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December Weather in Valley, United States

Last updated: June 24, 2025

In December, the average temperature in Valley, United States hovers around 10°C (51°F). Expect a range from a chilly -5°C (24°F) to a pleasant 25°C (77°F). With 144 mm (5.7 in) of precipitation spread over 12 days, it’s wise to carry an umbrella. The average humidity during this time is a high 88%, giving the air a refreshing, if somewhat damp, quality.

December Temperature in Valley

In December in Valley, the average temperature is 10°C (51°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop as low as -5°C (24°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates December temperature patterns in Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valley, December typically has an average temperature of 10°C (51°F), with highs reaching up to 25°C (77°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec485459647278807977685551
Data source: Temperature data for Valley 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 Valley

In Valley in December, the precipitation amount is 144 mm (5.7 in) over the course of 12 days.

December Precipitation Trends in Valley

The chart displays monthly precipitation patterns in Valley, 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 Valley, December typically receives around 144 mm (5.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec11713010411612312711313410611082144
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Valley

In Valley in December, humidity is 88%. With an average temperature of 10°C (51°F), this humidity feels like a thick blanket of moisture enveloping you, making every step feel heavier and leaving you yearning for a refreshing breeze as you navigate the streets.

December Average Humidity in Valley

This chart illustrates the average monthly humidity levels in Valley, 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 Valley is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Valley

In Valley 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 Valley for better planning.

Maximum UV Index Levels in Valley for December

The chart shows the monthly maximum UV Index (UVI) for Valley 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 Valley typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Valley 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 Valley Compares to Other Months

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

This table compares monthly weather conditions in Valley, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)117 mm (4.6 inches)85%moderate
February Weather12°C (54°F)130 mm (5.1 inches)84%high
March Weather15°C (59°F)104 mm (4.1 inches)82%very high
April Weather18°C (64°F)116 mm (4.6 inches)82%very high
May Weather22°C (73°F)123 mm (4.8 inches)81%extreme
June Weather25°C (78°F)127 mm (5.0 inches)77%extreme
July Weather27°C (80°F)113 mm (4.4 inches)77%extreme
August Weather26°C (80°F)134 mm (5.3 inches)72%extreme
September Weather25°C (77°F)106 mm (4.2 inches)73%very high
October Weather20°C (69°F)110 mm (4.3 inches)73%very high
November Weather13°C (55°F)82 mm (3.2 inches)85%high
December Weather10°C (51°F)144 mm (5.7 inches)88%moderate

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