December Weather in Deer Isle, United States

Last updated: February 24, 2025

In Deer Isle, United States, December brings a chill that envelops the landscape, with maximum temperatures reaching 13°C (56°F) and averaging around 1°C (34°F). The month showcases its coldest points, dipping to a brisk -17°C (2°F). Amidst this frosty backdrop, the area experiences notable precipitation, accumulating 155 mm (6.1 in) over 12 days, contributing to a humid atmosphere with an average humidity of 84%. The combination of temperature extremes and consistent moisture paints a vivid picture of a wintery December, making it a month of both beauty and briskness in Deer Isle.

December Temperature in Deer Isle

In Deer Isle, United States, December marks a significant shift towards the chill of winter, with temperatures ranging from a minimum of -17°C (2°F) to a maximum of 13°C (56°F). The average temperature settles around 1°C (34°F), highlighting a month where the warmth of autumn gives way to frosty days. Reflecting an overall trend, December's sub-zero nights are reminiscent of January's coldest extremes, yet the daytime offers brief respites that hint at the coming thaw of spring. As the year draws to a close, the crisp air encourages cozy gatherings and outdoor adventures, inviting residents and visitors alike to embrace the serene beauty of a winter landscape.

December Weather in Deer Isle: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Deer Isle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec292933414856616460544334
Data source: Temperature data for Deer Isle 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 Deer Isle

In December, Deer Isle experiences a notable spike in precipitation, averaging 155 mm (6.1 inches), making it one of the wetter months of the year. Unlike the previous months, which see a gradual decrease in rainfall during the summer, December reintroduces a higher volume of rain, accompanied by 12 days of precipitation. This uptick can be linked to the shift in seasons, as colder temperatures often bring about increased moisture. The rainfall in December is especially significant when compared to the drier summer months, underscoring a clear trend towards wetter conditions as the year draws to a close. This seasonal pattern not only refreshes the landscape but also prepares Deer Isle for the upcoming winter months, blending the beauty of the island’s natural scenery with the need for seasonal adjustments.

December Precipitation Trends in Deer Isle

The chart displays monthly precipitation patterns in Deer Isle, 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.
JanFebMarAprMayJunJulAugSepOctNovDec10810584157105879286102145138155
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Deer Isle

In December, Deer Isle experiences a slight dip in humidity, boasting a level of 84%. This month continues the trend of relatively high humidity that characterizes the winter months, with levels consistently hovering around the mid-80s from January through November. As we transition from autumn, humidity shows a gradual decrease from November's 85%, yet stays comfortably high compared to the drier spring and summer months. Notably, the humidity remains higher in the winter, reflecting a pattern that suggests Deer Isle enjoys a moist maritime climate, offering a consistent backdrop of cozy, damp air as the year comes to an end.

December Average Humidity in Deer Isle

This chart illustrates the average monthly humidity levels in Deer Isle, 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.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%85%81%76%74%74%74%77%82%85%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Deer Isle

As December rolls in, Deer Isle experiences a notable drop in UV exposure, with the UV Index settling at 2, categorized as low. This is a stark contrast to the preceding summer months, where values peaked at 9 in June, July, and May, indicating a shift from very high to low sun-related risks. The burn time extends to 45 minutes this month, allowing for longer periods outdoors without the immediate concern of sunburn. Compared to the earlier winter months, December reflects a consistent pattern of decreased UV radiation, providing a respite during the colder season. For more on UV levels throughout the year, check out Deer Isle UV Index.

Maximum UV Index Levels in Deer Isle for December

The chart shows the monthly maximum UV Index (UVI) for Deer Isle 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.
JanFebMarAprMayJunJulAugSepOctNovDec245799987532
Data source: Deer Isle 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 Deer Isle

In Deer Isle, United States, December brings a modest 170 hours of sunshine, a slight dip as the year winds down. The trend reflects a gradual decline from the summer months, where residents basked in an impressive 325 hours of sunshine in August. As the seasons change, there’s a notable shift from the vibrant 286 hours in May to a more restrained winter glow. Despite this decrease, December still offers a cozy charm, inviting both locals and visitors to enjoy the tranquil beauty of the landscape under soft winter light. This enchanting interplay of sunlight throughout the year highlights Deer Isle's unique character, setting the stage for a serene yet vibrant end to the year.

Monthly Sunshine Duration in Deer Isle: December Highlighted

The December sunshine duration represents the total number of hours Deer Isle 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.
JanFebMarAprMayJunJulAugSepOctNovDec143h187h255h238h286h317h316h325h278h216h180h170h
Data source: Deer Isle December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Deer Isle During December

In Deer Isle, United States, December brings a modest chance of sunny weather, standing at 35%, which aligns with the trend of lower sunshine probabilities typical for the winter months. As the year winds down, the likelihood of clear skies is notably less than in March and November, where the chances rise significantly to 55%. Interestingly, the peak sunny months occur in spring and early fall, with a noticeable dip in summer, particularly in July and August. Despite December's cooler climate, residents and visitors can still hold out hope for some bright days among the winter clouds.

