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December Weather in Mission, United States

Last updated: June 24, 2025

In December, the average temperature in Mission, United States hovers around 3°C (38°F), with minimums dipping as low as -18°C (0°F) and maximums reaching a pleasant 23°C (73°F). Expect precipitation of about 34 mm (1.3 in) over roughly 4 days. With humidity levels around 86%, prepare for a brisk and somewhat damp experience!

December Temperature in Mission

In December in Mission, the average temperature is 3°C (38°F), with maximums reaching up to 23°C (73°F) and minimums dropping as low as -18°C (0°F). This diverse temperature range makes Mission an intriguing destination for travelers seeking a unique climate experience.

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 3°C (38°F), with highs reaching up to 23°C (73°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec313346546677807772574438
Data source: Temperature data for Mission generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Mission

In Mission in December, the precipitation amount is 34 mm (1.3 in) over a span of 4 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 34 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec5436999120894113127861104534
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mission

In Mission in December humidity is 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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 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 Mission, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)54 mm (2.1 inches)80%moderate
February Weather0°C (33°F)36 mm (1.4 inches)78%moderate
March Weather8°C (47°F)99 mm (3.9 inches)75%high
April Weather12°C (54°F)91 mm (3.6 inches)77%very high
May Weather19°C (66°F)208 mm (8.2 inches)82%very high
June Weather25°C (77°F)94 mm (3.7 inches)83%extreme
July Weather27°C (80°F)113 mm (4.4 inches)81%extreme
August Weather25°C (77°F)126 mm (5.0 inches)78%very high
September Weather22°C (72°F)86 mm (3.4 inches)72%very high
October Weather14°C (57°F)110 mm (4.3 inches)72%high
November Weather7°C (44°F)45 mm (1.8 inches)84%moderate
December Weather3°C (38°F)34 mm (1.3 inches)86%moderate

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