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December Weather in Jamestown, United States

Last updated: June 24, 2025

In December, the average temperature in Jamestown, United States hovers around -1°C (31°F), with a minimum plunge as low as -20°C (-3°F) and a maximum rise up to 16°C (62°F). Expect steady precipitation of 110 mm (4.3 in) spread over about 17 days, accompanied by a high average humidity of 88%. Prepare for a chilly and damp month!

December Temperature in Jamestown

In December in Jamestown, the average temperature is -1°C (31°F), with maximums reaching 16°C (62°F) and minimums dropping as low as -20°C (-3°F). It's essential to pack warm clothing and be prepared for a wide range of temperatures while exploring.

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

The chart illustrates December temperature patterns in Jamestown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jamestown, December typically has an average temperature of -1°C (31°F), with highs reaching up to 16°C (62°F) and lows dropping to around -20°C (-3°F).
JanFebMarAprMayJunJulAugSepOctNovDec252834455765706862523731
Data source: Temperature data for Jamestown 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 Jamestown

In Jamestown in December, the precipitation amount is 110 mm (4.3 in) spread over 17 days.

December Precipitation Trends in Jamestown

The chart displays monthly precipitation patterns in Jamestown, 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 Jamestown, December typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec10011210112713914013510690131116110
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Jamestown

In Jamestown in December, humidity is 88%. With an average temperature of -1°C (31°F), this humidity feels like a biting cold that penetrates your clothing, making outdoor exploration challenging and the air clingy, adding an extra chill that can make you feel even colder than the temperature suggests.

December Average Humidity in Jamestown

This chart illustrates the average monthly humidity levels in Jamestown, 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 Jamestown is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Jamestown

In Jamestown in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Jamestown, you can visit Hourly UV Index in Jamestown.

Maximum UV Index Levels in Jamestown for December

The chart shows the monthly maximum UV Index (UVI) for Jamestown 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 Jamestown typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Jamestown 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 Jamestown Compares to Other Months

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

This table compares monthly weather conditions in Jamestown, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)100 mm (3.9 inches)89%moderate
February Weather-2°C (28°F)112 mm (4.4 inches)90%moderate
March Weather1°C (35°F)101 mm (4.0 inches)89%high
April Weather7°C (45°F)127 mm (5.0 inches)88%very high
May Weather14°C (57°F)139 mm (5.5 inches)80%very high
June Weather18°C (66°F)140 mm (5.5 inches)79%very high
July Weather21°C (70°F)135 mm (5.3 inches)74%very high
August Weather20°C (68°F)106 mm (4.2 inches)64%very high
September Weather17°C (63°F)90 mm (3.5 inches)67%very high
October Weather11°C (52°F)131 mm (5.2 inches)81%high
November Weather3°C (38°F)116 mm (4.6 inches)89%moderate
December Weather-1°C (31°F)110 mm (4.3 inches)88%low

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