Climate of India Overview

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Questions and Answers

What is the climate of India primarily described as?

Monsoon type.

What two main elements of climate are discussed in relation to India?

Temperature and precipitation.

How does temperature in Rajasthan compare to that in Pahalgam during summer?

Rajasthan can reach 50°C, while Pahalgam is around 20°C.

What is the winter temperature of Drass in Jammu and Kashmir?

<p>As low as minus 45°C.</p> Signup and view all the answers

What temperature difference can occur between day and night in the Thar Desert?

<p>Day can reach 50°C, dropping to near 15°C at night.</p> Signup and view all the answers

What factors contribute to weather and climate conditions?

<p>Temperature, atmospheric pressure, wind, humidity, and precipitation.</p> Signup and view all the answers

How does the definition of weather differ from climate?

<p>Weather is the state of the atmosphere at a specific time, while climate is the average over a long period.</p> Signup and view all the answers

What is the main characteristic of the monsoon type of climate?

<p>It is characterized by a distinct seasonal pattern with significant weather changes from one season to another.</p> Signup and view all the answers

How do cyclonic disturbances affect the northern plains during the cold weather season?

<p>They bring winter rains and snowfall in the mountains, which are crucial for agriculture.</p> Signup and view all the answers

What are the four main seasons identified in India?

<p>The cold weather season, hot weather season, advancing monsoon, and post-monsoon.</p> Signup and view all the answers

What influences the temperature variation in the peninsular region during winter?

<p>The moderating influence of the sea leads to minimal temperature variation.</p> Signup and view all the answers

What phenomenon occurs in early June related to the advancing monsoon?

<p>A low-pressure condition over the northern plains intensifies, attracting trade winds.</p> Signup and view all the answers

What does the term 'monsoon' refer to?

<p>'Monsoon' refers to the seasonal reversal in the wind direction during a year.</p> Signup and view all the answers

How is India’s climate characterized?

<p>India has a tropical monsoon climate which features distinct wet and dry seasons.</p> Signup and view all the answers

What is the average annual precipitation in Meghalaya?

<p>The average annual precipitation in Meghalaya is over 400 cm.</p> Signup and view all the answers

Where do most parts of India primarily receive rainfall?

<p>Most parts of India receive rainfall primarily from June to September.</p> Signup and view all the answers

What is one reason most deserts are located in the western margins of continents?

<p>Most deserts are located in the western margins of continents due to high pressure and dry air in the subtropics.</p> Signup and view all the answers

How does relief influence the climate of a location?

<p>Relief influences climate by acting as barriers that can block cold or hot winds and affect precipitation.</p> Signup and view all the answers

What roles do temperature contrasts play in weather patterns?

<p>Temperature contrasts create variations in weather patterns, especially in interior regions where seasonal contrasts are more pronounced.</p> Signup and view all the answers

Why does rainfall generally decrease from east to west in the Northern Plains?

<p>Rainfall generally decreases from east to west in the Northern Plains due to decreasing moisture from the prevailing winds.</p> Signup and view all the answers

When do certain coastal areas like Tamil Nadu receive significant rainfall?

<p>Tamil Nadu receives a large portion of its rain during October and November.</p> Signup and view all the answers

What is continentality in terms of climate effects?

<p>Continentality refers to the experience of very hot summers and very cold winters as the distance from the sea increases.</p> Signup and view all the answers

How do ocean currents affect coastal climates?

<p>Ocean currents warm or cool coastal areas depending on whether they are warm or cold currents.</p> Signup and view all the answers

What role do north easterly winds play in India's climate?

<p>North easterly winds originate from the subtropical high-pressure belt and move towards the equatorial low-pressure area.</p> Signup and view all the answers

Why do the north easterly winds carry little moisture?

<p>These winds originate over land, where they gather little or no moisture.</p> Signup and view all the answers

What is the cold weather season in northern India?

<p>The cold weather season begins in mid-November and lasts until February.</p> Signup and view all the answers

What are some atmospheric conditions affecting India's climate?

<p>India's climate is affected by pressure and surface winds, upper air circulation, and cyclonic disturbances.</p> Signup and view all the answers

How do the Coriolis force affect the winds in India?

<p>The Coriolis force deflects the north easterly winds to the right as they move southward.</p> Signup and view all the answers

What moderating influence does the sea have on climate?

