January Weather in Fairfield, United States

Last updated: June 24, 2025

In January, the average temperature in Fairfield, United States is 0°C (32°F), with a minimum dipping to -21°C (-5°F) and a maximum reaching 12°C (53°F). Expect 76 mm (3.0 in) of precipitation spread over 13 days, and be prepared for a high average humidity of 89%.

January Temperature in Fairfield

In January in Fairfield, the average temperature is 0°C (32°F). Maximum temperatures can reach 12°C (53°F), while minimums can dip as low as -21°C (-5°F). It's advisable to pack warm clothing and prepare for a range of weather conditions when visiting during this time.

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 0°C (32°F), with highs reaching up to 12°C (53°F) and lows dropping to around -21°C (-5°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 total precipitation amount is 76 mm (3.0 in), which occurs over the course of 13 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 76 mm (3.0 inches) of precipitation spread over approximately 13 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 89%. With an average temperature of 0°C (32°F), this humidity feels like a chilly embrace that makes every breath feel heavy and damp, turning your travel experience into a constant dance with the cold and moisture in the air, leaving you longing for warmth and comfort at every turn.

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 89%, 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	0°C (32°F)	76 mm (3.0 inches)	89%	low
February Weather	-1°C (31°F)	75 mm (3.0 inches)	89%	moderate
March Weather	4°C (40°F)	63 mm (2.5 inches)	87%	moderate
April Weather	8°C (47°F)	57 mm (2.2 inches)	84%	high
May Weather	14°C (57°F)	53 mm (2.1 inches)	77%	very high
June Weather	19°C (66°F)	24 mm (1.0 inches)	78%	very high
July Weather	23°C (74°F)	3 mm (0.1 inches)	77%	very high
August Weather	23°C (73°F)	9 mm (0.3 inches)	64%	very high
September Weather	17°C (62°F)	32 mm (1.2 inches)	62%	high
October Weather	9°C (48°F)	61 mm (2.4 inches)	79%	moderate
November Weather	4°C (39°F)	89 mm (3.5 inches)	87%	moderate
December Weather	0°C (33°F)	78 mm (3.1 inches)	90%	low