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Questions
Give reasons for the following:
When the Malabar Coast is receiving heavy rainfall in July, the Tamil Nadu coast is comparatively dry.
Give a geographical reason for the following:
When the Malabar coast is receiving heavy rainfall in July, the Tamil Nadu coast is comparatively dry.
Give reasons why:
When the Malabar coast is receiving heavy rainfall in July, the Tamil Nadu coast is comparatively dry.
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Solution
- The Malabar Coast (on the western side of India) receives heavy rainfall during the southwest monsoon (in July) because it is on the windward side of the Western Ghats. The moist air from the Arabian Sea is forced to rise as it hits the mountains, cooling and condensing to form heavy rainfall.
- On the other hand, the Tamil Nadu Coast is located on the leeward side of the Western Ghats. As the moist air moves over the Western Ghats, it loses much of its moisture before reaching Tamil Nadu. This makes the region relatively dry during the monsoon season, experiencing only light rainfall or no rainfall at all during this time.
Notes
Students should refer to the answer according to the question.
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Name an area in India where Tropical Monsoon forest is found.
Study the climate data given below and answer the questions that follow:
| 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 |
1) Calculate the annual temperature range.
2) What is the total annual rainfall?
3) Presuming that the station is located in India, give a reason for its location being on the east coast or west coast of India.
| Stations | Latitude | Altitude (Metres) | Jan. | Feb. | Mar. | Apr. | May. | Jun. | July. | Aug. | Sep. | Oct. | Nov. | Dec. | Annual Rainfall |
|
Temperature (°C) |
20.5 |
22.7 |
25.2 |
27.1 |
26.7 |
24.2 |
23.0 |
23.0 |
23.1 |
22.9 |
18.9 |
20.2 |
|||
| Bengaluru | 12°58'N | 909 |
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| Rainfall (cm) | 0.7 | 0.9 | 1.1 | 4.5 | 10.7 | 7.1 | 11.1 | 13.7 | 16.4 |
15.3 |
6.1 |
1.3 |
88.9 | ||
|
Temperature (°C) |
24.4 |
24.4 |
26.7 |
28.3 |
30.0 |
28.9 |
27.2 |
27.2 |
27.2 |
27.8 |
27.2 |
25.0 |
|||
|
Mumbai |
19° N | 11 |
|
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|
Rainfall (cm) |
0.2 |
0.2 |
– |
– |
1.8 |
50.6 |
61.0 |
36.9 |
26.9 |
4.8 |
1.0 |
– |
183.4 | ||
|
Temperature (°C) |
19.6 |
22.0 |
27.1 |
30.1 |
30.4 |
29.9 |
28.9 |
28.7 |
28.9 |
27.6 |
23.4 |
19.7 |
|||
|
Kolkata |
22°34'N | 6 |
|
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|
|
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|
|
|
|
|
|
Rainfall (cm) |
1.2 |
2.8 |
3.4 |
5.1 |
13.4 |
29.0 |
33.1 |
33.4 |
25.3 |
12.7 |
2.7 |
0.4 |
162.5 | ||
|
Temperature (°C) |
14.4 |
16.7 |
23.3 |
30.0 |
33.3 |
33.3 |
30.0 |
29.4 |
28.9 |
25.6 |
19.4 |
15.6 |
|||
|
Delhi |
29° N | 219 |
|
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|
|
|
|
|
|
|
|
|
|
Rainfall (cm) |
2.5 |
1.5 |
1.3 |
1.0 |
1.8 |
7.4 |
19.3 |
17.8 |
11.9 |
1.3 |
0.2 |
1.0 |
67.0 | ||
|
Temperature (°C) |
16.8 |
19.2 |
26.6 |
29.8 |
33.3 |
33.9 |
31.3 |
29.0 |
20.1 |
27.0 |
20.1 |
14.9 |
|||
|
Jodhpur |
26°18'N | 224 |
|
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|
|
|
|
|
|
|
|
|
|
|
Rainfall (cm) |
0.5 |
0.6 |
0.3 |
0.3 |
1.0 |
3.1 |
10.8 |
13.1 |
5.7 |
5.7 |
0.2 |
0.2 |
36.6 | ||
|
