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December Weather in Sylva, United States

Last updated: June 24, 2025

In December, the average temperature in Sylva, United States is a brisk 5°C (41°F), with extremes ranging from a chilly -13°C (8°F) to a pleasant 22°C (72°F). Expect 143 mm (5.6 in) of precipitation spread over about 11 days, contributing to an overall average humidity of 88%. Be prepared for damp conditions as you explore this beautiful destination!

December Temperature in Sylva

In December in Sylva, the average temperature is 5°C (41°F), with maximums reaching up to 22°C (72°F) and minimums dropping as low as -13°C (8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for their visit.

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

The chart illustrates December temperature patterns in Sylva, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sylva, December typically has an average temperature of 5°C (41°F), with highs reaching up to 22°C (72°F) and lows dropping to around -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec374347546267706966574541
Data source: Temperature data for Sylva 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 Sylva

In Sylva in December, the total precipitation amount reaches 143 mm (5.6 in) over the course of 11 days.

December Precipitation Trends in Sylva

The chart displays monthly precipitation patterns in Sylva, 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 Sylva, December typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1111741351361319610012812415093143
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sylva

In Sylva in December humidity is 88%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making it essential to bundle up for your travels, as every breath feels heavy in the air and the landscape appears cloaked in a misty shroud.

December Average Humidity in Sylva

This chart illustrates the average monthly humidity levels in Sylva, 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 Sylva is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sylva

In Sylva 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 Sylva for better planning.

Maximum UV Index Levels in Sylva for December

The chart shows the monthly maximum UV Index (UVI) for Sylva 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 Sylva typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111211111110864
Data source: Sylva 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 Sylva Compares to Other Months

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

This table compares monthly weather conditions in Sylva, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)111 mm (4.4 inches)86%moderate
February Weather6°C (43°F)174 mm (6.9 inches)86%high
March Weather8°C (47°F)135 mm (5.3 inches)86%very high
April Weather12°C (54°F)136 mm (5.3 inches)82%extreme
May Weather16°C (62°F)131 mm (5.1 inches)85%extreme
June Weather19°C (67°F)95 mm (3.8 inches)85%extreme
July Weather21°C (70°F)100 mm (4.0 inches)83%extreme
August Weather21°C (69°F)128 mm (5.1 inches)76%extreme
September Weather19°C (66°F)124 mm (4.9 inches)76%very high
October Weather14°C (58°F)150 mm (5.9 inches)80%very high
November Weather7°C (45°F)93 mm (3.7 inches)88%high
December Weather5°C (41°F)143 mm (5.6 inches)88%moderate

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