January Weather in Grafton, United States

Last updated: June 24, 2025

In January, the average temperature in Grafton, United States hovers around 0°C (33°F), with a possible minimum of -23°C (-9°F) and a maximum reaching 21°C (70°F). Visitors can expect 102 mm (4.0 in) of precipitation over approximately 15 days, accompanied by a high average humidity of 88%. Be prepared for chilly days and occasional rain!

January Temperature in Grafton

In January in Grafton, the average temperature is 0°C (33°F). Maximum can reach 21°C (70°F) and minimum can be as low as -23°C (-9°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 0°C (33°F), with highs reaching up to 21°C (70°F) and lows dropping to around -23°C (-9°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 102 mm (4.0 in) over the course of 15 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 102 mm (4.0 inches) of precipitation spread over approximately 15 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 88%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm and dry.

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 88%, 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	0°C (33°F)	102 mm (4.0 inches)	88%	moderate
February Weather	3°C (38°F)	159 mm (6.2 inches)	88%	moderate
March Weather	6°C (44°F)	122 mm (4.8 inches)	88%	high
April Weather	11°C (53°F)	152 mm (6.0 inches)	86%	very high
May Weather	17°C (63°F)	160 mm (6.3 inches)	82%	very high
June Weather	20°C (69°F)	145 mm (5.7 inches)	84%	very high
July Weather	23°C (74°F)	115 mm (4.5 inches)	82%	very high
August Weather	22°C (72°F)	114 mm (4.5 inches)	73%	very high
September Weather	19°C (67°F)	113 mm (4.5 inches)	73%	very high
October Weather	14°C (58°F)	120 mm (4.7 inches)	81%	high
November Weather	6°C (43°F)	89 mm (3.5 inches)	89%	moderate
December Weather	3°C (38°F)	134 mm (5.3 inches)	86%	moderate