December Weather in Saint Helen, United States

Last updated: June 24, 2025

In December, the average temperature in Saint Helen, United States hovers around -2°C (28°F). Expect chilly lows of -22°C (-8°F) and mild highs of 15°C (59°F). With an average humidity of 89% and 62 mm (2.4 in) of precipitation spread over 10 days, it’s a month best spent bundled up and enjoying the cozy indoors!

December Temperature in Saint Helen

In December in Saint Helen, the average temperature is -2°C (28°F). Maximum temperatures can reach 15°C (59°F), while minimums can drop as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in Saint Helen: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Saint Helen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Helen, December typically has an average temperature of -2°C (28°F), with highs reaching up to 15°C (59°F) and lows dropping to around -22°C (-8°F).

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

December Precipitation in Saint Helen

In Saint Helen in December, the total precipitation amount is 62 mm (2.4 in) over a period of 10 days.

December Precipitation Trends in Saint Helen

The chart displays monthly precipitation patterns in Saint Helen, 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 Saint Helen, December typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 10 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 Saint Helen

In Saint Helen in December, humidity is 89%. With an average temperature of -2°C (28°F), this humidity feels like a heavy blanket, making it difficult to stay warm while traveling outdoors.

December Average Humidity in Saint Helen

This chart illustrates the average monthly humidity levels in Saint Helen, 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 Saint Helen is approximately 89%, 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 Saint Helen

In Saint Helen 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 Saint Helen, you can visit Hourly UV Index in Saint Helen.

Maximum UV Index Levels in Saint Helen for December

The chart shows the monthly maximum UV Index (UVI) for Saint Helen 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 Saint Helen typically reaches 2, which falls under the low exposure category.

Data source: Saint Helen 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 Saint Helen Compares to Other Months

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

This table compares monthly weather conditions in Saint Helen, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	51 mm (2.0 inches)	92%	low
February Weather	-6°C (22°F)	51 mm (2.0 inches)	91%	moderate
March Weather	0°C (32°F)	54 mm (2.1 inches)	87%	moderate
April Weather	6°C (43°F)	94 mm (3.7 inches)	85%	very high
May Weather	13°C (56°F)	111 mm (4.4 inches)	79%	very high
June Weather	19°C (66°F)	114 mm (4.5 inches)	75%	very high
July Weather	22°C (72°F)	91 mm (3.6 inches)	75%	very high
August Weather	20°C (69°F)	89 mm (3.5 inches)	75%	very high
September Weather	16°C (61°F)	76 mm (3.0 inches)	79%	high
October Weather	10°C (49°F)	124 mm (4.9 inches)	85%	moderate
November Weather	2°C (35°F)	58 mm (2.3 inches)	88%	moderate
December Weather	-2°C (28°F)	62 mm (2.4 inches)	89%	low