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December Weather in Walnut, United States

Last updated: June 24, 2025

In December, the average temperature in Walnut, United States hovers around 8°C (47°F). Expect a wide range, with minimums dipping to -9°C (16°F) and maximums reaching 24°C (76°F). Be prepared for 147 mm (5.8 in) of precipitation spread over approximately 10 days, and a notably high average humidity of 88%.

December Temperature in Walnut

In December in Walnut, the average temperature is 8°C (47°F). Maximums can reach 24°C (76°F), while minimums can drop to as low as -9°C (16°F). Be prepared for varied weather conditions during your travels!

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

The chart illustrates December temperature patterns in Walnut, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walnut, December typically has an average temperature of 8°C (47°F), with highs reaching up to 24°C (76°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec424655607178817975645047
Data source: Temperature data for Walnut 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 Walnut

In Walnut in December, the precipitation amount is 147 mm (5.8 in) over the course of 10 days.

December Precipitation Trends in Walnut

The chart displays monthly precipitation patterns in Walnut, 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 Walnut, December typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10717615714810911213111612211379147
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Walnut

In Walnut in December, humidity is 88%. With an average temperature of 8°C (47°F), this humidity feels like a thick, damp blanket wrapping around you, making even short walks feel heavy and uninviting for travel.

December Average Humidity in Walnut

This chart illustrates the average monthly humidity levels in Walnut, 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 Walnut is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%81%83%83%80%74%70%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Walnut

In Walnut in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Walnut, you can check the information here.

Maximum UV Index Levels in Walnut for December

The chart shows the monthly maximum UV Index (UVI) for Walnut 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 Walnut typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
Data source: Walnut 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 Walnut Compares to Other Months

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

This table compares monthly weather conditions in Walnut, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)107 mm (4.2 inches)86%moderate
February Weather8°C (47°F)176 mm (6.9 inches)85%high
March Weather13°C (55°F)157 mm (6.2 inches)84%very high
April Weather16°C (61°F)148 mm (5.8 inches)81%very high
May Weather22°C (71°F)109 mm (4.3 inches)83%extreme
June Weather26°C (78°F)112 mm (4.4 inches)83%extreme
July Weather27°C (81°F)131 mm (5.2 inches)80%extreme
August Weather26°C (79°F)116 mm (4.6 inches)73%very high
September Weather24°C (76°F)122 mm (4.8 inches)70%very high
October Weather18°C (65°F)113 mm (4.4 inches)73%high
November Weather10°C (50°F)79 mm (3.1 inches)85%moderate
December Weather8°C (47°F)147 mm (5.8 inches)88%moderate

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