Check "Climate of Karachi" on wikipedia....i made that article......your answer waits you there...........
Karachi receives less rainfall primarily due to its geographical location and climate. Situated in a coastal area, it experiences a hot desert climate with limited monsoon influence, as the southwest monsoon winds that bring rain to other parts of Pakistan often lose moisture before reaching the city. Additionally, urbanization and the urban heat island effect can exacerbate aridity in the region. As a result, annual precipitation in Karachi is relatively low compared to other areas in the country.
north east monsoon
India has heavy seasonal rainfall brought by monsoon winds
The retreating rainfall monsoon occurs when the temperature on land is significantly warmer or cooler than the temperature of the ocean.
Punjab receives rainfall from 3 sources- western disturbances, south west monsoon winds and retreating monsoon winds.
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Karachi, Pakistan, experiences a hot desert climate, characterized by high temperatures and low annual rainfall. Summers are extremely hot, with temperatures often exceeding 40°C (104°F), while winters are milder and more pleasant. Rainfall is scarce, mainly occurring between July and September during the monsoon season. The coastal location also brings humidity, particularly in the summer months.
In the context of the monsoon season, a 'break' refers to a period of temporary cessation or reduction in rainfall after a sustained period of heavy rains. It is usually characterized by drier conditions and a respite from the intense monsoon precipitation.
The district with lowest rainfall in kerala is thiruvananthapuram in southern kerala it received only 523 mm rainfall in the south west monsoon .mainly southern kerala recieves the lowest rainfall. thiruvanthapuram recorded 27 % deficient rainfall during the south west monsoon rainfall in kerala.
Chennai
Chembakolli receives an average annual rainfall of about 1500-2000 millimeters. The region experiences a monsoon climate with heavy rainfall during the monsoon season.
South west monsoon brings rain during summer whereas north east monsoon brings rain during winter direction of sw monsoon is sea to land so it brings huge amount of rainfall throughout india direction of ne monsoon is land to sea so it does not contain moisture and brings dryness and coldness after blowing through bay of bengal it brings rainfall in tamil nadu the am,t of rainfall from this branch is low and it doesnt bring rain throughout india