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December Weather in Portales, United States

Last updated: June 24, 2025

In Portales, United States, the average temperature in December hovers around 6°C (43°F), with a minimum dipping to -8°C (18°F) and a potential high of 23°C (74°F). Expect light precipitation totaling about 7 mm (0.3 in) over approximately 2 days, accompanied by an average humidity of 77%. Whether you're cozying up indoors or venturing out, be prepared for a mix of conditions!

December Temperature in Portales

In December in Portales, the average temperature is 6°C (43°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop as low as -8°C (18°F). It's advisable to pack layers for your trip to Portales, as temperatures can vary widely throughout the day.

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

The chart illustrates December temperature patterns in Portales, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portales, December typically has an average temperature of 6°C (43°F), with highs reaching up to 23°C (74°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec404353596978807872594942
Data source: Temperature data for Portales 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 Portales

In Portales in December, the precipitation amount is 7 mm (0.3 in) over a period of 2 days.

December Precipitation Trends in Portales

The chart displays monthly precipitation patterns in Portales, 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 Portales, December typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec19122819334528473654117
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Portales

In Portales in December humidity is 77%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress warmly and stay active while exploring the area.

December Average Humidity in Portales

This chart illustrates the average monthly humidity levels in Portales, 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 Portales is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%75%61%62%69%74%75%78%76%76%80%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Portales

In Portales in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Portales for better planning.

Maximum UV Index Levels in Portales for December

The chart shows the monthly maximum UV Index (UVI) for Portales 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 Portales typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121210864
Data source: Portales 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 Portales Compares to Other Months

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

This table compares monthly weather conditions in Portales, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)19 mm (0.7 inches)74%moderate
February Weather6°C (43°F)12 mm (0.5 inches)75%high
March Weather11°C (53°F)28 mm (1.1 inches)61%very high
April Weather15°C (60°F)19 mm (0.7 inches)61%extreme
May Weather21°C (70°F)33 mm (1.3 inches)69%extreme
June Weather25°C (78°F)45 mm (1.8 inches)74%extreme
July Weather27°C (80°F)28 mm (1.1 inches)75%extreme
August Weather26°C (78°F)47 mm (1.9 inches)78%extreme
September Weather22°C (72°F)36 mm (1.4 inches)76%very high
October Weather15°C (59°F)54 mm (2.1 inches)76%very high
November Weather10°C (50°F)11 mm (0.4 inches)80%high
December Weather6°C (43°F)7 mm (0.3 inches)77%moderate

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