๐ Chapter 3 โ Climates of India
Class 7 ยท India & the World: Land & People ยท Short Notes
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"May the rains be timely, may the Earth be lush with vegetation, may this country be free from turmoil..." โ Subhฤลhita (Ancient Sanskrit saying)
๐ก๏ธ Climate vs Weather
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โ๏ธWeather = day-to-day changes in atmosphere (short-term, changes fast)
๐Climate = average weather of a place over 30+ years โ long-term pattern
๐กIndia has 6 main climatic regions due to its vast size and diverse geography
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๐ง๏ธ The Monsoon โ India's Lifeline
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๐ง๏ธ Southwest Monsoon โ rains that feed India
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๐ง Monsoon brings life โ and sometimes floods
๐Monsoon = seasonal reversal of winds that brings rain to India
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Southwest Monsoon: JuneโSeptember โ comes from Arabian Sea & Bay of Bengal
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Northeast Monsoon: OctoberโDecember โ brings rain to southeast India (Tamil Nadu, Andhra)
๐พAbout 75% of India's annual rainfall comes from the Southwest Monsoon!
๐๏ธMonsoon is crucial for agriculture, rivers, groundwater, and daily life of billions
๐ก How does Monsoon form?
In summer, land heats up faster than sea โ hot air over land rises โ cool moist air from sea rushes in โ brings heavy rainfall! This seasonal switch of wind direction is the MONSOON. ๐ฌ๏ธโ๐ง๏ธ
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Seasons of India
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๐ India's four distinct seasons
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โ๏ธ Hot dry season in the plains
โ๏ธ Cold/Winter
DecโFeb
โCool & dry across most of India
โNW India: cold waves & fog
๐ฅ Hot/Summer
MarโMay
โVery hot, dry weather
โDust storms in north India
๐ง๏ธ Rainy/Monsoon
JunโSep
โHeavy rainfall across India
โSouthwest monsoon winds
๐ Retreating Monsoon
OctโNov
โMonsoon withdraws from north
โSE India gets rains (NE monsoon)
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๐บ๏ธ Climatic Regions of India
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๐ฅ Northeast India โ high rainfall region, rich culture
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๐ฟ Different vegetation in different climatic zones
| Climate Type | Region | Features |
|---|---|---|
| ๐๏ธ Alpine/Mountain | Himalayas, J&K, Ladakh | Very cold, heavy snowfall, thin air |
| ๐ต Arid/Desert | Rajasthan (Thar) | Hot & dry, very little rain (<25cm/year) |
| ๐พ Semi-Arid | Punjab, Haryana, parts of Rajasthan | Low to moderate rainfall, hot summers |
| ๐ฟ Tropical Wet & Dry | Most of peninsular India | Distinct wet & dry seasons, moderate rain |
| ๐ณ Tropical Rainforest | Western Ghats, NE India, Andaman | Very heavy rain, warm all year, dense forests |
| ๐ง Humid Subtropical | Indo-Gangetic Plains | Hot summers, cool winters, moderate rain |
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๐บ๏ธ Different climatic zones across India's landscape
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๐ง Rainfall Distribution in India
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โHighest Rainfall: Mawsynram & Cherrapunji (Meghalaya) โ among the wettest places on Earth!
๐๏ธLowest Rainfall: Jaisalmer, Rajasthan โ less than 10 cm per year
๐Western Ghats: Very heavy rain on windward side, dry on leeward side (Rain Shadow)
๐พMost of India's agriculture depends on the Southwest Monsoon
๐ Remember!
Rain Shadow Area = area on the leeward side of a mountain that receives very little rain because the mountain blocks the moisture-laden winds ๐๏ธ
Mawsynram (Meghalaya) = one of the wettest places on Earth โ receives over 11,000 mm of rain per year! ๐ง๏ธ
Mawsynram (Meghalaya) = one of the wettest places on Earth โ receives over 11,000 mm of rain per year! ๐ง๏ธ
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โญ Quick Summary
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๐ Key Points
๐ก๏ธClimate = 30+ year average of weather | Weather = day-to-day changes
๐ง๏ธMonsoon = seasonal reversal of winds โ 75% of India's rainfall โ June to September
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4 Seasons: Cold (DecโFeb), Hot (MarโMay), Rainy (JunโSep), Retreating (OctโNov)
๐บ๏ธ6 Climatic Zones: Alpine, Arid, Semi-Arid, Tropical Wet-Dry, Rainforest, Humid Subtropical
๐งWettest: Mawsynram/Cherrapunji | Driest: Jaisalmer | Rain Shadow: behind Western Ghats