December Weather in Ilwaco, United States

Last updated: June 24, 2025

In December, the average temperature in Ilwaco, United States hovers around 8°C (47°F), with lows dipping to a chilly -1°C (30°F) and highs reaching a mild 13°C (56°F). Expect heavy precipitation during this time, with an average of 248 mm (9.8 in) over 21 days, contributing to a high humidity level of 87%. Be prepared for a damp and cool month!

December Temperature in Ilwaco

In December in Ilwaco, the average temperature is 8°C (47°F). Maximums can reach 13°C (56°F), and minimums can be as low as -1°C (30°F). Make sure to pack layers and be prepared for chilly conditions while exploring this destination.

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

The chart illustrates December temperature patterns in Ilwaco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ilwaco, December typically has an average temperature of 8°C (47°F), with highs reaching up to 13°C (56°F) and lows dropping to around -1°C (30°F).

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

December Precipitation in Ilwaco

In Ilwaco in December, the precipitation amount reaches 248 mm (9.8 in) over a span of 21 days.

December Precipitation Trends in Ilwaco

The chart displays monthly precipitation patterns in Ilwaco, 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 Ilwaco, December typically receives around 248 mm (9.8 inches) of precipitation spread over approximately 21 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 Ilwaco

In Ilwaco in December, humidity is 87%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration uncomfortably muggy despite the cool air.

December Average Humidity in Ilwaco

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

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

Maximum UV Index Levels in Ilwaco for December

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

Data source: Ilwaco 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 Ilwaco Compares to Other Months

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

This table compares monthly weather conditions in Ilwaco, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	242 mm (9.5 inches)	86%	low
February Weather	7°C (45°F)	193 mm (7.6 inches)	84%	moderate
March Weather	8°C (47°F)	161 mm (6.3 inches)	85%	moderate
April Weather	10°C (50°F)	132 mm (5.2 inches)	83%	high
May Weather	12°C (54°F)	66 mm (2.6 inches)	84%	very high
June Weather	14°C (58°F)	58 mm (2.3 inches)	84%	very high
July Weather	15°C (60°F)	19 mm (0.8 inches)	82%	very high
August Weather	16°C (61°F)	20 mm (0.8 inches)	73%	very high
September Weather	15°C (60°F)	84 mm (3.3 inches)	74%	high
October Weather	13°C (55°F)	156 mm (6.1 inches)	83%	moderate
November Weather	10°C (51°F)	249 mm (9.8 inches)	86%	moderate
December Weather	8°C (47°F)	248 mm (9.8 inches)	87%	low