January Weather in Joint Base Lewis McChord, United States

Last updated: June 24, 2025

In January, the average temperature in Joint Base Lewis McChord, United States hovers around 5°C (41°F). Expect chilly days, with minimum temperatures dropping to -11°C (12°F) and reaching a maximum of 14°C (58°F). With 183 mm (7.2 in) of precipitation spread over 16 days, you might want to keep an umbrella handy. The average humidity also remains high at 86%, adding to the crisp atmosphere of the season.

January Temperature in Joint Base Lewis McChord

In January in Joint Base Lewis McChord, the average temperature is 5°C (41°F), with maximums reaching up to 14°C (58°F) and minimums dropping as low as -11°C (12°F). It's advisable to pack warm clothing and be prepared for chilly temperatures during your travels.

January Weather in Joint Base Lewis McChord: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Joint Base Lewis McChord, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joint Base Lewis McChord, January typically has an average temperature of 5°C (41°F), with highs reaching up to 14°C (58°F) and lows dropping to around -11°C (12°F).

Data source: Temperature data for Joint Base Lewis McChord generated using information from the Copernicus Climate Change Service.

January Precipitation in Joint Base Lewis McChord

In Joint Base Lewis McChord in January, the precipitation amount is 183 mm (7.2 in) over a period of 16 days.

January Precipitation Trends in Joint Base Lewis McChord

The chart displays monthly precipitation patterns in Joint Base Lewis McChord, 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 Joint Base Lewis McChord, January typically receives around 183 mm (7.2 inches) of precipitation spread over approximately 16 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 Joint Base Lewis McChord

In Joint Base Lewis McChord in January humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

January Average Humidity in Joint Base Lewis McChord

This chart illustrates the average monthly humidity levels in Joint Base Lewis McChord, 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 Joint Base Lewis McChord is approximately 86%, 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 Joint Base Lewis McChord

In Joint Base Lewis McChord 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 Joint Base Lewis McChord, you can visit Hourly UV Index in Joint Base Lewis McChord.

Maximum UV Index Levels in Joint Base Lewis McChord for January

The chart shows the monthly maximum UV Index (UVI) for Joint Base Lewis McChord 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 Joint Base Lewis McChord typically reaches 2, which falls under the low exposure category.

Data source: Joint Base Lewis McChord 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 Joint Base Lewis McChord Compares to Other Months

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

This table compares monthly weather conditions in Joint Base Lewis McChord, 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 (41°F)	183 mm (7.2 inches)	86%	low
February Weather	4°C (40°F)	189 mm (7.4 inches)	84%	moderate
March Weather	7°C (44°F)	136 mm (5.4 inches)	85%	moderate
April Weather	9°C (49°F)	118 mm (4.7 inches)	83%	high
May Weather	13°C (55°F)	68 mm (2.7 inches)	84%	very high
June Weather	16°C (60°F)	58 mm (2.3 inches)	84%	very high
July Weather	18°C (65°F)	11 mm (0.4 inches)	82%	very high
August Weather	18°C (66°F)	13 mm (0.5 inches)	73%	very high
September Weather	16°C (60°F)	90 mm (3.5 inches)	74%	high
October Weather	10°C (51°F)	142 mm (5.6 inches)	83%	moderate
November Weather	7°C (45°F)	180 mm (7.1 inches)	86%	moderate
December Weather	5°C (41°F)	201 mm (7.9 inches)	87%	low