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December Weather in Mammoth, United States

Last updated: June 24, 2025

In December, the average temperature in Mammoth, United States hovers around 10°C (51°F). Prepare for a range, as temperatures can dip to a minimum of -3°C (27°F) and soar to a maximum of 25°C (78°F). You'll likely experience about 37 mm (1.5 in) of precipitation spread over 5 days, contributing to a high average humidity level of 82%.

December Temperature in Mammoth

In December in Mammoth, the average temperature is 10°C (51°F). The maximum can reach 25°C (78°F), while the minimum can drop as low as -3°C (27°F). Be prepared for a range of temperatures and pack accordingly for your travels!

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

The chart illustrates December temperature patterns in Mammoth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mammoth, December typically has an average temperature of 10°C (51°F), with highs reaching up to 25°C (78°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec495158687585858480696050
Data source: Temperature data for Mammoth 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 Mammoth

In Mammoth in December, the precipitation amount is 37 mm (1.5 in) spread over a period of 5 days.

December Precipitation Trends in Mammoth

The chart displays monthly precipitation patterns in Mammoth, 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 Mammoth, December typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec4450305711845539282437
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mammoth

In Mammoth in December humidity is 82%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that clings to your skin, making outdoor adventures less appealing and prompting travelers to seek cozy indoor activities or warm drinks to counter the brisk air.

December Average Humidity in Mammoth

This chart illustrates the average monthly humidity levels in Mammoth, 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 Mammoth is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mammoth

In Mammoth 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 Mammoth for better planning.

Maximum UV Index Levels in Mammoth for December

The chart shows the monthly maximum UV Index (UVI) for Mammoth 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 Mammoth typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121111864
Data source: Mammoth 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 Mammoth Compares to Other Months

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

This table compares monthly weather conditions in Mammoth, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (49°F)44 mm (1.7 inches)76%moderate
February Weather11°C (51°F)50 mm (2.0 inches)79%high
March Weather15°C (58°F)30 mm (1.2 inches)67%very high
April Weather20°C (68°F)5 mm (0.2 inches)55%extreme
May Weather24°C (75°F)7 mm (0.3 inches)40%extreme
June Weather30°C (85°F)11 mm (0.4 inches)33%extreme
July Weather30°C (85°F)84 mm (3.3 inches)34%extreme
August Weather29°C (84°F)55 mm (2.2 inches)48%extreme
September Weather26°C (80°F)39 mm (1.5 inches)64%extreme
October Weather21°C (69°F)28 mm (1.1 inches)67%very high
November Weather15°C (60°F)23 mm (0.9 inches)77%high
December Weather10°C (51°F)37 mm (1.5 inches)82%moderate

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