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Koeppen Classification of Climate Class 11 Geography

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GeographyCBSE Class 11 · World Climate and Climate Change

Koeppen's Scheme of Classification of World Climates (Class 11 Geography, Fundamentals of Physical Geography, Chapter 11)

Updated 17 October 2026 · Fact-checked

Koeppen's empirical scheme (1918) classes world climate into five groups using temperature and precipitation thresholds tied to vegetation: A tropical (coldest month 18 degrees C or more), B dry (potential evaporation exceeds precipitation), C warm temperate, D cold snow forest and E cold (all months below 10 degrees C). Small letters give seasonality and temperature severity.

A, C and D are sorted by the coldest month's temperature, E by all months below 10°C, while B depends on rainfall versus evaporation.

Illustration drawn for QuestionBuddy.

Understand Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups

Why this topic matters. CBSE assesses this chapter only through project and presentation, so understanding Koeppen's logic (thresholds, letters, regions) is what a project needs.

1. Approaches. Climate can be classified by an empirical approach (observed data, especially temperature and precipitation), a genetic approach (causes of climates) or an applied approach (for a specific purpose).

2. Koeppen's scheme. The most widely used empirical scheme, developed by V. Koeppen in 1918 and modified later. He found a close relationship between vegetation and climate and chose threshold values of temperature and precipitation that match vegetation boundaries, using mean annual and mean monthly values. Capital letters mark groups and small letters mark types.

3. Five groups. A Tropical: coldest month average 18 degrees C or higher. B Dry: potential evaporation exceeds precipitation. C Warm temperate: coldest month above minus 3 but below 18 degrees C. D Cold snow forest: coldest month minus 3 degrees C or below. E Cold: average of all months below 10 degrees C. Four groups rest on temperature and one (B) on precipitation; A, C, D and E are humid and B is dry.

4. Letter codes. f no dry season; m monsoon; w winter dry; s summer dry; a, b, c, d severity of temperature; S steppe and W desert for B; h low-latitude and k mid-latitude.

5. Tropical (A). Af tropical wet (Amazon Basin, western equatorial Africa, East Indies): rain every month, tropical evergreen forest. Am tropical monsoon (Indian subcontinent, north-eastern South America, northern Australia): heavy summer rain, dry winter. Aw tropical wet and dry: shorter wet season, deciduous forests and tree-shredded grasslands.

6. Dry (B). Between 15 and 60 degrees N and S: in the subtropical high (15-30 degrees) where subsidence prevents rain, and in continental interiors (35-60 degrees). Types: BSh, BWh, BSk, BWk. Steppe gets slightly more rain; deserts have short intense showers, fog in coastal deserts with cold currents, and large annual and daily ranges.

7. Warm temperate (C). Cwa (humid subtropical, dry winter, such as the north Indian plains), Cs (Mediterranean: hot dry summer, mild rainy winter), Cfa (humid subtropical, no dry season, eastern margins) and Cfb (marine west coast: rain all year, moderate temperature).

8. Cold snow forest (D) and polar (E). D lies at 40-70 degrees N with cold snowy winters and a large annual range (Df humid winter, Dw dry winter). E lies beyond 70 degrees: ET tundra (mosses, lichens, permafrost) and EF ice cap (interior Greenland and Antarctica, below freezing even in summer).

Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups: key facts

Koeppen groups
  • A: coldest month 18 degrees C or more
  • B: potential evaporation exceeds precipitation
  • C: coldest month above minus 3 and below 18
  • D: coldest month minus 3 or below
  • E: all months below 10
Capital letters.
Small letters
  • f no dry season
  • m monsoon
  • w winter dry
  • s summer dry
  • S steppe, W desert
  • h low latitude, k mid-latitude
Types.
A types
Aftropical wet
Amtropical monsoon
Awwet and dry
Tropical group.
C and E types
  • Cwa
  • Cs Mediterranean
  • Cfa
  • Cfb marine west coast
  • ET tundra
  • EF ice cap
Temperate and polar.

How to answer Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups questions

Classification of a place uses thresholds in order.

