Chicago Loop, United States — Weather in December 2026

Monthly climate averages for Chicago Loop, United States. Based on 10-year ERA5 reanalysis data.

Cfa Humid Subtropical
1.6 /10
Poor

December is a poor month in Chicago Loop

Climate Overview

Chicago Loop, United States in December has cold conditions, with highs averaging around 3.2°C (38°F).

This month falls at the beginning of Winter. Cold conditions dominate the month.

Temperatures remain fairly steady throughout December, with daily highs around 4°C (39°F).

December sees fairly even rainfall, totalling about 60 mm across the month.

Expect around 5.6h of sunshine at the start of December, decreasing to 3.9h by the end.

The warmest days tend to fall around the 1th, averaging 4.4°C (40°F).

Compared to November, this month is about 5°C cooler with 0 fewer rainy days. Temperatures begin dropping heading into January.

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Monthly December Averages

Temperature
3°C / -2°C
Feels Like
-1°C / -7°C
Rain
8 days · 60 mm
Sunshine
5.1h / day
Humidity
74% — Humid
Wind
24 km/h
Wind Direction
WSW (249°)
Gusts
43 km/h
Daylight
9.2 h
Cloud Cover
72%
Clear Sky Days
1.8
UV Index
1.8 — Low
Dew Point
-3°C — Dry
Moon Phase
Waxing Crescent · 31%
Snow Days
7 days · 9.6 cm
Frost Days
18 days

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

12°C 9°C 6°C 3°C 0°C -3°C -6°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 151015202531
Rainfall

Daily Sunshine

0h 2h 4h 6h 8h 10h 151015202531
Sunshine

Daily Wind Speed

0 7 14 21 28 35 151015202531
Wind Speed
Sun Position
Sunrise 07:13
Daylight 9.2h
Sunset 16:22

What to Expect

Cold daytime highs of 3°C (38°F) mean shorter outdoor excursions with warming breaks.

Rain usually comes in shorter passing showers rather than all-day rain.

