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December Weather in Rio Grande, United States

Last updated: June 24, 2025

In December, the average temperature in Rio Grande, United States hovers around 6°C (44°F). Expect a chill with minimums dipping as low as -7°C (20°F) and maximums peaking at 17°C (64°F). This month sees 118 mm (4.6 in) of precipitation over approximately 11 days, creating a humid atmosphere with an average humidity of 84%.

December Temperature in Rio Grande

In December in Rio Grande, the average temperature is 6°C (44°F). Maximums can reach 17°C (64°F), while minimums can drop to as low as -7°C (20°F). Be prepared for a mix of chilly and mild weather, making it a great time to explore the local sights while layering up for warmth.

December Weather in Rio Grande: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rio Grande, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Grande, December typically has an average temperature of 6°C (44°F), with highs reaching up to 17°C (64°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec384044536171787772645143
Data source: Temperature data for Rio Grande generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Rio Grande

In Rio Grande in December, the precipitation amount is 118 mm (4.6 in) over the course of 11 days.

December Precipitation Trends in Rio Grande

The chart displays monthly precipitation patterns in Rio Grande, 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 Rio Grande, December typically receives around 118 mm (4.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec74113111941257712911510714290118
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rio Grande

In Rio Grande in December humidity is 84%. With an average temperature of 6°C (44°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less comfortable and necessitating layered clothing to stay warm and dry while exploring the area.

December Average Humidity in Rio Grande

This chart illustrates the average monthly humidity levels in Rio Grande, 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 Rio Grande is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rio Grande

In Rio Grande 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 Rio Grande, you can check the information here.

Maximum UV Index Levels in Rio Grande for December

The chart shows the monthly maximum UV Index (UVI) for Rio Grande 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 Rio Grande typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101010108743
Data source: Rio Grande 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 Rio Grande Compares to Other Months

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

This table compares monthly weather conditions in Rio Grande, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)74 mm (2.9 inches)84%moderate
February Weather5°C (40°F)113 mm (4.4 inches)83%moderate
March Weather7°C (44°F)111 mm (4.4 inches)83%high
April Weather11°C (53°F)94 mm (3.7 inches)81%very high
May Weather16°C (61°F)125 mm (4.9 inches)78%very high
June Weather22°C (71°F)77 mm (3.0 inches)79%very high
July Weather25°C (78°F)129 mm (5.1 inches)74%very high
August Weather25°C (77°F)115 mm (4.5 inches)72%very high
September Weather22°C (72°F)107 mm (4.2 inches)75%very high
October Weather18°C (64°F)142 mm (5.6 inches)81%high
November Weather10°C (51°F)90 mm (3.5 inches)85%moderate
December Weather6°C (44°F)118 mm (4.6 inches)84%moderate

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