भारत की जलवायु - The Monsoon Civilisation
From the scorching Thar Desert to the rain-soaked Cherrapunji, from the frozen peaks of the Himalayas to the tropical shores of Kerala - India's climate diversity is unparalleled in the world.
"भारत की जलवायु विविधता - विश्व की प्राकृतिक प्रयोगशाला"
India's climate is primarily controlled by the monsoon system, making it unique among world climate systems. The seasonal reversal of winds brings 75-90% of annual rainfall during June-September.
Tropic of Cancer (23°30'N) passes through the middle of India, dividing it into tropical and subtropical zones. This position gives India both tropical and temperate climate characteristics.
The Himalayas act as a climatic barrier, blocking cold Central Asian winds and trapping monsoon clouds, creating distinct microclimates from sea level to 8000+ meters.
Based on Köppen Climate Classification & IMD Data
उष्णकटिबंधीय आर्द्र जलवायु
उष्णकटिबंधीय शुष्क जलवायु
उपोष्णकटिबंधीय आर्द्र जलवायु
पर्वतीय जलवायु
शुष्क मरुस्थलीय जलवायु
अर्ध-शुष्क जलवायु
मानसून - भारत की जीवन रेखा | The Lifeline of Bharat's Agriculture and Economy
The word "Monsoon" comes from Arabic "mausim" (موسم) meaning season. It refers to the seasonal reversal of wind direction that brings distinct wet and dry seasons to India. This phenomenon is caused by differential heating of land and ocean, creating pressure differences that drive wind patterns.
Arabian Sea Branch:
✦ Strikes Western Ghats, causing heavy rainfall (2,000-8,000 mm)
✦ Divides: One part goes to Maharashtra, Gujarat; other to Karnataka, Kerala
✦ Creates rain shadow in Deccan interior
Bay of Bengal Branch:
✦ More powerful branch
✦ Strikes Northeast India, causing extreme rainfall (Cherrapunji: 11,777 mm)
✦ Travels through Ganga plains, bringing 80-90% of their annual rainfall
✦ Reaches Punjab, Haryana after deflection from Himalayas
Provides 75-90% of annual rainfall for most of India. Critical for Kharif crops (rice, cotton, maize, pulses).
Also called the "Winter Monsoon" or "Retreating Monsoon." As the Southwest Monsoon withdraws, winds reverse direction. Cold dry winds from land move towards the warming Bay of Bengal, picking up moisture over the Bay and bringing rainfall to the southeast coast.
This season is notorious for tropical cyclones in the Bay of Bengal and Arabian Sea. Cyclones like "Vardah," "Gaja," "Thane," and "Hudhud" have struck during this period, bringing intense rainfall and winds to Tamil Nadu and Andhra Pradesh coasts.
Critical for Tamil Nadu's agriculture. Enables cultivation of rice, pulses, and oilseeds during Rabi season. Chennai, Coimbatore, and Madurai depend heavily on these rains for water supply.
Excessive rainfall causes devastating floods in Assam, Bihar, UP, and Kerala almost every year.
Delayed or deficient monsoons lead to droughts in Maharashtra, Karnataka, Rajasthan, and MP.
Periods of no rain lasting 10-15 days during monsoon season, affecting agriculture.
Pacific Ocean phenomena significantly impact monsoon strength and distribution.
षड् ऋतु - Ancient Indian Classification Based on Astronomy & Agriculture
Ancient Indian texts like the Vedas and Puranas describe six seasons (षड् ऋतु) based on solar calendar and agricultural cycles. Modern meteorology recognizes four main seasons for practical purposes. Here we present both perspectives.
