Climate Zones

Climate zones are largely determined by 2 factors:

Temperature

and

Rainfall

Using data from temperature and rainfall,

we can make climographs

Check these 2 graphs.

How are they different?

What do we know about weather/climate? Which area of the world could these be from?

Areas that have similar rainfall and temperature will share a

similar climate zone.

The Köppen Climate Classification System

The most widely used for classifying the world's climates.

Köppen divided the Earth's surface into climatic regions that generally

coincided with world patterns of vegetation and soils.

The Köppen system recognizes five major climate

types based on the annual and monthly averages of

temperature and precipitation. Each type is

designated by a capital letter.

A, B, C, D, E

Further subgroups are designated by a second, lower case letter which

distinguish specific seasonal characteristics of temperature and

precipitation.

Af, Aw, Bs….

To further denote variations in climate, a

third letter was added to the code.

These letters usually correspond to information about certain months or about max and min temperature or

rainfall.

Abf, Cws, ….

You will not have to memorize all of the letters, but you may have to

use charts to look them up

There are 3 basic climate groups

Group ILow-latitude Climates

Group II

Mid-latitude Climates

Group IIIHigh-latitude climates

Group ILow-latitude Climates:

Tropical Moist Climates (Af) rainforest

Wet-Dry Tropical Climates (Aw) savanna

Dry Tropical Climate (BW) desert biome

Tropical Moist Climates

• Average temperature range around 20o - 30o C • Annual Precipitation: 262 cm. (103 in.)• Latitude Range: 10° S to 25 ° N• Global Position: Amazon Basin; Congo Basin of

equatorial Africa; East Indies, from Sumatra to New Guinea.

Wet-Dry Tropic Climates

• Temperature Range: ~18 °C--25 °C• Annual Precipitation: 0.25 cm. (0.1 in.). All months less

than 0.25 cm. (0.1 in.)• Latitude Range: 15 ° to 25 ° N and S• Global Range: India, Indochina, West Africa, southern

Africa, South America and the north coast of Australia

Dry Tropical Climate (BW)

• Average Annual Temperature (oC) = 22.8 • Annual Precipitation: 0.25 cm (0.1 in). All months less than 0.25

cm (0.1 in).• Latitude Range: 15° - 25° N and S.• Global Range: southwestern United States and northern Mexico;

Argentina; north Africa; south Africa; central part of Australia.

Monsoon Tropical Climate (Am)

Located usually between 10 and 25o N or S of the equator

Average temperature around 26oC

Has high annual rainfall but most of it occurs in the rainy season

Mid-latitude Climates:

• Dry Midlatitude Climates (BS) steppe

• Mediterranean Climate (Cs) chaparral biome

• Dry Midlatitude Climates (Bs) grasslands biome

Dry Midlatitude Climates

• Temperature Range: 24° C (43° F).• Annual Precipitation: less than 10 cm (4 in) in the driest

regions to 50 cm (20 in) in the moister steppes.• Latitude Range: 35° - 55° N.• Global Range: Western North America (Great Basin,

Columbia Plateau, Great Plains); Eurasian interior, from steppes of eastern Europe to the Gobi Desert and North China.

Rain forests are characterized by high rainfall, with definitions setting minimum normal annual rainfall between 1,750 millimetres (69 in) and 2,000 millimetres (79 in).

Mean monthly temperatures exceed 18 °C (64 °F) during all months of the year.

You can imagine that each climactic zone also share some

natural features.

What kind of natural features would these places share to

some degree?