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December Weather in Colo, United States

Last updated: June 24, 2025

In Colo, United States, the average temperature in December hovers around -1°C (30°F), with extremes ranging from a brisk -22°C (-8°F) to a warm 22°C (73°F). Expect about 35 mm (1.4 in) of precipitation spread over 5 days, contributing to a humidity level of 83% that keeps the atmosphere notably crisp and fresh.

December Temperature in Colo

In December in Colo, the average temperature is -1°C (30°F). Maximum temperatures can reach 22°C (73°F), while minimums can drop as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures during this time.

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

The chart illustrates December temperature patterns in Colo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colo, December typically has an average temperature of -1°C (30°F), with highs reaching up to 22°C (73°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec212238486273767368523730
Data source: Temperature data for Colo 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 Colo

In Colo in December, the precipitation amount is 35 mm (1.4 in) over a span of 5 days.

December Precipitation Trends in Colo

The chart displays monthly precipitation patterns in Colo, 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 Colo, December typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec3844778315110575621151324336
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Colo

In Colo in December humidity is 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

December Average Humidity in Colo

This chart illustrates the average monthly humidity levels in Colo, 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 Colo is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Colo

In Colo 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 Colo, you can check the information here.

Maximum UV Index Levels in Colo for December

The chart shows the monthly maximum UV Index (UVI) for Colo 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 Colo typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Colo 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 Colo Compares to Other Months

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

This table compares monthly weather conditions in Colo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)38 mm (1.5 inches)78%moderate
February Weather-6°C (22°F)44 mm (1.7 inches)80%moderate
March Weather3°C (38°F)77 mm (3.0 inches)77%high
April Weather9°C (48°F)83 mm (3.3 inches)77%very high
May Weather16°C (62°F)151 mm (5.9 inches)77%very high
June Weather23°C (74°F)105 mm (4.1 inches)81%extreme
July Weather24°C (76°F)74 mm (2.9 inches)81%very high
August Weather23°C (73°F)62 mm (2.4 inches)77%very high
September Weather20°C (68°F)115 mm (4.5 inches)73%very high
October Weather11°C (52°F)132 mm (5.2 inches)75%high
November Weather3°C (38°F)43 mm (1.7 inches)85%moderate
December Weather-1°C (30°F)35 mm (1.4 inches)83%moderate

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