Chennai lies on the Eastern Coastal Plains in the southeastern coast of India. The average elevation is 6 meters (20 feet). Daytime temperatures in summer range between 38 °C and 42 °C, though sometimes it goes beyond 42 °C. It gets most of its annual rainfall from the north-east monsoon winds, from mid-October to mid-December. The Cooum (or Koovam) and Adyar rivers flow through the city. Chennai has several lakes like Red Hills, Sholavaram and Chembarambakkam Lake, which supply the city with potable water.
Chennai is situated to the south eastern coast of India on a flat coastal plain. The coast stretches around 25.60 kms. The city district lies between 12 ^9' and 13^9' north latitude and 80^ 12' and 80^ 19' south longitude.
Chennai has mainly two seasons - summer (35-42°C / 95-108°F) Apr-Jun (Highest temperature ever recorded is 45°C / 113°F on 30 May 2003) and monsoon (Oct-Dec). It receives scanty rainfall from the south-west monsoon (Jun-Sep) while rest of India is lashed by heavy rains, but gets its bountiful rains from the north-east monsoon from October through December, thus amounting to about 125-150 cm (49-59 in) of rainfall annually. Rainfalls occur usually from October to December and dried up scrub lands bloom with greenery during this period.
December to February are the mildest months temperature - (19-28°C / 66-82°F). December to March is probably the best time to visit Chennai: the temperatures rarely exceed 30°C during midday and evenings are pleasant.
Climate is humid pretty much throughout the year because the city is on the coast. Summers are very hot and humid. Winter fashion has never been of any use in Chennai, wearing a sweater will leave you drenched in sweat in less than five minutes.
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