Temperature (°C) |
24.5 |
25.7 |
27.7 |
30.4 |
33.0 |
32..5 |
31.0 |
30.2 |
29.8 |
28.0 |
25.9 |
24.9 |
|||
|
Chennai |
13°4'N | 7 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rainfall (cm) |
4.6 |
1.3 |
1.3 |
1.8 |
3.8 |
22.2 |
8.7 |
11.3 |
11.9 |
30.6 |
35.0 |
0.2 |
128.6 | ||
|
Temperature (°C) |
21.5 |
23.9 |
28.3 |
32.7 |
35.5 |
32.0 |
27.7 |
27.3 |
27.9 |
26.7 |
23.1 |
20.7 |
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|
Nagpur |
21°9'N | 312 |
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|
|
|
|
|
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|
|
|
Rainfall (cm) |
1.1 |
2.3 |
1.7 |
1.6 |
2.1 |
22.2 |
37.6 |
28.6 |
18.5 |
5.5 |
2.0 |
13.9 |
124.2 | ||
|
Temperature (°C) |
9.8 |
11.3 |
15.9 |
18.5 |
19.2 |
20.5 |
21.1 |
20.9 |
20.9 |
17.2 |
13.3 |
10.4 |
|||
|
Shillong |
24°34'N | 1461 |
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|
|
|
|
|
|
|
|
|
|
|
|
|
Rainfall (cm) |
1.4 |
2.9 |
5.6 |
14.6 |
29.5 |
47.6 |
35.9 |
34.3 |
30.2 |
18.8 |
3.8 |
1.0 |
225.3 | ||
|
Temperature (°C) |
26.7 |
27.3 |
28.3 |
28.7 |
28.6 |
26.6 |
26.2 |
26.2 |
26.5 |
26.7 |
26.6 |
26.5 |
|||
|
Thiruvananthapuram |
8°29'N | 61 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rainfall (cm) |
2.3 |
2.1 |
3.7 |
10.6 |
20.8 |
35.6 |
22.3 |
14.6 |
13.8 |
27.3 |
20.6 |
7.5 |
181.2 | ||
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Temperature (°C) |
−8.5 |
−7.2 |
−0.6 |
6.1 |
10.0 |
14.4 |
17.2 |
16.1 |
12.2 |
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0.0 |
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Leh |
34°N | 3506 |
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|
Rainfall (cm) |
1.0 |
0.8 |
0.8 |
0.5 |
0.5 |
0.5 |
1.3 |
1.3 |
0.8 |
0.5 |
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0.5 |
8.5 |
In above Table the average mean monthly temperatures and amounts of rainfall of ten representative stations have been given. It is for you to study on your own and convert them into ‘temperature and rainfall’ graphs. A glance at these visual representations will help you to grasp instantly the similarities and differences between them. One such graph (Figure 1) is already prepared for you. See if you can arrive at some broad generalisations about our diverse climatic conditions. 
The latitudinal extent of India is responsible for the variation in the climatic conditions which prevail in the country.
Chennai has a lower annual range of temperature than Lucknow.
Though Mangalore and Mysore are on the same latitude, Mangalore experiences more rainfall than Mysore. Give reasons.
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 |
(i) Calculate the annual range of temperature.
(ii) What is the total rainfall experienced by the station?
(iii) Which is the driest month?
Study the climatic data given below and answer the questions that follow:
| Month | Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sep. | Oct. | Nov. | Dec. |
| °C | 25.0 | 25.5 | 26.3 | 27.1 | 30.0 | 36.2 | 36.0 | 35.9 | 30.3 | 28.4 | 27.0 | 24.6 |
| cm | 24.5 | 23.1 | 15.0 | 2.4 | 0.1 | 11.0 | 9.3 | 7.2 | 4.0 | 9.4 | 14.5 | 20.4 |
(i) Calculate the annual temperature range.
(ii) What is the total annual rainfall?
(iii) Presuming that the station is located in India, give a reason for its location being on the east coast or the west coast of India.
Give one example of ‘Rain Shadow’ areas in India.
The average rainfall of India is about ______.
