January Weather in Fairfield, United States

Last updated: June 24, 2025

In January, the average temperature in Fairfield, United States hovers around 1°C (34°F). During this time, temperatures can dip as low as -17°C (2°F) or rise to a pleasant 20°C (68°F). Expect approximately 62 mm (2.4 in) of precipitation spread over 8 days, contributing to an average humidity level of 84%. Stay prepared for a quintessential winter experience!

January Temperature in Fairfield

In January in Fairfield, the average temperature is 1°C (34°F). The maximum can reach 20°C (68°F) and the minimum can be as low as -17°C (2°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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 1°C (34°F), with highs reaching up to 20°C (68°F) and lows dropping to around -17°C (2°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 (2.4 in) over the course of 8 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 62 mm (2.4 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 Fairfield

In Fairfield in January humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp 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 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 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	1°C (34°F)	62 mm (2.4 inches)	84%	moderate
February Weather	3°C (38°F)	97 mm (3.8 inches)	83%	moderate
March Weather	6°C (44°F)	94 mm (3.7 inches)	83%	high
April Weather	12°C (54°F)	98 mm (3.9 inches)	81%	very high
May Weather	18°C (64°F)	132 mm (5.2 inches)	78%	very high
June Weather	22°C (73°F)	103 mm (4.1 inches)	79%	very high
July Weather	25°C (78°F)	134 mm (5.3 inches)	74%	very high
August Weather	24°C (76°F)	118 mm (4.7 inches)	72%	very high
September Weather	21°C (70°F)	118 mm (4.6 inches)	75%	very high
October Weather	15°C (60°F)	100 mm (3.9 inches)	81%	high
November Weather	7°C (45°F)	86 mm (3.4 inches)	85%	moderate
December Weather	3°C (38°F)	92 mm (3.6 inches)	84%	moderate