December Weather in Falmouth, United States

Last updated: February 24, 2025

December in Falmouth, United States, showcases a climate that dances between cool and crisp, with temperatures ranging from a maximum of 16°C (61°F) to a minimum of -12°C (11°F). The average temperature settles at 4°C (40°F), creating a refreshing atmosphere perfect for winter activities. This month experiences considerable precipitation, totaling 129 mm (5.1 in) over approximately 11 days, contributing to the region's lush, wintery landscape. Coupled with an 80% humidity, December's weather in Falmouth is both invigorating and cozy, inviting residents and visitors alike to embrace the season’s charm.

December Temperature in Falmouth

December in Falmouth brings a notable chill as winter settles in, with temperatures showcasing a significant drop from the preceding months. The average temperature lingers around 4°C (40°F), while nighttime lows can plummet to a frigid -12°C (11°F). Despite these cold conditions, the daytime highs reach a relatively mild 16°C (61°F), hinting at occasional, albeit fleeting, warmth. As the year comes to a close, December marks a transition to winter’s embrace, characterized by a noticeable decrease in temperatures compared to the milder fall months, setting the stage for the chillier January ahead.

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.
JanFebMarAprMayJunJulAugSepOctNovDec353638465463717267604940
Data source: Temperature data for Falmouth 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 Falmouth

In December, Falmouth experiences a notable increase in precipitation, averaging 129 mm (5.1 in) over 11 days. This marks a shift from the preceding months, where rainfall hovered around lower averages, particularly during the summer when totals dipped below 90 mm. The winter season, characterized by its wetter conditions, sees December's rainfall slightly outpace November’s 103 mm, reflecting a trend of increasing precipitation as the year draws to a close. This seasonal surge in moisture plays a critical role in preparing the local ecosystem for the coming winter months, further enriching the terrain as it transitions to colder weather.

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.
JanFebMarAprMayJunJulAugSepOctNovDec93118116134119908486117168103129
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Falmouth

In December, Falmouth experiences a humidity level of 80%, reflecting a slight increase compared to the previous month. This is consistent with the general trend observed throughout the year, where humidity levels remain relatively high, particularly in the winter months. Starting at 84% in January and February, the humidity gradually descends to its lowest point in May at 75%, before creeping back up in November and December. This cyclical pattern suggests that while Falmouth maintains a pleasant coastal atmosphere, residents can expect a noticeable rise in moisture as the year closes out, enhancing the chilly winter ambiance.

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, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Falmouth

As winter settles in December, Falmouth, United States, experiences a decrease in UV exposure, with the UV Index dropping to 2, categorized as low. This notable decline signifies a trend of reduced sun intensity compared to the peak levels seen in the summer months, where the UV Index often soared to 9 or 10. With a burn time stretching to 45 minutes, residents can enjoy outdoor activities with a lower risk of sunburn. This trend highlights the annual oscillation in UV rays, reminding us of the importance of sun safety year-round. For more information, visit Falmouth UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998642
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.

December Sunshine in Falmouth

In Falmouth, December offers a cozy retreat from the bright summer months, wrapping up the year with 165 hours of sunshine. While this is a noticeable dip from the sun-drenched heights of July, which boasts a remarkable 346 hours, it still provides a comforting glow amid the crisp winter air. As the year progresses, there's a clear trend: sunshine hours ramp up from the depths of winter in January, which sees only 142 hours, peaking in mid-summer before gradually tapering off in the fall. December, while shorter in daylight, invites festive cheer and the warmth of community, reminding us that even in the season of shorter days, there’s a delightful charm in Falmouth’s winter sunshine.

Monthly Sunshine Duration in Falmouth: December Highlighted

The December sunshine duration represents the total number of hours Falmouth experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec142h184h258h243h298h326h346h330h280h236h203h165h
Data source: Falmouth December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Falmouth During December

While December in Falmouth, United States, typically wraps up the year with a lower chance of sunny weather at just 29%, it's interesting to note that this aligns with a gradual decline in sunshine probabilities from the fall months. In contrast to the 54% chance of sun in November, December marks a notable shift toward cloudier skies, continuing a trend seen from the more vibrant spring months, where 60% of days in March bask in sunlight. As temperatures drop and winter settles in, residents can expect a seasonally appropriate chill and a significant dip in sunny days, making these rare bright moments even more cherished.

