Romulus, United States — Weather in December 2026

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

Cfa Humid Subtropical
1.4 /10
Poor

December is a poor month in Romulus

Climate Overview

Romulus, United States in December has cold conditions, with highs averaging around 3.5°C (38°F). Rain falls on about 10 days this month.

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).

Rainfall is heaviest during the last third of the month, while the first third tends to be drier.

Expect around 4.5h of sunshine at the start of December, decreasing to 3.5h by the end.

The warmest days tend to fall around the 1th, averaging 5.1°C (41°F).

Compared to November, this month is about 5°C cooler with 1 more rainy days. Temperatures begin dropping heading into January.

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Monthly December Averages

Temperature
4°C / -2°C
Feels Like
-1°C / -7°C
Rain
10 days · 58 mm
Sunshine
4.3h / day
Humidity
74% — Humid
Wind
20 km/h
Wind Direction
WSW (247°)
Gusts
40 km/h
Daylight
9.2 h
Cloud Cover
78%
Clear Sky Days
1
UV Index
1.7 — Low
Dew Point
-4°C — Dry
Moon Phase
Waxing Crescent · 31%
Snow Days
9 days · 10.5 cm
Frost Days
22 days

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

12°C 8°C 4°C 0°C -4°C -8°C -12°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 8 mm 151015202531
Rainfall

Daily Sunshine

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

Daily Wind Speed

0 6 12 18 24 30 151015202531
Wind Speed
Sun Position
Sunrise 07:57
Daylight 9.1h
Sunset 17:04

What to Expect

Cold daytime highs of 4°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
1°C / -5°C
Feels Like
-4°C / -10°C
Rain
9days (64 mm) Wet
Sun
4.6h Fair
Humidity
73% Muggy
UV
1.9 Low
Snow Days
10days
View Details
February
Poor
Temp
3°C / -5°C
Feels Like
-1°C / -10°C
Rain
8days (59 mm) Wet
Sun
6.6h Fair
Humidity
72% Muggy
UV
3.2 Moderate
Snow Days
9days
View Details
March
Poor
Temp
9°C / 0°C
Feels Like
5°C / -5°C
Rain
10days (78 mm) Wet
Sun
7.8h Good
Humidity
67% Muggy
UV
4.3 Moderate
Snow Days
5days
View Details
April
Fair
Temp
14°C / 4°C
Feels Like
11°C / 0°C
Rain
12days (89 mm) Wet
Sun
9h Good
Humidity
67% Muggy
UV
5.5 High
Snow Days
3days
View Details
May
Good
Temp
20°C / 11°C
Feels Like
20°C / 9°C
Rain
13days (93 mm) Wet
Sun
10h Excellent
Humidity
70% Muggy
UV
6.2 High
View Details
June best
Excellent
Temp
26°C / 17°C
Feels Like
27°C / 16°C
Rain
11days (84 mm) Wet
Sun
11.8h Excellent
Humidity
67% Muggy
UV
6.8 High
View Details
July best
Excellent
Temp
28°C / 19°C
Feels Like
30°C / 20°C
Rain
12days (102 mm) Wet
Sun
11.9h Excellent
Humidity
70% Muggy
UV
7 High
View Details
August best
Excellent
Temp
27°C / 18°C
Feels Like
29°C / 19°C
Rain
10days (77 mm) Wet
Sun
11.4h Excellent
Humidity
70% Muggy
UV
6.4 High
View Details
September best
Excellent
Temp
24°C / 16°C
Feels Like
24°C / 15°C
Rain
9days (60 mm) Wet
Sun
9.3h Good
Humidity
72% Muggy
UV
5.1 High
View Details
October
Good
Temp
17°C / 9°C
Feels Like
15°C / 7°C
Rain
11days (81 mm) Wet
Sun
7.2h Good
Humidity
71% Muggy
UV
3.7 Moderate
View Details
November
Poor
Temp
9°C / 2°C
Feels Like
5°C / -2°C
Rain
9days (58 mm) Wet
Sun
5.8h Fair
Humidity
72% Muggy
UV
2.3 Moderate
Snow Days
5days
View Details
December
Poor
Temp
4°C / -2°C
Feels Like
-1°C / -7°C
Rain
10days (58 mm) Wet
Sun
4.3h Fair
Humidity
74% Muggy
UV
1.7 Low
Snow Days
9days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 1°C / -5°C -4°C / -10°C 9days (64 mm) Wet 4.6h Fair 73% Muggy 1.9 Low Poor View Details
February 3°C / -5°C -1°C / -10°C 8days (59 mm) Wet 6.6h Fair 72% Muggy 3.2 Moderate Poor View Details
March 9°C / 0°C 5°C / -5°C 10days (78 mm) Wet 7.8h Good 67% Muggy 4.3 Moderate Poor View Details
April 14°C / 4°C 11°C / 0°C 12days (89 mm) Wet 9h Good 67% Muggy 5.5 High Fair View Details
May 20°C / 11°C 20°C / 9°C 13days (93 mm) Wet 10h Excellent 70% Muggy 6.2 High Good View Details
June best 26°C / 17°C 27°C / 16°C 11days (84 mm) Wet 11.8h Excellent 67% Muggy 6.8 High Excellent View Details
July best 28°C / 19°C 30°C / 20°C 12days (102 mm) Wet 11.9h Excellent 70% Muggy 7 High Excellent View Details
August best 27°C / 18°C 29°C / 19°C 10days (77 mm) Wet 11.4h Excellent 70% Muggy 6.4 High Excellent View Details
September best 24°C / 16°C 24°C / 15°C 9days (60 mm) Wet 9.3h Good 72% Muggy 5.1 High Excellent View Details
October 17°C / 9°C 15°C / 7°C 11days (81 mm) Wet 7.2h Good 71% Muggy 3.7 Moderate Good View Details
November 9°C / 2°C 5°C / -2°C 9days (58 mm) Wet 5.8h Fair 72% Muggy 2.3 Moderate Poor View Details
December 4°C / -2°C -1°C / -7°C 10days (58 mm) Wet 4.3h Fair 74% Muggy 1.7 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 & glovesUmbrellaWaterproof jacketComfortable walking shoes

Frequently Asked Questions

December is typically poor for visiting Romulus, with average highs of 4°C (38°F) and around 10 rainy days. Romulus, United States in December has cold conditions, with highs averaging around 3.5°C (38°F). Rain falls on about 10
Romulus typically sees around 10 rainy days in December with 58 mm (2.3 in) of total rainfall. An umbrella should suffice.
Yes, nights in Romulus during December are cold, averaging -2°C (28°F). Pack warm layers and a coat for evenings.
With highs of 4°C (38°F) and lows of -2°C (28°F) in December, we recommend: Warm coat, Thermal base layers, Scarf & gloves, Umbrella, Waterproof jacket. Comfortable walking shoes are essential.
December is not the most favourable month weather-wise in Romulus. Consider visiting during months with milder temperatures or less rainfall for a better experience.
The average UV index in Romulus during December is 2 (low). No special sun protection is needed.
Romulus gets approximately 9 hours of daylight per day in December, with around 4 hours of sunshine.
Yes, Romulus typically sees around 9 snow days in December with roughly 11 cm (4 in) of snowfall.

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