Johnson County Climate
Johnson County, Indiana
Avg Annual Temp
51.6°F
Annual Precip
45.4"
Annual Snowfall
16.9"
Extreme Heat Days
17.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Johnson County Weather
Central Indiana's Continental Climate
Johnson County tracks an annual average of 51.6°F, which is slightly cooler than the national median. It experiences the classic humid continental climate of the central United States.
Reflecting the State Temperature Benchmark
The county sits just below the Indiana state average of 52.2°F. Its central location makes it a benchmark for the state's typical weather patterns.
Predictable Weather for the Metro Area
Its climate closely matches that of Marion and Shelby counties in the Indianapolis metro area. Precipitation levels of 45.4 inches are slightly above the state average of 43.9 inches.
Balanced Seasons with Moderate Snow
Summers feature 18 days of extreme heat and a July peak of 74.0°F. Winter brings 16.9 inches of snow and an average temperature of 29.4°F during the coldest months.
Prepare for a Balanced Climate
A dual-season HVAC approach is best for the 18 heat days and freezing winter nights. Residents should prepare for moderate snow accumulation that typically clears within a few days.
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.