January Weather in Grafton, United States

Last updated: June 24, 2025

In January, the average temperature in Grafton, United States hovers around -6°C (22°F). While chilly nights can plunge to a frosty -30°C (-21°F), daytime highs may reach a pleasant 15°C (59°F). Expect 70 mm (2.8 in) of precipitation spread across 9 days, resulting in a relatively high average humidity of 86%.

January Temperature in Grafton

In January in Grafton, the average temperature is -6°C (22°F). Maximum temperatures can reach 15°C (59°F), while minimums can dip as low as -30°C (-21°F). Be prepared for a wide range of temperatures when traveling during this time.

January Weather in Grafton: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Grafton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grafton, January typically has an average temperature of -6°C (22°F), with highs reaching up to 15°C (59°F) and lows dropping to around -30°C (-21°F).

Data source: Temperature data for Grafton generated using information from the Copernicus Climate Change Service.

January Precipitation in Grafton

In Grafton in January, the total precipitation amount is 70 mm (2.8 in) spread over 9 days.

January Precipitation Trends in Grafton

The chart displays monthly precipitation patterns in Grafton, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Grafton, January typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Grafton

In Grafton in January humidity is 86%. With an average temperature of -6°C (22°F), this humidity feels like an intense chill that cuts through layers of clothing, making travel uncomfortable and prompting the need for extra warmth and careful planning for outdoor activities.

January Average Humidity in Grafton

This chart illustrates the average monthly humidity levels in Grafton, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Grafton is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Grafton

In Grafton in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Grafton, you can check the information here.

Maximum UV Index Levels in Grafton for January

The chart shows the monthly maximum UV Index (UVI) for Grafton in January, 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. In January, the maximum UV index in Grafton typically reaches 3, which falls under the moderate exposure category.

Data source: Grafton January 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.

How January Weather in Grafton Compares to Other Months

Weather in Grafton varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Grafton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Grafton, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	70 mm (2.8 inches)	86%	moderate
February Weather	-4°C (25°F)	82 mm (3.2 inches)	84%	moderate
March Weather	0°C (32°F)	75 mm (2.9 inches)	82%	moderate
April Weather	6°C (44°F)	121 mm (4.8 inches)	80%	very high
May Weather	13°C (56°F)	83 mm (3.3 inches)	72%	very high
June Weather	19°C (66°F)	91 mm (3.6 inches)	72%	very high
July Weather	22°C (71°F)	125 mm (4.9 inches)	67%	very high
August Weather	21°C (69°F)	89 mm (3.5 inches)	66%	very high
September Weather	17°C (62°F)	65 mm (2.6 inches)	71%	high
October Weather	10°C (50°F)	129 mm (5.1 inches)	78%	moderate
November Weather	2°C (36°F)	106 mm (4.2 inches)	84%	moderate
December Weather	-3°C (26°F)	109 mm (4.3 inches)	81%	low