December Weather in Harlan, United States

Last updated: June 24, 2025

In December, the average temperature in Harlan, United States hovers around 1°C (34°F). Expect minimum temperatures plunging to -21°C (-6°F), while the maximum can reach a mild 17°C (62°F). This month also sees an average precipitation of 59 mm (2.3 in) over about 9 days, and you'll likely experience a high humidity level of 86%.

December Temperature in Harlan

In December in Harlan, the average temperature is 1°C (34°F), with maximums reaching 17°C (62°F) and minimums dropping as low as -21°C (-6°F). Be prepared for a wide range of temperatures during your travels.

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

The chart illustrates December temperature patterns in Harlan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlan, December typically has an average temperature of 1°C (34°F), with highs reaching up to 17°C (62°F) and lows dropping to around -21°C (-6°F).

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

December Precipitation in Harlan

In Harlan in December, the precipitation amount is 59 mm (2.3 in) over the course of 9 days.

December Precipitation Trends in Harlan

The chart displays monthly precipitation patterns in Harlan, 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 Harlan, December typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 9 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 Harlan

In Harlan in December, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

December Average Humidity in Harlan

This chart illustrates the average monthly humidity levels in Harlan, 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 Harlan is approximately 86%, 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 Harlan

In Harlan 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 Harlan, you can visit Hourly UV Index in Harlan.

Maximum UV Index Levels in Harlan for December

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

Data source: Harlan 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 Harlan Compares to Other Months

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

This table compares monthly weather conditions in Harlan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	72 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	76 mm (3.0 inches)	85%	moderate
March Weather	4°C (40°F)	101 mm (4.0 inches)	86%	high
April Weather	9°C (49°F)	96 mm (3.8 inches)	87%	very high
May Weather	17°C (62°F)	129 mm (5.1 inches)	81%	very high
June Weather	22°C (72°F)	126 mm (5.0 inches)	82%	very high
July Weather	24°C (76°F)	104 mm (4.1 inches)	81%	very high
August Weather	23°C (73°F)	100 mm (3.9 inches)	79%	very high
September Weather	20°C (68°F)	64 mm (2.5 inches)	78%	very high
October Weather	13°C (56°F)	104 mm (4.1 inches)	81%	high
November Weather	5°C (41°F)	81 mm (3.2 inches)	89%	moderate
December Weather	1°C (34°F)	59 mm (2.3 inches)	86%	low