2 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

January
Poor
Temp
0°C / -5°C
Feels Like
-5°C / -11°C
Rain
9days (65 mm) Wet
Sun
5.2h Fair
Humidity
76% Humid
UV
2.1 Moderate
Snow Days
12days
View Details
February
Poor
Temp
2°C / -4°C
Feels Like
-3°C / -10°C
Rain
8days (53 mm) Wet
Sun
6.9h Fair
Humidity
73% Muggy
UV
3.4 Moderate
Snow Days
9days
View Details
March
Poor
Temp
7°C / 1°C
Feels Like
3°C / -4°C
Rain
11days (90 mm) Wet
Sun
7.9h Good
Humidity
73% Muggy
UV
4.6 Moderate
Snow Days
5days
View Details
April
Poor
Temp
11°C / 5°C
Feels Like
8°C / 0°C
Rain
13days (108 mm) Wet
Sun
9.1h Good
Humidity
73% Muggy
UV
5.5 High
Snow Days
3days
View Details
May
Good
Temp
17°C / 10°C
Feels Like
16°C / 7°C
Rain
13days (120 mm) Wet
Sun
10.4h Excellent
Humidity
77% Humid
UV
6.6 High
View Details
June best
Excellent
Temp
23°C / 17°C
Feels Like
25°C / 16°C
Rain
11days (101 mm) Wet
Sun
12h Excellent
Humidity
76% Humid
UV
7.1 Very High
View Details
July best
Excellent
Temp
26°C / 20°C
Feels Like
29°C / 21°C
Rain
11days (92 mm) Wet
Sun
12.1h Excellent
Humidity
78% Humid
UV
7.1 Very High
View Details
August best
Excellent
Temp
26°C / 20°C
Feels Like
28°C / 21°C
Rain
10days (78 mm) Wet
Sun
11.5h Excellent
Humidity
76% Humid
UV
6.6 High
View Details
September best
Excellent
Temp
23°C / 17°C
Feels Like
24°C / 17°C
Rain
9days (67 mm) Wet
Sun
9.7h Good
Humidity
74% Muggy
UV
5.3 High
View Details
October
Good
Temp
16°C / 11°C
Feels Like
14°C / 8°C
Rain
11days (105 mm) Wet
Sun
7.6h Good
Humidity
72% Muggy
UV
3.8 Moderate
Snow Days
1days
View Details
November
Poor
Temp
9°C / 4°C
Feels Like
5°C / -1°C
Rain
8days (57 mm) Wet
Sun
6.1h Fair
Humidity
71% Muggy
UV
2.5 Moderate
Snow Days
3days
View Details
December
Poor
Temp
3°C / -2°C
Feels Like
-1°C / -7°C
Rain
8days (60 mm) Wet
Sun
5.1h Fair
Humidity
74% Muggy
UV
1.8 Low
Snow Days
7days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 0°C / -5°C -5°C / -11°C 9days (65 mm) Wet 5.2h Fair 76% Humid 2.1 Moderate Poor View Details
February 2°C / -4°C -3°C / -10°C 8days (53 mm) Wet 6.9h Fair 73% Muggy 3.4 Moderate Poor View Details
March 7°C / 1°C 3°C / -4°C 11days (90 mm) Wet 7.9h Good 73% Muggy 4.6 Moderate Poor View Details
April 11°C / 5°C 8°C / 0°C 13days (108 mm) Wet 9.1h Good 73% Muggy 5.5 High Poor View Details
May 17°C / 10°C 16°C / 7°C 13days (120 mm) Wet 10.4h Excellent 77% Humid 6.6 High Good View Details
June best 23°C / 17°C 25°C / 16°C 11days (101 mm) Wet 12h Excellent 76% Humid 7.1 Very High Excellent View Details
July best 26°C / 20°C 29°C / 21°C 11days (92 mm) Wet 12.1h Excellent 78% Humid 7.1 Very High Excellent View Details
August best 26°C / 20°C 28°C / 21°C 10days (78 mm) Wet 11.5h Excellent 76% Humid 6.6 High Excellent View Details
September best 23°C / 17°C 24°C / 17°C 9days (67 mm) Wet 9.7h Good 74% Muggy 5.3 High Excellent View Details
October 16°C / 11°C 14°C / 8°C 11days (105 mm) Wet 7.6h Good 72% Muggy 3.8 Moderate Good View Details
November 9°C / 4°C 5°C / -1°C 8days (57 mm) Wet 6.1h Fair 71% Muggy 2.5 Moderate Poor View Details
December 3°C / -2°C -1°C / -7°C 8days (60 mm) Wet 5.1h Fair 74% Muggy 1.8 Low Poor View Details

What to Wear

Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Warm coatThermal base layersScarf & glovesUmbrellaComfortable walking shoes

Frequently Asked Questions

December is typically poor for visiting Chicago Loop, with average highs of 3°C (38°F) and around 8 rainy days. Chicago Loop, United States in December has cold conditions, with highs averaging around 3.2°C (38°F).
Chicago Loop typically sees around 8 rainy days in December with 60 mm (2.4 in) of total rainfall. An umbrella should suffice.
Yes, nights in Chicago Loop during December are cold, averaging -2°C (29°F). Pack warm layers and a coat for evenings.
With highs of 3°C (38°F) and lows of -2°C (29°F) in December, we recommend: Warm coat, Thermal base layers, Scarf & gloves, Umbrella, Comfortable walking shoes. Comfortable walking shoes are essential.
December is not the most favourable month weather-wise in Chicago Loop. Consider visiting during months with milder temperatures or less rainfall for a better experience.
The average UV index in Chicago Loop during December is 2 (low). No special sun protection is needed.
Chicago Loop gets approximately 9 hours of daylight per day in December, with around 5 hours of sunshine.
Yes, Chicago Loop typically sees around 7 snow days in December with roughly 10 cm (4 in) of snowfall.

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