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December Weather in Arco, United States

Last updated: June 24, 2025

In Arco, United States, the average temperature in December hovers around -8°C (18°F), with possible extremes ranging from a frigid -25°C (-12°F) to a mild 9°C (49°F). Expect 24 mm (0.9 in) of precipitation over about 6 days, accompanied by high humidity levels averaging 87%. Embrace the chill while enjoying the serene atmosphere of this wintery month!

December Temperature in Arco

In December in Arco, the average temperature is -8°C (18°F), with maximums reaching 9°C (49°F) and minimums dipping as low as -25°C (-12°F). Travelers should be prepared for cold weather conditions and dress warmly for outdoor activities.

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

The chart illustrates December temperature patterns in Arco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arco, December typically has an average temperature of -8°C (18°F), with highs reaching up to 9°C (49°F) and lows dropping to around -25°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec151930405162736959423117
Data source: Temperature data for Arco 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 Arco

In Arco in December, the total precipitation amount is 24 mm (0.9 in) over a span of 6 days.

December Precipitation Trends in Arco

The chart displays monthly precipitation patterns in Arco, 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 Arco, December typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec29403031503271622332224
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Arco

In Arco in December, humidity is 87%. With an average temperature of -8°C (18°F), this humidity feels like a biting chill that seeps into your bones, making it crucial for travelers to bundle up in layers to combat the damp cold and stay comfortable while exploring.

December Average Humidity in Arco

This chart illustrates the average monthly humidity levels in Arco, 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 Arco is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Arco

In Arco 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 Arco, you can check the information here.

Maximum UV Index Levels in Arco for December

The chart shows the monthly maximum UV Index (UVI) for Arco 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 Arco typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Arco 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 Arco Compares to Other Months

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

This table compares monthly weather conditions in Arco, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)29 mm (1.1 inches)91%moderate
February Weather-7°C (19°F)40 mm (1.6 inches)92%moderate
March Weather-1°C (30°F)30 mm (1.2 inches)85%high
April Weather4°C (40°F)31 mm (1.2 inches)76%very high
May Weather11°C (51°F)50 mm (2.0 inches)66%very high
June Weather17°C (63°F)32 mm (1.3 inches)62%extreme
July Weather23°C (73°F)7 mm (0.3 inches)53%extreme
August Weather21°C (70°F)16 mm (0.6 inches)42%very high
September Weather15°C (60°F)22 mm (0.9 inches)46%very high
October Weather6°C (42°F)33 mm (1.3 inches)64%high
November Weather0°C (31°F)22 mm (0.9 inches)83%moderate
December Weather-8°C (18°F)24 mm (0.9 inches)87%moderate

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