Key Points

Weather is the short-term, day-to-day condition of the atmosphere, like rain or sun. Climate is the long-term pattern of weather in a region, averaged over several decades.

A region's climate is determined by several factors, including its latitude, altitude, proximity to the sea, prevailing winds, and topography.

Places at low latitudes near the Equator are hotter because they receive direct sunlight. Places at high latitudes near the poles are colder due to the slanted angle of the sun's rays.

Temperature decreases as altitude increases. This is why mountainous areas and hill stations are cooler than the plains below them.

Coastal areas have moderate climates with less temperature variation because the sea heats up and cools down slower than land. Inland areas experience more extreme temperatures.

India has a wide range of climates, including Alpine in the Himalayas, Arid in the Thar Desert, Tropical Wet on the western coast, and Subtropical in the northern plains.

Monsoons are seasonal winds caused by the differential heating of land and sea. They are vital for India's agriculture and water supply.

In summer, the land heats up, creating a low-pressure zone that draws in moist winds from the ocean. These winds bring heavy rainfall across most of India from June to September.

In winter, the land is cooler than the ocean, creating a high-pressure zone. This causes dry winds to blow from the land to the sea, though some bring rain to the southeastern coast.

Climate deeply influences Indian life. Many festivals like Baisakhi and Onam are linked to seasons and harvests, and the economy, especially agriculture, is heavily dependent on the monsoon.

Cyclones are intense rotating storms with high-speed winds that form over warm ocean waters. They have a calm center called the 'eye' and can cause severe damage to coastal areas.

Floods occur when water overflows onto dry land, caused by heavy rain or overflowing rivers. Landslides are the sudden collapse of rock and soil, often triggered by heavy rains in hilly regions.

Climate change refers to significant, long-term shifts in global temperature and weather patterns. It is now primarily driven by human activities that release greenhouse gases.

Burning fossil fuels releases excess greenhouse gases like carbon dioxide ($\text{CO}_2$) into the atmosphere. These gases trap more heat from the sun, causing global warming.