December Weather in Boothbay Harbor, United States

Last updated: February 24, 2025

In Boothbay Harbor, United States, December brings a crisp and dynamic winter climate. Temperatures typically range from a maximum of 14°C (57°F) to a minimum of -16°C (3°F), with an average of 1°C (35°F) that keeps residents and visitors bundled up. The month sees precipitation totals reaching 137 mm (5.4 in) over 11 days, contributing to the region's 81% humidity. This blend of chill and moisture creates a picturesque winter setting, perfect for cozy gatherings and enjoying the seasonal charm of this coastal treasure.

December Temperature in Boothbay Harbor

In Boothbay Harbor, December ushers in the chill of winter, with temperatures dipping notably during this month. The average temperature hovers around 1°C (35°F), reflecting a colder climate as the region transitions from fall. Minimum temperatures can plunge to a brisk -16°C (3°F), indicating the depth of winter's reach, while daytime highs can still reach a more moderate 14°C (57°F). This trend of cooler temperatures signals the onset of the holiday season, making it a picturesque time for visitors enchanted by the charm of a coastal winter. As December progresses, the contrast between the frosty nights and relatively milder days creates a uniquely inviting atmosphere, perfect for cozy gatherings and stunning winter vistas.

December Weather in Boothbay Harbor: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Boothbay Harbor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec303134425059666762544335
Data source: Temperature data for Boothbay Harbor 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 Boothbay Harbor

December in Boothbay Harbor ushers in a notable shift in precipitation patterns, marking the transition into winter. With an average of 137 mm (5.4 in) of rain over 11 days, December experiences a steady level of moisture, slightly lower than the preceding month of November, which recorded 122 mm (4.8 in) on the same number of days. This month’s rainfall places it in the upper echelon of seasonal precipitation, suggesting a reliance on consistent, often heavy showers to close out the year. Throughout the months leading up to December, a trend of fluctuating precipitation amounts is evident, with the wettest being October at 150 mm (5.9 in). Despite these variations, December maintains a robust presence of moisture, aligning with the colder climate and setting the stage for a snowy winter ahead.

December Precipitation Trends in Boothbay Harbor

The chart displays monthly precipitation patterns in Boothbay Harbor, 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.
JanFebMarAprMayJunJulAugSepOctNovDec96988513982711007181150122137
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Boothbay Harbor

In Boothbay Harbor, December brings a noticeable drop in humidity compared to the earlier months, settling at around 81%. This slight decrease reflects a mid-winter trend, as humidity levels typically hover around the mid-80s during the late fall and early summer months. While the year begins with January and February showcasing the highest humidity at 85% and 86% respectively, spring and early summer experience a gradual decline, with April and May dipping to 79%. Interestingly, humidity begins to rise again in late summer and early fall before tapering off slightly as winter sets in. Thus, a cyclical pattern emerges, demonstrating how the coastal climate of Boothbay Harbor influences humidity levels throughout the year.

December Average Humidity in Boothbay Harbor

This chart illustrates the average monthly humidity levels in Boothbay Harbor, 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.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%84%79%79%86%85%83%80%77%80%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Boothbay Harbor

In December, Boothbay Harbor experiences a low UV Index of 2, indicating minimal sun exposure risks. This is similar to January, where the index is low, with a safe burn time of 45 minutes. As the year progresses, the UV Index rises significantly during the spring and summer months, peaking at 10 in June, which necessitates greater caution with a burn time of just 15 minutes. However, as the year wraps up, December's more forgiving UV levels offer a gentle reminder of the seasonal shift, allowing for longer sun exposure without immediate risk. For those interested in tracking UV variations throughout the year, you can find more information at Boothbay Harbor UV Index.

Maximum UV Index Levels in Boothbay Harbor for December

The chart shows the monthly maximum UV Index (UVI) for Boothbay Harbor 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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: Boothbay Harbor 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 Boothbay Harbor

As December settles over Boothbay Harbor, the town basks in a cozy 174 hours of sunshine, a soft contrast to the vibrant peaks of the summer months that see upwards of 341 hours in August. The trend of diminishing daylight kicks off in the fall, with each month experiencing a gradual decline, though December holds a respectable amount of sun compared to its frigid predecessor, November, which offers 193 hours. Following a sunnier stretch from March to July, where the days lengthen and brightness reigns, December invites a reflective mood, showcasing the charm of winter light. As the year draws to a close, the harbor's tranquil waters and scenic vistas remain beautifully illuminated, inviting locals and visitors alike to embrace the serenity that only the winter sun can offer.

Monthly Sunshine Duration in Boothbay Harbor: December Highlighted

The December sunshine duration represents the total number of hours Boothbay Harbor 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.
JanFebMarAprMayJunJulAugSepOctNovDec145h187h261h250h302h334h337h341h287h229h193h174h
Data source: Boothbay Harbor December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Boothbay Harbor During December

December in Boothbay Harbor presents a subdued likelihood of sunshine, with only a 32% chance of clear skies. This marks a notable decline from November's relatively brighter 54%, indicating the onset of winter's gray overcast. Throughout the year, the region experiences fluctuations, peaking in March at 60%, then tapering off in the summer months. Notably, July sees the lowest chance of sun at 29%, suggesting that while summer brings warmth, it doesn't guarantee sunny days. As we transition into winter, December's figures reflect the seasonal shift, emphasizing the need for cozy indoor reflections rather than sun-soaked afternoons.

