nomadseason

December Weather in Cohasset, United States

Last updated: June 24, 2025

In December, the average temperature in Cohasset, United States hovers around 3°C (38°F). Expect a chilly range with minimums dropping to -15°C (6°F) and maximums reaching up to 15°C (59°F). During this month, you can anticipate 147 mm (5.8 in) of precipitation spread over approximately 11 days, contributing to an average humidity level of 81%.

December Temperature in Cohasset

In December in Cohasset, the average temperature is 3°C (38°F), with maximums reaching up to 15°C (59°F) and minimums dipping as low as -15°C (6°F). Travelers should be prepared for a chilly climate, layering clothing to stay comfortable during the day and warm at night.

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

The chart illustrates December temperature patterns in Cohasset, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cohasset, December typically has an average temperature of 3°C (38°F), with highs reaching up to 15°C (59°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec343537455363707065574638
Data source: Temperature data for Cohasset 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 Cohasset

In Cohasset in December, the total precipitation amount is 147 mm (5.8 in), occurring over the course of 11 days.

December Precipitation Trends in Cohasset

The chart displays monthly precipitation patterns in Cohasset, 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 Cohasset, December typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec971221181591109410467107182115147
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Cohasset

In Cohasset in December, humidity is 81%. With an average temperature of 3°C (38°F), this humidity feels like a heavy blanket wrapped around you, making outdoor activities uncomfortable and travel challenging due to the cold, damp air.

December Average Humidity in Cohasset

This chart illustrates the average monthly humidity levels in Cohasset, 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 Cohasset is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Cohasset

In Cohasset 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 Cohasset, you can visit Hourly UV Index in Cohasset.

Maximum UV Index Levels in Cohasset for December

The chart shows the monthly maximum UV Index (UVI) for Cohasset 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 Cohasset typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997642
Data source: Cohasset 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 Cohasset Compares to Other Months

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

This table compares monthly weather conditions in Cohasset, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)97 mm (3.8 inches)86%low
February Weather2°C (35°F)122 mm (4.8 inches)84%moderate
March Weather3°C (38°F)118 mm (4.7 inches)82%moderate
April Weather7°C (45°F)159 mm (6.3 inches)80%very high
May Weather12°C (54°F)110 mm (4.3 inches)72%very high
June Weather17°C (63°F)94 mm (3.7 inches)72%very high
July Weather21°C (70°F)104 mm (4.1 inches)67%very high
August Weather21°C (71°F)66 mm (2.6 inches)66%very high
September Weather19°C (66°F)107 mm (4.2 inches)71%high
October Weather14°C (58°F)182 mm (7.2 inches)78%high
November Weather8°C (46°F)115 mm (4.5 inches)84%moderate
December Weather3°C (38°F)147 mm (5.8 inches)81%low

Compare Cohasset's Climate with Cities Worldwide