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Life in Tamil Nadu |
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The Climate of Tamil Nadu, India is generally tropical and features fairly hot temperatures over the year except during the monsoon seasons. The city of Chennai lies on the thermal equator, [1] which means Chennai and Tamil Nadu does not have that much temperature variation.
Under the Köppen climate classification the greater part of Tamil Nadu fills under Tropical savanna climate and smaller portions of the state fall under Humid subtropical climate; the climate of the state ranges from dry sub-humid to semi-arid.
The summer in Tamil Nadu runs throughout March, April and May and is characterized by intense heat and scant rainfall across the state.
The state has three distinct periods of rainfall: advanced rainfall; rainfall from the tropical cyclones emerging in the neighbourhood of the Andaman Islands during the Retreat of Monsoons(October–November): and the North-East monsoon during the months of October–December, with dominant northeast monsoon winds from the western disturbances emerging over the Bay of Bengal. The dry season is from February to early June. Mid-June to December is the monsoon months.
Since the state is entirely dependent on rains for recharging its water resources, monsoon failures lead to acute water scarcity and severe droughts.
Tamil Nadu is classified into seven agro-climatic zones: north-east, north-west, west, southern, high rainfall, high altitude hilly, and Cauvery Delta (the most fertile agricultural zone).
— | Winter (Jan – Feb) | Summer (Mar – May) | Monsoon (Jun – Sep) | Post-monsoon (Oct – Dec) | Year-round | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg |
Chennai | 24 | 25 | 27 | 29 | 31 | 30 | 30 | 28 | 27 | 26 | 25 | 24 | 31 |
Coimbatore | 25 | 26 | 28 | 29 | 29 | 27 | 25 | 26 | 25 | 24 | 23 | 24 | 29 |
Madurai | 25 | 27 | 29 | 31 | 32 | 30 | 29 | 28 | 27 | 25 | 24 | 25 | 32 |
Tiruchirapalli | 25 | 26 | 28 | 29 | 31 | 32 | 30 | 29 | 29 | 27 | 25 | 24 | 32 |
— | Winter (Jan – Feb) | Summer (Mar – May) | Monsoon 1 (Jun – Sep) | Monsoon 2 (Oct – Dec) | Year-round | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
Chennai | |||||||||||||
Coimbatore | |||||||||||||
Madurai | |||||||||||||
Tiruchirappalli |
Climate data for Chennai (Köppen Aw) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Record high °C (°F) | 34.4 (93.9) | 36.7 (98.1) | 40.6 (105.1) | 42.8 (109.0) | 45.0 (113.0) | 43.3 (109.9) | 41.1 (106.0) | 40.0 (104.0) | 38.9 (102.0) | 39.4 (102.9) | 35.4 (95.7) | 33.0 (91.4) | 45.0 (113.0) |
Mean daily maximum °C (°F) | 29.3 (84.7) | 30.9 (87.6) | 32.9 (91.2) | 34.5 (94.1) | 37.1 (98.8) | 37.0 (98.6) | 35.3 (95.5) | 34.7 (94.5) | 34.2 (93.6) | 32.1 (89.8) | 29.9 (85.8) | 28.9 (84.0) | 33.1 (91.6) |
Daily mean °C (°F) | 25.2 (77.4) | 26.6 (79.9) | 28.7 (83.7) | 30.9 (87.6) | 32.9 (91.2) | 32.4 (90.3) | 30.9 (87.6) | 30.3 (86.5) | 29.8 (85.6) | 28.4 (83.1) | 26.5 (79.7) | 25.3 (77.5) | 29.0 (84.2) |
