January Weather in Grafton, United States

Last updated: June 24, 2025

In January, the average temperature in Grafton, United States hovers around -4°C (24°F). Expect a chill in the air, with minimum temperatures dipping as low as -29°C (-20°F) and highs reaching up to 11°C (52°F). On average, there's 59 mm (2.3 in) of precipitation over 8 days, contributing to a notable 85% humidity level. Prepare for a brisk month filled with frosty days!

January Temperature in Grafton

In January in Grafton, the average temperature is -4°C (24°F). The maximum can reach 11°C (52°F), while the minimum can drop as low as -29°C (-20°F). Travelers should prepare for a wide range of temperatures and dress warmly for excursions during this chilly month.

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 -4°C (24°F), with highs reaching up to 11°C (52°F) and lows dropping to around -29°C (-20°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 59 mm (2.3 in) spread over 8 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 59 mm (2.3 inches) of precipitation spread over approximately 8 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 85%. With an average temperature of -4°C (24°F), this humidity feels like a biting chill that penetrates your layers, making outdoor exploration uncomfortable and urging you to seek warm shelter frequently.

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 85%, 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 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Grafton, you can visit Hourly UV Index in Grafton.

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 2, which falls under the low 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	-4°C (24°F)	59 mm (2.3 inches)	85%	low
February Weather	-4°C (25°F)	57 mm (2.2 inches)	85%	moderate
March Weather	2°C (35°F)	68 mm (2.7 inches)	85%	moderate
April Weather	6°C (43°F)	108 mm (4.3 inches)	85%	very high
May Weather	12°C (54°F)	131 mm (5.2 inches)	78%	very high
June Weather	18°C (65°F)	101 mm (4.0 inches)	80%	very high
July Weather	22°C (72°F)	88 mm (3.5 inches)	78%	very high
August Weather	22°C (71°F)	77 mm (3.0 inches)	76%	very high
September Weather	18°C (65°F)	100 mm (3.9 inches)	79%	high
October Weather	11°C (53°F)	119 mm (4.7 inches)	83%	moderate
November Weather	3°C (38°F)	52 mm (2.1 inches)	88%	moderate
December Weather	0°C (32°F)	52 mm (2.1 inches)	81%	low