Köppen–Geiger system groups climates according to temperature and the amount and seasonality of precipitation.

The system has five major groups: tropical, dry, temperate, continental, and polar. Highland climates are also often treated as a distinct regional climate because elevation can make them differ sharply from nearby lowlands. These broad descriptions are not rigid rules; detailed thresholds and subdivisions distinguish further patterns within each zone.

Tropical and dry climates

A Tropical climate stays warm or hot throughout the year, with relatively small seasonal temperature changes. Precipitation is often abundant, but its timing varies: some areas are wet year-round, while others have distinct wet and dry seasons.

A Dry climate is defined by limited moisture relative to the moisture that could evaporate, not necessarily by high temperatures. Dry regions can be hot or cold and may have large temperature swings between day and night or between seasons. Deserts are especially dry; semiarid steppes receive somewhat more precipitation.

Temperate and continental climates

A Temperate climate generally has mild winters and warm to hot summers. Its seasonal temperature changes are noticeable but usually less extreme than those in a continental climate. Precipitation may fall throughout the year or be concentrated in a wet season; some temperate regions have dry summers, while others receive summer rainfall.

A Continental climate has a stronger seasonal temperature contrast, commonly with warm or hot summers and cold winters. Precipitation varies: it may occur throughout the year or peak in a particular season, and winter precipitation often falls as snow.

Polar and highland climates

A Polar climate is very cold for most or all of the year and has short, cool summers. Precipitation is usually low, with much of it falling as snow. Snow and ice can persist despite the small amount of precipitation because temperatures are low.

A Highland climate changes with elevation: higher locations are generally cooler than nearby lowlands, and conditions can vary over short distances. Precipitation varies with slope and location. Mountains can cause one side to receive more precipitation while another lies in a rain shadow.

Reading temperature and precipitation patterns

Two questions help distinguish climate patterns: How warm or cold is a place over the year, and how much precipitation falls and when? Annual precipitation totals alone may hide important differences. Two places can receive similar amounts over a year even though one has rain in every season and the other receives nearly all its rain during a short wet season.

Latitude helps shape temperature. Regions near the equator generally receive more direct sunlight and tend to be warmer, while regions nearer the poles receive less direct sunlight and tend to be colder. Latitude does not determine climate by itself: elevation, distance from the ocean, ocean currents, and regional geography also affect local temperatures and rainfall.

For example, a tropical wet-and-dry region stays warm throughout the year but has markedly different rainfall between its rainy and dry seasons. A continental region is distinguished by a much larger seasonal temperature range, often including cold winters; its precipitation may be spread through the year or vary by season.