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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 -7°C (19°F). Be prepared for extremes, as temperatures can dip as low as -32°C (-25°F) or rise to a maximum of 12°C (54°F). Expect around 35 mm (1.4 in) of precipitation spread over 7 days, with an average humidity level of 84%.

December Temperature in Jamestown

In December in Jamestown, the average temperature is -7°C (19°F). The maximum can reach 12°C (54°F) and the minimum can be as low as -32°C (-25°F). Travelers should be prepared for significant temperature fluctuations and dress warmly during this time.

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 -7°C (19°F), with highs reaching up to 12°C (54°F) and lows dropping to around -32°C (-25°F).
JanFebMarAprMayJunJulAugSepOctNovDec12927385568716859432919
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 35 mm (1.4 in) over the course of 7 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 35 mm (1.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec1719253856838710471741935
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 84%. With an average temperature of -7°C (19°F), this humidity feels like a biting chill that cuts through layers of clothing, making outdoor travel uncomfortable and prompting a need for frequent warm breaks indoors.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%89%82%79%74%78%76%77%72%74%85%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
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-11°C (12°F)17 mm (0.7 inches)87%low
February Weather-13°C (10°F)19 mm (0.8 inches)89%moderate
March Weather-3°C (27°F)25 mm (1.0 inches)82%moderate
April Weather4°C (39°F)38 mm (1.5 inches)79%very high
May Weather13°C (55°F)56 mm (2.2 inches)74%very high
June Weather20°C (68°F)83 mm (3.2 inches)78%very high
July Weather22°C (72°F)87 mm (3.4 inches)76%very high
August Weather20°C (68°F)104 mm (4.1 inches)77%very high
September Weather15°C (60°F)71 mm (2.8 inches)72%high
October Weather6°C (43°F)74 mm (2.9 inches)74%moderate
November Weather-2°C (29°F)19 mm (0.7 inches)85%moderate
December Weather-7°C (19°F)35 mm (1.4 inches)84%low

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