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Question
Why does the Tamil Nadu coast get rainfall in October?
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Solution
The south-west monsoon begins to withdraw from India by the first week of October. It leaves Jammu-Kashmir, the Northern Plains, then peninsular India, moving southwards and westwards. When it reaches the Chennai coast on its way backwards, it is checked by the Eastern Ghats and imparts rain to the Chennai coast. Chennai gets about 60 cm of rain from the retreating monsoon.
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There is plenty of rain in India during the rainy season, yet we need irrigation. Give two reasons to support this statement.
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| Month | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| Temperature in °C |
25.0 | 25.5 | 26.3 | 27.1 | 30.0 | 36.2 | 36.0 | 35.9 | 35.9 | 29.3 | 27.0 | 24.6 |
| Rainfall cm | 24.5 | 23.1 | 15.0 | 2.4 | 0.1 | 11.0 | 9.3 | 4.0 | 10.5 | 4.0 | 14.5 | 20.4 |
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2) What is the total annual rainfall?
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Western coastal plains receive more rainfall than the Eastern coastal plains.
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Mumbai receives rainfall in the summer season while Chennai receives rainfall from October to December. Why?
Given below is the climatic data of a station. Study the table and answer the questions that follow:
| Month | J | F | M | A | M | J | J | A | S | O | N | D |
| Temperature in Degree C. | 13.7 | 16.6 | 21.6 | 25.5 | 33.2 | 33.5 | 30.8 | 29.8 | 29.2 | 25.5 | 19.6 | 15.2 |
| Rainfall in cms. | 2.5 | 2.0 | 1.5 | 0.9 | 1.5 | 7.5 | 17.8 | 18.5 | 12.5 | 1.0 | 0.2 | 1.5 |
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