December Weather in Sterling, United States

Last updated: June 24, 2025

In December, the average temperature in Sterling, United States hovers around -3°C (26°F), with extremes ranging from a chilly -23°C (-10°F) to a milder 9°C (48°F). Expect significant precipitation, averaging 110 mm (4.3 in) over approximately 16 days, while the air remains quite damp with an average humidity of 98%.

December Temperature in Sterling

In December in Sterling, the average temperature is -3°C (26°F). Maximums can reach 9°C (48°F), while minimums can drop as low as -23°C (-10°F). Be prepared for cold weather and pack accordingly if you're planning a trip 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 -3°C (26°F), with highs reaching up to 9°C (48°F) and lows dropping to around -23°C (-10°F).

Data source: Temperature data for Sterling generated using information from the Copernicus Climate Change Service.

December Precipitation in Sterling

In Sterling in December, the precipitation amount is 110 mm (4.3 in) over a span of 16 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 110 mm (4.3 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Sterling

In Sterling in December humidity is 98%. With an average temperature of -3°C (26°F), this humidity feels like a biting chill that creeps into your bones, making traveling uncomfortable and potentially hazardous as you navigate through the frosty 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 98%, offering insight into how humid the weather typically is during this month.

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 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the 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 1, which falls under the low exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	53 mm (2.1 inches)	95%	low
February Weather	-5°C (23°F)	50 mm (1.9 inches)	95%	low
March Weather	-3°C (27°F)	39 mm (1.5 inches)	90%	moderate
April Weather	4°C (39°F)	36 mm (1.4 inches)	82%	moderate
May Weather	10°C (49°F)	67 mm (2.6 inches)	85%	high
June Weather	13°C (56°F)	66 mm (2.6 inches)	95%	high
July Weather	16°C (61°F)	75 mm (2.9 inches)	100%	high
August Weather	15°C (59°F)	98 mm (3.9 inches)	99%	high
September Weather	11°C (51°F)	113 mm (4.4 inches)	97%	moderate
October Weather	5°C (42°F)	127 mm (5.0 inches)	93%	low
November Weather	-2°C (28°F)	91 mm (3.6 inches)	97%	low
December Weather	-3°C (26°F)	110 mm (4.3 inches)	98%	low