Percentage of Sunny Days in December in Boothbay Harbor

The chart illustrates the percentage of sunny days in Boothbay Harbor 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 Boothbay Harbor experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%34%60%37%38%39%29%33%44%38%54%32%
Data source: Boothbay Harbor December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Boothbay Harbor in December

As the year wraps up in Boothbay Harbor, December brings a notable decrease in daylight, with only 8 hours of sun gracing the skies. This reduction marks a continuation of the seasonal trend observed since November, where the days shorten significantly, dropping from 9 hours to an even more abbreviated daylight duration. The transition from the bright, long days of summer, which enjoyed up to 15 hours in June and July, to the darker winter months highlights the rhythm of the seasons. As daylight lingers later into spring, increasing to 14 hours in May, the gradual ebb toward winter reminds us of nature's cyclical cadence, ultimately leading to brighter days ahead as we welcome the new year.

Average Daylight Hours in Boothbay Harbor for December

The chart illustrates the variation in daylight duration in Boothbay Harbor throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 19m10h 29m11h 57m13h 28m14h 45m15h 23m15h 2m13h 54m12h 27m10h 56m9h 37m8h 57m
Data source: Boothbay Harbor daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Boothbay Harbor

As December sweeps into Boothbay Harbor, the wind begins to pick up, culminating in an average speed of 6.7 m/s (15 mph)—a notable increase from the preceding months. This brisk December breeze stands out against the backdrop of a generally declining trend seen since the summer, where July and August recorded their calmest winds at only 4.5 m/s (10 mph) and 4.3 m/s (10 mph) respectively. The transition into the colder months heralds a return of stronger winds, with December's conditions echoing the early winter vigor reminiscent of January's 6.6 m/s (15 mph). As the year draws to a close, the winds of Boothbay Harbor remind us of the dynamic nature of coastal weather, inviting both solace and a touch of adventure for those brave enough to face the elements.

Average December Wind Speed in Boothbay Harbor

The chart displays monthly wind speed patterns in Boothbay Harbor, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6.66.47.15.85.25.94.54.35.25.56.16.7 m/s
Data source: Boothbay Harbor December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Boothbay Harbor Compares to Other Months

The weather in Boothbay Harbor 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 Boothbay Harbor and find detailed weather information for every month.

December and January in Boothbay Harbor exhibit notable differences in weather patterns. In December, temperatures range from a minimum of -16°C (3°F) to a maximum of 14°C (57°F), with an average of around 1°C (35°F) and a relatively high precipitation total of 137 mm (5.4 in) over 11 days. The humidity level stands at 81%, contributing to the winter chill. In contrast, January sees slightly colder temperatures, with a minimum of -17°C (2°F) and an average of -1°C (31°F). The maximum temperature drops to 11°C (52°F), and January experiences less precipitation at 96 mm (3.8 in) over 9 days, while humidity increases slightly to 85%. For a more detailed overview, please check Boothbay Harbor weather in January.

In December, weather conditions feature a wider temperature range, with lows reaching -16°C (3°F) and highs averaging around 14°C (57°F). Conversely, February exhibits slightly milder temperatures, with minimums of -14°C (7°F) and a maximum of 11°C (53°F). Precipitation in December is higher at 137 mm (5.4 in) over 11 days compared to 98 mm (3.8 in) over 10 days in February. Additionally, February tends to have increased humidity at 86%, compared to 81% in December, indicating a chillier, yet relatively damp environment. For more specific details about February weather, you can check out Boothbay Harbor weather in February.

In December, temperatures can be quite chilly, with a minimum of -16°C (3°F) and an average around 1°C (35°F), peaking at a maximum of 14°C (57°F). This month also sees significant precipitation, totaling 137 mm (5.4 in) over approximately 11 days, contributing to a humidity level of 81%. March, on the other hand, offers slightly milder weather, as the minimum temperature only drops to -13°C (9°F) while also averaging 1°C (35°F), and reaching a maximum of 12°C (53°F). Precipitation decreases to 85 mm (3.3 in) across 9 days, with a humidity level of 84%. For more detailed weather insights, you can check Boothbay Harbor weather in March.

In December, temperatures can plummet to a minimum of -16°C (3°F), with an average of 1°C (35°F) and a maximum of 14°C (57°F), creating a chilly atmosphere characterized by high humidity at 81%. The month sees significant precipitation, totaling 137 mm (5.4 in) over approximately 11 days. In contrast, April offers a milder climate, with minimum temperatures around -2°C (29°F), an average of 6°C (43°F), and maximums reaching 15°C (60°F). While precipitation is slightly higher at 139 mm (5.5 in) and occurs over 13 days, the humidity remains lower at 79%. For more details about the weather during this month, you can check out Boothbay Harbor weather in April.

