Video summary

Rajasthan Computer Anudeshak Bharti 2026 | Rajasthan Geography Class – जलवायु | Deendayal Sir

Main summary

Key takeaways

Educational

Main ideas / lessons

  • Rajasthan Computer Instructor recruitment context
    • The speaker greets students and says the notification, exam date, and syllabus are already released.
    • Motivation: students should intensify preparation to ensure selection.
    • What has been covered previously (in geography):
      • General introduction of Rajasthan
      • Divisional system of Rajasthan
      • Geographical introduction of Rajasthan
    • Today’s new topic: “Climate of Rajasthan (जलवायु)”

Core geography definitions: climate vs season vs weather

  • Climate: long-term atmospheric conditions of a region for about 30–35 years.
  • Season: atmospheric conditions lasting about 3–4 months.
  • Weather: the short-term/temporary atmospheric condition of a place for roughly 3–4 hours.

Examples used

  • Different nearby cities can have different short-term conditions (sunny vs raining vs storm).
  • Day’s progression (sun → clouds → rain → sun again) illustrates “weather/short-term change.”

Study advice

  • Learn the definition first—it makes exam preparation easier.

Earth–Sun geometry and latitudes used to explain climate zones

  • Earth is described as geoid-like, slightly flattened (not a perfect sphere).
  • Imaginary lines:
    • Equator (0° latitude)
    • Tropic of Cancer (23° North)
    • Tropic of Capricorn (23° South)

Key dates when the Sun is directly overhead

  • 21 March and 23 September → directly on the Equator
  • 21 June → directly on Tropic of Cancer
  • 22 December → directly on Tropic of Capricorn

Earth’s motions (conceptual)

  • Rotation (west → east): causes day and night
  • Revolution/orbital motion: about 365 days 5 hours 48 minutes 46 seconds, contributing to seasonal change

Major climate/temperature zones by latitude

  • Tropical zone

    • Hot region near the equator; associated with latitudes around 23.5°N to 23.5°S (between the tropics).

  • Cold zones (polar regions)

    • Arctic Circle: roughly 66° to 90° North
    • Antarctic Circle: roughly 66° to 90° South
    • Poles: snow, and day for ~6 months + night for ~6 months

  • Temperate zone

    • Between tropical and polar limits; summer/winter are relatively moderate.

  • The lecture also mentions an intermediate belt as “sub-tropical/sub-tropical zone”.

How Rajasthan’s climate is determined

  • Rajasthan’s latitude range (as stated by the speaker):
    • From ~23° 3′ North to ~30° 12′ North

Conclusion

  • Rajasthan lies mostly in the subtropical belt, so its climate is hot and subtropical.

Examples supporting the reasoning

  • Africa: hotter near middle latitudes; colder toward poles.
  • Europe/England: temperate zone
  • Antarctica: cold/polar-type climate (Arctic/cold contrast)
  • Ganganagar: described as cold relative to Rajasthan, due to contrasting latitudinal placement.

District examples

  • Dungarpur and Banswara: said to have more tropical influence
    • Reason: located closer to the Tropic of Cancer / near or below relevant tropic lines (around/under 23.5°N).

Two Earth-motion concepts linked to seasonal/day-night patterns

  • Rotation: causes daily changes (day/night).
  • Revolution: causes seasonal changes through the Sun’s shifting overhead position across latitudes.

The speaker uses a “sunlight diary”-style hypothetical sequence:

  • Sun appears over equator → Tropic of Cancer → equator → Tropic of Capricorn → back, with hemispheric day/night duration logic.

Polar emphasis is repeated:

  • One pole experiences long day while the other experiences long night during parts of the year.

Factors affecting the climate of Rajasthan (detailed list)

The lecture transitions from general climate zones to Rajasthan-specific climate factors, listed below.

How to prepare/answer climate-related exam questions

  • First master definitions (climate/season/weather).
  • Learn Sun–latitude dates:
    • 21 March, 23 Sep, 21 June, 22 Dec
  • Use latitude ranges to identify the climate zone (tropical/subtropical/temperate/cold).
  • For MCQs:
    • Choose based on concept + exact facts (e.g., distances/latitude zones).
    • Practice and explain options to reduce confusion.

Enumerated factors affecting the climate of Rajasthan

  1. Distance from the sea

    • Rajasthan is far from seas (Gulf of Kutch / Gulf of Khambhat / Arabian Sea / Bay of Bengal).
    • Result: less rainfall, leading to aridity and drought-prone conditions.
    • Approximate distance figures stated:
      • From Gulf of Kutch: ~225 km
      • From Gulf of Khambhat: ~275 km
      • From Arabian Sea: ~350–400 km
      • From Bay of Bengal: ~2900 km
    • Study tip: if options are given, guidance like “between 350–400, choose ~380” may be used.

  2. Surface relief (uneven landforms)

    • Rajasthan has varied terrain: mountains/hills/plateaus/plains/deserts.
    • Altitude-temperature concept:
      • Temperature decreases by 1°C when height increases by ~165 m.
      • Temperature increases by 1°C when going ~32 m downward.
    • Therefore, terrain influences local temperature patterns.

  3. Position of Aravalli mountains relative to Arabian Sea monsoon

    • Monsoon enters from the south-west.
    • Aravalli is framed as running parallel to the monsoon path.
    • Impact: monsoon is not forced into uniformly heavy rainfall → rainfall remains limited.

  4. Population growth

    • Increasing population leads to:
      • Cutting of natural vegetation/trees
      • Expansion of residential areas
    • Result: climate impacts are described as worsening conditions.

  5. Industrialization

    • More industries → pollution increases
    • Result: climate is affected.

  6. Latitudinal position

    • Rajasthan’s climate depends on its latitude (subtropical/tropical influence).

  7. Patchy rainfall (uneven distribution)

    • Rainfall doesn’t occur everywhere at the same time/amount.
    • Variants:
      • Rain in some places while nearby areas remain dry
      • Sudden/intermittent rainfall followed by sun
    • Mentions extremes:
      • Excessive rainfall can destroy crops
      • Drought due to prolonged dry spells over years

  8. Western Rajasthan as the rain-shadow region of Aravalli

    • Clouds may be present but rain does not fall.
    • Result: western Rajasthan gets very little rain.

  9. Variation in temperature

    • Temperature across Rajasthan is not uniform.
    • Stronger day–night temperature difference is emphasized.

  10. Difference in humidity

    • Humidity varies across regions.

  11. Lack of natural vegetation

    • Linked to National Forest Policy: about 1/3 (33.33%) forest cover should exist (as stated).
    • Rajasthan’s forest cover said to be only ~9.60%.
    • Illegal cutting from agricultural areas reduces vegetation and worsens land conditions.

Transition to next topic

  • The speaker says that next they will study classification of seasons based on climate and ends the session with greetings.

Speakers / sources featured (as mentioned)

  • Deendayal Sir (primary speaker/teacher)
  • Ram Kumar Sir (referenced in a hypothetical/example demonstration)
  • Dr. H. M. Saxena (source for the “average distance of Rajasthan from Arabian Sea: 350–400 km” claim)
  • RWS State Exam family / RWS State Exam community (group addressed; not a distinct external source)
  • Students / viewers (general reference; not named speakers)

Original video