December Weather in Kelso, United States

Last updated: June 24, 2025

In Kelso, United States, the average temperature in December hovers around 6°C (42°F). However, expect a range of conditions, with minimums dipping to -13°C (9°F) and maximums reaching up to 23°C (74°F). Precipitation is notable, with about 91 mm (3.6 in) expected over 8 days, contributing to an average humidity level of 88%. Be prepared for a mix of weather!

December Temperature in Kelso

In December in Kelso, the average temperature is 6°C (42°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop as low as -13°C (9°F). Be prepared for a wide range of temperatures when traveling to Kelso this month.

December Weather in Kelso: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Kelso, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kelso, December typically has an average temperature of 6°C (42°F), with highs reaching up to 23°C (74°F) and lows dropping to around -13°C (9°F).

Data source: Temperature data for Kelso generated using information from the Copernicus Climate Change Service.

December Precipitation in Kelso

In Kelso in December, the total precipitation amount is 91 mm (3.6 in) over the course of 8 days.

December Precipitation Trends in Kelso

The chart displays monthly precipitation patterns in Kelso, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Kelso, December typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Kelso

In Kelso in December, humidity is 88%. With an average temperature of 6°C (42°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as the cold air clings to your skin and saps your energy.

December Average Humidity in Kelso

This chart illustrates the average monthly humidity levels in Kelso, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Kelso is approximately 88%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Kelso

In Kelso in December, 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 Kelso, you can check the information here.

Maximum UV Index Levels in Kelso for December

The chart shows the monthly maximum UV Index (UVI) for Kelso in December, 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 December, the maximum UV index in Kelso typically reaches 3, which falls under the moderate exposure category.

Data source: Kelso December 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 December Weather in Kelso Compares to Other Months

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

This table compares monthly weather conditions in Kelso, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	107 mm (4.2 inches)	86%	moderate
February Weather	4°C (40°F)	127 mm (5.0 inches)	84%	high
March Weather	10°C (50°F)	164 mm (6.5 inches)	84%	high
April Weather	14°C (57°F)	135 mm (5.3 inches)	80%	very high
May Weather	20°C (69°F)	158 mm (6.2 inches)	82%	extreme
June Weather	25°C (77°F)	102 mm (4.0 inches)	83%	extreme
July Weather	27°C (81°F)	96 mm (3.8 inches)	79%	very high
August Weather	25°C (78°F)	93 mm (3.6 inches)	76%	very high
September Weather	23°C (74°F)	72 mm (2.9 inches)	75%	very high
October Weather	16°C (61°F)	129 mm (5.1 inches)	74%	high
November Weather	8°C (46°F)	95 mm (3.7 inches)	85%	moderate
December Weather	6°C (42°F)	91 mm (3.6 inches)	88%	moderate