<p>The sea moderates climate by preventing extreme temperature variations, keeping coastal areas milder.</p> Signup and view all the answers

What seasonal variations are associated with India's monsoons?

<p>India experiences an advancing monsoon and a retreating monsoon, with some regional variations.</p> Signup and view all the answers

Why is India not considered an arid land despite having dry winds?

<p>India receives substantial rainfall during the monsoon season, preventing it from becoming an arid land.</p> Signup and view all the answers

What are the average temperatures in the northern plains of India during winter?

<p>The average temperatures range between 10°C and 15°C.</p> Signup and view all the answers

How does the temperature in Chennai compare to that in the northern plains during winter?

<p>Chennai's average temperature is between 24°– 25° Celsius, which is significantly warmer than the northern plains.</p> Signup and view all the answers

What is the Coriolis force and its effect in the northern hemisphere?

<p>The Coriolis force is an apparent force caused by the Earth's rotation, deflecting winds towards the right in the northern hemisphere.</p> Signup and view all the answers

During winter, which winds prevail over India and from where do they blow?

<p>Northeast trade winds prevail, blowing from land to sea.</p> Signup and view all the answers

What weather conditions are typical in the northern part of India during winter?

<p>The weather is typically marked by cold temperatures, frost, and occasional snowfall in higher altitudes.</p> Signup and view all the answers

What characterizes the pressure and wind conditions over India in summer?

<p>A low-pressure area develops, causing a reversal of wind directions.</p> Signup and view all the answers

What is the temperature condition at night in the northern part of India during winter?

<p>Nights are generally cold.</p> Signup and view all the answers

What causes some rainfall on the Tamil Nadu coast during the winter season?

<p>Rainfall occurs due to northeast trade winds blowing from sea to land.</p> Signup and view all the answers

Explain the impact of relief on wind directions in northern India.

<p>Relief influences winds to blow through the Ganga valley from the west and northwest.</p> Signup and view all the answers

What type of sky and humidity is typically observed in northern India during winter?

<p>The weather features a clear sky with low humidity.</p> Signup and view all the answers

Flashcards

What is climate?

Climate refers to the typical weather conditions of a region over a long period (more than 30 years). It's the overall sum of weather patterns in a specific area.

What is weather?

Weather refers to the state of the atmosphere at a particular time and place. It's what you experience outside right now.

What are the elements of weather and climate?

Temperature, atmospheric pressure, wind, humidity, and precipitation are the main elements that make up both weather and climate.

What type of climate does India have?

India's climate is characterized by distinct seasons influenced by the monsoon winds, leading to a largely wet summer and generally dry winter.

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Are there regional variations in India's climate?

While India has a generally similar climate pattern, there are notable regional variations. Temperatures and precipitation differ greatly between regions and even within the same region depending on the season.

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How do day and night temperatures vary in India?

Temperature differences between day and night can be significant in some parts of India, especially in deserts. Daytime temperatures may be extremely high, while night temperatures can drop significantly.

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What are some examples of extreme temperatures in India?

The highest temperatures in India can be found in the Rajasthan desert where the mercury can reach 50°C. On the other hand, winter temperatures in Drass, Jammu and Kashmir can drop to -45°C.

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Monsoon

The seasonal reversal of wind direction during a year, typically associated with changes in precipitation patterns.

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Annual Precipitation

The amount of precipitation received in a given area over a year.

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Seasonal Precipitation Distribution

The distribution of precipitation over different months of the year.

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Climate Variations

Variations in temperature and precipitation across a region, often influenced by factors such as distance from the coast and elevation.

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Climate

The average weather conditions over a long period of time, often characterized by temperature, precipitation, and wind patterns.

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Seasonal Contrast

The difference in temperature between the warmest and coldest months of the year.

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Relief and Climate

The influence of mountains on climate, acting as barriers to winds and sometimes causing increased precipitation.

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Deserts and Western Continent Locations

The tendency for deserts to be located on the western sides of continents in subtropical regions.

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Factors Affecting Climate

The influence of latitude, altitude, and proximity to the sea on the climate of a region.

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Hot Weather Season (Summer) in India

The period from March to May when the sun's position shifts northward, bringing heat and higher temperatures to India.

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Monsoon Climate

Distinct seasonal changes in weather conditions, particularly in India's interior, caused by the influence of the monsoon winds.

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Advancing Monsoon (The Rainy Season)

The seasonal wind system that brings heavy rainfall to India during the summer months due to low-pressure conditions over the northern plains.

