Putnam County Climate
Putnam County, Illinois
Avg Annual Temp
51.0°F
Annual Precip
—
Annual Snowfall
—
Extreme Heat Days
29
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Precipitation data coming soon
Seasonal Overview
National Comparison
Data pending
Climate Profile
About Putnam County Weather
Cooler Northern Temperate Climate
Putnam County averages 51.0°F annually, which is cooler than the national median. This reflects a typical upper-Midwest profile where winter temperatures significantly influence the yearly average.
Below the Illinois Average
The county's 51.0°F annual average sits below the Illinois state average of 52.8°F. While precipitation and snowfall data are limited, its temperature profile suggests a classic northern Illinois environment.
Cooler than Southern Peers
Putnam is nearly 7 degrees cooler on average than southern counties like Pulaski. It records 29 days of extreme heat, which is fewer than Pike County but still indicates warm summer peaks.
Chilly Winters and Mild Summers
January is particularly cold with an average of 23.8°F, dragging the winter average down to 26.9°F. Summer provides relief with a July average of 74.8°F and 29 days reaching at least 90°F.
Focus on Winter Readiness
High-efficiency heating and proper insulation are the top priorities given the cold 23.8°F January average. Residents should also plan for nearly a month of extreme heat during the summer season.
Frequently Asked Questions
What is the average temperature in Putnam County?
How hot does Putnam County get in summer?
How cold are winters in Putnam County?
Track your own weather in Putnam County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.