About Fairmount, IN's Climate & Weather History

Fairmount is a city of approximately 2,900 people in Indiana, United States. Located in the America/Indiana/Indianapolis time zone at 40.4°N latitude.

In 2025, Fairmount recorded an average annual temperature of 52°F. The hottest temperatures reached 90°F in July; the coolest were -5°F in January. Total precipitation for the year was 33 inches, with the wettest month being April. Snowfall for the year totaled approximately 8 inches.