December Weather in Mission, United States

Last updated: June 24, 2025

In December, the average temperature in Mission, United States hovers around 2°C (36°F). Expect a chill, with minimum temperatures dipping to -16°C (4°F), while maximums can reach a pleasant 20°C (68°F). Prepare for some moisture, as precipitation averages 63 mm (2.5 in) over approximately 14 days. The air will feel damp, with an average humidity of 87%, making it essential to bundle up for comfort!

December Temperature in Mission

In December in Mission, the average temperature is 2°C (36°F). The maximum can reach 20°C (68°F), while the minimum can drop as low as -16°C (4°F). Travelers should be prepared for a wide range of temperatures, packing both warm layers and lighter clothing.

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

The chart illustrates December temperature patterns in Mission, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mission, December typically has an average temperature of 2°C (36°F), with highs reaching up to 20°C (68°F) and lows dropping to around -16°C (4°F).

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

December Precipitation in Mission

In Mission in December, the precipitation amount is 63 mm (2.5 in) over a span of 14 days.

December Precipitation Trends in Mission

The chart displays monthly precipitation patterns in Mission, 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 Mission, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 14 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 Mission

In Mission in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

December Average Humidity in Mission

This chart illustrates the average monthly humidity levels in Mission, 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 Mission is approximately 87%, 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 Mission

In Mission in December, 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 Mission, you can visit Hourly UV Index in Mission.

Maximum UV Index Levels in Mission for December

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

Data source: Mission 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 Mission Compares to Other Months

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

This table compares monthly weather conditions in Mission, 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 (36°F)	59 mm (2.3 inches)	86%	low
February Weather	2°C (36°F)	88 mm (3.5 inches)	86%	moderate
March Weather	6°C (44°F)	61 mm (2.4 inches)	85%	high
April Weather	10°C (51°F)	49 mm (1.9 inches)	83%	high
May Weather	15°C (60°F)	34 mm (1.3 inches)	77%	very high
June Weather	20°C (68°F)	16 mm (0.6 inches)	81%	very high
July Weather	25°C (77°F)	0 mm (0.0 inches)	76%	very high
August Weather	24°C (75°F)	8 mm (0.3 inches)	60%	very high
September Weather	18°C (65°F)	19 mm (0.7 inches)	58%	high
October Weather	11°C (52°F)	45 mm (1.8 inches)	75%	moderate
November Weather	6°C (42°F)	63 mm (2.5 inches)	85%	moderate
December Weather	2°C (36°F)	63 mm (2.5 inches)	87%	low