Arni, in Tamil Nadu, India, is home to roughly 63,700 people in the India Standard Time zone at 12.7°N latitude.
In 2025, Arni recorded an average annual temperature of 82°F. The hottest temperatures reached 105°F in April; the coolest were 62°F in January. Total precipitation for the year was 45 inches, with the wettest month being October.
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