Percentage of Sunny Days in December in Deer Isle

The chart illustrates the percentage of sunny days in Deer Isle 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 Deer Isle experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec38%35%55%35%35%38%26%29%42%43%55%35%
Data source: Deer Isle December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Deer Isle in December

In Deer Isle, United States, December marks the transition into the shortest days of the year, with daylight lasting just 8 hours. As the year unfolds, a clear rhythm emerges: from January to March, the gradual increase in daylight offers a welcome lift, moving from 9 hours to 11 hours. This trend continues into the spring and summer months, peaking at an impressive 15 hours in both June and July, allowing residents and visitors to fully embrace the warm, sun-filled days. However, as autumn approaches, daylight begins to wane, swiftly declining back to 9 hours by November, only to dip further as December sets in. This cyclical pattern highlights the stark contrast between the bright summer months and the quiet, reflective days of winter, capturing the seasonal essence of life in Deer Isle.

Average Daylight Hours in Deer Isle for December

The chart illustrates the variation in daylight duration in Deer Isle throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 17m10h 28m11h 57m13h 29m14h 46m15h 25m15h 4m13h 55m12h 27m10h 56m9h 36m8h 54m
Data source: Deer Isle daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Deer Isle

As December sweeps into Deer Isle, the winds begin to pick up again, bringing an average speed of 7.4 m/s (17 mph). This slight increase from November's 6.9 m/s (15 mph) marks a notable trend as the year closes out; the wind tends to strengthen during the winter months. From the gentle breezes of late summer and early fall, where wind speeds dipped below 5 m/s, December signals a transition back to brisk conditions. The month mirrors the early winter months of January and March, which also boast similar speeds, emphasizing the seasonal rhythm of winds in this coastal haven. As nature shifts gears, residents can expect the invigorating gusts that make December a truly dynamic time on Deer Isle.

Average December Wind Speed in Deer Isle

The chart displays monthly wind speed patterns in Deer Isle, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7.36.97.76.35.55.74.64.25.45.96.97.4 m/s
Data source: Deer Isle December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Deer Isle Compares to Other Months

The weather in Deer Isle 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 Deer Isle and find detailed weather information for every month.

In comparing the weather between December and January, December tends to be slightly milder, with average temperatures around 1°C (34°F), while January experiences a notable drop, averaging -2°C (29°F). Both months share the same minimum temperature of -17°C (2°F), but January peaks at a lower maximum of 10°C (50°F) compared to December's 13°C (56°F). Precipitation is also less frequent in January, occurring over 9 days with a total of 108 mm (4.3 in), compared to December’s 155 mm (6.1 in) over 12 days. Additionally, humidity remains quite high in both months, with January showing a slight increase to 88% from December's 84%. For more detailed weather information, you can refer to Deer Isle weather in January.

December and February both experience cold temperatures, but February tends to be slightly warmer overall. In December, the average temperature hovers around 1°C (34°F), with a minimum of -17°C (2°F) and a maximum of 13°C (56°F). In contrast, February's average temperature drops to -1°C (30°F), with a minimum of -15°C (6°F) and a maximum of 9°C (49°F). While December sees higher precipitation levels at 155 mm (6.1 in) over 12 days, February has a slightly lower precipitation of 105 mm (4.1 in) over 11 days. Humidity remains high in both months, with December at 84% and February slightly higher at 88%. For more detailed weather patterns, you can check Deer Isle weather in February.

December and March exhibit notable differences in weather patterns, though both months remain cold. In December, temperatures range from a minimum of -17°C (2°F) to a maximum of 13°C (56°F), with an average temperature of around 1°C (34°F). The month is characterized by high precipitation levels, totaling 155 mm (6.1 in) over 12 days and maintaining a humidity of 84%. In contrast, March shows a slightly milder temperature range, with minimums of -15°C (6°F) and maximums of 10°C (50°F), while the average temperature rests at 0°C (33°F). Precipitation in March is reduced to 84 mm (3.3 in) across 9 days, and humidity remains fairly consistent at 85%. For more detailed weather insights, you can check Deer Isle weather in March.

December and April exhibit notable differences in weather patterns. In December, temperatures can plummet to a minimum of -17°C (2°F), with an average around 1°C (34°F) and a maximum of 13°C (56°F). The month is characterized by high humidity levels at 84% and significant precipitation, totaling 155 mm (6.1 in) over approximately 12 days. In contrast, April sees milder temperatures, with a minimum of -3°C (27°F), averaging 5°C (41°F), and peaking at 14°C (57°F). Although precipitation is slightly higher at 157 mm (6.2 in), it occurs over 13 days, and humidity decreases slightly to 81%. For a closer look at what to expect during this transitional month, check out Deer Isle weather in April.

