January Weather in Fairfield, United States

Last updated: June 24, 2025

In Fairfield, United States, the average temperature in January hovers around -5°C (24°F), making it quite chilly. Expect minimums dropping to -23°C (-9°F) and rising to a maximum of 9°C (48°F). During this month, precipitation averages 62 mm (2.5 in) over about 9 days, contributing to an overall humidity level of 91%. Prepare to bundle up and stay warm!

January Temperature in Fairfield

In January in Fairfield, the average temperature is -5°C (24°F). Maximum temperatures can reach 9°C (48°F), while minimums can drop as low as -23°C (-9°F). Therefore, travelers should be prepared for chilly conditions and pack accordingly to ensure a comfortable 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 -5°C (24°F), with highs reaching up to 9°C (48°F) and lows dropping to around -23°C (-9°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 62 mm (2.5 in) over a span of 9 days, indicating a relatively wet period.

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 62 mm (2.5 inches) of precipitation spread over approximately 9 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 Fairfield

In Fairfield in January humidity is 91%. With an average temperature of -5°C (24°F), this humidity makes the cold feel even more biting and penetrative, creating a chilling atmosphere that's quite uncomfortable for traveling.

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 91%, 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	-5°C (24°F)	62 mm (2.5 inches)	91%	moderate
February Weather	-3°C (27°F)	75 mm (3.0 inches)	92%	moderate
March Weather	2°C (36°F)	54 mm (2.1 inches)	85%	high
April Weather	6°C (43°F)	35 mm (1.4 inches)	76%	very high
May Weather	11°C (53°F)	48 mm (1.9 inches)	66%	very high
June Weather	18°C (64°F)	17 mm (0.7 inches)	62%	extreme
July Weather	23°C (74°F)	4 mm (0.1 inches)	53%	extreme
August Weather	22°C (71°F)	15 mm (0.6 inches)	42%	very high
September Weather	16°C (61°F)	18 mm (0.7 inches)	46%	very high
October Weather	7°C (45°F)	34 mm (1.3 inches)	64%	high
November Weather	1°C (35°F)	48 mm (1.9 inches)	83%	moderate
December Weather	-4°C (24°F)	48 mm (1.9 inches)	87%	moderate