December Weather in Chicago, United States

Last updated: February 24, 2025

December in Chicago showcases a captivating mix of winter elements, with temperatures ranging from a maximum of 18°C (64°F) to a chilling minimum of -19°C (-2°F). The average temperature hovers around 1°C (34°F), setting a brisk tone for the month. Residents and visitors alike should prepare for 63 mm (2.5 in) of precipitation, which typically occurs over 8 days, adding a layer of moisture to the air with an 84% humidity level. As the city dons its icy coat, December in Chicago offers a unique blend of cold beauty and festive spirit.

December Temperature in Chicago

In Chicago, December heralds the onset of winter, bringing a distinct chill to the air. With minimum temperatures dipping to a brisk -19°C (-2°F) and average highs around 1°C (34°F), the city experiences a stark contrast to the milder months preceding it. The transition from fall is apparent as the average temperatures plummet, yet there are occasional reprieves with maximums reaching up to 18°C (64°F). This month sets the stage for the cold ahead, painting a picture of a city bracing for the deep freeze of January and February, while still allowing for a few warm breaths of late-year reprieve. As the snow begins to blanket the streets, Chicago’s winter charm unfolds, inviting residents and visitors alike to embrace the season's crisp beauty.

December Weather in Chicago: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Chicago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec272939475970747368554034
Data source: Temperature data for Chicago generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Chicago

As December settles in Chicago, the city experiences a brief dip in precipitation, recording 63 mm (2.5 in) over 8 days—the second lowest for the year. This slight decrease from November's 65 mm (2.6 in) signals the onset of winter, where the bustling autumn showers give way to a more serene, if sometimes chilly, ambiance. The pattern of rainfall shows a notable contrast as the year progresses, peaking in May with 156 mm (6.1 in) during its most vibrant season. While December might not bring heavy rains, the transition into winter introduces unique weather conditions that wrap the city in a tranquil, frosty charm.

December Precipitation Trends in Chicago

The chart displays monthly precipitation patterns in Chicago, with values for each month alongside December's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec68709512515614410484781426563
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Chicago

In December, Chicago experiences a notable shift in humidity, maintaining an average of 84%. This figure reflects a slight decrease from November's peak of 88%, which is typically the most humid month of the year. Throughout the year, humidity levels in the Windy City gradually increase, peaking from late winter into spring, with March and April reaching 84% and 85%, respectively. Notably, December's humidity is lower than the early months, hinting at a transition as the city braces for the chill of winter. As the year ends, Chicagoans can expect a final splash of moisture before the coldest months, making December a bridge between the high humidity of late fall and the drier conditions that typically follow.

December Average Humidity in Chicago

This chart illustrates the average monthly humidity levels in Chicago, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Chicago

As winter settles in Chicago, December brings a notable dip in the UV Index, measuring only 2, which aligns with a low exposure category. This means residents can enjoy the crisp outdoor air with a safer burn time of 45 minutes before sun protection becomes necessary. The trend throughout the year showcases a significant rise in UV exposure from January's moderate levels at 3, peaking at 10 during the summer months of June and July, before gradually decreasing back to low levels by December. This seasonal variation emphasizes the importance of adapting sun safety practices throughout the year. For more detailed information, check out Chicago UV Index.

Maximum UV Index Levels in Chicago for December

The chart shows the monthly maximum UV Index (UVI) for Chicago in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Chicago December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in Chicago

December in Chicago sees a gentle decline in sunshine hours, offering 177 hours of sunlight as the year draws to a close. This marks a contrast to the brighter summer months, such as July, which enjoys a peak of 362 hours. The trend reveals a gradual increase in daylight leading up to the summer, culminating in a vivid burst of sunshine before tapering off again in autumn. Notably, December's sunshine serves as a comforting reprieve from the cold winter months ahead, perfectly encapsulating the city's transition from the vibrant energy of summer to the introspective chill of winter. While it doesn’t rival the peak summer days, December’s sunlight still provides a vital source of warmth and cheer as the days grow shorter.

Monthly Sunshine Duration in Chicago: December Highlighted

The December sunshine duration represents the total number of hours Chicago experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec116h175h232h251h290h332h362h340h288h228h190h177h
Data source: Chicago December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chicago During December

As December rolls into Chicago, residents can expect a 35% chance of sunny weather, marking a slight decrease from the previous month’s 44%. This data showcases a gradual, albeit fluctuating, pattern of sunshine throughout the year, with winter months typically yielding less sunlight compared to the brighter spring and summer seasons. The trend indicates that while December’s likelihood of sunny days is modest, it still outshines the bleak winters of January, which sits at 23%. This gradual transition from the fall's more vibrant months offers a glimpse of hope for those yearning for sunlight amid the chilly winds and snowy backdrops.