25-50°C across different regions
25-35°C (moderated by cloud cover and rain)
20-32°C (pleasant temperatures)
-45°C (Dras, Ladakh) to 25°C (South India)
15-30°C (pleasant, gradually warming)
| Season | Sanskrit Name | Months | Solar Months | Key Features |
|---|---|---|---|---|
| Spring | वसंत (Vasanta) | Mid-March to Mid-May | Chaitra, Vaishakha | Flowering, moderate temperature, beginning of heat |
| Summer | ग्रीष्म (Grishma) | Mid-May to Mid-July | Jyeshtha, Ashadha | Intense heat, dry winds, monsoon onset |
| Monsoon | वर्षा (Varsha) | Mid-July to Mid-September | Shravana, Bhadrapada | Heavy rainfall, lush greenery, agricultural sowing |
| Autumn | शरद् (Sharad) | Mid-September to Mid-November | Ashvina, Kartika | Clear skies, festivals, crop harvesting |
| Pre-Winter | हेमंत (Hemanta) | Mid-November to Mid-January | Margashirsha, Pausha | Beginning of cold, dew formation, early winter crops |
| Winter | शिशिर (Shishira) | Mid-January to Mid-March | Magha, Phalguna | Peak cold, fog, frost in North, snowfall in mountains |
वर्षा वितरण - From 11,872 mm (Mawsynram) to 150 mm (Jaisalmer)
Interactive map showing annual average rainfall across India's regions, highlighting extreme variation from wettest to driest areas.
> 3,000 mm
Western Ghats, Meghalaya
2,000 - 3,000 mm
Assam, West Bengal
1,000 - 2,000 mm
Northern Plains, Odisha
600 - 1,000 mm
Central India
400 - 600 mm
Semi-arid regions
< 400 mm
Thar Desert, Ladakh
| Rank | State/UT | Annual Rainfall (mm) | Category | Primary Source |
|---|---|---|---|---|
| 1 | 🌧️ Meghalaya | 11,619 mm | Extremely Heavy | Southwest Monsoon (Bay of Bengal branch) |
| 2 | 🌊 Arunachal Pradesh | 2,782 mm | Very Heavy | Southwest Monsoon |
| 3 | 🌴 Goa | 2,984 mm | Very Heavy | Southwest Monsoon (Western Ghats) |
| 4 | 🏝️ Andaman & Nicobar | 3,180 mm | Very Heavy | Both monsoons + convectional |
| 5 | 🌿 Sikkim | 2,203 mm | Heavy | Southwest Monsoon |
| 6 | ☔ Assam | 2,818 mm | Very Heavy | Southwest Monsoon |
| 7 | 🌲 Kerala | 2,914 mm | Very Heavy | Both monsoons |
| 8 | 🌺 Karnataka (Coastal) | 2,441 mm | Heavy | Southwest Monsoon |
| 9 | 🏞️ Mizoram | 2,593 mm | Very Heavy | Southwest Monsoon |
| 10 | 🌄 Nagaland | 1,966 mm | Heavy | Southwest Monsoon |
| 28 | 🏜️ Rajasthan | 575 mm | Low | Southwest Monsoon (weak) |
| 29 | ❄️ Ladakh | 117 mm | Scanty | Western disturbances (snow) |
Mawsynram, Meghalaya
11,872 mm annual average
Located on windward side of Khasi Hills, receives orographic rainfall from Bay of Bengal monsoon.
Cherrapunji, Meghalaya
11,777 mm annual average
Holds record for highest rainfall in a calendar month (2,930 mm in July 1861) and year (26,471 mm in 1861).
Jaisalmer, Rajasthan
150-210 mm annual average
Located in the heart of Thar Desert, receives minimal monsoon rainfall.
Mumbai, Maharashtra
944 mm on July 26, 2005
Led to catastrophic floods; one of India's worst urban flood disasters.
Agumbe, Karnataka
7,620 mm (monsoon season)
Known as "Cherrapunji of South India", receives intense Western Ghats orographic rainfall.
Leh-Ladakh
100-117 mm annual (mostly snow)
Rain shadow of Himalayas; receives moisture from Western disturbances as snowfall.
तापमान वितरण - From -45°C in Dras to 51°C in Phalodi
* Average temperatures for Central India. Actual temperatures vary significantly by region.
