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December Weather in Chatham, United States

Last updated: June 24, 2025

In December, the average temperature in Chatham, United States is a cool 11°C (53°F). While it can dip to a brisk -3°C (26°F), temperatures may also soar to a pleasant 28°C (83°F). Expect 128 mm (5.0 in) of precipitation spread across 9 days, accompanied by an average humidity of 88%. Stay prepared for a mix of weather!

December Temperature in Chatham

In December in Chatham, the average temperature is 11°C (53°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -3°C (26°F). This makes it essential for travelers to pack for a range of weather conditions, from warm days to chilly nights.

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

The chart illustrates December temperature patterns in Chatham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chatham, December typically has an average temperature of 11°C (53°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec495261657480838279685652
Data source: Temperature data for Chatham 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 Chatham

In Chatham in December, the precipitation amount is 128 mm (5.0 in) over a span of 9 days.

December Precipitation Trends in Chatham

The chart displays monthly precipitation patterns in Chatham, 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 Chatham, December typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec110180125160138122971269011581128
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Chatham

In Chatham in December humidity is 88%. With an average temperature of 11°C (53°F), this humidity feels like a heavy blanket wrapping around you, making travel feel sluggish and uncomfortable as you navigate the damp air.

December Average Humidity in Chatham

This chart illustrates the average monthly humidity levels in Chatham, 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 Chatham is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%78%79%81%77%72%65%63%70%82%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Chatham

In Chatham in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Chatham for better planning.

Maximum UV Index Levels in Chatham for December

The chart shows the monthly maximum UV Index (UVI) for Chatham 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 Chatham typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111112121110864
Data source: Chatham 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 Chatham Compares to Other Months

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

This table compares monthly weather conditions in Chatham, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)110 mm (4.3 inches)82%moderate
February Weather11°C (53°F)180 mm (7.1 inches)80%high
March Weather16°C (62°F)125 mm (4.9 inches)78%very high
April Weather18°C (65°F)160 mm (6.3 inches)79%extreme
May Weather24°C (75°F)138 mm (5.4 inches)81%extreme
June Weather27°C (80°F)122 mm (4.8 inches)77%extreme
July Weather28°C (83°F)97 mm (3.8 inches)72%extreme
August Weather28°C (83°F)125 mm (4.9 inches)65%extreme
September Weather26°C (79°F)90 mm (3.5 inches)63%very high
October Weather20°C (69°F)115 mm (4.5 inches)70%very high
November Weather13°C (56°F)81 mm (3.2 inches)82%high
December Weather11°C (53°F)128 mm (5.0 inches)88%moderate

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