December Weather in Mercedes, Costa Rica

Last updated: August 23, 2025

In Mercedes, Costa Rica, the average temperature for December hovers around 19°C (67°F), with a comfortable range from a minimum of 13°C (57°F) to a maximum of 26°C (78°F). Expect some rain, as the area receives an average precipitation of 191 mm (7.5 in) over 27 days. Humidity levels are relatively high, averaging at 72%, making it a great time to enjoy the lush surroundings!

December Temperature in Mercedes

In December in Mercedes, the average temperature is 19°C (67°F). Maximums can reach 26°C (78°F), and minimums can be as low as 13°C (57°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates December temperature patterns in Mercedes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercedes, December typically has an average temperature of 19°C (67°F), with highs reaching up to 26°C (78°F) and lows dropping to around 13°C (57°F).

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

December Precipitation in Mercedes

In Mercedes in December, the precipitation amount is 191 mm (7.5 in) spread over 27 days.

December Precipitation Trends in Mercedes

The chart displays monthly precipitation patterns in Mercedes, 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 Mercedes, December typically receives around 191 mm (7.5 inches) of precipitation spread over approximately 27 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 Mercedes

In Mercedes in December, humidity is 72%. With an average temperature of 19°C (67°F), this humidity feels like a warm, damp blanket enveloping you, making outdoor activities a bit more challenging but also giving the air a refreshing quality that's invigorating for short excursions.

December Average Humidity in Mercedes

This chart illustrates the average monthly humidity levels in Mercedes, 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 Mercedes is approximately 72%, 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 Mercedes

In Mercedes in December, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Mercedes.

Maximum UV Index Levels in Mercedes for December

The chart shows the monthly maximum UV Index (UVI) for Mercedes 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 Mercedes typically reaches 11, which falls under the extreme exposure category.

Data source: Mercedes 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 Mercedes Compares to Other Months

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

This table compares monthly weather conditions in Mercedes, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	19°C (67°F)	89 mm (3.5 inches)	68%	extreme
February Weather	20°C (68°F)	44 mm (1.8 inches)	68%	extreme
March Weather	20°C (68°F)	57 mm (2.3 inches)	66%	extreme
April Weather	20°C (69°F)	251 mm (9.9 inches)	67%	extreme
May Weather	20°C (69°F)	609 mm (24.0 inches)	69%	extreme
June Weather	20°C (69°F)	568 mm (22.4 inches)	84%	extreme
July Weather	20°C (69°F)	477 mm (18.8 inches)	85%	extreme
August Weather	20°C (68°F)	589 mm (23.2 inches)	82%	extreme
September Weather	20°C (68°F)	536 mm (21.1 inches)	81%	extreme
October Weather	20°C (68°F)	802 mm (31.6 inches)	80%	extreme
November Weather	20°C (67°F)	620 mm (24.4 inches)	80%	extreme
December Weather	19°C (67°F)	191 mm (7.5 inches)	72%	extreme