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December Weather in South Williamson, United States

Last updated: June 24, 2025

In South Williamson, United States, the average temperature in December hovers around 5°C (42°F), with a minimum dropping to a chilly -13°C (9°F) and a maximum reaching a pleasant 20°C (69°F). Expect substantial rainfall, totaling about 126 mm (4.9 in) over approximately 12 days. Additionally, the average humidity remains high at 86%, adding to the region's unique climate character.

December Temperature in South Williamson

In December in South Williamson, the average temperature is 5°C (42°F), with maximums reaching up to 20°C (69°F) and minimums dropping as low as -13°C (9°F). It's advisable to pack layers and prepare for fluctuating weather conditions while traveling in this area.

December Weather in South Williamson: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South Williamson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Williamson, December typically has an average temperature of 5°C (42°F), with highs reaching up to 20°C (69°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec374248566672767470604642
Data source: Temperature data for South Williamson 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 South Williamson

In South Williamson in December, the precipitation amount is 126 mm (4.9 in) spread over a span of 12 days.

December Precipitation Trends in South Williamson

The chart displays monthly precipitation patterns in South Williamson, 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 South Williamson, December typically receives around 126 mm (4.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec10217012913313615811912110712481126
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Williamson

In South Williamson in December, humidity is 86%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that penetrates your layers, making outdoor activities quite uncomfortable and prompting you to seek warmth indoors more often.

December Average Humidity in South Williamson

This chart illustrates the average monthly humidity levels in South Williamson, 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 South Williamson is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in South Williamson

In South Williamson 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 South Williamson, you can check the information here.

Maximum UV Index Levels in South Williamson for December

The chart shows the monthly maximum UV Index (UVI) for South Williamson 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 South Williamson typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101011109753
Data source: South Williamson 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 South Williamson Compares to Other Months

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

This table compares monthly weather conditions in South Williamson, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)101 mm (4.0 inches)87%moderate
February Weather6°C (43°F)170 mm (6.7 inches)87%high
March Weather9°C (48°F)129 mm (5.1 inches)86%high
April Weather13°C (56°F)133 mm (5.2 inches)84%very high
May Weather19°C (66°F)136 mm (5.4 inches)83%very high
June Weather22°C (72°F)158 mm (6.2 inches)83%very high
July Weather25°C (76°F)119 mm (4.7 inches)79%extreme
August Weather23°C (74°F)121 mm (4.8 inches)66%very high
September Weather21°C (70°F)107 mm (4.2 inches)68%very high
October Weather16°C (61°F)124 mm (4.9 inches)78%high
November Weather8°C (46°F)81 mm (3.2 inches)89%moderate
December Weather5°C (42°F)126 mm (4.9 inches)86%moderate

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