December Weather in Nantucket, United States

Last updated: February 24, 2025

December in Nantucket showcases a brisk winter climate, where temperatures typically range from a mild maximum of 16°C (61°F) to a chilly minimum of -9°C (16°F), settling around an average of 5°C (42°F). The month experiences considerable precipitation, with 132 mm (5.2 in) spread over 12 days, contributing to the landscape's winter charm. With a high humidity level of 80%, the atmosphere can feel quite crisp, making it the perfect backdrop for cozy indoor gatherings and holiday festivities. Whether you're braving the chill outdoors or enjoying the warmth inside, Nantucket's December weather encapsulates the essence of winter on this picturesque island.

December Temperature in Nantucket

As December settles in Nantucket, the island experiences the first hints of winter's chill, with temperatures dipping to a minimum of -9°C (16°F) and averaging around 5°C (42°F). This month marks a transition from the milder late fall weather, as the maximum temperatures reach only 16°C (61°F). Compared to the slightly warmer November, where temperatures hover between -5°C (24°F) and 19°C (66°F), December showcases a noticeable drop, hinting at the cold months ahead. Overall, while the air becomes crisp, the scenic beauty of Nantucket persists, inviting visitors to enjoy the serene winter landscape.

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

The chart illustrates December temperature patterns in Nantucket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec373739455160676966595042
Data source: Temperature data for Nantucket 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 Nantucket

In December, Nantucket experiences a moderate level of precipitation, with 132 mm (5.2 in) falling over approximately 12 days. This marks an increase from the preceding month's 115 mm, suggesting a trend towards wetter conditions as winter sets in. December's rainfall is among the higher amounts seen throughout the year, with only October surpassing it significantly. The steady precipitation in the final month of the year embraces the island in a chilly embrace, contributing to the festive winter atmosphere. Notably, the consistency in rainy days reflects the seasonal shift, as Nantucket prepares for the colder months ahead.

December Precipitation Trends in Nantucket

The chart displays monthly precipitation patterns in Nantucket, 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.
JanFebMarAprMayJunJulAugSepOctNovDec96127114127130836498122162115132
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Nantucket

As the year comes to a close, December in Nantucket sees an increase in humidity, measuring around 80%. This marks a slight uptick from November's 80%, maintaining a consistent level throughout the late fall and early winter months. Overall, humidity levels in Nantucket exhibit a gradual decline from a high of 84% in the chilly heart of winter (January and February) to a more comfortable 75% by mid-autumn. The transition from spring to summer showcases the most significant drop, with levels falling from 79% in April to 76% in July and August. This cyclical pattern indicates that while Nantucket experiences a humid climate year-round, the cooler months retain a slightly elevated moisture level, creating a unique coastal atmosphere.

December Average Humidity in Nantucket

This chart illustrates the average monthly humidity levels in Nantucket, 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 Nantucket

In December, Nantucket experiences a noticeable shift in its UV Index, dropping to a low level of 2, indicating a decrease in potential sun exposure. As the winter months set in, residents and visitors enjoy longer burn times of 45 minutes with a reduced need for sun protection compared to the peak summer months, where the UV Index soared to 10. This trend highlights the seasonal fluctuation of UV radiation; from the very high levels in the summer when caution is crucial, to the moderate and low indices in the fall and winter. It's a reminder to enjoy the coastal beauty comfortably while still being mindful of the sun's rays. For a detailed year-round overview, check out Nantucket UV Index.

Maximum UV Index Levels in Nantucket for December

The chart shows the monthly maximum UV Index (UVI) for Nantucket 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.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Nantucket 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 Nantucket

In December, Nantucket experiences 156 hours of sunshine, marking a subtle dip as the island transitions into the heart of winter. This month follows a dynamic year of fluctuating sunlight, with a notable peak in summer342 hours in July—highlighting the vibrant, sun-kissed months. As the year winds down, December's sunlight is less than half of its peak, yet still brighter than the frigid January lows of 134 hours. This trend reveals a gradual reduction in daylight as the seasons shift, while also hinting at the charming allure of Nantucket's winter, where even limited sunshine conjures a unique beauty against the backdrop of its serene landscapes.

Monthly Sunshine Duration in Nantucket: December Highlighted

The December sunshine duration represents the total number of hours Nantucket 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.
JanFebMarAprMayJunJulAugSepOctNovDec134h174h256h244h299h319h342h327h278h238h200h156h
Data source: Nantucket December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Nantucket During December

In Nantucket, the prospects for sunny weather in December tend to be rather dim, with only 27% likelihood of sunshine. This trend reflects a notable drop from the more favorable percentages seen in the preceding months, particularly with November peaking at 51%. As winter approaches, the chances of basking in sunlight significantly decrease, creating a stark contrast to the early spring months, which boast a much brighter 56% likelihood in March. Overall, December’s overcast skies signal the onset of winter, urging locals and visitors alike to embrace the cozy atmosphere rather than rely on the fleeting sun.

