December Weather in Sterling, United States

Last updated: June 24, 2025

In December, the average temperature in Sterling, United States hovers around 2°C (35°F). Expect a range of temperatures, with minimums plummeting to -18°C (-1°F) and maximums rising to a pleasant 23°C (74°F). You might experience an average precipitation of 10 mm (0.4 in) over the span of 2 days, coupled with a comfortable average humidity of 77%.

December Temperature in Sterling

In December in Sterling, the average temperature is 2°C (35°F). Maximums can reach 23°C (74°F) and minimums can be as low as -18°C (-1°F). Be prepared for a wide range of temperatures if you're planning to travel 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 2°C (35°F), with highs reaching up to 23°C (74°F) and lows dropping to around -18°C (-1°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 10 mm (0.4 in) over a period of 2 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 10 mm (0.4 inches) of precipitation spread over approximately 2 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 77%. With an average temperature of 2°C (35°F), this humidity feels like a heavy blanket against the skin, making outdoor activities feel far chillier than the thermometer suggests, which can be quite challenging for traveling.

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 77%, 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 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 Sterling, you can check the information here.

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 3, which falls under the moderate 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	0°C (33°F)	10 mm (0.4 inches)	72%	moderate
February Weather	-1°C (31°F)	16 mm (0.6 inches)	76%	moderate
March Weather	6°C (43°F)	56 mm (2.2 inches)	61%	high
April Weather	10°C (50°F)	52 mm (2.1 inches)	60%	very high
May Weather	15°C (59°F)	105 mm (4.1 inches)	74%	very high
June Weather	22°C (72°F)	42 mm (1.7 inches)	82%	extreme
July Weather	25°C (77°F)	41 mm (1.6 inches)	82%	extreme
August Weather	23°C (74°F)	28 mm (1.1 inches)	84%	very high
September Weather	20°C (68°F)	25 mm (1.0 inches)	75%	very high
October Weather	10°C (50°F)	25 mm (1.0 inches)	73%	high
November Weather	6°C (43°F)	15 mm (0.6 inches)	74%	moderate
December Weather	2°C (35°F)	10 mm (0.4 inches)	77%	moderate