Marion County Climate
Marion County, Indiana
Avg Annual Temp
53.0°F
Annual Precip
43.2"
Annual Snowfall
23.1"
Extreme Heat Days
17.275
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Marion County Weather
A Stable National Median Climate
Marion County’s annual average of 52.9°F is very close to the median for the United States. Its 43.2 inches of annual precipitation is standard for the humid continental zone.
Slightly Warmer than State Average
At 52.9°F, the county is slightly warmer than the Indiana state average of 52.2°F. Urban development in Indianapolis likely contributes to this localized warmth.
Warmer Than Rural Northern Neighbors
Marion County is noticeably warmer than Lake or LaPorte counties to the north. It receives 23.1 inches of snow, which is more than its southern neighbor Lawrence.
Hot Summers and Snowy Winters
Summer brings 17 days of extreme heat over 90°F, the highest in the central region. Winter averages 30.8°F with over 23 inches of snowfall.
Plan for Urban Heat Extremes
Efficient air conditioning is a priority given the 17 extreme heat days. Residents should also keep snow shovels ready for the 23.1 inches of annual snowfall.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.