December Weather in Valparaiso, United States

Last updated: June 24, 2025

In Valparaiso, United States, the average temperature in December hovers around 1°C (35°F). However, temperatures can dip as low as -20°C (-4°F) and rise to a maximum of 17°C (63°F). Expect a precipitation total of 63 mm (2.5 in) over about 9 days, contributing to the area's average humidity of a high 86%.

December Temperature in Valparaiso

In December in Valparaiso, the average temperature is 1°C (35°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -20°C (-4°F). Be prepared for a wide range of temperatures and pack accordingly for your travels to Valparaiso during this month.

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

The chart illustrates December temperature patterns in Valparaiso, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valparaiso, December typically has an average temperature of 1°C (35°F), with highs reaching up to 17°C (63°F) and lows dropping to around -20°C (-4°F).

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

December Precipitation in Valparaiso

In Valparaiso in December, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.

December Precipitation Trends in Valparaiso

The chart displays monthly precipitation patterns in Valparaiso, 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 Valparaiso, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Valparaiso

In Valparaiso in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.

December Average Humidity in Valparaiso

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

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

Maximum UV Index Levels in Valparaiso for December

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

Data source: Valparaiso 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 Valparaiso Compares to Other Months

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

This table compares monthly weather conditions in Valparaiso, 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)	74 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	73 mm (2.9 inches)	85%	moderate
March Weather	4°C (39°F)	101 mm (4.0 inches)	86%	high
April Weather	9°C (48°F)	113 mm (4.4 inches)	87%	very high
May Weather	16°C (60°F)	166 mm (6.5 inches)	81%	very high
June Weather	22°C (71°F)	136 mm (5.4 inches)	82%	very high
July Weather	24°C (75°F)	107 mm (4.2 inches)	81%	very high
August Weather	23°C (73°F)	102 mm (4.0 inches)	79%	very high
September Weather	20°C (68°F)	73 mm (2.9 inches)	78%	very high
October Weather	13°C (56°F)	136 mm (5.4 inches)	81%	high
November Weather	5°C (41°F)	73 mm (2.9 inches)	89%	moderate
December Weather	1°C (35°F)	63 mm (2.5 inches)	86%	low