December Weather in Fort Irwin, United States

Last updated: June 24, 2025

In December, the average temperature in Fort Irwin, United States hovers around 8°C (46°F). Expect a range that can dip to a chilly -3°C (27°F) at the lowest and reach a pleasant 23°C (73°F) at its peak. During this month, average precipitation is measured at 18 mm (0.7 in) over 2 days, accompanied by an average humidity of 75%. Enjoy the variety of weather this month brings!

December Temperature in Fort Irwin

In December in Fort Irwin, the average temperature is 8°C (46°F). The maximum can reach 23°C (73°F), while the minimum can drop as low as -3°C (27°F). Be prepared for varied weather conditions, making it essential to pack layers for your trip.

December Weather in Fort Irwin: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fort Irwin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Irwin, December typically has an average temperature of 8°C (46°F), with highs reaching up to 23°C (73°F) and lows dropping to around -3°C (27°F).

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

December Precipitation in Fort Irwin

In Fort Irwin in December, the precipitation amount is 18 mm (0.7 in) over the course of 2 days.

December Precipitation Trends in Fort Irwin

The chart displays monthly precipitation patterns in Fort Irwin, 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 Fort Irwin, December typically receives around 18 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.

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Millimeters (mm) Inches (in)

December Humidity in Fort Irwin

In Fort Irwin in December, humidity is 75%. With an average temperature of 8°C (46°F), this humidity feels like a brisk chill that invigorates your senses, making outdoor adventures both refreshing and slightly uncomfortable.

December Average Humidity in Fort Irwin

This chart illustrates the average monthly humidity levels in Fort Irwin, 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 Fort Irwin 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 Fort Irwin

In Fort Irwin 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 Fort Irwin for better planning.

Maximum UV Index Levels in Fort Irwin for December

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

Data source: Fort Irwin 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 Fort Irwin Compares to Other Months

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

This table compares monthly weather conditions in Fort Irwin, 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 (48°F)	22 mm (0.9 inches)	76%	moderate
February Weather	10°C (51°F)	15 mm (0.6 inches)	80%	high
March Weather	13°C (57°F)	17 mm (0.7 inches)	69%	very high
April Weather	18°C (65°F)	12 mm (0.5 inches)	57%	very high
May Weather	22°C (72°F)	4 mm (0.2 inches)	45%	extreme
June Weather	28°C (83°F)	1 mm (0.0 inches)	34%	extreme
July Weather	32°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)	3 mm (0.1 inches)	54%	high
November Weather	13°C (56°F)	6 mm (0.2 inches)	68%	moderate
December Weather	8°C (46°F)	18 mm (0.7 inches)	75%	moderate