January Weather in Southbury, United States

Last updated: June 24, 2025

In Southbury, United States, the average temperature in January hovers around -1°C (31°F). Though it can plummet to a chilling -20°C (-3°F), warmer days might reach a comfortable 18°C (66°F). Expect about 71 mm (2.8 in) of precipitation spread over 8 days, with an average humidity of a high 84%. Prepare for a month of contrast and moisture!

January Temperature in Southbury

In January in Southbury, the average temperature is -1°C (31°F), with maximums reaching 18°C (66°F) and minimums plunging as low as -20°C (-3°F). Travelers should be prepared for a wide range of temperatures, from chilly to relatively mild, making layering essential for outdoor activities.

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

The chart illustrates January temperature patterns in Southbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Southbury, January typically has an average temperature of -1°C (31°F), with highs reaching up to 18°C (66°F) and lows dropping to around -20°C (-3°F).

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

January Precipitation in Southbury

In Southbury in January, the precipitation amount is 71 mm (2.8 in) over the course of 8 days.

January Precipitation Trends in Southbury

The chart displays monthly precipitation patterns in Southbury, 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 Southbury, January typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 8 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 Southbury

In Southbury in January humidity is 84%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through layers of clothing, making outdoor excursions brisk and invigorating, yet challenging for those unaccustomed to such damp conditions.

January Average Humidity in Southbury

This chart illustrates the average monthly humidity levels in Southbury, 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 Southbury is approximately 84%, 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 Southbury

In Southbury 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 Southbury, you can check the information here.

Maximum UV Index Levels in Southbury for January

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

Data source: Southbury 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 Southbury Compares to Other Months

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

This table compares monthly weather conditions in Southbury, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	71 mm (2.8 inches)	84%	moderate
February Weather	1°C (33°F)	96 mm (3.8 inches)	82%	moderate
March Weather	4°C (39°F)	91 mm (3.6 inches)	81%	high
April Weather	9°C (49°F)	129 mm (5.1 inches)	78%	very high
May Weather	15°C (59°F)	112 mm (4.4 inches)	69%	very high
June Weather	20°C (69°F)	102 mm (4.0 inches)	69%	very high
July Weather	24°C (75°F)	143 mm (5.6 inches)	62%	very high
August Weather	23°C (73°F)	106 mm (4.2 inches)	65%	very high
September Weather	19°C (67°F)	114 mm (4.5 inches)	68%	very high
October Weather	14°C (57°F)	143 mm (5.6 inches)	74%	high
November Weather	6°C (43°F)	94 mm (3.7 inches)	82%	moderate
December Weather	1°C (35°F)	121 mm (4.8 inches)	80%	low