Climate
CBSE · Class 11 · Geography
Quick revision notes for Climate — CBSE Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
1. Nature of Climate and Weather
- Weather is the momentary state of the atmosphere.
- Climate is the average of weather conditions over a longer period of time.
- Weather can change within a day or a week, while climate changes slowly and is noted over long periods.
2. Factors Controlling the Climate of India
- India's climate is controlled by latitude, the Himalayan Mountains, distribution of land and water, distance from the sea, altitude, and relief.
- The Tropic of Cancer passes through the central part of India, dividing it into a northern sub-tropical and temperate zone and a southern tropical zone.
- The Himalayan Mountains block cold winds from the north and trap monsoon winds, forcing them to release moisture.
3. Regional Variations in Temperature and Rainfall
- India shows very large regional and seasonal variation in temperature.
- In summer, western Rajasthan may touch 55 degree Celsius, while in winter around Leh temperature may fall to minus 45 degree Celsius.
- Agra and Darjiling lie on the same latitude, but January temperature is much lower in Darjiling because of altitude.
4. Inter Tropical Convergence Zone and Monsoon Onset
- The Inter Tropical Convergence Zone is a low pressure zone at the equator where trade winds converge and air rises.
- In July, the ITCZ shifts to around 20 degree N to 25 degree N over the Gangetic plain and is called the monsoon trough.
- The northward shift of the ITCZ helps the southeast trades cross the Equator and become southwest monsoon winds.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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