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December Weather in Grayson Valley, United States

Last updated: June 24, 2025

The average temperature in Grayson Valley, United States during December is a brisk 9°C (49°F), with a minimum dipping to -6°C (22°F) and a potential maximum soaring to 24°C (75°F). Expect precipitation to amount to 147 mm (5.8 in) over 12 days, contributing to a high humidity level of 88%. Stay prepared for varied weather conditions!

December Temperature in Grayson Valley

In December in Grayson Valley, the average temperature is 9°C (49°F). The maximum can reach 24°C (75°F) and the minimum can be as low as -6°C (22°F). Pack accordingly to enjoy a range of weather while exploring Grayson Valley.

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

The chart illustrates December temperature patterns in Grayson Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grayson Valley, December typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (75°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec465157637277818076675249
Data source: Temperature data for Grayson 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 Grayson Valley

In Grayson Valley in December, the precipitation amount is 147 mm (5.8 in) over a span of 12 days.

December Precipitation Trends in Grayson Valley

The chart displays monthly precipitation patterns in Grayson 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 Grayson Valley, December typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec118180164154991341011168913181147
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grayson Valley

In Grayson Valley in December, humidity is 88%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

December Average Humidity in Grayson Valley

This chart illustrates the average monthly humidity levels in Grayson 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 Grayson 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 Grayson Valley

In Grayson 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 Grayson Valley for better planning.

Maximum UV Index Levels in Grayson Valley for December

The chart shows the monthly maximum UV Index (UVI) for Grayson 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 Grayson Valley typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119764
Data source: Grayson 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 Grayson Valley Compares to Other Months

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

This table compares monthly weather conditions in Grayson Valley, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)118 mm (4.6 inches)85%moderate
February Weather11°C (52°F)180 mm (7.1 inches)84%high
March Weather14°C (58°F)164 mm (6.5 inches)82%very high
April Weather17°C (63°F)154 mm (6.0 inches)82%very high
May Weather22°C (72°F)99 mm (3.9 inches)81%extreme
June Weather25°C (78°F)134 mm (5.3 inches)77%extreme
July Weather27°C (81°F)101 mm (4.0 inches)77%extreme
August Weather27°C (80°F)116 mm (4.6 inches)72%extreme
September Weather25°C (77°F)89 mm (3.5 inches)73%very high
October Weather19°C (67°F)131 mm (5.1 inches)73%high
November Weather11°C (53°F)81 mm (3.2 inches)85%high
December Weather9°C (49°F)147 mm (5.8 inches)88%moderate

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