December and May present stark contrasts in weather conditions. December experiences chilly temperatures, with a minimum of -17°C (2°F) and an average of 1°C (34°F), peaking at 13°C (56°F). The month is also marked by significant precipitation, accumulating to 155 mm (6.1 in) over 12 days, accompanied by high humidity levels averaging 84%. In contrast, May sees a much milder climate, with temperatures ranging from a minimum of 2°C (37°F) to a comfortable maximum of 17°C (64°F) and an average of 9°C (49°F). While still rainy, May's precipitation totals 105 mm (4.1 in) over 11 days, with humidity slightly lower at 76%. For a closer look at May weather patterns, visit Deer Isle weather in May.

In December, the weather is significantly colder with temperatures ranging from a minimum of -17°C (2°F) to a maximum of 13°C (56°F) and an average of 1°C (34°F). The month experiences higher precipitation, totaling 155 mm (6.1 in) over 12 days, coupled with high humidity at 84%. In contrast, June brings a much milder climate, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 20°C (69°F) and an average of 13°C (56°F). Rainfall is lower in June, accumulating to 87 mm (3.4 in) over just 9 days, and the humidity decreases to 74%. For more detailed information, check out Deer Isle weather in June.

In December, the weather is significantly colder, with temperatures ranging from a bitter minimum of -17°C (2°F) to a maximum of 13°C (56°F), averaging around 1°C (34°F). This month sees substantial precipitation of 155 mm (6.1 in) spread over 12 days, coupled with high humidity levels of 84%. In contrast, July brings a much milder climate, with temperatures fluctuating between a minimum of 12°C (54°F) and a maximum of 22°C (72°F), averaging 16°C (62°F). Precipitation in July is lighter at 92 mm (3.6 in) over 10 days and with a lower humidity of 74%. For more details on July weather, visit Deer Isle weather in July.

December and August present striking contrasts in weather. In December, temperatures can plummet to a minimum of -17°C (2°F), with an average of 1°C (34°F) and a maximum of 13°C (56°F). This month often experiences significant precipitation, averaging 155 mm (6.1 in) over 12 days, accompanied by high humidity levels at 84%. In contrast, August offers a much milder climate, with temperatures ranging from a minimum of 13°C (57°F) to a pleasant average of 18°C (64°F), peaking at 23°C (73°F). Precipitation is lower, averaging 86 mm (3.4 in) over just 8 days, and the humidity is notably more comfortable at 74%. For a more detailed look at what to expect, you can check Deer Isle weather in August.

In comparing the weather of December and September, it's clear that December is significantly colder with temperatures ranging from a minimum of -17°C (2°F) to a maximum of 13°C (56°F), resulting in an average of 1°C (34°F). In contrast, September boasts milder temperatures, with lows around 9°C (48°F) and highs reaching up to 22°C (72°F), giving an average of 16°C (60°F). Precipitation levels are higher in December at 155 mm (6.1 in) over 12 days, compared to September's 102 mm (4.0 in) over just 8 days. Additionally, December has a higher humidity level at 84%, while September's humidity is slightly lower at 77%. This stark contrast highlights how December embodies the chill of winter, while September retains the warmth of late summer. For more details, you can check Deer Isle weather in September.

In comparing the weather of December and October, it's clear that December is significantly colder, with minimum temperatures plummeting to -17°C (2°F) and an average temperature around 1°C (34°F), while October enjoys much milder conditions with a minimum of 2°C (35°F) and an average of 12°C (54°F). Precipitation levels are somewhat similar, with December recording 155 mm (6.1 in) over 12 days compared to October's 145 mm (5.7 in) during the same number of days. Additionally, December's humidity is slightly higher at 84%, compared to October's 82%, contributing to the overall chill of Winter's arrival. For more details on October's climate, you can check Deer Isle weather in October.

In comparison to November, December experiences colder temperatures, with a minimum of -17°C (2°F) and an average of 1°C (34°F), while November generally sees milder conditions, with a minimum of -11°C (13°F) and an average of 6°C (43°F). Both months have similar levels of precipitation, with December at 155 mm (6.1 in) and November at 138 mm (5.4 in), and both span about 12 rainy days. However, December's humidity is slightly lower at 84%, compared to November's 85%, contributing to a different overall feel in the air. For more insights on the weather in November, you can check Deer Isle weather in November.

Compare Deer Isle's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Deer Isle

As December sets in, Deer Isle transforms into a winter wonderland, showcasing a notable shift in weather that differs significantly from other months. With average temperatures hovering around the freezing point, the island experiences its coldest days, where lows can plummet to -17°C. The air is consistently humid at 84%, making the chill feel even more biting. Despite occasional precipitation, with 155 mm spread over 12 days, this month’s beauty lies in its crisp, serene landscapes rather than the vibrant activity of earlier seasons. As you plan your visit, explore more about the nuances of the local climate at Deer Isle Climate.