Percentage of Sunny Days in December in Falmouth

The chart illustrates the percentage of sunny days in Falmouth throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Falmouth experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec41%31%60%46%41%38%41%36%50%45%54%29%
Data source: Falmouth December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Falmouth in December

In Falmouth, United States, the daylight duration exhibits a captivating ebb and flow throughout the year, with December reflecting the shorter days characteristic of winter. This month sees an average of 9 hours of daylight, mirroring the light availability found in both November and January. As the year progresses toward spring, daylight begins to gradually lengthen from March's 11 hours to a peak of 15 hours in June, before tapering off again as summer gives way to autumn. This seasonal rhythm underscores a natural cycle, where shorter days in winter make way for the vibrant, sun-filled days of summer, creating a dynamic interplay between light and life in this picturesque coastal town.

Average Daylight Hours in Falmouth for December

The chart illustrates the variation in daylight duration in Falmouth throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 32m10h 36m11h 58m13h 21m14h 32m15h 7m14h 48m13h 45m12h 25m11h 2m9h 49m9h 12m
Data source: Falmouth daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Falmouth

In Falmouth during the month of December, the average wind speed settles at 6.4 m/s (14 mph), marking a slight decline from the more robust winds of earlier months. This trend reflects a gradual easing from the stronger breezes experienced in the fall, with November and October both averaging 6.6 m/s (15 mph). As the year draws to a close, wind speeds often dip, suggesting a transition into calmer winter conditions. While the winds remain relatively moderate compared to the summer months, when they fell to their lowest—5.2 m/s in July—December still carries a noticeable chill that complements the festive atmosphere of the season. Whether it’s the rustling of leaves or the gentle push of ocean waves, the December winds in Falmouth gently whisper the arrival of winter.

Average December Wind Speed in Falmouth

The chart displays monthly wind speed patterns in Falmouth, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec6.86.76.86.56.16.15.24.95.96.66.66.4 m/s
Data source: Falmouth December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Falmouth Compares to Other Months

The weather in Falmouth changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Falmouth and find detailed weather information for every month.

In December, temperatures range from a minimum of -12°C (11°F) to a maximum of 16°C (61°F), with an average of 4°C (40°F). The month experiences significant precipitation, totaling 129 mm (5.1 in) over 11 days, along with a humidity level of 80%. In contrast, January sees cooler temperatures, with a minimum of -16°C (4°F) and a maximum of 13°C (55°F), averaging just 2°C (35°F). Precipitation decreases to 93 mm (3.7 in), occurring over 9 days, while humidity rises slightly to 84%. Overall, January typically feels colder and drier than December, though both months are characterized by their chilly conditions. For more detailed insights, you can check the Falmouth weather in January.

In December, temperatures range from a chilly minimum of -12°C (11°F) to a maximum of 16°C (61°F), with an average temperature of 4°C (40°F). The month experiences significant precipitation of 129 mm (5.1 in) over 11 days, accompanied by a humidity level of 80%. In contrast, February sees slightly cooler average temperatures, with a minimum of -12°C (11°F) and a maximum of 12°C (53°F), resulting in an average of 2°C (36°F). Precipitation in February is slightly less at 118 mm (4.6 in) over 12 days, while humidity increases to 84%. For more specific details on February conditions, you can check the following link: Falmouth weather in February.

December and March present distinct weather patterns, despite their proximity on the calendar. In December, temperatures range from a chilling minimum of -12°C (11°F) to a maximum of 16°C (61°F), with an average of 4°C (40°F). This month typically sees around 129 mm (5.1 in) of precipitation over 11 days, accompanied by a humidity level of 80%. In contrast, March offers slightly milder conditions, with temperatures ranging from a minimum of -9°C (17°F) to a maximum of 13°C (55°F), averaging 3°C (38°F). Precipitation decreases slightly to 116 mm (4.6 in) over 10 days, and humidity rises modestly to 82%. For more specific details on March weather patterns, visit Falmouth weather in March.

December weather features colder temperatures, with lows plummeting to -12°C (11°F) and an average of 4°C (40°F), while highs can reach up to 16°C (61°F). The month sees significant precipitation, totaling 129 mm (5.1 in) over approximately 11 days and a high humidity level of 80%. In contrast, April offers a milder climate, with minimum temperatures rising to 1°C (33°F) and an average temperature of 8°C (46°F), maintaining the same maximum of 16°C (61°F) as December. Precipitation slightly increases to 133 mm (5.3 in) across around 12 days, and humidity remains comparable at 79%. This transition from the chill of December to the relatively warmer, yet still damp, April hints at the changing seasons. For more detailed insights, visit Falmouth weather in April.

