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December Weather in Falmouth, United States

Last updated: June 24, 2025

During December in Falmouth, United States, the average temperature hovers around 6°C (43°F), with a minimum of -10°C (14°F) and a maximum reaching 21°C (71°F). Expect 88 mm (3.5 in) of precipitation spread across 9 days, contributing to a rather high average humidity of 85%. Prepare for a month that comfortably balances chilly days with occasional warmth!

December Temperature in Falmouth

In December in Falmouth, the average temperature is 6°C (43°F). Maximum temperatures can reach 21°C (71°F), while minimums can drop as low as -10°C (14°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates December temperature patterns in Falmouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Falmouth, December typically has an average temperature of 6°C (43°F), with highs reaching up to 21°C (71°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec394348586876817873634943
Data source: Temperature data for Falmouth 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 Falmouth

In Falmouth in December, the precipitation amount is 88 mm (3.5 in) over the course of 9 days.

December Precipitation Trends in Falmouth

The chart displays monthly precipitation patterns in Falmouth, 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 Falmouth, December typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec62907610110910991148911097788
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Falmouth

In Falmouth in December, humidity is 85%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making travel feel more uncomfortable and limiting your enjoyment of the sights as you navigate the wet, brisk air.

December Average Humidity in Falmouth

This chart illustrates the average monthly humidity levels in Falmouth, 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 Falmouth is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Falmouth

In Falmouth 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 Falmouth, you can check the information here.

Maximum UV Index Levels in Falmouth for December

The chart shows the monthly maximum UV Index (UVI) for Falmouth 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 Falmouth typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Falmouth 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 Falmouth Compares to Other Months

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

This table compares monthly weather conditions in Falmouth, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)62 mm (2.4 inches)86%moderate
February Weather6°C (43°F)90 mm (3.6 inches)86%moderate
March Weather9°C (49°F)76 mm (3.0 inches)86%high
April Weather15°C (59°F)101 mm (4.0 inches)84%very high
May Weather20°C (68°F)109 mm (4.3 inches)78%very high
June Weather24°C (76°F)109 mm (4.3 inches)79%very high
July Weather27°C (81°F)91 mm (3.6 inches)70%very high
August Weather26°C (78°F)148 mm (5.8 inches)59%very high
September Weather23°C (73°F)91 mm (3.6 inches)68%very high
October Weather17°C (63°F)109 mm (4.3 inches)80%high
November Weather9°C (49°F)77 mm (3.0 inches)86%moderate
December Weather6°C (43°F)88 mm (3.5 inches)85%moderate

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