Percentage of Sunny Days in December in Chicago

The chart illustrates the percentage of sunny days in Chicago throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Chicago experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec23%30%46%39%34%43%44%47%56%33%44%35%
Data source: Chicago December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chicago in December

December in Chicago marks a time of shorter days, as daylight duration dips to 9 hours, mirroring the daylight seen in November. As the year progresses from the sunniest months of June and July, with 15 and 14 hours of daylight respectively, the shift towards winter becomes evident. The increasing darkness during the late fall and winter months underscores a significant decline in sunlight, creating cozy atmospheres perfect for the holiday season. This seasonal pattern highlights the transition from the vibrant light of spring and summer to the subdued glow of winter, inviting Chicagoans to embrace the charm of the colder days and the festive spirit they bring.

Average Daylight Hours in Chicago for December

The chart illustrates the variation in daylight duration in Chicago throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 31m10h 35m11h 58m13h 22m14h 33m15h 9m14h 49m13h 46m12h 25m11h 1m9h 48m9h 10m
Data source: Chicago daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Chicago

As December descends upon Chicago, the city feels the brisk embrace of winter winds, with an average wind speed of 4.7 m/s (10 mph). This reflects a noticeable increase compared to the calmer summer months, where wind speeds dipped to around 3.3 m/s (7 mph) in July and just 3.0 m/s (7 mph) in August. Interestingly, December's gusts are comparable to the slightly windier November, which averaged 4.8 m/s (11 mph). This seasonal shift marks a gradual trend of escalating wind speeds leading into winter, moving from the gentler breezes of early summer and signaling the arrival of colder temperatures and the festive spirit of the holiday season in the Windy City.

Average December Wind Speed in Chicago

The chart displays monthly wind speed patterns in Chicago, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.74.94.03.93.53.33.04.14.04.84.7 m/s
Data source: Chicago December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Chicago Compares to Other Months

The weather in Chicago changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Chicago and find detailed weather information for every month.

December and January present notably different weather conditions. In December, the temperatures range from a minimum of -19°C (-2°F) to a maximum of 18°C (64°F), with an average of 1°C (34°F) and relatively high humidity at 84%. Precipitation is moderate, occurring on about 8 days and totaling 63 mm (2.5 in). In contrast, January is colder, with a minimum temperature of -29°C (-21°F) and an average of -3°C (27°F), though the maximum temperature remains at a milder 14°C (57°F). Precipitation increases slightly to 68 mm (2.7 in) over 9 days, and humidity drops slightly to 82%. For more detailed information, check Chicago weather in January.

In December, temperatures typically range from a minimum of -19°C (-2°F) to an average of 1°C (34°F), reaching a maximum of 18°C (64°F). The month sees about 63 mm (2.5 in) of precipitation over approximately 8 days, with a humidity level of 84%. In contrast, February experiences colder conditions, with a minimum temperature dropping to -30°C (-22°F) and an average of -2°C (29°F), while still reaching the same maximum of 18°C (64°F). Precipitation increases slightly to 70 mm (2.7 in), distributed over about 12 days, and the humidity remains relatively stable at 83%. For more detailed insights, you can check Chicago weather in February.

December and March showcase contrasting weather patterns, despite their proximity in the calendar year. In December, temperatures typically range from a minimum of -19°C (-2°F) to an average of 1°C (34°F), with a maximum reaching 18°C (64°F). The month experiences about 63 mm (2.5 in) of precipitation over 8 days, all while maintaining a high humidity level of 84%. In contrast, March sees a slight increase in average temperature to around 4°C (39°F), with minimums at -18°C (-1°F) and a maximum of 23°C (74°F). Precipitation rises to 95 mm (3.7 in) and occurs across 11 days, with humidity remaining constant at 84%. This shift indicates a gradual transition toward milder weather as winter gives way to spring. For more details, you can check Chicago weather in March.

December and April exhibit contrasting weather patterns, reflecting the seasonal transition from winter to spring. In December, temperatures range from a chilly -19°C (-2°F) to a maximum of 18°C (64°F), with an average of just 1°C (34°F). The month experiences about 63 mm (2.5 in) of precipitation over approximately 8 days, coupled with high humidity at 84%. On the other hand, April offers a milder climate with temperatures that range from a minimum of -6°C (22°F) to a warm 26°C (79°F), averaging 8°C (47°F). April also sees increased precipitation at 125 mm (4.9 in) spread over 13 days, with humidity slightly higher at 85%. For more detailed insights about the weather during this month, check out Chicago weather in April.

