December Weather in Castroville, United States

Last updated: June 24, 2025

In December, the average temperature in Castroville, United States hovers around 14°C (57°F). Expect a spectrum of weather, with minimums dipping to -3°C (27°F) and maximums peaking at 30°C (86°F). During this month, you'll encounter approximately 46 mm (1.8 in) of precipitation spread across 5 days. Humidity is notably high, averaging at 86%, creating a rich, humid atmosphere throughout the duration.

December Temperature in Castroville

In December in Castroville, the average temperature is 14°C (57°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as -3°C (27°F). Be prepared for a wide range of temperatures when traveling to Castroville during this month.

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

The chart illustrates December temperature patterns in Castroville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castroville, December typically has an average temperature of 14°C (57°F), with highs reaching up to 30°C (86°F) and lows dropping to around -3°C (27°F).

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

December Precipitation in Castroville

In Castroville in December, the precipitation amount is 46 mm (1.8 in) recorded over a span of 5 days.

December Precipitation Trends in Castroville

The chart displays monthly precipitation patterns in Castroville, 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 Castroville, December typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 5 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 Castroville

In Castroville in December humidity is 86%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket enveloping you, making travel feel oppressive and uncomfortably sticky.

December Average Humidity in Castroville

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

In Castroville in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Castroville.

Maximum UV Index Levels in Castroville for December

The chart shows the monthly maximum UV Index (UVI) for Castroville 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 Castroville typically reaches 5, which falls under the moderate exposure category.

Data source: Castroville 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 Castroville Compares to Other Months

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

This table compares monthly weather conditions in Castroville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	34 mm (1.3 inches)	79%	moderate
February Weather	13°C (57°F)	47 mm (1.8 inches)	79%	very high
March Weather	19°C (66°F)	50 mm (2.0 inches)	74%	very high
April Weather	22°C (72°F)	61 mm (2.4 inches)	76%	extreme
May Weather	26°C (79°F)	109 mm (4.3 inches)	81%	extreme
June Weather	29°C (84°F)	58 mm (2.3 inches)	76%	extreme
July Weather	30°C (86°F)	52 mm (2.0 inches)	66%	extreme
August Weather	31°C (87°F)	40 mm (1.6 inches)	58%	extreme
September Weather	28°C (82°F)	106 mm (4.2 inches)	65%	extreme
October Weather	23°C (73°F)	69 mm (2.7 inches)	74%	very high
November Weather	17°C (62°F)	40 mm (1.6 inches)	81%	high
December Weather	14°C (57°F)	46 mm (1.8 inches)	86%	moderate