This document discusses the factors affecting India's climate and the seasonal patterns of weather in India. It describes: 1) The key geographic factors that influence India's climate, including its location, latitude, relief features like the Himalayas and Western Ghats, surface winds, air currents, and ocean patterns. 2) The seasonal patterns of weather in India - the hot weather season from March to May, the advancing monsoon from June to September, the retreating monsoon from October to November, and the cold weather season from December to February. 3) The characteristic weather features of each season, including monsoon winds, rainfall distribution, temperature variations in different regions, and seasonal precipitation patterns across India

1. A lesson for class IX

4. FACTORS AFFECTING
CLIMATE OF INDIA.
Location.Latitudinal And Peninsular
Relief features.Eg:Himalayas/Western
Ghats/Aravallies
Surface winds.Land And Sea Breeze
Air currents.Jet Streams
Southern oscillation.Sea Saw
distribution of pressure.

11. LAW OF DEFLECTION
Ferrel’s law states that,
All moving bodies in the Northern
hemisphere deflect to their RIGHT and they do to
the LEFT in the Southern hemisphere.
0 Equator
South East Trades
South west
monsoon
S .E.. Trade Changes direction as
S. W. Monsoons.

12. 1.Hot Weather Season-March to
May.
2. Advancing Monsoon- June to
September.
3. Retreating Monsoon- October to
Nov.
4. Cold Weather Season- Dec. to
February. Map, courtesy maps of india.com.

13. FEATURES OF HOT
WEATHER
1.Sun migrates to India
2. Creation of low pressure Trough inNorth
Indian Plains.
3.Loo in North West India
4.Kalbaisakhi in North East India.
5.Mango Showers in Kerala and Karnataka.

14. FEATURES OF
ADVANCING MONSOON
1.Outbreak of South West Monsoon.
2.Branching of Monsoon in to Arabian sea
branch and Bay of Bengal .
3.Advancement of rain from South to North.
4. Mawsynram receives 1080 c.m. rainfall.
5. Occurrence of dry spell.

16. FEATURES OF
RETREATING
MONSOON
1. Sun migrates to the South.
2.Low pressure Trough moves to Bay
of BENGAL.
3.October heat.
4.Originating depression in Bay of
Bengal.
5.Coromandal Coast gets rainfall.
Trees start shedding their leaves from this
season.
It is the period of depressions in
Bay of Bengal.

18. FEATURES OF COLD
WEATHER SEASON
1.Temperature decreases from South to
North.
2.Generally cool, dry, fine weather, clear
skies, low humidity and bright
sunshine.
3.North Western plain get slight rainfall
from Western Disturbances.
4.Coromandal Coast receives rainfall
from North east trade winds.
Temperature varies from
coastal locations to the
interior.
Ideal time for skiing at the
valleys of Himalayas.

19. DISTRIBUTION OF RAINFALL
1. 70% of Indian rainfall occurs between June and
September.
2.Regions of north eastern India and western sides
of the western ghats get heavy rain.
3. Between June and September Tamil Nadu gets
minimum rain.
4. Rajasthan remains dry in spite of the passage of
monsoon through it.
Maps courtesy,maps of
india.com

20. CLIMATIC VARIATIONS IN INDIA
1.In hot season the interior locations have high
temperature.
2. Coastal locations have modified weather.
3.In winter season temperature of interior
locations decrease sharply.Eg: Delhi.
4. Coastal locations still enjoy pleasant
weather.Eg: Kochi.
5.Depressions/cyclones develop above Bay of
Bengal in the retreating monsoon season.

21. VARIATIONS ON PRECIPITATION
1. Generally speaking, India as a whole
gets precipitation in the form of rain.
2.At higher altitudes of Himalayas it is in
the form of snow fall especially in
winter.

22. 3. The amount of
precipitation received is
based on various factors like
Relief, availability of of rain
clouds, direction of wind etc.

23. ADVANCING MONSOON WIND
DIRECTION
The Movement Of South West Monsoon.
.
SEA TO LAND
Low
Pressure
High
pressure
Easterly Jet
streams

24. WINTER, DIRECTION MONSOON
WIND
North east
monsoon
Western Disturbances
WESTERLY JETSTRAMS
Low pressure
High pressure
Deciduous trees shed their
leaves.

25. POSITION OF SUN ON JUNE 21 st ON INDIA
Equator
Tropic of cancer
Tropic of Capricorn

26. POSITION OF THE SUN, AWAY FROM
INDIA IN WINTER
It leads to the formation of HIGH PRESSURE
23.30 Tropic of Cancer
Equator
0.
23.30 Tropic of Capricorn

27. 1.Collect weather reports of various seasons
from the dailies.
2.Animate the reports through computer
slides.
3.Interpret them effectively.
4.Show the movements of south west and
north east monsoon through computer
slides also procure effective clip arts from
the website.