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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 is a brisk 4°C (39°F). Expect a range from a chilly minimum of -13°C (9°F) to a pleasant maximum of 20°C (68°F). The month brings about 117 mm (4.6 in) of precipitation over 11 days, while humidity levels hover around a significant 87%. Prepare accordingly for the changing weather!

December Temperature in Rio Grande

In December in Rio Grande, the average temperature is 4°C (39°F). The maximum can reach 20°C (68°F) and the minimum can be as low as -13°C (9°F). Be prepared for a wide range of temperatures to make the most of your travel experience.

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 4°C (39°F), with highs reaching up to 20°C (68°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec343946556573787570594539
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 total precipitation amount reaches 117 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 117 mm (4.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec8712711113312914311011910110881117
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 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
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 Weather1°C (35°F)87 mm (3.4 inches)88%moderate
February Weather4°C (39°F)127 mm (5.0 inches)88%moderate
March Weather8°C (46°F)111 mm (4.4 inches)87%high
April Weather13°C (55°F)133 mm (5.2 inches)85%very high
May Weather19°C (66°F)128 mm (5.1 inches)81%very high
June Weather23°C (73°F)143 mm (5.6 inches)82%very high
July Weather25°C (78°F)109 mm (4.3 inches)81%very high
August Weather24°C (75°F)119 mm (4.7 inches)73%very high
September Weather21°C (71°F)101 mm (4.0 inches)73%very high
October Weather15°C (60°F)108 mm (4.3 inches)78%high
November Weather7°C (45°F)81 mm (3.2 inches)89%moderate
December Weather4°C (39°F)117 mm (4.6 inches)87%moderate

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