January Weather in Sully, United States

Last updated: June 24, 2025

In Sully, United States, the average temperature in January hovers around -5°C (23°F). During this chilly month, temperatures can plummet as low as -30°C (-22°F) or rise to a maximum of 14°C (57°F). Expect 44 mm (1.7 in) of precipitation spread over 7 days, with an average humidity level of 78%. Embrace the frosty climate and prepare for a unique experience!

January Temperature in Sully

In January in Sully, the average temperature is -5°C (23°F). The maximum can reach 14°C (57°F), while the minimum can drop as low as -30°C (-22°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for their visit.

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

The chart illustrates January temperature patterns in Sully, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sully, January typically has an average temperature of -5°C (23°F), with highs reaching up to 14°C (57°F) and lows dropping to around -30°C (-22°F).

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

January Precipitation in Sully

In Sully in January, the precipitation amount is 44 mm (1.7 in) spread over a duration of 7 days.

January Precipitation Trends in Sully

The chart displays monthly precipitation patterns in Sully, 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 Sully, January typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 7 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 Sully

In Sully in January, humidity is 78%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that penetrates your clothes, making outdoor activities uncomfortable and necessitating extra layers to stay warm while exploring the area.

January Average Humidity in Sully

This chart illustrates the average monthly humidity levels in Sully, 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 Sully is approximately 78%, 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 Sully

In Sully 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 Sully, you can check the information here.

Maximum UV Index Levels in Sully for January

The chart shows the monthly maximum UV Index (UVI) for Sully 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 Sully typically reaches 3, which falls under the moderate exposure category.

Data source: Sully 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 Sully Compares to Other Months

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

This table compares monthly weather conditions in Sully, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	44 mm (1.7 inches)	78%	moderate
February Weather	-4°C (24°F)	49 mm (1.9 inches)	80%	moderate
March Weather	4°C (40°F)	83 mm (3.3 inches)	77%	high
April Weather	10°C (50°F)	74 mm (2.9 inches)	77%	very high
May Weather	17°C (63°F)	163 mm (6.4 inches)	77%	very high
June Weather	23°C (74°F)	124 mm (4.9 inches)	81%	extreme
July Weather	25°C (77°F)	72 mm (2.8 inches)	81%	very high
August Weather	23°C (74°F)	65 mm (2.5 inches)	77%	very high
September Weather	20°C (69°F)	121 mm (4.8 inches)	73%	very high
October Weather	12°C (53°F)	137 mm (5.4 inches)	75%	high
November Weather	4°C (39°F)	49 mm (1.9 inches)	85%	moderate
December Weather	0°C (31°F)	40 mm (1.6 inches)	83%	moderate