December Weather in Old Washington, United States

Last updated: June 24, 2025

In December, the average temperature in Old Washington, United States hovers around 4°C (40°F). Expect a wide range, with minimums dipping to -13°C (9°F) and maximums peaking at 21°C (69°F). Precipitation can total 121 mm (4.8 in) over approximately 10 days, contributing to an average humidity of a muggy 87%.

December Temperature in Old Washington

In December in Old Washington, the average temperature is 4°C (40°F). The maximum can reach 21°C (69°F), while the minimum can be as low as -13°C (9°F). Be prepared for a wide range of temperatures, and pack accordingly for both warm days and cold nights.

December Weather in Old Washington: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Old Washington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Old Washington, December typically has an average temperature of 4°C (40°F), with highs reaching up to 21°C (69°F) and lows dropping to around -13°C (9°F).

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

December Precipitation in Old Washington

In Old Washington in December, the precipitation amount is 121 mm (4.8 in) spread over a period of 10 days.

December Precipitation Trends in Old Washington

The chart displays monthly precipitation patterns in Old Washington, 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 Old Washington, December typically receives around 121 mm (4.8 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 Old Washington

In Old Washington in December humidity is 87%. With an average temperature of 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

December Average Humidity in Old Washington

This chart illustrates the average monthly humidity levels in Old Washington, 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 Old Washington is approximately 87%, 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 Old Washington

In Old Washington 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 Old Washington, you can check the information here.

Maximum UV Index Levels in Old Washington for December

The chart shows the monthly maximum UV Index (UVI) for Old Washington 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 Old Washington typically reaches 3, which falls under the moderate exposure category.

Data source: Old Washington 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 Old Washington Compares to Other Months

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

This table compares monthly weather conditions in Old Washington, 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 (35°F)	92 mm (3.6 inches)	88%	moderate
February Weather	4°C (40°F)	131 mm (5.1 inches)	88%	moderate
March Weather	8°C (47°F)	119 mm (4.7 inches)	87%	high
April Weather	13°C (55°F)	136 mm (5.4 inches)	85%	very high
May Weather	19°C (66°F)	128 mm (5.1 inches)	81%	very high
June Weather	23°C (73°F)	173 mm (6.8 inches)	82%	very high
July Weather	25°C (77°F)	114 mm (4.5 inches)	81%	very high
August Weather	24°C (75°F)	95 mm (3.7 inches)	73%	very high
September Weather	21°C (71°F)	114 mm (4.5 inches)	73%	very high
October Weather	15°C (60°F)	107 mm (4.2 inches)	78%	high
November Weather	7°C (45°F)	83 mm (3.3 inches)	89%	moderate
December Weather	4°C (40°F)	121 mm (4.8 inches)	87%	moderate