January Weather in Watertown, United States

Last updated: June 24, 2025

In January, the average temperature in Watertown, United States hovers around -5°C (23°F), with minimums plunging to -26°C (-15°F) and maximums reaching up to 12°C (55°F). Expect precipitation of about 93 mm (3.7 in) spread over 13 days. The air is quite damp, with an average humidity of 90%, making it a chilly, but enchanting time to explore this locale.

January Temperature in Watertown

In January in Watertown, the average temperature is -5°C (23°F). Maximums can reach 12°C (55°F), while minimums can drop as low as -26°C (-15°F). Be sure to pack warm clothing and prepare for a range of temperatures if you plan to travel during this month.

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 -5°C (23°F), with highs reaching up to 12°C (55°F) and lows dropping to around -26°C (-15°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 93 mm (3.7 in), which falls over the course of 13 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 93 mm (3.7 inches) of precipitation spread over approximately 13 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 90%. With an average temperature of -5°C (23°F), this humidity feels like walking through an icy mist, making it challenging to stay warm while traveling as your clothes cling to your skin, and every breath feels damp and heavy in the frigid air.

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 90%, 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 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 Watertown, you can visit Hourly UV Index in Watertown.

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 2, which falls under the low 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	-5°C (23°F)	93 mm (3.7 inches)	90%	low
February Weather	-4°C (25°F)	88 mm (3.5 inches)	90%	moderate
March Weather	0°C (32°F)	86 mm (3.4 inches)	87%	high
April Weather	6°C (43°F)	123 mm (4.9 inches)	88%	very high
May Weather	13°C (56°F)	103 mm (4.1 inches)	82%	very high
June Weather	18°C (65°F)	97 mm (3.8 inches)	79%	very high
July Weather	22°C (72°F)	145 mm (5.7 inches)	78%	very high
August Weather	21°C (70°F)	107 mm (4.2 inches)	76%	very high
September Weather	17°C (63°F)	78 mm (3.1 inches)	78%	high
October Weather	11°C (53°F)	160 mm (6.3 inches)	84%	moderate
November Weather	4°C (39°F)	127 mm (5.0 inches)	89%	moderate
December Weather	-1°C (30°F)	108 mm (4.2 inches)	86%	low