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December Weather in Fort Sumner, United States

Last updated: June 24, 2025

In December, the average temperature in Fort Sumner, United States hovers around 6°C (43°F). However, you can expect a wide range, with minimums plummeting to -12°C (11°F) and maximums reaching up to 24°C (76°F). Precipitation is light, averaging just 8 mm (0.3 in) over 1 day, while the air carries a 77% humidity, creating a cool and crisp atmosphere.

December Temperature in Fort Sumner

In December in Fort Sumner, the average temperature is 6°C (43°F). The maximum can reach 24°C (76°F) and the minimum can be as low as -12°C (11°F). Travelers should be prepared for a wide range of temperatures, so packing layers is essential for comfort.

December Weather in Fort Sumner: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fort Sumner, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Sumner, December typically has an average temperature of 6°C (43°F), with highs reaching up to 24°C (76°F) and lows dropping to around -12°C (11°F).
JanFebMarAprMayJunJulAugSepOctNovDec404453607079817972595043
Data source: Temperature data for Fort Sumner 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 Fort Sumner

In Fort Sumner in December, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.

December Precipitation Trends in Fort Sumner

The chart displays monthly precipitation patterns in Fort Sumner, 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 Fort Sumner, December typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec11103017273522433152138
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fort Sumner

In Fort Sumner 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 Fort Sumner

This chart illustrates the average monthly humidity levels in Fort Sumner, 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 Fort Sumner 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 Fort Sumner

In Fort Sumner 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 Fort Sumner for better planning.

Maximum UV Index Levels in Fort Sumner for December

The chart shows the monthly maximum UV Index (UVI) for Fort Sumner 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 Fort Sumner typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213121210864
Data source: Fort Sumner 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 Fort Sumner Compares to Other Months

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

This table compares monthly weather conditions in Fort Sumner, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)11 mm (0.4 inches)74%moderate
February Weather7°C (44°F)10 mm (0.4 inches)75%high
March Weather12°C (53°F)30 mm (1.2 inches)61%very high
April Weather16°C (60°F)17 mm (0.7 inches)61%extreme
May Weather21°C (70°F)27 mm (1.1 inches)69%extreme
June Weather26°C (79°F)35 mm (1.4 inches)74%extreme
July Weather27°C (81°F)22 mm (0.9 inches)75%extreme
August Weather26°C (79°F)43 mm (1.7 inches)78%extreme
September Weather22°C (73°F)31 mm (1.2 inches)76%very high
October Weather15°C (59°F)52 mm (2.0 inches)76%very high
November Weather10°C (50°F)13 mm (0.5 inches)80%high
December Weather6°C (43°F)8 mm (0.3 inches)77%moderate

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