December Weather in Harbor, United States

Last updated: June 24, 2025

In December, the average temperature in Harbor, United States hovers around 9°C (49°F). Expect a minimum chill of 3°C (37°F) and a pleasant maximum of 17°C (63°F). This month also brings significant precipitation, with about 237 mm (9.3 in) falling over 15 days, contributing to an average humidity of 86%. Be prepared for a mix of cool and wet weather!

December Temperature in Harbor

In December in Harbor, the average temperature is 9°C (49°F). Maximum temperatures can reach 17°C (63°F), while minimum temperatures can dip as low as 3°C (37°F). This mild climate makes Harbor an inviting destination for travelers seeking to enjoy outdoor activities and explore the local scenery.

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

The chart illustrates December temperature patterns in Harbor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harbor, December typically has an average temperature of 9°C (49°F), with highs reaching up to 17°C (63°F) and lows dropping to around 3°C (37°F).

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

December Precipitation in Harbor

In Harbor in December, the total precipitation amount is 237 mm (9.3 in) recorded over a period of 15 days.

December Precipitation Trends in Harbor

The chart displays monthly precipitation patterns in Harbor, 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 Harbor, December typically receives around 237 mm (9.3 inches) of precipitation spread over approximately 15 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 Harbor

In Harbor in December, humidity is 86%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill in the air, making travel uncomfortable as the moisture clings to your skin and thickens the atmosphere, creating a sense of heaviness that can tire you quickly.

December Average Humidity in Harbor

This chart illustrates the average monthly humidity levels in Harbor, 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 Harbor 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 Harbor

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

Maximum UV Index Levels in Harbor for December

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

Data source: Harbor 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 Harbor Compares to Other Months

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

This table compares monthly weather conditions in Harbor, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	301 mm (11.8 inches)	86%	moderate
February Weather	9°C (48°F)	270 mm (10.6 inches)	85%	moderate
March Weather	9°C (48°F)	207 mm (8.1 inches)	85%	high
April Weather	11°C (52°F)	165 mm (6.5 inches)	82%	very high
May Weather	13°C (55°F)	68 mm (2.7 inches)	81%	very high
June Weather	16°C (61°F)	36 mm (1.4 inches)	79%	very high
July Weather	18°C (65°F)	1 mm (0.0 inches)	70%	very high
August Weather	19°C (66°F)	4 mm (0.2 inches)	60%	very high
September Weather	17°C (63°F)	59 mm (2.3 inches)	62%	very high
October Weather	14°C (58°F)	93 mm (3.7 inches)	72%	high
November Weather	11°C (53°F)	213 mm (8.4 inches)	87%	moderate
December Weather	9°C (49°F)	237 mm (9.3 inches)	86%	low