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December Weather in Williston, United States

Last updated: June 24, 2025

In December, the average temperature in Williston, United States is a pleasant 15°C (60°F). Be prepared for the possibility of cooler nights, with minimum temperatures dipping to -4°C (26°F), while daytime can reach a balmy 29°C (84°F). Expect around 90 mm (3.6 in) of precipitation spread over 7 days, contributing to an average humidity of 86%.

December Temperature in Williston

In December in Williston, the average temperature is 15°C (60°F), with maximums reaching up to 29°C (84°F) and minimums dropping as low as -4°C (26°F). Be sure to pack accordingly to enjoy a range of weather while exploring!

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

The chart illustrates December temperature patterns in Williston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williston, December typically has an average temperature of 15°C (60°F), with highs reaching up to 29°C (84°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec576365707780818180756460
Data source: Temperature data for Williston 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 Williston

In Williston in December, the total precipitation amount is 90 mm (3.6 in) over a period of 7 days.

December Precipitation Trends in Williston

The chart displays monthly precipitation patterns in Williston, 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 Williston, December typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec5163347796168183194125775690
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Williston

In Williston in December, humidity is 86%. With an average temperature of 15°C (60°F), this humidity feels like a warm, muggy embrace that can make exploring the area feel sticky and heavy, often leading you to seek shade or cool refreshments more frequently as you navigate the sights.

December Average Humidity in Williston

This chart illustrates the average monthly humidity levels in Williston, 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 Williston is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%78%77%75%76%79%78%83%81%83%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Williston

In Williston in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Williston.

Maximum UV Index Levels in Williston for December

The chart shows the monthly maximum UV Index (UVI) for Williston 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 Williston typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111111110975
Data source: Williston 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 Williston Compares to Other Months

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

This table compares monthly weather conditions in Williston, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (57°F)51 mm (2.0 inches)83%moderate
February Weather17°C (63°F)63 mm (2.5 inches)82%very high
March Weather19°C (66°F)34 mm (1.3 inches)78%very high
April Weather21°C (71°F)77 mm (3.0 inches)77%extreme
May Weather25°C (77°F)96 mm (3.8 inches)75%extreme
June Weather27°C (80°F)168 mm (6.6 inches)76%extreme
July Weather27°C (81°F)183 mm (7.2 inches)79%extreme
August Weather27°C (81°F)194 mm (7.6 inches)78%extreme
September Weather27°C (80°F)125 mm (4.9 inches)83%very high
October Weather24°C (76°F)77 mm (3.0 inches)81%very high
November Weather18°C (65°F)56 mm (2.2 inches)83%high
December Weather15°C (60°F)90 mm (3.6 inches)86%moderate

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