  1. 1Check the coldest month temperature against 18 degrees C (A).
  2. 2Check dryness (B) from evaporation and rainfall.
  3. 3Check the C, D or E temperature thresholds.
  4. 4Add the small letter from rainfall season and then name the type.

Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Climate report

Suppose a station records a coldest-month average of 22 degrees C and rain in every month.

Which Koeppen group and type is it?

Try it first, then show the solutionSolution
  1. Coldest month 18 degrees C or more is group A.
  2. Rain all year gives f.

Answer: Af, a tropical wet climate.

Memory hook: Hot all year, wet all year.

Mild winter city

Suppose a city has a coldest-month average of 5 degrees C, a warm summer and rain in all months.

Which group is it?

Try it first, then show the solutionSolution
  1. Coldest month is above minus 3 and below 18 degrees C.
  2. That is group C.

Answer: Group C (warm temperate), probably Cf.

Memory hook: Cool but not freezing.

Tricks to remember Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups

Short memory aids. Say each one aloud once, then use it on a question the same day.

  • ABCDE

    Tropical, Dry, warm temperate (C), cold snow forest (D), cold (E)

    Use it when: Five groups.

  • 18, minus 3, 10

    Thresholds for A, C/D, and E

    Use it when: Numbers.

  • f m w s

    No dry season, monsoon, winter dry, summer dry

    Use it when: Letters.

Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Koeppen group A · 1 mark · MCQBoard level

In Koeppen's scheme, a tropical humid climate has the coldest month at:
(A) below minus 3 degrees C
(B) below 10 degrees C
(C) 18 degrees C or higher
(D) above 30 degrees C only

Try it first, then show the solutionSolution
  1. Group A has the coldest month at 18 degrees C or higher (1 mark).

Answer: (C)

Example 2: Letter codes · 2 marks · Very short answerBoard level

What do the letters f, w and s indicate in Koeppen's codes? (2 marks)

Try it first, then show the solutionSolution
  1. f: no dry season (1 mark).
  2. w: winter dry; s: summer dry (1 mark).

Answer: f indicates no dry season, w a dry winter and s a dry summer.

Example 3: Classify the stations · 3 marks · Short answerHarder board level

Classify by group (A, C, D or E): (i) coldest month 24 degrees C, (ii) coldest month minus 10 degrees C, (iii) coldest month 6 degrees C, (iv) all months below 10 degrees C. (3 marks)

Try it first, then show the solutionSolution
  1. (i) 24 is at least 18: A (1 mark).
  2. (ii) minus 10 is below minus 3: D; (iii) 6 is between minus 3 and 18: C (1 mark).
  3. (iv) All months below 10: E (1 mark).

Answer: (i) A, since the coldest month is above 18 degrees C. (ii) D, since the coldest month is below minus 3 degrees C. (iii) C, since 6 is above minus 3 and below 18. (iv) E, since all months are below 10 degrees C.

Example 4: Assertion and reason: Marine west coast climate (Cfb) · 1 mark · Assertion-reasonHarder board level

Assertion (A): The marine west coast (Cfb) climate has rain in all months and moderate temperatures.
Reason (R): It lies on west coasts poleward of the Mediterranean zone, open to maritime air all year.
(A) Both true, R explains A
(B) Both true, R does not explain A
(C) A true, R false
(D) A false, R true

Try it first, then show the solutionSolution
  1. Maritime influence on the west coast explains year-round rain and moderate temperature (1 mark).

Answer: (A)

Example 5: HOTS: monsoon or wet · 5 marks · Long answerHOTS / competency

A station in the Indian subcontinent has heavy summer rain, a dry winter and a coldest month near 20 degrees C. Another near the Amazon has rain in every month. Classify both, explain how the letters m and f arise, and say why the Af climate has negligible annual range. (5 marks)

Try it first, then show the solutionSolution
  1. Coldest month 20 degrees C means group A for both (1 mark).
  2. Indian station: Am tropical monsoon (heavy summer rain, dry winter) (1 mark).
  3. Amazon: Af, no dry season (1 mark).
  4. Letters: m for monsoon, f for no dry season (1 mark).
  5. Af lies near the equator with overhead sun and ITCZ, so it is hot and wet with negligible annual range (1 mark).