Percentage of Sunny Days in December in Nantucket

The chart illustrates the percentage of sunny days in Nantucket 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 Nantucket experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec36%27%56%47%43%37%42%39%55%46%51%27%
Data source: Nantucket December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Nantucket in December

In Nantucket, December marks the return to shorter days, echoing the pattern established in November with just 9 hours of daylight. As winter settles in, the daylight duration holds steady, reminiscent of the early winter months, reflecting a gradual decline since June's peak of 15 hours. This seasonal trend illustrates the stark contrast between the long, sunlit days of summer, where daylight reaches its zenith, and the brevity of winter days, fostering a cozy atmosphere perfect for holiday festivities. As the year draws to a close, Nantucket's daylight serves as a reminder of the cyclic nature of time, inviting residents and visitors alike to embrace the longer nights and the joys they bring.

Average Daylight Hours in Nantucket for December

The chart illustrates the variation in daylight duration in Nantucket throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 34m10h 37m11h 58m13h 20m14h 30m15h 5m14h 46m13h 44m12h 24m11h 2m9h 50m9h 14m
Data source: Nantucket daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Nantucket

As December settles over Nantucket, the island witnesses an average wind speed of 7.6 m/s (17 mph), marking a subtle decline from the brisker gusts of the earlier months. This shift reflects a seasonal trend, where the winds gradually taper off from the year’s highs, peaking in January at 8.2 m/s (18 mph) and smoothly declining through spring and summer. By the time winter arrives, Nantucket's winds have softened, yet they still maintain a lively presence, reminiscent of the vibrant maritime spirit that defines this charming destination. The consistent drop from summer’s calm winds, registering as low as 5.2 m/s (12 mph) in August, underscores the interplay between the seasons, inviting visitors to embrace the unique charm of a wintery Nantucket while feeling the gentle yet persistent breezes that linger in the air.

Average December Wind Speed in Nantucket

The chart displays monthly wind speed patterns in Nantucket, 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.
JanFebMarAprMayJunJulAugSepOctNovDec8.28.07.97.56.66.55.45.26.47.37.77.6 m/s
Data source: Nantucket December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Nantucket Compares to Other Months

The weather in Nantucket 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 Nantucket and find detailed weather information for every month.

In December, temperatures typically range from a minimum of -9°C (16°F) to a maximum of 16°C (61°F), with an average temperature of 5°C (42°F). This month also experiences notable precipitation, with 132 mm (5.2 in) falling over 12 days and humidity averaging around 80%. In contrast, January sees slightly colder conditions, with temperatures dipping to a minimum of -13°C (9°F) and a maximum of 13°C (55°F), resulting in an average temperature of 3°C (38°F). Precipitation decreases to 96 mm (3.8 in) over 10 days, while humidity rises slightly to 84%. For more specifics on January weather, you can visit Nantucket weather in January.

In December, temperatures in Nantucket typically range from a minimum of -9°C (16°F) to a maximum of 16°C (61°F), with an average of 5°C (42°F). The month sees around 132 mm (5.2 in) of precipitation over about 12 days, and humidity levels hover around 80%. In contrast, February's climate is slightly cooler, with temperatures dipping to a minimum of -10°C (15°F) and peaking at 13°C (55°F), resulting in an average temperature of 3°C (38°F). Precipitation in February is slightly lower at 127 mm (5.0 in), spread across 13 days, and humidity rises to 84%. For more detailed information, you can check Nantucket weather in February.

December and March feature similar weather patterns, with both months experiencing chilly temperatures and notable precipitation. December typically has a lower average temperature, ranging from a minimum of -9°C (16°F) to a maximum of 16°C (61°F), while March shows slightly milder conditions, with temperatures ranging from -7°C (19°F) to a maximum of 12°C (53°F). Precipitation is marginally higher in December at 132 mm (5.2 in) over 12 days, compared to March's 114 mm (4.5 in) over 11 days. Humidity levels are comparable as well, with December at 80% and March slightly higher at 82%. For more detailed insights, you can check Nantucket weather in March.

December and April exhibit notable differences in weather patterns. In December, temperatures can range from a chilling minimum of -9°C (16°F) to a maximum of 16°C (61°F), with an average of 5°C (42°F). The month is also marked by significant precipitation, totaling 132 mm (5.2 in) over about 12 days, alongside a relatively high humidity level of 80%. In contrast, April brings milder conditions, with temperatures starting at a minimum of 1°C (34°F) and peaking at 13°C (56°F), averaging around 7°C (45°F). Precipitation in April is slightly less, at 127 mm (5.0 in), also occurring over approximately 12 days, and humidity levels are comparable at 79%. For a closer look at April weather specifics, you can view more details here: Nantucket weather in April.