| Zone | Regions | Summer (Max) | Winter (Min) | Annual Range |
|---|---|---|---|---|
| 🔥 Hot Desert | Thar Desert (Rajasthan, Gujarat) | 45-50°C | 5-10°C | 40-45°C |
| ☀️ Tropical Hot | Central & North India plains | 40-48°C | 10-15°C | 30-35°C |
| 🌴 Tropical Humid | Western Ghats, Coastal areas | 30-35°C | 20-25°C | 10-15°C |
| 🌤️ Subtropical | Northern Plains | 38-45°C | 5-12°C | 30-38°C |
| 🏔️ Alpine Cool | Himalayas (2,000-3,500m) | 15-25°C | -5 to 5°C | 20-30°C |
| ❄️ Alpine Cold | High Himalayas (3,500-5,000m) | 5-15°C | -15 to -5°C | 20-30°C |
| 🧊 Glacial | Peaks above 5,000m | -5 to 5°C | -30 to -20°C | 25-35°C |
| 🌊 Maritime Moderate | Coastal Tamil Nadu, Kerala, Goa | 28-34°C | 20-24°C | 8-12°C |
चरम मौसम रिकॉर्ड - India's Climate Extremes
Location: Phalodi, Rajasthan
Date: May 19, 2016
Context: Severe heat wave across Northwest India. Previous record was 50.6°C in Alwar (1956).
Other Hot Spots:
Location: Dras, Ladakh
Season: Winter (December-February)
Context: Dras is the second-coldest inhabited place on Earth after Siberia. Average winter temperature: -22°C.
Other Cold Spots:
Location: Mawsynram, Meghalaya
Average: Based on 1974-2022 data
Context: Orographic rainfall from Bay of Bengal monsoon hitting Khasi Hills.
Record Year:
Cherrapunji received 26,471 mm in 1861 - highest annual rainfall ever recorded on Earth.
Location: Leh-Ladakh
Type: Cold desert (most precipitation as snow)
Context: Rain shadow region behind Himalayas, receives minimal monsoon influence.
Other Dry Regions:
Frequency: 5-6 per year on average
Peak Season: May-June, October-November
Regions Affected: Odisha, Andhra Pradesh, Tamil Nadu, West Bengal, Gujarat
Deadliest: Bhola Cyclone (1970) killed 500,000+ in Bangladesh and West Bengal
Recent: Cyclone Fani (2019), Amphan (2020), Tauktae (2021)
Annual Occurrence: Monsoon season (June-September)
Most Affected: Assam, Bihar, UP, Kerala, Uttarakhand
Notable Events:
Season: April-June
Regions: Rajasthan, Gujarat, MP, Vidarbha, Telangana, AP
Definition: Temperature >45°C in plains, >37°C in hills
Impact: Heat stroke deaths, crop damage, water scarcity
Deadliest: 2015 heat wave killed 2,500+ people
Frequency: Every 2-3 years in some regions
Prone Areas: Marathwada, Bundelkhand, Vidarbha, Rayalaseema
Cause: Deficient monsoon rainfall (<75% of normal)
Recent Severe: 2016-17 affected Maharashtra, Karnataka, Tamil Nadu
Impact: Crop failure, migration, farmer distress
Season: Monsoon months (July-September)
Regions: Western Ghats, Himalayas, Northeast hills
Major Events:
Regions: J&K, Himachal, Uttarakhand, Sikkim
Season: December-February
Record: Gulmarg receives 5-10 meters of snow annually
Impact: Road blockades (Zoji La, Rohtang Pass), avalanches, isolation of villages
जलवायु परिवर्तन का प्रभाव - How India's Climate is Changing & What It Means
• Glacial melt affecting river flows
• Groundwater depletion accelerating
• Increased flood-drought cycles
• Wetland and lake shrinkage
• Crop yield variability increasing
• Shifting of agro-climatic zones
• Pest and disease pattern changes
• Water stress for rain-fed agriculture
• Coral bleaching (Andaman, Lakshadweep)
• Alpine species habitat loss
• Migration of species to higher altitudes
• Mangrove ecosystem stress
• Heat island effect intensifying
• Coastal cities facing inundation risk
• Air quality deterioration
• Infrastructure stress from extreme events
• Glacial lake outburst floods risk
• Snowline shifting upwards
• Landslide frequency increasing
• Ecosystem disruption
• 7,500+ km coastline at risk
• Saltwater intrusion in aquifers
• Cyclone intensity increasing
• Erosion of beaches and islands
Target: 500 GW by 2030 (Currently ~170 GW). World's 4th largest renewable energy capacity.
33% forest cover target. Green India Mission: 5 million hectares restoration.
Jal Jeevan Mission, watershed management, rainwater harvesting programs.
Metro expansion, EV adoption, railway electrification (100% target).
Complete overview of India's physical features
All mountain ranges from Himalayas to Sahyadri
Complete drainage system of India
8 major soil types of India explained
Biodiversity & wildlife of India
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