January Weather in Fairfield, United States

Last updated: June 24, 2025

In January, the average temperature in Fairfield, United States hovers around -4°C (25°F), with temperature fluctuations ranging from a chilling -30°C (-21°F) to a mild 14°C (57°F). Expect 52 mm (2.0 in) of precipitation over 6 days, and prepare for an atmosphere of 81% humidity that will keep the air crisp and cool.

January Temperature in Fairfield

In January in Fairfield, the average temperature is -4°C (25°F), with maximums reaching 14°C (57°F) and minimums plummeting to -30°C (-21°F). Travelers should prepare for a wide temperature range and dress accordingly to fully enjoy their visit.

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

The chart illustrates January temperature patterns in Fairfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfield, January typically has an average temperature of -4°C (25°F), with highs reaching up to 14°C (57°F) and lows dropping to around -30°C (-21°F).

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

January Precipitation in Fairfield

In Fairfield, in January, the precipitation amount is 52 mm (2.0 in) over the course of 6 days.

January Precipitation Trends in Fairfield

The chart displays monthly precipitation patterns in Fairfield, 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 Fairfield, January typically receives around 52 mm (2.0 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Fairfield

In Fairfield in January humidity is 81%. With an average temperature of -4°C (25°F), this humidity feels like an icy blanket wrapping around you, making travel quite uncomfortable as each breath draws in a damp chill, often leaving you shivering and increasingly wary of the frosty air.

January Average Humidity in Fairfield

This chart illustrates the average monthly humidity levels in Fairfield, 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 Fairfield is approximately 81%, 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 Fairfield

In Fairfield 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 Fairfield, you can check the information here.

Maximum UV Index Levels in Fairfield for January

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

Data source: Fairfield 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 Fairfield Compares to Other Months

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

This table compares monthly weather conditions in Fairfield, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	52 mm (2.0 inches)	81%	moderate
February Weather	-3°C (27°F)	55 mm (2.2 inches)	81%	moderate
March Weather	5°C (42°F)	91 mm (3.6 inches)	81%	high
April Weather	10°C (51°F)	83 mm (3.3 inches)	82%	very high
May Weather	18°C (64°F)	160 mm (6.3 inches)	78%	very high
June Weather	24°C (75°F)	133 mm (5.2 inches)	81%	extreme
July Weather	25°C (78°F)	70 mm (2.8 inches)	79%	very high
August Weather	24°C (75°F)	73 mm (2.9 inches)	77%	very high
September Weather	21°C (69°F)	121 mm (4.8 inches)	78%	very high
October Weather	12°C (54°F)	124 mm (4.9 inches)	78%	high
November Weather	4°C (40°F)	52 mm (2.0 inches)	87%	moderate
December Weather	0°C (33°F)	43 mm (1.7 inches)	84%	moderate