When comparing the weather in December and May, it's evident that both months experience similar maximum temperatures, with December peaking at around 16°C (61°F) and May reaching 16°C (62°F). However, December features much colder minimum temperatures, dropping to -9°C (16°F), while May starts at a milder minimum of 5°C (41°F). Precipitation levels are comparable, with December seeing 132 mm (5.2 in) and May slightly lower at 130 mm (5.1 in), and both months average around 12 days of precipitation. Additionally, the humidity in December is higher at 80%, compared to 75% in May, creating a noticeably different atmosphere between the two months. For more detailed insights, check out Nantucket weather in May.

When comparing the weather in December and June, it's clear that these months offer vastly different experiences. December temperatures can plunge to a minimum of -9°C (16°F) and reach an average of 5°C (42°F), while June typically ranges from a minimum of 10°C (50°F) to an average of 15°C (60°F), peaking at 21°C (70°F). Additionally, December has a higher precipitation total of 132 mm (5.2 in) over 12 days, compared to June's 83 mm (3.2 in) over 10 days, indicating a wetter and colder winter month. Humidity levels are also comparable, with December at 80% and June slightly lower at 78%. For a closer look at June's climate, you can visit Nantucket weather in June.

December and July offer stark contrasts in weather, reflecting the extremes of winter and summer. December typically sees temperatures ranging from a chilly -9°C (16°F) to a milder 16°C (61°F), with an average of 5°C (42°F). It also experiences significant precipitation, averaging 132 mm (5.2 in) over about 12 days, accompanied by high humidity at 80%. In contrast, July brings warmer temperatures, ranging from a minimum of 15°C (59°F) to a comfortable maximum of 24°C (76°F), with an average of 20°C (67°F). Precipitation is lighter, averaging just 64 mm (2.5 in) over 8 days, and humidity is slightly lower at 76%. These differences highlight how December's cold and damp conditions contrast sharply with July's warm and relatively dry climate. For more details, visit Nantucket weather in July.

December and August exhibit stark contrasts in weather patterns. In December, temperatures can plunge as low as -9°C (16°F) with an average of 5°C (42°F) and peak at 16°C (61°F). This month also experiences higher precipitation levels, totaling 132 mm (5.2 in) over 12 days, coupled with a humidity of 80%. In contrast, August is much milder, featuring minimum temperatures of 16°C (62°F), an average of 21°C (70°F), and a maximum of 24°C (76°F). August typically sees less precipitation, with 98 mm (3.9 in) across just 8 days and lower humidity at 76%. For more detailed information, check out Nantucket weather in August.

December and September present contrasting weather patterns in Nantucket. In December, temperatures can drop as low as -9°C (16°F) with an average of 5°C (42°F) and can reach a maximum of 16°C (61°F). This month also sees more precipitation, totaling 132 mm (5.2 in) over about 12 days, paired with a higher humidity level of 80%. In contrast, September enjoys milder temperatures, ranging from a minimum of 13°C (56°F) to a maximum of 23°C (73°F), with an average of 19°C (66°F). Precipitation is slightly less at 122 mm (4.8 in) over 10 days, and humidity is a bit lower at 75%. For more detailed insights about the weather during this month, visit Nantucket weather in September.

December and October exhibit stark differences in weather patterns. In December, temperatures range from a chilly -9°C (16°F) at night to a milder 16°C (61°F) during the day, with an average temperature of around 5°C (42°F). In contrast, October tends to be warmer, with minimum temperatures of 5°C (41°F), an average of 15°C (60°F), and maximums reaching 22°C (71°F).

Precipitation levels are also notable; December sees 132 mm (5.2 in) of rain over 12 days, while October has slightly higher precipitation at 162 mm (6.4 in) over the same number of days. Humidity is higher in December at 80%, compared to 75% in October, which adds to the chilly feel of the winter month. For more details on October weather, check out Nantucket weather in October.

When comparing the weather in December to that of November, it's evident that December tends to be colder overall. In December, average temperatures range from a minimum of -9°C (16°F) to a maximum of 16°C (61°F), while November sees milder conditions with a minimum of -5°C (24°F) and a maximum of 19°C (66°F). Additionally, precipitation levels are slightly higher in December, with 132 mm (5.2 in) over 12 days compared to November’s 115 mm (4.5 in) over 10 days. Both months share similar humidity levels at 80%, but the chill factor in December can make the weather feel more biting. For those interested in more about November weather, you can refer to this link: Nantucket weather in November.

Compare Nantucket's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Nantucket

December on Nantucket brings a distinct chill compared to the milder months, as temperatures hover around a crisp average of 5°C (42°F), with the potential for colder spells that can dip as low as -9°C (16°F). Precipitation is notable during this month, with 132 mm (5.2 in) of rain falling over 12 days, contributing to a humidity level of around 80% that can make the air feel even colder. This combination of wet and cool conditions sets December apart from the typically warmer and drier months, creating a unique winter atmosphere perfect for cozy retreats. For more insights into Nantucket's weather patterns, visit Nantucket Climate.