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December Weather in Rio Grande City, United States

Last updated: June 24, 2025

In December, the average temperature in Rio Grande City, United States hovers around 17°C (64°F). Expect a minimum of 1°C (34°F) and a maximum of 34°C (93°F). During this time, precipitation averages about 20 mm (0.8 in) spread over 3 days, with an average humidity level of 86%.

December Temperature in Rio Grande City

In December in Rio Grande City, the average temperature is 17°C (64°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 1°C (34°F). This makes it essential to pack layers and be prepared for varying weather conditions while exploring the area.

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

The chart illustrates December temperature patterns in Rio Grande City, 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 City, December typically has an average temperature of 17°C (64°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec616572788386878884776863
Data source: Temperature data for Rio Grande City 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 City

In Rio Grande City in December, the precipitation amount is 20 mm (0.8 in) accumulated over a period of 3 days.

December Precipitation Trends in Rio Grande City

The chart displays monthly precipitation patterns in Rio Grande City, 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 City, December typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec181829327879731697383721
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rio Grande City

In Rio Grande City in December humidity is 86%. With an average temperature of 17°C (64°F), this humidity feels like a warm blanket enveloping you, making travel quite uncomfortable as the moisture clings to your skin and the air feels thick, damp, and heavy.

December Average Humidity in Rio Grande City

This chart illustrates the average monthly humidity levels in Rio Grande City, 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 City is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rio Grande City

In Rio Grande City in December, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Rio Grande City, you can refer to this Hourly UV Index in Rio Grande City.

Maximum UV Index Levels in Rio Grande City for December

The chart shows the monthly maximum UV Index (UVI) for Rio Grande City 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 City typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6910111212121211976
Data source: Rio Grande City 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 City Compares to Other Months

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

This table compares monthly weather conditions in Rio Grande City, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)18 mm (0.7 inches)83%high
February Weather18°C (65°F)18 mm (0.7 inches)79%very high
March Weather22°C (72°F)29 mm (1.1 inches)76%very high
April Weather25°C (78°F)32 mm (1.3 inches)77%extreme
May Weather28°C (83°F)77 mm (3.0 inches)80%extreme
June Weather30°C (86°F)79 mm (3.1 inches)73%extreme
July Weather30°C (87°F)73 mm (2.9 inches)66%extreme
August Weather31°C (89°F)16 mm (0.6 inches)65%extreme
September Weather29°C (84°F)97 mm (3.8 inches)73%extreme
October Weather25°C (77°F)37 mm (1.5 inches)76%very high
November Weather20°C (69°F)37 mm (1.5 inches)80%high
December Weather17°C (64°F)20 mm (0.8 inches)86%high

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