Climates of India — Weather, Seasons & Determining Factors

NCERT Exploring Society: India and Beyond | Chapter 3: Climates of India

Weather, Seasons and Climate

India is celebrated for its incredible diversity, and this extends to its climate patterns as well. Before exploring the different types of climates found across India, it is important to understand three closely related but distinct concepts: weather, seasons, and climate.

Seasons^? serve as the connecting link between weather and climate. They recur every year as the Earth revolves around the Sun, and each season brings its own characteristic weather patterns. Most parts of the world recognise four main seasons — spring, summer, autumn, and winter. However, India also experiences a distinct rainy season (the monsoon), making its seasonal cycle more complex.

All living things — people, plants, and animals — are attuned to these seasonal rhythms. The crops we grow, the food we eat, and the clothes we wear change with the seasons. Certain trees bloom in spring, others shed their leaves as autumn approaches, and some animals grow thicker fur to cope with cold winters.

To summarise this important distinction: weather is what we experience from day to day; seasons recur every year with their characteristic weather patterns; and climate is the long-term pattern of weather in a particular region over decades.

Types of Climates in India

India's vast geography and varied topography produce a remarkable range of climatic conditions. Let us survey the major climate types found across the country:

Factors Determining the Climate

What causes such diverse climatic conditions across India? Several factors work together, some operating on a planetary scale and others at regional or local levels. Let us examine each one.

a) Latitude

The distance of a place from the Equator^? greatly influences its temperature. Places near the Equator (low latitudes) receive the Sun's rays almost perpendicularly, concentrating solar energy on a smaller area and making them warmer. Near the poles (high latitudes), the Sun's rays arrive at an oblique angle, spreading their energy over a larger area and also passing through more atmosphere, which further reduces the heat received.

We can observe this in India: Kanniyakumari and the Nicobar Islands, being close to the Equator, remain warm or hot almost throughout the year, whereas Srinagar in the north is much cooler.

b) Altitude

Hill stations like Shimla, Ooty (Udhagamandalam), Darjeeling, Munnar, and Nainital are popular precisely because they enjoy cooler temperatures than the plains below. This happens for two reasons: first, atmospheric pressure and air density decrease with increasing altitude, and less dense air is cooler; second, the Sun heats the Earth's surface, so the farther away from the surface, the cooler the air becomes. The Himalayas are so high that many peaks stay below freezing point, keeping them perpetually snow-covered.

c) Proximity to the Sea

Coastal areas tend to have a more moderate or temperate^? climate because the sea acts as a temperature moderator. The ocean absorbs and releases heat much more slowly than land. As a result, summers are not too hot and winters are not too cold near the coast. As you move inland, temperatures become more extreme.

d) Winds

Wind patterns play a significant role in shaping the climate of a region. States like Punjab, Haryana, Rajasthan, and Madhya Pradesh often receive winds from the west that have travelled across the deserts of Arabia and Afghanistan, bringing dry and hot air that causes severe heat waves^? in summer. During winter, cold winds from beyond the Himalayas creep into the foothills, producing cold waves.

Winds also affect humidity and precipitation. While dry winds from distant deserts bring scorching conditions, winds arriving from the sea carry moisture that may condense over the land and produce rainfall. The monsoon winds are the most significant example of this phenomenon in India.

e) Topography

The physical landscape of a region — its mountains, valleys, plateaus, and coasts — also shapes its climate. The Himalayan and Karakoram ranges act as a protective barrier, shielding the Indian subcontinent from the frigid winds of Central Asia's cold deserts. In contrast, the flat terrain of the Thar Desert offers no protection from hot, dry winds. The Western Ghats play a crucial role in the southwest monsoon, as we shall explore in the next part.

Microclimates — Small-Scale Climate Variations

A microclimate^? is a localised climate in a small area that differs from the surrounding region. Enclosed valleys and dense forests can develop their own unique temperature and humidity patterns. Cities with large numbers of concrete buildings and little vegetation can trap heat, creating what are known as “urban heat islands” — places that are significantly warmer than surrounding areas. Microclimates influence the local plant and animal life, the crops grown in that area, and even human health and well-being.