nomadseason

December Weather in Chelsea, United States

Last updated: June 24, 2025

In December, the average temperature in Chelsea, United States hovers around 7°C (44°F). Visitors should be prepared for a wide temperature range, with minimums dipping to -9°C (15°F) and occasional maximums reaching 24°C (76°F). Expect about 50 mm (2.0 in) of precipitation over approximately 6 days, accompanied by a notable average humidity of 85%.

December Temperature in Chelsea

In December in Chelsea, the average temperature is 7°C (44°F). Maximum temperatures can reach 24°C (76°F), while the minimum can drop as low as -9°C (15°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates December temperature patterns in Chelsea, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chelsea, December typically has an average temperature of 7°C (44°F), with highs reaching up to 24°C (76°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec384053596979828076625044
Data source: Temperature data for Chelsea generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Chelsea

In Chelsea in December, the precipitation amount is 50 mm (2.0 in) over the course of 6 days.

December Precipitation Trends in Chelsea

The chart displays monthly precipitation patterns in Chelsea, 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 Chelsea, December typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec766812213920410397113911395350
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Chelsea

In Chelsea in December, humidity is 85%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable.

December Average Humidity in Chelsea

This chart illustrates the average monthly humidity levels in Chelsea, 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 Chelsea is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%71%74%83%83%81%73%67%72%82%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Chelsea

In Chelsea 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 Chelsea, you can check the information here.

Maximum UV Index Levels in Chelsea for December

The chart shows the monthly maximum UV Index (UVI) for Chelsea 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 Chelsea typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Chelsea 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 Chelsea Compares to Other Months

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

This table compares monthly weather conditions in Chelsea, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)76 mm (3.0 inches)77%moderate
February Weather5°C (41°F)68 mm (2.7 inches)76%high
March Weather12°C (53°F)122 mm (4.8 inches)71%high
April Weather15°C (59°F)139 mm (5.5 inches)73%very high
May Weather21°C (69°F)204 mm (8.0 inches)83%very high
June Weather26°C (79°F)103 mm (4.1 inches)83%extreme
July Weather28°C (82°F)97 mm (3.8 inches)81%extreme
August Weather27°C (80°F)113 mm (4.4 inches)73%very high
September Weather24°C (76°F)91 mm (3.6 inches)67%very high
October Weather16°C (62°F)139 mm (5.5 inches)72%high
November Weather10°C (50°F)53 mm (2.1 inches)82%moderate
December Weather7°C (44°F)50 mm (2.0 inches)85%moderate

Compare Chelsea's Climate with Cities Worldwide