Marion County Climate
Marion County, Indiana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.9°F
Annual Precip
43.2"
Annual Snowfall
23.1"
Extreme Heat Days
17
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,580
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Marion County
Climate Verdict
Marion County has a mild, with an average annual temperature of 52.9°F, moderately wet with 43.2 inches of annual precipitation, rare extreme heat with only 17.275 days above 90°F annually, moderate snowfall of 23.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.9°F. summers are warm — July averages 75.2°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Marion County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Marion County closely matches the Indiana statewide average temperature of 52.4°F.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.