Mean daily minimum °C (°F) | 21.2 (70.2) | 22.2 (72.0) | 24.2 (75.6) | 26.6 (79.9) | 28.0 (82.4) | 27.5 (81.5) | 26.4 (79.5) | 25.9 (78.6) | 25.6 (78.1) | 24.6 (76.3) | 23.1 (73.6) | 21.9 (71.4) | 24.8 (76.6) |
Record low °C (°F) | 13.9 (57.0) | 15.0 (59.0) | 16.7 (62.1) | 20.0 (68.0) | 21.1 (70.0) | 20.6 (69.1) | 21.0 (69.8) | 20.5 (68.9) | 20.6 (69.1) | 16.7 (62.1) | 15.0 (59.0) | 13.9 (57.0) | 13.9 (57.0) |
Average rainfall mm (inches) | 25.9 (1.02) | 3.4 (0.13) | 3.5 (0.14) | 14.4 (0.57) | 34.2 (1.35) | 55.8 (2.20) | 103.8 (4.09) | 126.8 (4.99) | 147.7 (5.81) | 315.6 (12.43) | 399.9 (15.74) | 177.4 (6.98) | 1,382.9 (54.44) |
Average rainy days | 1.4 | 0.8 | 0.3 | 0.8 | 1.8 | 4.0 | 6.5 | 7.7 | 7.3 | 10.9 | 11.5 | 5.8 | 58.8 |
Average relative humidity (%) (at 17:30 IST) | 67 | 66 | 67 | 70 | 68 | 63 | 65 | 66 | 71 | 76 | 76 | 71 | 69 |
Average dew point °C (°F) | 20 (68) | 20 (68) | 22 (72) | 24 (75) | 24 (75) | 23 (73) | 23 (73) | 23 (73) | 24 (75) | 24 (75) | 23 (73) | 21 (70) | 23 (73) |
Mean monthly sunshine hours | 232.5 | 240.1 | 291.4 | 294.0 | 300.7 | 234.0 | 142.6 | 189.1 | 195.0 | 257.3 | 261.0 | 210.8 | 2,848.5 |
Mean daily sunshine hours | 7.5 | 8.5 | 9.4 | 9.8 | 9.7 | 7.8 | 4.6 | 6.1 | 6.5 | 8.3 | 8.7 | 6.8 | 7.8 |
Average ultraviolet index | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 7 | 7 | 6 | 7 | 7 | 7 |
Source 1: Indian Meteorological Department | |||||||||||||
Source 2: Japan Meteorological Agency [5] Weather Atlas [6] Time and Date (dewpoints, 2005-2015) [7] |
Climate data for Coimbatore (Köppen BSh) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Record high °C (°F) | 35.9 (96.6) | 38.8 (101.8) | 40.8 (105.4) | 42.6 (108.7) | 41.2 (106.2) | 38.0 (100.4) | 36.2 (97.2) | 36.0 (96.8) | 37.8 (100.0) | 36.8 (98.2) | 34.2 (93.6) | 34.4 (93.9) | 42.6 (108.7) |
Mean daily maximum °C (°F) | 30.8 (87.4) | 33.6 (92.5) | 36.0 (96.8) | 36.7 (98.1) | 35.4 (95.7) | 32.4 (90.3) | 31.6 (88.9) | 31.9 (89.4) | 32.7 (90.9) | 31.9 (89.4) | 30.1 (86.2) | 29.6 (85.3) | 32.7 (90.9) |
Mean daily minimum °C (°F) | 18.8 (65.8) | 19.8 (67.6) | 21.8 (71.2) | 23.7 (74.7) | 23.7 (74.7) | 22.6 (72.7) | 22.0 (71.6) | 22.0 (71.6) | 22.1 (71.8) | 22.0 (71.6) | 20.9 (69.6) | 19.0 (66.2) | 21.5 (70.7) |
Record low °C (°F) | 12.2 (54.0) | 12.8 (55.0) | 15.8 (60.4) | 18.2 (64.8) | 15.6 (60.1) | 18.3 (64.9) | 16.1 (61.0) | 16.1 (61.0) | 16.7 (62.1) | 15.9 (60.6) | 14.1 (57.4) | 12.4 (54.3) | 12.2 (54.0) |
Average rainfall mm (inches) | 7.5 (0.30) | 4.2 (0.17) | 25.7 (1.01) | 43.6 (1.72) | 55.2 (2.17) | 23.7 (0.93) | 25.3 (1.00) | 36.1 (1.42) | 52.8 (2.08) | 157.5 (6.20) | 134.6 (5.30) | 33.3 (1.31) | 599.5 (23.61) |
Average rainy days | 0.4 | 0.6 | 1.3 | 2.9 | 3.5 | 2.7 | 2.9 | 2.8 | 3.5 | 8.2 | 6.6 | 2.2 | 37.6 |
Average relative humidity (%) (at 17:30 IST) | 41 | 33 | 31 | 42 | 56 | 66 | 68 | 68 | 66 | 67 | 64 | 53 | 54 |
Source: India Meteorological Department [8] [9] |
Climate data for Madurai (Köppen Aw/As/BSh) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Record high °C (°F) | 39.1 (102.4) | 38.5 (101.3) | 41.7 (107.1) | 42.1 (107.8) | 44.5 (112.1) | 42.2 (108.0) | 40.6 (105.1) | 40.0 (104.0) | 39.8 (103.6) | 40.0 (104.0) | 38.0 (100.4) | 37.0 (98.6) | 44.5 (112.1) |