In December, temperatures can drop as low as -12°C (11°F), with an average of 4°C (40°F) and highs reaching 16°C (61°F). The month typically sees significant precipitation, totaling 129 mm (5.1 in) over about 11 days, along with a high humidity level of 80%. In contrast, May presents a much milder climate, where temperatures range from a minimum of 4°C (40°F) to an average of 12°C (54°F), peaking at 20°C (67°F). Although May also experiences precipitation, it totals 119 mm (4.7 in) over approximately 13 days and comes with slightly lower humidity at 75%. For more detailed information on what to expect, check out Falmouth weather in May.

December and June present a stark contrast in weather conditions. In December, temperatures can plummet as low as -12°C (11°F) and only reach a maximum of 16°C (61°F), with an average of around 4°C (40°F). The month experiences significant precipitation, totaling 129 mm (5.1 in) over 11 days, coupled with high humidity at 80%. In contrast, June enjoys much milder temperatures, ranging from a minimum of 11°C (52°F) to a maximum of 23°C (74°F), with an average of 17°C (63°F). Precipitation is also lower during June, totalizing 90 mm (3.5 in) across 10 days, while humidity levels are slightly reduced at 78%. For more detailed weather insights, check out the Falmouth weather in June.

December and July present stark contrasts in weather conditions. In December, temperatures can drop as low as -12°C (11°F), with an average of 4°C (40°F) and a maximum of 16°C (61°F). The month is characterized by higher precipitation levels, totaling 129 mm (5.1 in) over 11 days, coupled with a humidity level of 80%. In contrast, July offers much milder temperatures, with minimums around 16°C (61°F), an average of 22°C (71°F), and highs reaching 27°C (81°F). Precipitation in July is lower, at 84 mm (3.3 in) over just 9 days, with humidity slightly reducing to 76%. For a more detailed look at July's weather, you can check out Falmouth weather in July.

The weather in December and August presents a stark contrast, reflecting the seasonal shift from winter to summer. In December, temperatures can plunge to a minimum of -12°C (11°F), with an average of around 4°C (40°F) and a maximum reaching 16°C (61°F). This month also sees significant precipitation, averaging 129 mm (5.1 in) over about 11 days, coupled with high humidity at 80%. Conversely, August offers a much warmer climate with minimum temperatures of 17°C (63°F), an average of 22°C (73°F), and a maximum of 26°C (80°F). Precipitation in August is lower at 86 mm (3.4 in) and occurs over just 9 days, with a slightly lower humidity level of 76%. For more detailed information, you can check Falmouth weather in August.

When comparing the weather in December and September, notable differences are evident. In December, temperatures range from a minimum of -12°C (11°F) to a maximum of 16°C (61°F), with an average of 4°C (40°F). In contrast, September enjoys milder temperatures, with a minimum of 14°C (57°F) and a maximum of 25°C (78°F), averaging around 20°C (67°F). Precipitation levels are similar, with December receiving 129 mm (5.1 in) over 11 days and September slightly less at 117 mm (4.6 in) over 10 days. Humidity is also higher in December at 80%, compared to 75% in September. For more detailed weather information for September, you can visit Falmouth weather in September.

December and October exhibit noticeable differences in weather patterns. In December, temperatures range dramatically with a minimum of -12°C (11°F) and an average of 4°C (40°F), while October boasts milder conditions, with a minimum of 4°C (39°F) and an average of 15°C (60°F). Precipitation is slightly lower in December, totaling 129 mm (5.1 in) over 11 days, compared to October's 168 mm (6.6 in) over 12 days. Additionally, December is more humid, with a humidity level of 80% compared to October’s 75%. For a closer look at October weather, you can visit Falmouth weather in October.

Comparing the weather between November and December reveals notable differences. December experiences colder temperatures, with a minimum reaching -12°C (11°F) compared to November's milder minimum of -6°C (21°F). While both months have similar humidity levels at 80%, December sees increased precipitation, totaling 129 mm (5.1 in) over 11 days, in contrast to November’s 103 mm (4.0 in) over 10 days. Additionally, the average temperature in December is slightly lower at 4°C (40°F), compared to November's average of 9°C (49°F). For more insights on November weather in Falmouth, check out Falmouth weather in November.

Compare Falmouth's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Falmouth

As December settles in Falmouth, it ushers in a notable shift in weather patterns, distinct from the milder months preceding it. The chill creeps in, with temperatures dropping significantly, creating a stark contrast to the remaining fall days. While the average temperature hovers around a cool 4°C, the possibility of frost looms as minimums dip to -12°C. Precipitation becomes more frequent, with rain gracing the town on over a third of the days, leading to a damp and humid atmosphere at about 80%. This month stands out not only for its chill but also as a harbinger of the winter months ahead. For more insights and detailed climate patterns, explore Falmouth Climate.