Chicago Weather in December

🇺🇸 United States

2°C

High

-3°C

Low

Rain Days

Sunshine

65%

Humidity

North America › 🇺🇸 United States › Chicago

Updated: March 2026

Is December a Good Time to Visit Chicago?

2/10

Avoid

December is a avoid time to visit Chicago (2/10). Average highs of 2°C and 5 sunshine hours daily make conditions workable, though not exceptional. December suits travellers visiting for indoor culture, food, and architecture rather than outdoor activities. Pack accordingly for 9 potential rain days. January offers a similar profile at lower hotel rates if dates are flexible. The 2°C highs require proper cold-weather clothing; many visitors underestimate how far the wind chill drops the perceived temperature, particularly near water or at elevated viewpoints. Planning tips: most accommodation categories have availability, and last-minute deals are common. The quieter streets and shorter queues can make this a genuinely enjoyable time to visit for the right type of traveller. Budget-conscious visitors will find the best value of the year in this period.

vs November:8°C avg high

December weather in Chicago is defined by a daily temperature swing from -3°C at night to 2°C during the afternoon. Humidity averages 65%, and you can count on around 5 sunshine hours each day. That combination makes December warm and lush, though dressing in breathable fabrics keeps things manageable.

2°C

Avg High

-3°C

Avg Low

9 days

Rain Days

Sunshine

65%

Humidity

Temperature in Chicago in December

The narrow 5°C gap between daytime and overnight temperatures, characteristic of coastal cities with maritime moderation, means a single mid-layer works across the whole day. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. The UV index of 1 is low, meaning sun exposure is minimal concern and sunscreen is largely optional. Wind averages 25 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 36°F average high, 27°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in December

Monthly Precipitation (mm)

What to Wear in Chicago in December

Morning-3°CBefore the day warms up

Afternoon2°CPeak daytime temperature

Evening0°CAfter sunset cools down

Packing for Chicago in December means dressing for 2°C days and -3°C evenings. Layering is key: a thermal base, mid-layer fleece, and a windproof outer jacket for 2°C highs that feel colder in the wind. Evening temperatures settle at -3°C, a modest 5°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. A compact foldable umbrella weighs almost nothing and earns its keep across 9 potential rainy days.

💡

Local tip: Chicago's 2°C days warm significantly in direct sunshine. A removable outer layer you can tie around your waist handles the midday warmth without leaving you cold on shaded streets or in the evening.

Events in Chicago in December

December has no major festivals or public holidays in Chicago, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Chicago in December

Based on 2°C average highs and 9 rainy days

Heavy winter coat (rated below -5°C)
Thermal underlayers in merino wool or moisture-wicking synthetic
Insulated, waterproof boots
Wool hat, thick gloves, and a windproof scarf
Compact folding umbrella
Waterproof outer layer or packable rain jacket
Quick-dry clothing that recovers fast after a shower
Comfortable walking shoes (a second pair lets the first air out overnight)
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Chicago in December

Vigorous walking tour of the UNESCO heritage districtMidday (12-2pm)The 2°C peak temperature provides ideal conditions for brisk sightseeing walks
Cycling the riverside or park circuitAfternoon (1-4pm)Cool dry air makes long cycling sessions comfortable without overheating
Explore hilltop viewpoints and fortressesMorning for clear viewsCold-weather atmospheric clarity gives the longest sightlines of the year
Open-air Christmas or seasonal marketsAfternoon into eveningCool temperatures make festive outdoor markets genuinely atmospheric
Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningDecember brings distinct seasonal changes to public green spaces worth exploring
Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months

Why is Chicago cool in December?

In December, Chicago feels the full influence of the continental polar air mass, which dominates mid-latitude interiors during winter. Cold, dry air from the north suppresses temperatures to 2°C during the day, dropping further to -3°C at night when radiative cooling is greatest. Precipitation tends to be low, as the cold air holds little moisture. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Chicago in December

In December, Chicago experiences average highs of 2°C (36°F) and lows of -3°C (27°F). Expect around 9 rainy days and 5 hours of sunshine per day, with humidity averaging 65%. The 5°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV exposure is moderate at index 1.

Chicago typically sees 9 rainy days in December, with total precipitation of around 59mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Chicago typically sees 4-6 fewer rain days than December.

Pack a heavy winter coat, thermal underlayers, waterproof insulated boots, and accessories including hats, gloves, and a scarf for Chicago in December. Temperatures regularly fall to -3°C and rarely climb above 2°C during the day. Layering is the key strategy: a base layer, mid-layer insulation, and a windproof outer shell provide flexibility as you move between heated indoor spaces and cold outdoor streets.

December is a reasonable time to visit Chicago. Expect 9 rainy days, so pack a light rain layer for flexibility. Average temperatures of 2°C make outdoor exploration comfortable during the dry periods. With 5 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.

The average high temperature in Chicago in December is 2°C (36°F), and the average low is -3°C (27°F). The mean daily temperature is approximately 0°C (31°F). The day-to-night range of 5°C is narrow, typical of coastal or maritime cities. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.

The best month to visit Chicago is generally July. July offers the most sunshine at 12 hours per day and only 11 rainy days. Average temperatures reach 27°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around July gives you the best chance of dry, bright weather.

December is shoulder or low season in Chicago, meaning fewer tourists and generally lower prices than peak months. With 5 sunshine hours and 9 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.

In December, Chicago suits a range of activities thanks to cold temperatures of 2°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. Cosy cafes and cultural venues make ideal retreats on overcast days.

December ranks 12th sunniest of the year in Chicago, with an average 5 daily sunshine hours. The driest months are February, January, and September. July is the hottest month (27°C avg high); January is the coolest (-1°C). From here, temperatures fall 3°C into January. Compared to last month (November: 8°C high, 9 rain days), December is cooler and equally dry. December is one of the least sunny months, but that often means lower prices and fewer fellow tourists.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	-1°C	-7°C	9	6h	View
February	1°C	-6°C	7	7h	View
March	5°C	-2°C	10	8h	View
April	11°C	4°C	12	9h	View
May	18°C	11°C	13	11h	View
June	24°C	18°C	12	12h	View
July	27°C	21°C	11	12h	View
August	26°C	20°C	11	12h	View
September	22°C	16°C	9	10h	View
October	16°C	10°C	9	8h	View
November	8°C	3°C	9	6h	View
December	2°C	-3°C	9	5h	View

Other Months in Chicago

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Chicago

Best Time to Visit Chicago

Data Sources for Chicago

Chicago on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.