Mean daily maximum °C (°F) | 30.8 (87.4) | 33.3 (91.9) | 36.0 (96.8) | 37.2 (99.0) | 37.9 (100.2) | 37.2 (99.0) | 36.5 (97.7) | 36.2 (97.2) | 35.1 (95.2) | 33.1 (91.6) | 30.6 (87.1) | 30.0 (86.0) | 34.5 (94.1) |
Mean daily minimum °C (°F) | 19.6 (67.3) | 21.5 (70.7) | 23.4 (74.1) | 25.6 (78.1) | 26.3 (79.3) | 26.2 (79.2) | 25.9 (78.6) | 25.5 (77.9) | 24.6 (76.3) | 23.7 (74.7) | 22.7 (72.9) | 21.3 (70.3) | 23.9 (75.0) |
Record low °C (°F) | 15.6 (60.1) | 10.5 (50.9) | 16.9 (62.4) | 19.4 (66.9) | 17.8 (64.0) | 17.8 (64.0) | 19.4 (66.9) | 20.6 (69.1) | 18.5 (65.3) | 18.9 (66.0) | 17.2 (63.0) | 16.7 (62.1) | 10.5 (50.9) |
Average precipitation mm (inches) | 8.5 (0.33) | 11.0 (0.43) | 18.3 (0.72) | 60.1 (2.37) | 80.6 (3.17) | 34.3 (1.35) | 56.9 (2.24) | 93.9 (3.70) | 121.5 (4.78) | 185.8 (7.31) | 147.2 (5.80) | 51.3 (2.02) | 869.4 (34.23) |
Average precipitation days | 0.8 | 1.1 | 1.2 | 3.3 | 4.0 | 2.2 | 2.9 | 4.6 | 6.6 | 9.7 | 6.8 | 3.4 | 46.6 |
Average relative humidity (%) | 77 | 77 | 76 | 72 | 70 | 68 | 70 | 71 | 71 | 76 | 78 | 78 | 74 |
Average ultraviolet index | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 7 |
Source 1: Indian Meteorological Department Mean data from 1981–2010 [10] [11] | |||||||||||||
Source 2: Weather Atlas [12] |
Climate data for Tiruchirappalli (Köppen Aw/As) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Record high °C (°F) | 35.6 (96.1) | 40.0 (104.0) | 42.2 (108.0) | 42.8 (109.0) | 43.3 (109.9) | 43.9 (111.0) | 41.1 (106.0) | 40.6 (105.1) | 40.6 (105.1) | 38.9 (102.0) | 36.7 (98.1) | 35.6 (96.1) | 43.9 (111.0) |
Mean daily maximum °C (°F) | 30.3 (86.5) | 32.8 (91.0) | 35.7 (96.3) | 37.5 (99.5) | 38.2 (100.8) | 37.1 (98.8) | 36.3 (97.3) | 35.8 (96.4) | 35.0 (95.0) | 32.8 (91.0) | 30.4 (86.7) | 29.6 (85.3) | 34.3 (93.7) |
Mean daily minimum °C (°F) | 20.6 (69.1) | 21.5 (70.7) | 23.5 (74.3) | 26.1 (79.0) | 26.8 (80.2) | 26.6 (79.9) | 26.1 (79.0) | 25.7 (78.3) | 24.9 (76.8) | 24.2 (75.6) | 22.8 (73.0) | 21.2 (70.2) | 24.2 (75.6) |
Record low °C (°F) | 14.4 (57.9) | 13.9 (57.0) | 15.6 (60.1) | 18.3 (64.9) | 19.4 (66.9) | 18.0 (64.4) | 20.1 (68.2) | 20.6 (69.1) | 20.6 (69.1) | 18.9 (66.0) | 16.7 (62.1) | 14.4 (57.9) | 13.9 (57.0) |
Average rainfall mm (inches) | 13.3 (0.52) | 3.6 (0.14) | 5.3 (0.21) | 29.6 (1.17) | 67.0 (2.64) | 38.3 (1.51) | 60.5 (2.38) | 69.9 (2.75) | 153.4 (6.04) | 153.9 (6.06) | 168.0 (6.61) | 81.4 (3.20) | 844.2 (33.24) |
Average rainy days | 0.9 | 0.4 | 0.6 | 1.7 | 3.8 | 2.6 | 2.7 | 4.1 | 7.1 | 9.2 | 8.1 | 5.1 | 46.3 |
Average relative humidity (%) (at 17:30 IST) | 54 | 43 | 37 | 41 | 42 | 44 | 45 | 46 | 52 | 64 | 70 | 65 | 50 |
Source: India Meteorological Department [13] [14] |
Mostly, desert soils are seen around Madurai, Virudhunagar, Sivaganga, Ramanathapuram and some parts of Tirunelveli dist, a few adjoining districts. These districts are formally known as the desert districts of Tamil Nadu.
