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December Weather in Sterling, United States

Last updated: June 24, 2025

In December, the average temperature in Sterling, United States hovers around -1°C (30°F), with extremes ranging from a chilling -27°C (-17°F) to a mild 16°C (61°F). Expect about 58 mm (2.3 in) of precipitation spread over 9 days, combined with an average humidity of 86%.

December Temperature in Sterling

In December in Sterling, the average temperature is -1°C (30°F), with maximums reaching 16°C (61°F) and minimums plummeting to -27°C (-17°F). Be sure to pack warm clothing if you plan on traveling during this time!

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

The chart illustrates December temperature patterns in Sterling, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sterling, December typically has an average temperature of -1°C (30°F), with highs reaching up to 16°C (61°F) and lows dropping to around -27°C (-17°F).
JanFebMarAprMayJunJulAugSepOctNovDec232433445768737063513730
Data source: Temperature data for Sterling 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 Sterling

In Sterling in December, the precipitation amount is 58 mm (2.3 in) spread over 9 days.

December Precipitation Trends in Sterling

The chart displays monthly precipitation patterns in Sterling, 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 Sterling, December typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec50505383105908596781185758
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sterling

In Sterling in December, humidity is 86%. With an average temperature of -1°C (30°F), this humidity feels like a heavy blanket wrapping around you, making traveling feel much colder and more uncomfortable than the temperature suggests.

December Average Humidity in Sterling

This chart illustrates the average monthly humidity levels in Sterling, 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 Sterling is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sterling

In Sterling in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Sterling, you can visit Hourly UV Index in Sterling.

Maximum UV Index Levels in Sterling for December

The chart shows the monthly maximum UV Index (UVI) for Sterling 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 Sterling typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Sterling 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 Sterling Compares to Other Months

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

This table compares monthly weather conditions in Sterling, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)50 mm (2.0 inches)88%low
February Weather-5°C (24°F)50 mm (2.0 inches)87%moderate
March Weather1°C (34°F)53 mm (2.1 inches)85%moderate
April Weather7°C (45°F)83 mm (3.3 inches)86%very high
May Weather14°C (58°F)105 mm (4.1 inches)80%very high
June Weather20°C (68°F)90 mm (3.6 inches)80%very high
July Weather23°C (74°F)85 mm (3.4 inches)80%very high
August Weather21°C (71°F)96 mm (3.8 inches)80%very high
September Weather17°C (63°F)78 mm (3.1 inches)80%high
October Weather11°C (52°F)118 mm (4.7 inches)84%moderate
November Weather3°C (37°F)57 mm (2.2 inches)89%moderate
December Weather-1°C (30°F)58 mm (2.3 inches)86%low

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