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December Weather in Sterling, United States

Last updated: June 24, 2025

In Sterling, United States, the average temperature in December hovers around 0°C (32°F). Expect chilly nights, with minimums plummeting to -21°C (-6°F), while daytime highs can reach a comfortable 20°C (69°F). Be prepared for some precipitation, as 50 mm (2.0 in) is expected over approximately 6 days. Rainy days paired with an average humidity of 84% may leave the air feeling brisk, so dress accordingly!

December Temperature in Sterling

In December in Sterling, the average temperature is 0°C (32°F), with maximums reaching 20°C (69°F) and minimums dropping as low as -21°C (-6°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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 0°C (32°F), with highs reaching up to 20°C (69°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec232640496273767368543932
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 50 mm (2.0 in) over the course of 6 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 50 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec59598611015714198731151155250
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 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
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 (24°F)59 mm (2.3 inches)82%moderate
February Weather-3°C (26°F)59 mm (2.3 inches)83%moderate
March Weather4°C (40°F)86 mm (3.4 inches)84%high
April Weather9°C (49°F)110 mm (4.3 inches)85%very high
May Weather17°C (62°F)157 mm (6.2 inches)79%very high
June Weather23°C (73°F)141 mm (5.6 inches)82%very high
July Weather24°C (76°F)98 mm (3.8 inches)80%very high
August Weather23°C (73°F)73 mm (2.9 inches)81%very high
September Weather20°C (68°F)115 mm (4.5 inches)80%very high
October Weather12°C (54°F)115 mm (4.5 inches)82%high
November Weather4°C (39°F)51 mm (2.0 inches)88%moderate
December Weather0°C (32°F)50 mm (2.0 inches)84%low

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