Climate Types of India

Subject: Geography | Unit: Climate & Weather | Topic: Climate Types Exam: AP Group 2 (APPSC)

Introduction

Despite being unified by the monsoon, India exhibits an extraordinary range of climatic conditions — from 50 deg C in Rajasthan to -45 deg C in Ladakh, from >11,000 mm rainfall in Mawsynram to <100 mm in Leh. The Koppen classification system, which links climate to vegetation, is the most commonly used framework for India's climate zones. Understanding which Koppen type covers which region is a frequent exam topic.

Context

The Tropic of Cancer (23.5 deg N) divides India into tropical (south) and subtropical (north) zones. Climate is controlled by latitude, altitude, pressure systems, distance from sea, ocean currents, and relief. Koppen's system uses temperature and precipitation to classify climates into major groups (A through E) with subtypes.

Core Content

Koppen Classification Symbols

Koppen Climate Types Found in India

Temperature Patterns

Winter (January): Wide variation — Thiruvananthapuram 27 deg C, Leh -14 deg C; Himalayas block cold Central Asian winds.

Summer (May-June): Relatively uniform across peninsula; NW India hottest (45-50 deg C, Loo winds); hills cooler (lapse rate ~6.5 deg C per 1,000 m).

Rainfall Distribution

Special Climatic Phenomena

AP Connection

• AP falls primarily under Aw (Tropical Wet and Dry/Savanna) climate
• Coastal AP also receives Am (monsoon) influence with both SW and NE monsoon
• Rayalaseema: semi-arid, BSh characteristics; lowest rainfall in AP
• Anantapur district: One of India's most drought-prone (~550 mm annual rainfall)
• Araku Valley: Cwb (subtropical highland) microclimate — coffee growing
• AP temperature range: Summer 35-45 deg C; Winter 15-25 deg C
• Coastal AP mean annual rainfall: 1,000-1,200 mm; Rayalaseema: 550-750 mm

Key Points Summary

1. Koppen classification uses letters: A (tropical), B (dry), C (temperate), D (cold), E (polar)
2. Aw (Tropical Savanna) covers most of peninsular India — largest climate zone by area
3. Cwa (Humid Subtropical) covers the Northern Plains — most populated zone
4. BWh = Thar Desert; BSh = semi-arid steppe (transition zone)
5. Am = tropical monsoon — western coast south of Goa
6. India's temperature range: 50 deg C (Rajasthan) to -45 deg C (Ladakh)
7. Mawsynram > Cherrapunji for highest rainfall globally
8. Loo = hot summer winds in northern plains; Kalbaisakhi = NE thunderstorms
9. Lapse rate: temperature drops ~6.5 deg C per 1,000 m altitude
10. Tropic of Cancer divides India into tropical (south) and subtropical (north)
11. Himalayas block cold Central Asian winds — keeping Indian winters milder
12. AP is primarily Aw climate; Rayalaseema has BSh characteristics
13. Hill stations (Shimla, Darjeeling, Shillong) are Cwb — subtropical highland
14. October Heat = oppressive post-monsoon period with high temp and humidity
15. Mango Showers = pre-monsoon rain in Kerala/Karnataka helping fruit ripening

Exam Strategy

• Koppen symbol matching is a staple: Am = monsoon coast, Aw = peninsula, Cwa = Ganga plain, BWh = Thar
• Area vs population: Aw covers MOST AREA; Cwa covers MOST POPULATED region
• AP climate: Aw for most of AP; BSh for Rayalaseema; Cwb for Araku
• Trick: BSh (semi-arid) is DIFFERENT from BWh (desert) — know where each applies
• Special phenomena: Match Loo = NW India summer, Kalbaisakhi = Bengal/NE April-May

Key Terms Glossary