Which one of the following is the characteristic climate of the Tropical Savannah Region?
Contents11
- ARainfall throughout the year
- BRainfall in winter only
- CAn extremely short dry season
- DA definite dry and wet season
Show answer
Answer: (D) A definite dry and wet season
The Tropical Savannah (Aw) climate, also called Sudan type, is characterized by a distinct wet season and a distinct dry season.
During summer (high-sun period), the ITCZ shifts toward these regions bringing rain; during winter (low-sun period), they come under the influence of dry trade winds.
This is different from:
- (a) Equatorial climate — rainfall throughout the year.
- (b) Mediterranean climate — rainfall in winter only.
- (c) Monsoon climate — while it has a short dry season, the savannah's dry season is more prolonged and definite.
Answer: (d) A definite dry and wet season.
Tropical Savannah climate covers vast areas of Africa, South America, and Australia where millions depend on agriculture tied to these distinct wet and dry seasons.
The question tests understanding of how the ITCZ (Intertropical Convergence Zone) movement creates the sharp seasonal contrast that defines savannah climate, unlike the gradual transitions in other tropical climates.
Tropical Savannah Climate
Geography Tropical Savannah Region definite dry and wet season
Tropical Savannah Climate: Characteristics & Mechanism
Tropical Savannah has distinct wet and dry seasons — key identifying feature
Also called Aw climate or Sudan type climate
Wet season when ITCZ shifts toward region (summer)
Dry season when dry trade winds dominate (winter)
The Tropical Savannah climate lies between the equatorial rainforests and hot deserts. Its defining feature is the alternating wet and dry seasons caused by the seasonal movement of the Inter-Tropical Convergence Zone (ITCZ).
Seasonal Pattern
Season | ITCZ Position | Dominant Winds | Rainfall | Characteristics |
|---|---|---|---|---|
Summer (High-sun) | Shifts toward region | Moisture-laden winds | Heavy rainfall | Wet season begins |
Winter (Low-sun) | Shifts away from region | Dry trade winds | Little/no rain | Distinct dry season |
Key Features
Annual rainfall: 500-1500 mm concentrated in wet season
Temperature remains high throughout the year (20-30°C)
Vegetation: Grasslands with scattered trees (savannah)
Dry season can last 3-6 months depending on latitude
Global Distribution
Source: StudyIQ — Savanna Climate, Distribution, Climatic Conditions & Map · www.studyiq.com
Why This Was Tested
UPSC tested the seasonal rainfall pattern — the most diagnostic feature of savannah climate. Option D correctly identifies the definite wet and dry seasons, while other options describe different climate types entirely.
Trap: Confusing savannah's 'distinct dry season' with monsoon's 'short dry season' — savannah dry period is longer
Trap: Thinking 'tropical' means rainfall throughout the year — that's equatorial climate, not savannah
Trap: Mixing up winter rainfall (Mediterranean) with winter dry season (Savannah)
Major World Climate Types
Geography Rainfall throughout the year Rainfall in winter only dry season
World Climate Types: Rainfall Pattern Comparison
Equatorial: Rainfall throughout the year (no dry season)
Mediterranean: Winter rainfall, summer drought
Monsoon: Short dry season, heavy wet season
Savannah: Distinct wet and dry seasons of equal length
Climate Types by Rainfall Pattern
Climate Type | Rainfall Pattern | Dry Season | Cause | Example Regions |
|---|---|---|---|---|
Equatorial (Af) | Throughout the year | None | ITCZ remains overhead | Amazon Basin, Congo Basin |
Mediterranean (Cs) | Winter only | Summer drought | Westerlies in winter, high pressure in summer | Mediterranean region, California |
Monsoon (Am) | Heavy in summer | Short (2-3 months) | Seasonal wind reversal | Western Ghats, Myanmar |
Savannah (Aw) | Summer only | Long (3-6 months) | ITCZ seasonal shift | Sudan, Brazilian Highlands |
Climate Classification
# Tropical Climates
## Equatorial (Af)
- No dry season
- Heavy rainfall year-round
- Dense forests
## Monsoon (Am)
- Short dry season
- Very heavy wet season
- Deciduous forests
## Savannah (Aw)
- Long dry season
- Distinct wet season
- Grasslands with treesTrap: All tropical climates have year-round rain — wrong, only equatorial does
Trap: Mediterranean = tropical climate — wrong, it's temperate with winter rain
Trap: Monsoon and Savannah both have dry seasons — true, but monsoon's is much shorter
Trap: Confusing Köppen symbols: Af (equatorial), Am (monsoon), Aw (savannah)
Inter-Tropical Convergence Zone (ITCZ)
Geography
ITCZ: The Engine of Tropical Rainfall Patterns
ITCZ = belt where trade winds from both hemispheres meet
Shifts seasonally following the sun's overhead position
Brings heavy rainfall where it sits, dry conditions where it leaves
The Inter-Tropical Convergence Zone is a belt of low pressure where Northeast and Southeast trade winds converge. As it shifts seasonally, it creates the wet and dry seasons that define tropical savannah climate.
ITCZ Seasonal Cycle
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**March-May**
ITCZ moves **northward** from equator`"]
s2["`**June-August**
ITCZ reaches **maximum northern** position (around 20°N)`"]
s3["`**September-November**
ITCZ moves **southward** back toward equator`"]
s4["`**December-February**
ITCZ reaches **maximum southern** position (around 20°S)`"]
s1 --> s2
s2 --> s3
s3 --> s4ITCZ Effects
Convergence → air rises → cooling → condensation → heavy rainfall
Seasonal shift creates alternating wet/dry periods in savannah regions
Regions north of ITCZ get dry trade winds from northeast
Regions south of ITCZ get dry trade winds from southeast
Source: Britannica — Intertropical convergence zone (ITCZ) | Definition, Location ... · www.britannica.com