|Time zone||IST (UTC+5:30)|
|Sex ratio||1002 ♂/♀|
|Avg. summer temperature||38–22 °C (100–72 °F)|
|Avg. winter temperature||30–17 °C (86–63 °F)|
Vriddhachalam is located at . It has an average elevation of 45 m (148 ft).
As per the 2001 census, Olaiyur had a total population of 2717 with 1357 males and 1360 females.
The climate is cool and hot, rainy during September–November. Temperatures during the summer reach maximum 38 and minimum of 22 degrees Celsius. Winter temperatures between 30 to 17 degrees Celsius.
More than 80% people are depending on Agriculture directly or indirectly. Olaiyur is the major sugarcane producing village in the District. Around 10% people are Government School Teachers. Around 5% are Doctors & Engineers. Around 5% are Businessmen (Departmental stores, Restaurant & Coffee shops, Transport, Fertilizer stores, Carpentry workshop, Vehicle workshop etc..).
This village has excellent literacy rate.cashewnuts are major products next to sugarcane.
This village hosts a Government Higher Education School, which is one of the primitive school in the locality. Now there are 3 schools in the village.
The village hosts Post office, TNEB Sub Station but lacks a primary health centre.
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