January Weather in Grafton, United States

Last updated: June 24, 2025

In January, the average temperature in Grafton, United States hovers around -13°C (9°F). However, be prepared for an extreme range, with minimums plunging to -38°C (-36°F) and occasional maximums reaching 4°C (40°F). This chilly month typically sees 17 mm (0.6 in) of precipitation spread over 4 days, and the air remains notably damp with an average humidity of 92%.

January Temperature in Grafton

In January in Grafton, the average temperature is -13°C (9°F), with maximums reaching up to 4°C (40°F) and minimums plummeting as low as -38°C (-36°F). Be sure to bundle up and prepare for extremely cold conditions if you're planning to travel 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 -13°C (9°F), with highs reaching up to 4°C (40°F) and lows dropping to around -38°C (-36°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 precipitation amount is 17 mm (0.6 in) spread over a duration of 4 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 17 mm (0.6 inches) of precipitation spread over approximately 4 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 92%. With an average temperature of -13°C (9°F), this humidity feels like a biting cold that penetrates through layers of clothing, making travel feel like a struggle against the elements.

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 92%, 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	-13°C (9°F)	17 mm (0.6 inches)	92%	low
February Weather	-14°C (7°F)	18 mm (0.7 inches)	90%	moderate
March Weather	-4°C (25°F)	22 mm (0.9 inches)	88%	moderate
April Weather	3°C (38°F)	27 mm (1.1 inches)	81%	high
May Weather	13°C (55°F)	48 mm (1.9 inches)	74%	very high
June Weather	20°C (68°F)	64 mm (2.5 inches)	72%	very high
July Weather	22°C (72°F)	54 mm (2.1 inches)	74%	very high
August Weather	20°C (68°F)	63 mm (2.5 inches)	76%	very high
September Weather	15°C (59°F)	82 mm (3.2 inches)	73%	high
October Weather	6°C (43°F)	79 mm (3.1 inches)	76%	moderate
November Weather	-3°C (26°F)	26 mm (1.0 inches)	86%	moderate
December Weather	-9°C (16°F)	30 mm (1.2 inches)	91%	low