January Weather in Watertown, United States

Last updated: June 24, 2025

In Watertown, United States, the average temperature in January hovers around -10°C (15°F). Expect extremes, with minimums plummeting to -36°C (-32°F) and maximums reaching up to 7°C (44°F). The month brings about 22 mm (0.9 in) of precipitation over 5 days, coupled with a high average humidity of 85%.

January Temperature in Watertown

In January in Watertown, the average temperature is -10°C (15°F), with maximums reaching 7°C (44°F) and minimums plummeting as low as -36°C (-32°F). Travelers should prepare for extremely cold conditions and pack accordingly for their visit.

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

The chart illustrates January temperature patterns in Watertown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Watertown, January typically has an average temperature of -10°C (15°F), with highs reaching up to 7°C (44°F) and lows dropping to around -36°C (-32°F).

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

January Precipitation in Watertown

In Watertown in January, the total precipitation amount is 22 mm (0.9 in) spread over a period of 5 days.

January Precipitation Trends in Watertown

The chart displays monthly precipitation patterns in Watertown, 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 Watertown, January typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 5 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 Watertown

In Watertown in January humidity is 85%. With an average temperature of -10°C (15°F), this humidity feels like an uncomfortable chill that cuts through layers of clothing, making it challenging to enjoy outdoor activities or explore the area comfortably.

January Average Humidity in Watertown

This chart illustrates the average monthly humidity levels in Watertown, 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 Watertown 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 Watertown

In Watertown 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 Watertown, you can check the information here.

Maximum UV Index Levels in Watertown for January

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

Data source: Watertown 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 Watertown Compares to Other Months

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

This table compares monthly weather conditions in Watertown, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	22 mm (0.9 inches)	85%	moderate
February Weather	-10°C (14°F)	17 mm (0.7 inches)	89%	moderate
March Weather	-1°C (31°F)	48 mm (1.9 inches)	81%	high
April Weather	5°C (41°F)	65 mm (2.6 inches)	82%	high
May Weather	13°C (56°F)	90 mm (3.6 inches)	76%	very high
June Weather	21°C (70°F)	84 mm (3.3 inches)	81%	very high
July Weather	23°C (73°F)	81 mm (3.2 inches)	82%	very high
August Weather	21°C (70°F)	113 mm (4.4 inches)	83%	very high
September Weather	17°C (62°F)	84 mm (3.3 inches)	82%	very high
October Weather	7°C (46°F)	80 mm (3.1 inches)	82%	moderate
November Weather	0°C (33°F)	25 mm (1.0 inches)	87%	moderate
December Weather	-5°C (23°F)	33 mm (1.3 inches)	84%	low