December and May present striking contrasts in weather. In December, temperatures can drop as low as -19°C (-2°F), with an average temperature around 1°C (34°F) and occasional highs reaching 18°C (64°F). The month experiences about 63 mm (2.5 in) of precipitation spread over 8 days, and humidity levels are relatively high at 84%. In contrast, May enjoys milder temperatures with a minimum of -1°C (31°F), an average of 15°C (59°F), and peaks reaching up to 32°C (90°F). While May sees significantly more precipitation at 156 mm (6.1 in) over 15 days, the humidity is slightly lower at 79%. For more details on May weather in Chicago, you can visit Chicago weather in May.

December and June present stark contrasts in weather conditions. In December, temperatures can dip as low as -19°C (-2°F), with an average temperature of around 1°C (34°F) and a maximum of 18°C (64°F). This month experiences about 63 mm (2.5 in) of precipitation across 8 days, coupled with high humidity levels at 84%. In contrast, June boasts much more favorable weather, with minimum temperatures starting at 10°C (50°F) and averaging 21°C (70°F), reaching up to 33°C (91°F). Precipitation in June increases to 144 mm (5.7 in) over 13 days, while humidity remains slightly lower at 82%. For a detailed overview, you can check out Chicago weather in June.

December and July present contrasting weather patterns, with December experiencing significantly colder temperatures, ranging from a minimum of -19°C (-2°F) to a maximum of 18°C (64°F). The average temperature hovers around 1°C (34°F), along with high humidity at 84%. In terms of precipitation, December sees about 63 mm (2.5 in) over approximately 8 days. On the other hand, July boasts a much warmer climate, with temperatures varying from a minimum of 14°C (58°F) to a maximum of 33°C (92°F) and an average of 24°C (75°F). The month also receives more rainfall, totaling 104 mm (4.1 in) over about 12 days, coupled with slightly lower humidity at 80%. For more details, you can check out Chicago weather in July.

When comparing December and August weather, there is a stark contrast in temperature and precipitation patterns. December typically experiences much colder conditions, with average temperatures around 1°C (34°F) and a minimum that can plummet to -19°C (-2°F). In contrast, August enjoys warmer weather, with average temperatures reaching 23°C (73°F) and highs soaring up to 33°C (92°F). Precipitation is slightly higher in August at 84 mm (3.3 in) over 11 days, compared to December's 63 mm (2.5 in) across 8 days. Humidity levels remain relatively close, at 84% in December and 81% in August, but the cooler winter air in December makes the humidity feel more biting. For more detailed weather information, you can visit Chicago weather in August.

In comparing the weather between September and December, several notable differences emerge. December experiences much colder temperatures, with averages hovering around 1°C (34°F) and minimums plunging to -19°C (-2°F), while September enjoys a milder climate with average temperatures of 20°C (68°F) and highs reaching up to 32°C (90°F). Additionally, December sees about 63 mm (2.5 in) of precipitation over 8 days, in contrast to September, which has slightly higher precipitation at 78 mm (3.1 in) over 9 days. Despite the increased rainfall in September, the overall humidity remains somewhat similar, with December at 84% and September at 80%. For more information on September weather, you can visit Chicago weather in September.

When comparing the weather in December and October, notable differences emerge. December often experiences colder extremes with temperatures ranging from a minimum of -19°C (-2°F) to a maximum of 18°C (64°F), resulting in an average temperature of just 1°C (34°F). In contrast, October offers milder conditions, with temperatures ranging from a minimum of -1°C (31°F) to a warm maximum of 29°C (85°F), leading to a much more comfortable average of 13°C (55°F).

Additionally, December sees about 63 mm (2.5 in) of precipitation over 8 days, while October is significantly wetter, with 142 mm (5.6 in) falling over 13 days. Humidity levels are quite similar, at 84% for December and 82% for October. For more detailed insights into the weather patterns during this month, check out Chicago weather in October.

December weather in Chicago tends to be colder than in November, with average temperatures dropping from 4°C (40°F) in November to 1°C (34°F) in December. The minimum recorded temperatures also decrease, with December reaching as low as -19°C (-2°F), compared to November's minimum of -14°C (6°F). Although both months experience similar levels of precipitation—around 63 mm (2.5 in) in December and 65 mm (2.6 in) in November—December is slightly wetter in terms of total humidity, hovering around 84% compared to November's 88%. For more details, you can check Chicago weather in November.

Compare Chicago's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Chicago

As December settles over Chicago, the city's weather takes a dramatic turn, contrasting sharply with the milder months preceding it. Temperatures plunge, often experiencing bitter lows that can dip to -19°C (-2°F), setting the stage for a truly wintry atmosphere. While average highs might reach a mild 18°C (64°F), the chill of the season prevails, accompanied by higher humidity levels of approximately 84%. This month also brings about a notable increase in precipitation, with about 63 mm (2.5 in) falling over an average of 8 days, hinting at the arrival of snowflakes that blanket the city in white. For more insights into the shifts in weather patterns throughout the year, be sure to explore Chicago Climate.