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Climate - Chapter 4 Geography NCERT class 9

Understanding Weather vs Climate Weather refers to short-term atmospheric conditions, while climate is the long-term average of these conditions. Elements that influence both include temperature, atmospheric pressure, wind, humidity, and precipitation. India experiences a monsoon climate crucial for agriculture due to its reliance on seasonal rainfall patterns. Coastal regions benefit from this but also face risks like floods and tsunamis.

Regional Variations in Temperature and Precipitation Temperature varies significantly across India; Rajasthan can reach extreme highs while Jammu & Kashmir sees snow in winter months. Precipitation includes all forms of moisture such as rain or snow and differs by region—Himalayan areas receive snowfall whereas most other parts get rain during monsoons with annual ranges varying widely between 10 cm to 400 cm.

Key Factors Influencing Climate Climate is influenced by six major controls: latitude affects warmth based on sun exposure; altitude impacts temperature inversely with height; pressure systems dictate weather changes through high/low zones; ocean currents bring humidity affecting coastal climates; relief features create barriers influencing local temperatures.

The Mechanism Behind Indian Monsoons Monsoon winds are vital for India's climate shaped over centuries by historical trade routes linking sailors' observations about seasonal rains. The mechanisms behind the Indian Monsoon involve differential heating between land/water creating low-pressure zones attracting moist air from oceans leading to significant rainfall primarily experienced during summer months starting around June until mid-September.

'Onset' And 'Withdrawal': Seasonal Transitions 'Withdrawal' describes how post-monsoon seasons transition into colder periods beginning September when northern states cool down rapidly due to Earth's tilt away from sunlight causing cold Arctic winds southward movement resulting in dry spells after heavy rains earlier in the year which leads some southern regions experiencing late showers even till December