Answer: Both have a coldest month above 18 degrees C, so both are group A. The Indian-subcontinent station with heavy summer rain and a dry winter is Am (tropical monsoon, letter m). The Amazon station with rain in every month is Af (f means no dry season). Af lies near the equator where the overhead sun and the ITCZ make it hot and humid all year, so the annual temperature range is negligible.

Where students lose marks in Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups

The slips examiners see most often, and what to write instead.

  • Mistake: Using 18 degrees C for group C

    Threshold confused.

    Wrong working

    C: coldest month 18 degrees C or more.

    Right working

    C: above minus 3 and below 18; 18 or more is A.

    Do this: Learn A first.

    Usually costs: 1 mark.

  • Mistake: Calling B a temperature group

    Four groups use temperature.

    Wrong working

    B is defined by low temperature.

    Right working

    B is defined by precipitation: potential evaporation exceeds it.

    Do this: B is for Bone-dry.

    Usually costs: 1 mark.

  • Mistake: Mixing Af and Am

    Both tropical.

    Wrong working

    Af has a dry winter.

    Right working

    Af: no dry season; Am: monsoon with a dry winter.

    Do this: Use the letters f and m.

    Usually costs: 1 mark.

Exam tips

  • Write the thresholds in a small table: A, B, C, D, E.
  • Match each type to a region and a vegetation.
  • Mention that Koeppen related climate to vegetation.

Practice questions on Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

  1. Q1 · 1 mark · MCQBoard level

    The year in which Koeppen first proposed his scheme is:
    (A) 1818
    (B) 1918
    (C) 1948
    (D) 1988

    Hint

    Early 20th century.

    Answer

    (B)

  2. Q2 · 2 marks · Very short answerBoard level

    Which Koeppen group is based on precipitation rather than temperature? (2 marks)

    Hint

    Dry.

    Answer

    Group B, the dry climates, where potential evaporation exceeds precipitation.

  3. Q3 · 3 marks · Short answerHarder board level

    Describe the Mediterranean (Cs) climate. (3 marks)

    Hint

    Summer high, winter westerlies.

    Answer

    The Cs climate occurs around the Mediterranean Sea and on west coasts at 30 to 40 degrees (central California, central Chile, parts of Australia). The subtropical high in summer gives hot dry summers and the westerlies in winter give mild rainy winters; summer is about 25 degrees C and winter below 10 degrees C.

  4. Q4 · 3 marks · Short answerHarder board level

    Distinguish steppe (S) from desert (W) climates. (3 marks)

    Hint

    Rainfall.

    Answer

    Steppe gets slightly more rain and supports sparse grassland, but its rainfall is highly variable, so droughts hit it hard. Deserts are drier, with short intense showers that are ineffective for soil moisture, high annual and daily ranges and fog on coasts with cold currents.

  5. Q5 · 4 marks · Short answerHOTS / competency

    A student wrongly classes a station with all months below 10 degrees C and a coldest month of minus 25 degrees C as group D. Evaluate, and give the correct group and the two sub-types of that group. (4 marks)

    Hint

    All months below 10.

    Answer

    The station has every month below 10 degrees C, which is the defining condition of group E, not D; D requires a coldest month of minus 3 degrees C or below with warmer summer months. The correct group is E. Its types are ET (tundra) and EF (ice cap).

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

  1. 1.Who proposed the scheme?Show answer

    V. Koeppen.

  2. 2.Which group is dry?Show answer

    B.

  3. 3.Where is the tundra?Show answer

    Beyond 70 degrees; mosses and lichens.

  4. 4.What does W mean?Show answer

    Desert.

Koeppen's Scheme: Classifying the Climates of the World into A, B, C, D and E Groups: frequently asked questions

Is this chapter in the theory paper?

No; it is assessed by project and presentation.

Why is the group D only in the northern hemisphere?

The chapter places it at 40 to 70 degrees N in Europe, Asia and North America.

What is permafrost?

Permanently frozen ground in tundra regions.