Climate | Social Science (Geography) Grade 9 CBSE

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The language of climate

Climate has its own vocabulary. Tap each term to see what it means and how the ideas fit together to explain India's weather and seasons.

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The three big ideas

Weather — the day-to-day state of the atmosphere at a place: its temperature, rain, wind and humidity. It can change within hours.
Climate — the average weather of a large area taken over a long period (many years). It changes only very slowly.
Climatic controls — the main factors that shape a place's climate: latitude (distance from the equator), altitude (height above sea level), distance from the sea (continentality) and relief — the mountains and highlands. (NCERT also lists pressure & winds and ocean currents.)
Higher latitude or higher altitude → cooler; places near the sea have a milder, more even climate than places deep inland.

Common mistake: weather can change within hours, but climate is the long-term pattern. One unusually cold day does not change a region's climate — climate is about the average over many years.

The word monsoon comes from the Arabic mausim, meaning season. The monsoon is the seasonal reversal of winds — the wind direction changes between the wet and the dry parts of the year.
Arrival (onset): the south-west monsoon reaches India around early June and blows from June to September, bringing most of India's rain.
Withdrawal (retreat): the monsoon withdraws gradually from about September onwards; the retreating monsoon gives October–November.
Why it matters: the monsoon waters the fields, fills the rivers and reservoirs, and ties the country together — its timing decides the whole farming year.

India has four main seasons: the cold weather (winter) season, the hot weather (summer) season, the rainy (advancing monsoon) season, and the retreating monsoon season.
Rainfall is very uneven: it is very high in the north-east and along the Western Ghats, and very low in the western desert (Rajasthan) and parts of the interior.
Rainfall is also variable from year to year — some years bring floods, others bring drought.

Worked example. What is the difference between weather and climate?

Weather is the short-term, day-to-day state of the atmosphere at a place — today's temperature, rain and wind. It can change within hours.

Climate is the long-term average of that weather over a large area, measured over many years. So a single rainy day is weather; "the north-east is wet every year" is climate.

Where you'll meet it

Climate, at work

Farming depends on the monsoon

Most Indian farmers wait for the south-west monsoon before they sow. If it comes on time and brings enough rain, the harvest is good; if it is late or weak, crops can fail — which is why farming has been called a "gamble on the monsoon".

Water and disaster planning

Because rainfall is uneven and variable, towns store water in reservoirs for the dry months and plan for both floods (in the wet north-east) and droughts (in the dry west). Knowing the climate helps cities prepare for and reduce disasters.

Check yourself

Competency quiz

Modelled on the competency-based pattern — MCQ, assertion–reason and a case study, testing whether you can use the ideas, not just recall them.

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