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December Weather in Altamont, United States

Last updated: June 24, 2025

In Altamont, United States, the average temperature in December hovers around 6°C (42°F). Temperature fluctuations can be significant, with minimums dipping to -12°C (10°F) and maximums reaching 24°C (75°F). Expect around 36 mm (1.4 in) of precipitation spread across 5 days and a high average humidity of 85%, creating a crisp yet damp atmosphere.

December Temperature in Altamont

In December in Altamont, the average temperature is 6°C (42°F). Maximums can reach 24°C (75°F) and minimums can drop to as low as -12°C (10°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.

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

The chart illustrates December temperature patterns in Altamont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altamont, December typically has an average temperature of 6°C (42°F), with highs reaching up to 24°C (75°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec363851576878817975604842
Data source: Temperature data for Altamont 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 Altamont

In Altamont in December, the precipitation amount is 36 mm (1.4 in) over the course of 5 days.

December Precipitation Trends in Altamont

The chart displays monthly precipitation patterns in Altamont, 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 Altamont, December typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec646012311424799101115861344836
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Altamont

In Altamont in December, humidity is 85%. With an average temperature of 6°C (42°F), this humidity feels like walking through a thick mist, making even short strolls feel damp and chilly, which can be uncomfortable for traveling.

December Average Humidity in Altamont

This chart illustrates the average monthly humidity levels in Altamont, 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 Altamont is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%71%74%83%83%81%73%67%72%82%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Altamont

In Altamont 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 Altamont, you can check the information here.

Maximum UV Index Levels in Altamont for December

The chart shows the monthly maximum UV Index (UVI) for Altamont 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 Altamont typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35710101111109753
Data source: Altamont 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 Altamont Compares to Other Months

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

This table compares monthly weather conditions in Altamont, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)64 mm (2.5 inches)77%moderate
February Weather3°C (38°F)60 mm (2.3 inches)76%moderate
March Weather10°C (51°F)123 mm (4.8 inches)71%high
April Weather14°C (58°F)114 mm (4.5 inches)73%very high
May Weather20°C (68°F)247 mm (9.7 inches)83%very high
June Weather26°C (78°F)99 mm (3.9 inches)83%extreme
July Weather27°C (82°F)101 mm (4.0 inches)81%extreme
August Weather26°C (79°F)115 mm (4.5 inches)73%very high
September Weather24°C (75°F)86 mm (3.4 inches)67%very high
October Weather16°C (60°F)134 mm (5.3 inches)72%high
November Weather9°C (48°F)48 mm (1.9 inches)82%moderate
December Weather6°C (42°F)36 mm (1.4 inches)85%moderate

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