Grafton, United States — Weather in December 2026

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

Cfa Humid Subtropical
1.3 /10
Poor

December is a poor month in Grafton

Climate Overview

Grafton, United States in December has cold conditions, with highs averaging around 4.2°C (40°F). Rain falls on about 11 days this month.

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

Daily highs in December gradually drop from around 6°C (43°F) at the start to 4°C (38°F) by month's end.

December sees fairly even rainfall, totalling about 124 mm across the month.

Expect around 5.9h of sunshine at the start of December, decreasing to 4.7h by the end.

The warmest days tend to fall around the 1th, averaging 6.7°C (44°F).

Compared to November, this month is about 6°C cooler with 2 more rainy days.

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Monthly December Averages

Temperature
4°C / -3°C
Feels Like
0°C / -7°C
Rain
11 days · 124 mm
Sunshine
5.5h / day
Humidity
72% — Humid
Wind
19 km/h
Wind Direction
W (275°)
Gusts
43 km/h
Daylight
9.2 h
Cloud Cover
58%
Clear Sky Days
4.8
UV Index
1.9 — Low
Dew Point
-4°C — Dry
Moon Phase
Waxing Crescent · 31%
Snow Days
7 days · 21.4 cm
Frost Days
23 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
High Low

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 8 mm 10 mm 151015202531
Rainfall

Daily Sunshine

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

Daily Wind Speed

0 6 12 18 24 30 151015202531
Wind Speed
Sun Position
Sunrise 07:08
Daylight 9.1h
Sunset 16:15

What to Expect

Cold daytime highs of 4°C (40°F) mean shorter outdoor excursions with warming breaks.

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

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

Compare Months

January
Poor
Temp
2°C / -5°C
Feels Like
-2°C / -10°C
Rain
10days (91 mm) Wet
Sun
5.9h Fair
Humidity
68% Muggy
UV
2.2 Moderate
Snow Days
10days
View Details
February
Poor
Temp
4°C / -4°C
Feels Like
0°C / -9°C
Rain
9days (84 mm) Wet
Sun
6.8h Fair
Humidity
70% Muggy
UV
3.3 Moderate
Snow Days
9days
View Details
March
Poor
Temp
8°C / -1°C
Feels Like
4°C / -6°C
Rain
11days (100 mm) Wet
Sun
7.9h Good
Humidity
66% Muggy
UV
4.3 Moderate
Snow Days
6days
View Details
April
Fair
Temp
14°C / 4°C
Feels Like
11°C / 0°C
Rain
12days (108 mm) Wet
Sun
8.4h Good
Humidity
68% Muggy
UV
5.1 High
Snow Days
2days
View Details
May
Good
Temp
20°C / 10°C
Feels Like
19°C / 8°C
Rain
13days (99 mm) Wet
Sun
9.4h Good
Humidity
72% Muggy
UV
6.1 High
View Details
June best
Excellent
Temp
25°C / 15°C
Feels Like
26°C / 15°C
Rain
12days (87 mm) Wet
Sun
10.8h Excellent
Humidity
71% Muggy
UV
6.8 High
View Details
July best
Excellent
Temp
28°C / 19°C
Feels Like
30°C / 20°C
Rain
13days (122 mm) Wet
Sun
11h Excellent
Humidity
73% Muggy
UV
6.9 High
View Details
August best
Excellent
Temp
27°C / 18°C
Feels Like
29°C / 19°C
Rain
11days (99 mm) Wet
Sun
10.5h Excellent
Humidity
73% Muggy
UV
6.4 High
View Details
September best
Excellent
Temp
23°C / 15°C
Feels Like
23°C / 14°C
Rain
9days (99 mm) Wet
Sun
8.5h Good
Humidity
76% Humid
UV
5.1 High
View Details
October best
Good
Temp
17°C / 9°C
Feels Like
15°C / 7°C
Rain
10days (108 mm) Wet
Sun
6.9h Fair
Humidity
76% Humid
UV
3.8 Moderate
View Details
November
Poor
Temp
10°C / 2°C
Feels Like
6°C / -2°C
Rain
9days (81 mm) Wet
Sun
6.5h Fair
Humidity
71% Muggy
UV
2.7 Moderate
Snow Days
2days
View Details
December
Poor
Temp
4°C / -3°C
Feels Like
0°C / -7°C
Rain
11days (124 mm) Wet
Sun
5.5h Fair
Humidity
72% Muggy
UV
1.9 Low
Snow Days
7days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 2°C / -5°C -2°C / -10°C 10days (91 mm) Wet 5.9h Fair 68% Muggy 2.2 Moderate Poor View Details
February 4°C / -4°C 0°C / -9°C 9days (84 mm) Wet 6.8h Fair 70% Muggy 3.3 Moderate Poor View Details
March 8°C / -1°C 4°C / -6°C 11days (100 mm) Wet 7.9h Good 66% Muggy 4.3 Moderate Poor View Details
April 14°C / 4°C 11°C / 0°C 12days (108 mm) Wet 8.4h Good 68% Muggy 5.1 High Fair View Details
May 20°C / 10°C 19°C / 8°C 13days (99 mm) Wet 9.4h Good 72% Muggy 6.1 High Good View Details
June best 25°C / 15°C 26°C / 15°C 12days (87 mm) Wet 10.8h Excellent 71% Muggy 6.8 High Excellent View Details
July best 28°C / 19°C 30°C / 20°C 13days (122 mm) Wet 11h Excellent 73% Muggy 6.9 High Excellent View Details
August best 27°C / 18°C 29°C / 19°C 11days (99 mm) Wet 10.5h Excellent 73% Muggy 6.4 High Excellent View Details
September best 23°C / 15°C 23°C / 14°C 9days (99 mm) Wet 8.5h Good 76% Humid 5.1 High Excellent View Details
October best 17°C / 9°C 15°C / 7°C 10days (108 mm) Wet 6.9h Fair 76% Humid 3.8 Moderate Good View Details
November 10°C / 2°C 6°C / -2°C 9days (81 mm) Wet 6.5h Fair 71% Muggy 2.7 Moderate Poor View Details
December 4°C / -3°C 0°C / -7°C 11days (124 mm) Wet 5.5h Fair 72% Muggy 1.9 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 Grafton, with average highs of 4°C (40°F) and around 11 rainy days. Grafton, United States in December has cold conditions, with highs averaging around 4.2°C (40°F). Rain falls on about 11
Grafton typically sees around 11 rainy days in December with 124 mm (4.9 in) of total rainfall. Pack a waterproof jacket.
Yes, nights in Grafton during December are cold, averaging -3°C (27°F). Pack warm layers and a coat for evenings.
With highs of 4°C (40°F) and lows of -3°C (27°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 Grafton. Consider visiting during months with milder temperatures or less rainfall for a better experience.
The average UV index in Grafton during December is 2 (low). No special sun protection is needed.
Grafton gets approximately 9 hours of daylight per day in December, with around 6 hours of sunshine.
Yes, Grafton typically sees around 7 snow days in December with roughly 21 cm (8 in) of snowfall.

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