December Weather in Barstow, United States

Last updated: June 24, 2025

In December, the average temperature in Barstow, United States hovers around 8°C (47°F). Expect a minimum chill of -3°C (27°F) and a warm maximum of 23°C (74°F). With an average humidity level of 75%, you might feel the dampness in the air. Prepare for some light rain, as precipitation amounts to 19 mm (0.7 in) spread over 2 days.

December Temperature in Barstow

In December in Barstow, the average temperature is 8°C (47°F), with maximums reaching up to 23°C (74°F) and minimums dropping as low as -3°C (27°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

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

The chart illustrates December temperature patterns in Barstow, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Barstow, December typically has an average temperature of 8°C (47°F), with highs reaching up to 23°C (74°F) and lows dropping to around -3°C (27°F).

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

December Precipitation in Barstow

In Barstow in December, the precipitation amount is 19 mm (0.7 in) over a span of 2 days.

December Precipitation Trends in Barstow

The chart displays monthly precipitation patterns in Barstow, 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 Barstow, December typically receives around 19 mm (0.7 inches) of precipitation spread over approximately 2 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Barstow

In Barstow in December humidity is 75%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities quite uncomfortable and requiring you to bundle up to stay warm while navigating the misty streets.

December Average Humidity in Barstow

This chart illustrates the average monthly humidity levels in Barstow, 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 Barstow is approximately 75%, 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 Barstow

In Barstow in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Barstow for better planning.

Maximum UV Index Levels in Barstow for December

The chart shows the monthly maximum UV Index (UVI) for Barstow 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 Barstow typically reaches 4, which falls under the moderate exposure category.

Data source: Barstow 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 Barstow Compares to Other Months

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

This table compares monthly weather conditions in Barstow, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	22 mm (0.9 inches)	76%	moderate
February Weather	11°C (51°F)	13 mm (0.5 inches)	80%	high
March Weather	14°C (57°F)	17 mm (0.7 inches)	69%	very high
April Weather	18°C (65°F)	11 mm (0.4 inches)	57%	very high
May Weather	22°C (71°F)	3 mm (0.1 inches)	45%	extreme
June Weather	28°C (83°F)	1 mm (0.0 inches)	34%	extreme
July Weather	31°C (89°F)	3 mm (0.1 inches)	29%	extreme
August Weather	31°C (88°F)	1 mm (0.0 inches)	28%	extreme
September Weather	27°C (80°F)	1 mm (0.0 inches)	41%	very high
October Weather	19°C (67°F)	2 mm (0.1 inches)	54%	very high
November Weather	14°C (57°F)	6 mm (0.2 inches)	68%	moderate
December Weather	8°C (47°F)	19 mm (0.7 inches)	75%	moderate