January Weather in Fairfield, United States

Last updated: June 24, 2025

In Fairfield, United States, the average temperature in January hovers around -4°C (25°F). However, temperatures can drop as low as -33°C (-26°F) and rise to a maximum of 11°C (52°F). Expect 13 mm (0.5 in) of precipitation spread over 3 days, with an average humidity level of 87%, making for a chilly and damp atmosphere.

January Temperature in Fairfield

In January in Fairfield, the average temperature is -4°C (25°F). Maximums can reach 11°C (52°F) and minimums can be as low as -33°C (-26°F). Be prepared for a wide range of temperatures while traveling during this month in Fairfield.

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 11°C (52°F) and lows dropping to around -33°C (-26°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 13 mm (0.5 in) over a span of 3 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 13 mm (0.5 inches) of precipitation spread over approximately 3 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 87%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step outside feel like an endeavor as the cold damp air numbs your senses and weighs you down, creating an atmosphere that is both invigorating and challenging 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 87%, 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 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 Fairfield, you can visit Hourly UV Index in Fairfield.

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 2, which falls under the low 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)	13 mm (0.5 inches)	87%	low
February Weather	-7°C (19°F)	35 mm (1.4 inches)	88%	moderate
March Weather	0°C (33°F)	25 mm (1.0 inches)	83%	moderate
April Weather	5°C (41°F)	54 mm (2.1 inches)	78%	high
May Weather	12°C (53°F)	75 mm (2.9 inches)	76%	very high
June Weather	17°C (63°F)	80 mm (3.1 inches)	78%	very high
July Weather	21°C (71°F)	9 mm (0.4 inches)	77%	very high
August Weather	20°C (68°F)	20 mm (0.8 inches)	71%	very high
September Weather	14°C (58°F)	38 mm (1.5 inches)	68%	high
October Weather	6°C (44°F)	33 mm (1.3 inches)	72%	moderate
November Weather	2°C (36°F)	24 mm (0.9 inches)	84%	moderate
December Weather	-2°C (28°F)	23 mm (0.9 inches)	90%	low