During the 2015 South Indian floods (most affected districts: Chennai, Kanchipuram and Cuddalore), Chennai received 1,049 mm (41.3 in) of rainfall in November, the highest recorded since November 1918 when 1,088 mm (42.8 in) of rainfall was recorded.[24][25] The flooding in Chennai was described as the worst in a century.[26]
The air quality of industrial areas in Ennore, as well as in Poes Garden and Boat Club are above the standards prescribed by the environment ministry, according to a report by Coastal Resource Centre.
The centre took eleven air samples in and around North Chennai and Chennai city as part of their air quality study in Ennore 2016. 24-hour samples were taken using filters fitted to a low volume air sampler and analysed for PM 2.5 (Particulate Matter or dust less than 2.5 micrometres in size). The key documented sources of PM 2.5 pollution are automobile exhaust, burning of coal, burning garbage and landfill, smelting processing of metals.
Surprisingly, 10 out of the 11 air samples were between 1.4 and 3.7 times higher than prescribed by the Ministry of Environment, Forests and Climate Change. The quality of air in Nallathaneer Odai Kuppam in Ennore is the highest with 220 micrograms of particulate matter per cubic meter of air.
Other areas from Ennore include Manali with 156 ug/m3, Sivanpadaiveethi Kuppam with 156. 90 ug/m3 and Kodingayur with 154.90 ug/m3 which is all considered very unhealthy according to the US Environment Protection Agency.
The Ennore region has 3300 MW of installed coal power plant capacity, with more than 1500 acres as dedicated coal ash dumps, says the report.
Highlighting the health effects of bad air quality, Dr Hissamudin Papa, Founder and Director, HUMA Hospitals said, "We visited these areas in Ennore and found various health issues. Children who are 14 to 15 years old look like they are 8 years old. Women have hormonal issues and infertility. Many people have chronic obstructive pulmonary disease in these areas. The pollution needs to be reduced in these areas.
Even areas like Poes Garden and Boat Club ranged 104 and 101 UG/ M3 which is considered unhealthy according to US EPA standards. "The high concentration of polluting industries in the city’s northern and southern edges is affecting all of Chennai," said Dr Rakhal Gaitonde, a public health specialist.
According to the report by the Coastal Resource Centre, the level of manganese in eight of the eleven samples exceed the US EPA reference concentration for exposure to manganese. There are no standards in India for manganese in ambient air. Also, the levels of calcium silicon and crystalline silica, which are enriched in coal ash were found in the air samples.
"Manganese and nickel are well-known toxins and their effects are well-documented. Manganese is predominantly a neurotoxin, while nickel is a carcinogen. The measurement of such toxic substances from the rooftops of human settlements is indeed a cause of concern," added Dr Rakhal.
The Coastal Resource Centre wants the Tamil Nadu government to take immediate action to improve the air quality in Ennore. "The government needs to impose a moratorium on all industrial activities till the environment is restored, initiate long-term and continuous monitoring in Ennore region," said Nityanand Jayaraman, an environment activist.
He added, "No norms are followed by the Tamil Nadu Pollution Control Board. Why should people living in North Chennai have to bear all the harmful effects of the industries?"
The Coastal Resource Centre also wants the government to apprehend polluters and take corrective actions to bring the levels of dust and heavy metals in the dust below detection limits in residential areas.
The climate of Mumbai is tropical, with defined wet and dry seasons. The mean annual temperature is 27.7 °C or 81.9 °F. Average annual rainfall is 2,213.4 millimetres or 87 inches in Colaba, which represents South Mumbai and 2,502.3 millimetres or 99 inches in Santacruz, which represents central and suburban Mumbai. The mean maximum average temperatures is about 32 °C (90 °F) in summer and 30 °C (86 °F) in winter, while the average minimums are 26 °C (79 °F) in summer and 18 °C (64 °F) in winter. The city experiences a lengthy, practically rainless dry season, and a relatively short, but extremely rainy wet season; due to the Southwest Monsoon and orographic influences from the nearby Western Ghats.These conditions effectively place Mumbai between a Tropical monsoon climate (Am) and a Tropical savannah climate (Aw), with more tilt towards the former considering annual precipitation.
The climate of India consists of a wide range of weather conditions across a vast geographic scale and varied topography. Based on the Köppen system, India encompasses a diverse array of climatic subtypes. These range from arid and semi-arid regions in the west to highland, sub-arctic, tundra, and ice cap climates in the northern Himalayan regions, varying with elevation. The northern lowlands experience subtropical conditions, with some areas at higher altitudes, like Srinagar, touching continental climates. In contrast, much of the south and the east exhibit tropical climate conditions, which support lush rainforests in these territories. Many regions have starkly different microclimates, making it one of the most climatically diverse countries in the world. The country's meteorological department follows the international standard of four seasons with some local adjustments: winter, summer, monsoon or rainy season, and a post-monsoon period.
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