December and May present strikingly different weather patterns. In December, temperatures can plunge to a minimum of -16°C (3°F), with an average of 1°C (35°F) and a maximum of 14°C (57°F). This month also sees a fair amount of precipitation at 137 mm (5.4 in) over approximately 11 days, accompanied by high humidity levels at 81%. In contrast, May features much milder conditions, with a minimum temperature of 2°C (37°F), an average of 10°C (50°F), and a maximum of 19°C (66°F). Precipitation decreases to 82 mm (3.2 in) across about 10 days, and humidity hovers just slightly lower at 79%. For a detailed look at May weather, check out Boothbay Harbor weather in May.

December and June present strikingly different weather patterns. In December, temperatures range from a chilly -16°C (3°F) to a maximum of 14°C (57°F), with an average temperature of around 1°C (35°F). The month is characterized by significant precipitation, totaling 137 mm (5.4 in) and typically occurring over 11 days, while humidity levels hover at 81%. In contrast, June offers a milder climate with temperatures ranging from a minimum of 9°C (49°F) to a pleasant maximum of 21°C (71°F), averaging 15°C (59°F). Precipitation decreases to 71 mm (2.8 in) over just 8 days, although humidity is slightly higher at 86%. For a closer look at what to expect, check out Boothbay Harbor weather in June.

When comparing December and July weather, notable contrasts emerge. December can be quite harsh, with temperatures ranging from a minimum of -16°C (3°F) to a maximum of 14°C (57°F), and an average temperature of around 1°C (35°F). Additionally, it experiences higher precipitation at 137 mm (5.4 in) over approximately 11 days, along with a humidity level of 81%. In contrast, July offers a much milder climate, with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 25°C (78°F), and an average of 19°C (66°F). Precipitation in July is lower at 100 mm (3.9 in) across about 10 days, while humidity slightly increases to 85%. For more detailed information on July weather, check out Boothbay Harbor weather in July.

When comparing the weather in December and August, notable differences emerge. December typically experiences much colder temperatures, with a minimum of -16°C (3°F) and an average of 1°C (35°F), while August enjoys milder conditions, featuring a minimum of 15°C (59°F) and an average temperature of 20°C (67°F). Additionally, December is characterized by higher precipitation levels, receiving 137 mm (5.4 in) over 11 days, compared to August’s 71 mm (2.8 in) across 8 days. Humidity levels are quite similar, with December at 81% and August at 83%, adding to the distinct seasonal contrasts. For more insights on August weather, you can check Boothbay Harbor weather in August.

When comparing the weather in December to that in September, there are notable differences in temperature and precipitation. December experiences significantly colder temperatures, with a minimum of -16°C (3°F) and an average of just 1°C (35°F), while September is much milder, featuring a minimum of 9°C (48°F) and an average of 17°C (62°F). Additionally, December sees higher precipitation levels, totaling 137 mm (5.4 in) over 11 days, compared to September's 81 mm (3.2 in) over 8 days. The humidity levels are fairly similar, with December at 81% and September at 80%. For more specific details about Boothbay Harbor's September weather, you can visit Boothbay Harbor weather in September.

In December, temperatures drop significantly, with a minimum of -16°C (3°F) and an average of just 1°C (35°F), making it considerably colder than October, where temperatures range from a minimum of 2°C (36°F) to a more mild average of 12°C (55°F). While December experiences less total precipitation at 137 mm (5.4 in) over 11 days, October has a higher precipitation level of 150 mm (5.9 in) spread across 12 days. Humidity levels are also slightly lower in October at 77%, compared to December’s 81%. For a detailed look at how the weather in October affects daily life, you can explore Boothbay Harbor weather in October.

December weather tends to be colder than November, with temperatures dropping from a minimum of -10°C (14°F) in November to -16°C (3°F) in December. While the average temperature decreases from 6°C (44°F) in November to around 1°C (35°F) in December, the maximum temperature also sees a decline, moving from 17°C (63°F) to 14°C (57°F). Both months experience a similar number of precipitation days (11), but December has slightly higher precipitation levels at 137 mm (5.4 in) compared to November's 122 mm (4.8 in). Despite a marginal increase in humidity from 80% in November to 81% in December, the overall feel is much chillier in the latter month. For more details, you can visit Boothbay Harbor weather in November.

Compare Boothbay Harbor's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Boothbay Harbor

As December settles in, Boothbay Harbor transforms, embracing the chill of winter with temperatures considerably lower than the rest of the year. While the warmth fades, the coastal beauty remains enchanting, highlighted by increased humidity and frequent precipitation that nurtures the landscape. Overall, this month is characterized by a crisp atmosphere, fostering a cozy vibe perfect for holiday festivities. Whether you're exploring the stunning scenery or enjoying local charm, the unique December weather offers a refreshing contrast to milder months. For more detailed insights, check out Boothbay Harbor Climate.