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December Weather in Littleton, United States

Last updated: June 24, 2025

In Littleton, United States, the average temperature in December hovers around 8°C (46°F). Visitors should prepare for potential lows of -8°C (18°F) and highs reaching up to 23°C (74°F). Expect a precipitation amount of 97 mm (3.8 in) over approximately 9 days, and note that the average humidity sits at a high 85%, making for a damp and chilly atmosphere.

December Temperature in Littleton

In December in Littleton, the average temperature is 8°C (46°F). The maximum can reach 23°C (74°F), while the minimum can drop as low as -8°C (18°F). Be prepared for a wide range of temperatures when planning your travels during this time.

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

The chart illustrates December temperature patterns in Littleton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Littleton, December typically has an average temperature of 8°C (46°F), with highs reaching up to 23°C (74°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec424752616976807874655146
Data source: Temperature data for Littleton 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 Littleton

In Littleton in December, the total precipitation amount reaches 97 mm (3.8 in) over the course of 9 days.

December Precipitation Trends in Littleton

The chart displays monthly precipitation patterns in Littleton, 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 Littleton, December typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8911086104124128116151115968097
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Littleton

In Littleton in December humidity is 85%. With an average temperature of 8°C (46°F), this humidity feels like a cold, damp embrace that can leave travelers feeling chilled and uncomfortable, making outdoor exploration less appealing and encouraging the search for cozy indoor activities instead.

December Average Humidity in Littleton

This chart illustrates the average monthly humidity levels in Littleton, 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 Littleton is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%84%82%83%83%79%77%75%81%87%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Littleton

In Littleton 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 Littleton, you can check the information here.

Maximum UV Index Levels in Littleton for December

The chart shows the monthly maximum UV Index (UVI) for Littleton 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 Littleton typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4689101111109853
Data source: Littleton 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 Littleton Compares to Other Months

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

This table compares monthly weather conditions in Littleton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)89 mm (3.5 inches)84%moderate
February Weather8°C (47°F)110 mm (4.3 inches)84%high
March Weather11°C (52°F)86 mm (3.4 inches)84%very high
April Weather16°C (61°F)104 mm (4.1 inches)82%very high
May Weather21°C (70°F)124 mm (4.9 inches)82%very high
June Weather24°C (76°F)128 mm (5.0 inches)83%extreme
July Weather27°C (80°F)116 mm (4.6 inches)79%extreme
August Weather26°C (78°F)151 mm (5.9 inches)77%very high
September Weather23°C (74°F)115 mm (4.5 inches)75%very high
October Weather18°C (65°F)96 mm (3.8 inches)81%very high
November Weather10°C (51°F)80 mm (3.2 inches)87%moderate
December Weather8°C (46°F)97 mm (3.8 inches)85%moderate

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