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Winter Rains (‘Mahawat’)

Winter rainfall in India, primarily over the plains and as snowfall in the mountains, caused by low-pressure systems originating in the Mediterranean and western Asia.

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‘Rabi’ Crops

A type of agricultural crop that is planted in the winter and harvested in the spring in India, benefiting from the 'mahawat' winter rains.

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What is the Coriolis Force?

An apparent force caused by Earth's rotation. It deflects winds to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

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What are the Northeast Trade Winds?

Dry winds blowing from a high-pressure area north of Himalayas towards low-pressure areas over the oceans.

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What is Winter in India?

The season when high-pressure forms in the northern Himalayas and low-pressure forms over the oceans.

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What is Summer in India?

The season when a low-pressure area forms over the Indian subcontinent, drawing moisture-laden winds.

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What are the Southwest Monsoon Winds?

Moist winds blowing from the Indian Ocean towards northwestern India, bringing heavy rainfall.

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What is a High-Pressure Area?

A large region of high atmospheric pressure, causing air to move outwards.

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What is a Low-Pressure Area?

A large region of low atmospheric pressure, causing air to move inwards.

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What is Wind?

The movement of air from a high-pressure area to a low-pressure area.

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How do temperatures vary in India?

The change in temperature from south to north in India.

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What are the winds in the northern plains during winter?

The winds that blow from the west and northwest through the Ganga valley.

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Moderating Influence of the Sea

The effect of a large body of water on the climate of a nearby landmass, leading to less extreme temperature variations.

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Continentality

The tendency for inland areas to experience greater temperature extremes compared to coastal regions.

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Atmospheric Circulation

The movement of air masses over a large geographic area, driven by differences in pressure and temperature.

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Coriolis Effect

The force that deflects moving objects (like air) to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

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Northeast Trade Winds

Winds that originate from the subtropical high-pressure belt and blow towards the equator.

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Advancing Monsoon

When the monsoon winds are blowing towards India, bringing rain and cooler temperatures.

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Retreating Monsoon

When the monsoon winds are blowing away from India, causing drier weather and cooler temperatures.

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Cold Weather Season (winter)

A period of cold weather in India, typically from mid-November to February, characterized by cool temperatures and clear skies

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Tropical Cyclone

A type of cyclone that develops over tropical oceans and brings heavy rainfall, strong winds, and storm surges.

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Study Notes

Climate of India

  • India's climate is described as monsoon type, primarily found in South and Southeast Asia.
  • Regional variations in climate exist despite a general pattern.
  • Key elements include temperature and rainfall, which vary regionally and seasonally.

Temperature Variations

  • Summer temperatures can reach 50°C in Rajasthan, while being much lower in other areas like Pahalgam (20°C).
  • Winter temperatures can drop to -45°C in Drass, while remaining warmer at Thiruvananthapuram (22°C).
  • Day-night temperature differences vary significantly; the Thar Desert experiences large fluctuations while the Andaman and Nicobar islands and Kerala have smaller differences.

Rainfall Variations

  • Precipitation varies significantly across the country.
  • High rainfall areas include Meghalaya (over 400 cm) and low rainfall areas include Ladakh and Western Rajasthan (under 10 cm).
  • Rainfall occurs mainly from June to September, but Tamil Nadu receives some rainfall outside this period.
  • Variations in precipitation include the form (snowfall in Himalayas, rain elsewhere), and seasonal distribution.

Climatic Controls

  • Latitude, altitude, pressure and wind patterns, distance from the sea (continentality), ocean currents, and relief features control a region's climate.
  • Latitude affects temperature gradients, decreasing from equator towards the poles.
  • Altitude leads to cooler temperatures at higher elevations.
  • Ocean proximity moderates temperatures in coastal regions.
  • Relief features (mountains) can act as barriers or cause precipitation.

Seasons

  • India has four main seasons:
    • Cold weather season (November-February): Cooler temperatures, particularly in the north. Light winds and clear skies.
    • Hot weather season (March-May): Shift of the sun's path north-wards, leading to high temperatures, especially in the northwest of the country.
    • Advancing monsoon season (June-September): The start of heavy rainfall, influenced by low-pressure conditions attracting moist winds.
    • Retreating monsoon season (October-November): Monsoon withdraws; changes from wet to drier conditions; "October heat" and potential for cyclonic activity.

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