Best Time to Run in Chicago in December

The verdict: Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.

Chicago · December

Run in the midday.

Cold: average high 39°F, low 28°F. Layering becomes the workout. Humidity averages 75% — the limiting factor on most runs. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.

Avg high / low
39° / 28°F
Humidity
75%
Rain days
11/mo
Wind
16 mph

What December feels like in Chicago

Sunrise

08:10

Mid-month average

Sunset

17:22

Mid-month average

Time-of-day breakdown

Morning

Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.

Midday

Often the warmest few hours of a cold day. If you can only run once, midday gives you the most temperate window.

Evening

Cold drops back in fast after sunset. Tight window — done before headlamp territory.

What to wear running in Chicago in December

The kit for December in Chicago: cold-weather layers, gloves, and ear coverage on most mornings, a wind-blocking layer for exposed routes.

December vs the surrounding months

Frequently Asked Questions

What is the best time of day to run in Chicago in December?+
Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
What's the average temperature in Chicago in December?+
Average high 39°F, average low 28°F.
How does December compare to surrounding months in Chicago?+
Compared to November (avg high 47°F), December is cooler. Compared to January (avg high 31°F), December is warmer.
Does it rain often in Chicago in December?+
Expect about 11 measurable rain days in December, on average.

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