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December Weather in Jamestown, United States

Last updated: June 24, 2025

In Jamestown, United States, the average temperature in December hovers around 2°C (37°F), with nighttime lows dipping to a chilling -18°C (0°F) and daytime highs reaching a pleasant 18°C (65°F). Expect about 102 mm (4.0 in) of precipitation spread over 10 days, contributing to the region's notable average humidity of 87%.

December Temperature in Jamestown

In December in Jamestown, the average temperature is 2°C (37°F). Maximums can reach 18°C (65°F) and minimums can drop as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.

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 2°C (37°F), with highs reaching up to 18°C (65°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec313443526472767369584236
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 total precipitation amount is 102 mm (4.0 in) falling over the course of 10 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 102 mm (4.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7911111611112513511487919598102
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 87%. With an average temperature of 2°C (37°F), this humidity feels like an uncomfortable chill that seeps into your bones, making every step feel heavier and each breath a reminder of the dampness in the air, which can be quite challenging for traveling.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
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 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 Jamestown, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
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-1°C (31°F)79 mm (3.1 inches)88%moderate
February Weather1°C (35°F)111 mm (4.4 inches)88%moderate
March Weather6°C (43°F)116 mm (4.6 inches)87%high
April Weather11°C (52°F)111 mm (4.4 inches)85%very high
May Weather18°C (64°F)125 mm (4.9 inches)81%very high
June Weather22°C (72°F)135 mm (5.3 inches)82%very high
July Weather24°C (76°F)114 mm (4.5 inches)81%very high
August Weather23°C (74°F)87 mm (3.4 inches)73%very high
September Weather21°C (69°F)91 mm (3.6 inches)73%very high
October Weather14°C (58°F)95 mm (3.8 inches)78%high
November Weather6°C (42°F)98 mm (3.9 inches)89%moderate
December Weather2°C (37°F)102 mm (4.0 inches)87%moderate

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