Chicago Weather in December
United States · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Chicago sees average temperatures ranging from a low of -2.2°C (28.0°F) to a high of 4.4°C (39.9°F), with a mean of 1.0°C (33.8°F). Compared to the annual average of 10.9°C (51.6°F), this month is 9.9°C cooler than the yearly norm. Precipitation averages 62.0mm, making it approximately 32.0mm drier than the monthly average of 94.0mm. The city receives an average of 4.7 hours of sunshine per day during December, with relative humidity averaging 75.3%. Wind speeds reach an average maximum of 25.2 km/h. Snowfall averages 5.6cm during December, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Chicago, with drier-than-average conditions compared to the rest of the year.
There's something about Chicago in January that reveals the city's true character. I visited during the polar vortex — minus 25°C, Lake Michigan frozen at the edges, and the locals still walked to their neighborhood taverns as if nothing was unusual. The cultural calendar thrives in winter: theaters full, restaurants cozy, museums uncrowded. Summer (June-August) is when Chicago reclaims its lakefront — 25°C, festivals every weekend, the energy electric. I love October: 14°C, the city in autumn colors, and a melancholy knowing winter is coming. Each season reveals a different Chicago.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 6.2°C (43.2°F) | 1.0°C (33.8°F) | -2.6°C (27.3°F) |
| Rainfall | 49.0mm | 62.0mm | 74.6mm |
| Sunshine | 6.4 hrs | 4.7 hrs | 4.4 hrs |
| Humidity | 71.7% | 75.3% | 78.3% |
| Wind | 26.4 km/h | 25.2 km/h | 25.8 km/h |
| Rainy Days | 9.4 | 10.2 | 7.2 |
| Snowfall | 3.5 cm | 5.6 cm | 27.6 cm |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Chicago in December, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Chicago in December?
The average temperature in Chicago during December ranges from -2.2°C (28.0°F) to 4.4°C (39.9°F), with a mean of 1.0°C (33.8°F).
How much does it rain in Chicago in December?
Chicago receives an average of 62.0mm of precipitation in December, spread across approximately 10.2 rainy days.
What should I pack for Chicago in December?
Based on December weather data, pack heavy winter clothing, thermal layers, and a warm coat.
Is December a good time to visit Chicago?
December is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Chicago
Cities with Similar December Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 41.88°, -87.63°. Timezone: America/Chicago. Last updated: 2026-07-30.